root / hw / vfio_pci.c @ d9f0e638
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/*
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* vfio based device assignment support
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*
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* Copyright Red Hat, Inc. 2012
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*
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* Authors:
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* Alex Williamson <alex.williamson@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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* Based on qemu-kvm device-assignment:
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* Adapted for KVM by Qumranet.
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* Copyright (c) 2007, Neocleus, Alex Novik (alex@neocleus.com)
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* Copyright (c) 2007, Neocleus, Guy Zana (guy@neocleus.com)
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* Copyright (C) 2008, Qumranet, Amit Shah (amit.shah@qumranet.com)
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* Copyright (C) 2008, Red Hat, Amit Shah (amit.shah@redhat.com)
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* Copyright (C) 2008, IBM, Muli Ben-Yehuda (muli@il.ibm.com)
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*/
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#include <dirent.h> |
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#include <unistd.h> |
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#include <sys/ioctl.h> |
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#include <sys/mman.h> |
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#include <sys/stat.h> |
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#include <sys/types.h> |
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#include <linux/vfio.h> |
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|
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#include "config.h" |
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#include "event_notifier.h" |
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#include "exec-memory.h" |
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#include "kvm.h" |
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#include "memory.h" |
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#include "msi.h" |
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#include "msix.h" |
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#include "pci.h" |
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#include "qemu-common.h" |
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#include "qemu-error.h" |
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#include "qemu-queue.h" |
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#include "range.h" |
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|
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/* #define DEBUG_VFIO */
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#ifdef DEBUG_VFIO
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#define DPRINTF(fmt, ...) \
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do { fprintf(stderr, "vfio: " fmt, ## __VA_ARGS__); } while (0) |
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#else
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#define DPRINTF(fmt, ...) \
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do { } while (0) |
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#endif
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typedef struct VFIOBAR { |
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off_t fd_offset; /* offset of BAR within device fd */
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int fd; /* device fd, allows us to pass VFIOBAR as opaque data */ |
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MemoryRegion mem; /* slow, read/write access */
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MemoryRegion mmap_mem; /* direct mapped access */
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void *mmap;
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size_t size; |
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uint32_t flags; /* VFIO region flags (rd/wr/mmap) */
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uint8_t nr; /* cache the BAR number for debug */
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} VFIOBAR; |
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|
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typedef struct VFIOINTx { |
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bool pending; /* interrupt pending */ |
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bool kvm_accel; /* set when QEMU bypass through KVM enabled */ |
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uint8_t pin; /* which pin to pull for qemu_set_irq */
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EventNotifier interrupt; /* eventfd triggered on interrupt */
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EventNotifier unmask; /* eventfd for unmask on QEMU bypass */
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PCIINTxRoute route; /* routing info for QEMU bypass */
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uint32_t mmap_timeout; /* delay to re-enable mmaps after interrupt */
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QEMUTimer *mmap_timer; /* enable mmaps after periods w/o interrupts */
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} VFIOINTx; |
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struct VFIODevice;
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typedef struct VFIOMSIVector { |
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EventNotifier interrupt; /* eventfd triggered on interrupt */
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struct VFIODevice *vdev; /* back pointer to device */ |
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int virq; /* KVM irqchip route for QEMU bypass */ |
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bool use;
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} VFIOMSIVector; |
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|
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enum {
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VFIO_INT_NONE = 0,
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VFIO_INT_INTx = 1,
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VFIO_INT_MSI = 2,
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VFIO_INT_MSIX = 3,
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}; |
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struct VFIOGroup;
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typedef struct VFIOContainer { |
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int fd; /* /dev/vfio/vfio, empowered by the attached groups */ |
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struct {
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/* enable abstraction to support various iommu backends */
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union {
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MemoryListener listener; /* Used by type1 iommu */
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}; |
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void (*release)(struct VFIOContainer *); |
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} iommu_data; |
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QLIST_HEAD(, VFIOGroup) group_list; |
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QLIST_ENTRY(VFIOContainer) next; |
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} VFIOContainer; |
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|
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/* Cache of MSI-X setup plus extra mmap and memory region for split BAR map */
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typedef struct VFIOMSIXInfo { |
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uint8_t table_bar; |
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uint8_t pba_bar; |
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uint16_t entries; |
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uint32_t table_offset; |
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uint32_t pba_offset; |
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MemoryRegion mmap_mem; |
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void *mmap;
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} VFIOMSIXInfo; |
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typedef struct VFIODevice { |
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PCIDevice pdev; |
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int fd;
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VFIOINTx intx; |
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unsigned int config_size; |
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off_t config_offset; /* Offset of config space region within device fd */
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unsigned int rom_size; |
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off_t rom_offset; /* Offset of ROM region within device fd */
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int msi_cap_size;
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VFIOMSIVector *msi_vectors; |
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VFIOMSIXInfo *msix; |
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int nr_vectors; /* Number of MSI/MSIX vectors currently in use */ |
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int interrupt; /* Current interrupt type */ |
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VFIOBAR bars[PCI_NUM_REGIONS - 1]; /* No ROM */ |
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PCIHostDeviceAddress host; |
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QLIST_ENTRY(VFIODevice) next; |
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struct VFIOGroup *group;
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bool reset_works;
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} VFIODevice; |
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typedef struct VFIOGroup { |
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int fd;
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int groupid;
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VFIOContainer *container; |
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QLIST_HEAD(, VFIODevice) device_list; |
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QLIST_ENTRY(VFIOGroup) next; |
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QLIST_ENTRY(VFIOGroup) container_next; |
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} VFIOGroup; |
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#define MSIX_CAP_LENGTH 12 |
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static QLIST_HEAD(, VFIOContainer)
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container_list = QLIST_HEAD_INITIALIZER(container_list); |
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static QLIST_HEAD(, VFIOGroup)
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group_list = QLIST_HEAD_INITIALIZER(group_list); |
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static void vfio_disable_interrupts(VFIODevice *vdev); |
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static uint32_t vfio_pci_read_config(PCIDevice *pdev, uint32_t addr, int len); |
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static void vfio_mmap_set_enabled(VFIODevice *vdev, bool enabled); |
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|
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/*
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* Common VFIO interrupt disable
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*/
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static void vfio_disable_irqindex(VFIODevice *vdev, int index) |
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{
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struct vfio_irq_set irq_set = {
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.argsz = sizeof(irq_set),
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.flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER, |
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.index = index, |
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.start = 0,
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.count = 0,
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}; |
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ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, &irq_set); |
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} |
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|
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/*
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* INTx
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*/
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static void vfio_unmask_intx(VFIODevice *vdev) |
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{
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struct vfio_irq_set irq_set = {
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.argsz = sizeof(irq_set),
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.flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK, |
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.index = VFIO_PCI_INTX_IRQ_INDEX, |
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.start = 0,
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.count = 1,
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}; |
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ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, &irq_set); |
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} |
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/*
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* Disabling BAR mmaping can be slow, but toggling it around INTx can
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* also be a huge overhead. We try to get the best of both worlds by
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* waiting until an interrupt to disable mmaps (subsequent transitions
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* to the same state are effectively no overhead). If the interrupt has
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* been serviced and the time gap is long enough, we re-enable mmaps for
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* performance. This works well for things like graphics cards, which
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* may not use their interrupt at all and are penalized to an unusable
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* level by read/write BAR traps. Other devices, like NICs, have more
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* regular interrupts and see much better latency by staying in non-mmap
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* mode. We therefore set the default mmap_timeout such that a ping
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* is just enough to keep the mmap disabled. Users can experiment with
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* other options with the x-intx-mmap-timeout-ms parameter (a value of
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* zero disables the timer).
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*/
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static void vfio_intx_mmap_enable(void *opaque) |
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{
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VFIODevice *vdev = opaque; |
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if (vdev->intx.pending) {
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qemu_mod_timer(vdev->intx.mmap_timer, |
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qemu_get_clock_ms(vm_clock) + vdev->intx.mmap_timeout); |
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return;
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} |
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vfio_mmap_set_enabled(vdev, true);
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} |
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static void vfio_intx_interrupt(void *opaque) |
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{
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VFIODevice *vdev = opaque; |
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if (!event_notifier_test_and_clear(&vdev->intx.interrupt)) {
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return;
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} |
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DPRINTF("%s(%04x:%02x:%02x.%x) Pin %c\n", __func__, vdev->host.domain,
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vdev->host.bus, vdev->host.slot, vdev->host.function, |
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'A' + vdev->intx.pin);
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vdev->intx.pending = true;
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qemu_set_irq(vdev->pdev.irq[vdev->intx.pin], 1);
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vfio_mmap_set_enabled(vdev, false);
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if (vdev->intx.mmap_timeout) {
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qemu_mod_timer(vdev->intx.mmap_timer, |
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qemu_get_clock_ms(vm_clock) + vdev->intx.mmap_timeout); |
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} |
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} |
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static void vfio_eoi(VFIODevice *vdev) |
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{
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if (!vdev->intx.pending) {
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return;
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} |
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DPRINTF("%s(%04x:%02x:%02x.%x) EOI\n", __func__, vdev->host.domain,
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vdev->host.bus, vdev->host.slot, vdev->host.function); |
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vdev->intx.pending = false;
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qemu_set_irq(vdev->pdev.irq[vdev->intx.pin], 0);
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vfio_unmask_intx(vdev); |
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} |
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static int vfio_enable_intx(VFIODevice *vdev) |
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{
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uint8_t pin = vfio_pci_read_config(&vdev->pdev, PCI_INTERRUPT_PIN, 1);
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int ret, argsz;
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struct vfio_irq_set *irq_set;
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int32_t *pfd; |
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if (!pin) {
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return 0; |
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} |
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vfio_disable_interrupts(vdev); |
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vdev->intx.pin = pin - 1; /* Pin A (1) -> irq[0] */ |
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ret = event_notifier_init(&vdev->intx.interrupt, 0);
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if (ret) {
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error_report("vfio: Error: event_notifier_init failed\n");
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return ret;
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} |
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argsz = sizeof(*irq_set) + sizeof(*pfd); |
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irq_set = g_malloc0(argsz); |
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irq_set->argsz = argsz; |
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irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER; |
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irq_set->index = VFIO_PCI_INTX_IRQ_INDEX; |
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irq_set->start = 0;
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irq_set->count = 1;
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pfd = (int32_t *)&irq_set->data; |
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*pfd = event_notifier_get_fd(&vdev->intx.interrupt); |
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qemu_set_fd_handler(*pfd, vfio_intx_interrupt, NULL, vdev);
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ret = ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, irq_set); |
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g_free(irq_set); |
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if (ret) {
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error_report("vfio: Error: Failed to setup INTx fd: %m\n");
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qemu_set_fd_handler(*pfd, NULL, NULL, vdev); |
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event_notifier_cleanup(&vdev->intx.interrupt); |
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return -errno;
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} |
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vdev->interrupt = VFIO_INT_INTx; |
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DPRINTF("%s(%04x:%02x:%02x.%x)\n", __func__, vdev->host.domain,
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vdev->host.bus, vdev->host.slot, vdev->host.function); |
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return 0; |
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} |
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|
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static void vfio_disable_intx(VFIODevice *vdev) |
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{
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int fd;
|
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|
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qemu_del_timer(vdev->intx.mmap_timer); |
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vfio_disable_irqindex(vdev, VFIO_PCI_INTX_IRQ_INDEX); |
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vdev->intx.pending = false;
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qemu_set_irq(vdev->pdev.irq[vdev->intx.pin], 0);
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vfio_mmap_set_enabled(vdev, true);
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|
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fd = event_notifier_get_fd(&vdev->intx.interrupt); |
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qemu_set_fd_handler(fd, NULL, NULL, vdev); |
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event_notifier_cleanup(&vdev->intx.interrupt); |
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|
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vdev->interrupt = VFIO_INT_NONE; |
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|
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DPRINTF("%s(%04x:%02x:%02x.%x)\n", __func__, vdev->host.domain,
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vdev->host.bus, vdev->host.slot, vdev->host.function); |
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} |
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|
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/*
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* MSI/X
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*/
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static void vfio_msi_interrupt(void *opaque) |
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{
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VFIOMSIVector *vector = opaque; |
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VFIODevice *vdev = vector->vdev; |
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int nr = vector - vdev->msi_vectors;
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|
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if (!event_notifier_test_and_clear(&vector->interrupt)) {
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return;
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} |
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|
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DPRINTF("%s(%04x:%02x:%02x.%x) vector %d\n", __func__,
|
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vdev->host.domain, vdev->host.bus, vdev->host.slot, |
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vdev->host.function, nr); |
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|
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if (vdev->interrupt == VFIO_INT_MSIX) {
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msix_notify(&vdev->pdev, nr); |
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} else if (vdev->interrupt == VFIO_INT_MSI) { |
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msi_notify(&vdev->pdev, nr); |
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} else {
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error_report("vfio: MSI interrupt receieved, but not enabled?\n");
|
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} |
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} |
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|
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static int vfio_enable_vectors(VFIODevice *vdev, bool msix) |
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{
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struct vfio_irq_set *irq_set;
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int ret = 0, i, argsz; |
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int32_t *fds; |
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|
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argsz = sizeof(*irq_set) + (vdev->nr_vectors * sizeof(*fds)); |
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|
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irq_set = g_malloc0(argsz); |
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irq_set->argsz = argsz; |
| 357 |
irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER; |
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irq_set->index = msix ? VFIO_PCI_MSIX_IRQ_INDEX : VFIO_PCI_MSI_IRQ_INDEX; |
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irq_set->start = 0;
|
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irq_set->count = vdev->nr_vectors; |
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fds = (int32_t *)&irq_set->data; |
| 362 |
|
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for (i = 0; i < vdev->nr_vectors; i++) { |
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if (!vdev->msi_vectors[i].use) {
|
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fds[i] = -1;
|
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continue;
|
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} |
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|
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fds[i] = event_notifier_get_fd(&vdev->msi_vectors[i].interrupt); |
| 370 |
} |
| 371 |
|
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ret = ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, irq_set); |
| 373 |
|
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g_free(irq_set); |
| 375 |
|
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return ret;
|
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} |
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|
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static int vfio_msix_vector_use(PCIDevice *pdev, |
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unsigned int nr, MSIMessage msg) |
| 381 |
{
|
| 382 |
VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev); |
| 383 |
VFIOMSIVector *vector; |
| 384 |
int ret;
|
| 385 |
|
| 386 |
DPRINTF("%s(%04x:%02x:%02x.%x) vector %d used\n", __func__,
|
| 387 |
vdev->host.domain, vdev->host.bus, vdev->host.slot, |
| 388 |
vdev->host.function, nr); |
| 389 |
|
| 390 |
vector = &vdev->msi_vectors[nr]; |
| 391 |
vector->vdev = vdev; |
| 392 |
vector->use = true;
|
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|
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msix_vector_use(pdev, nr); |
| 395 |
|
| 396 |
if (event_notifier_init(&vector->interrupt, 0)) { |
| 397 |
error_report("vfio: Error: event_notifier_init failed\n");
|
| 398 |
} |
| 399 |
|
| 400 |
/*
|
| 401 |
* Attempt to enable route through KVM irqchip,
|
| 402 |
* default to userspace handling if unavailable.
|
| 403 |
*/
|
| 404 |
vector->virq = kvm_irqchip_add_msi_route(kvm_state, msg); |
| 405 |
if (vector->virq < 0 || |
| 406 |
kvm_irqchip_add_irqfd_notifier(kvm_state, &vector->interrupt, |
| 407 |
vector->virq) < 0) {
|
| 408 |
if (vector->virq >= 0) { |
| 409 |
kvm_irqchip_release_virq(kvm_state, vector->virq); |
| 410 |
vector->virq = -1;
|
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} |
| 412 |
qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt), |
| 413 |
vfio_msi_interrupt, NULL, vector);
|
| 414 |
} |
| 415 |
|
| 416 |
/*
|
| 417 |
* We don't want to have the host allocate all possible MSI vectors
|
| 418 |
* for a device if they're not in use, so we shutdown and incrementally
|
| 419 |
* increase them as needed.
|
| 420 |
*/
|
| 421 |
if (vdev->nr_vectors < nr + 1) { |
| 422 |
vfio_disable_irqindex(vdev, VFIO_PCI_MSIX_IRQ_INDEX); |
| 423 |
vdev->nr_vectors = nr + 1;
|
| 424 |
ret = vfio_enable_vectors(vdev, true);
|
| 425 |
if (ret) {
|
| 426 |
error_report("vfio: failed to enable vectors, %d\n", ret);
|
| 427 |
} |
| 428 |
} else {
|
| 429 |
int argsz;
|
| 430 |
struct vfio_irq_set *irq_set;
|
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int32_t *pfd; |
| 432 |
|
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argsz = sizeof(*irq_set) + sizeof(*pfd); |
| 434 |
|
| 435 |
irq_set = g_malloc0(argsz); |
| 436 |
irq_set->argsz = argsz; |
| 437 |
irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | |
| 438 |
VFIO_IRQ_SET_ACTION_TRIGGER; |
| 439 |
irq_set->index = VFIO_PCI_MSIX_IRQ_INDEX; |
| 440 |
irq_set->start = nr; |
| 441 |
irq_set->count = 1;
|
| 442 |
pfd = (int32_t *)&irq_set->data; |
| 443 |
|
| 444 |
*pfd = event_notifier_get_fd(&vector->interrupt); |
| 445 |
|
| 446 |
ret = ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, irq_set); |
| 447 |
g_free(irq_set); |
| 448 |
if (ret) {
|
| 449 |
error_report("vfio: failed to modify vector, %d\n", ret);
|
| 450 |
} |
| 451 |
} |
| 452 |
|
| 453 |
return 0; |
| 454 |
} |
| 455 |
|
| 456 |
static void vfio_msix_vector_release(PCIDevice *pdev, unsigned int nr) |
| 457 |
{
|
| 458 |
VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev); |
| 459 |
VFIOMSIVector *vector = &vdev->msi_vectors[nr]; |
| 460 |
int argsz;
|
| 461 |
struct vfio_irq_set *irq_set;
|
| 462 |
int32_t *pfd; |
| 463 |
|
| 464 |
DPRINTF("%s(%04x:%02x:%02x.%x) vector %d released\n", __func__,
|
| 465 |
vdev->host.domain, vdev->host.bus, vdev->host.slot, |
| 466 |
vdev->host.function, nr); |
| 467 |
|
| 468 |
/*
|
| 469 |
* XXX What's the right thing to do here? This turns off the interrupt
|
| 470 |
* completely, but do we really just want to switch the interrupt to
|
| 471 |
* bouncing through userspace and let msix.c drop it? Not sure.
|
| 472 |
*/
|
| 473 |
msix_vector_unuse(pdev, nr); |
| 474 |
|
| 475 |
argsz = sizeof(*irq_set) + sizeof(*pfd); |
| 476 |
|
| 477 |
irq_set = g_malloc0(argsz); |
| 478 |
irq_set->argsz = argsz; |
| 479 |
irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | |
| 480 |
VFIO_IRQ_SET_ACTION_TRIGGER; |
| 481 |
irq_set->index = VFIO_PCI_MSIX_IRQ_INDEX; |
| 482 |
irq_set->start = nr; |
| 483 |
irq_set->count = 1;
|
| 484 |
pfd = (int32_t *)&irq_set->data; |
| 485 |
|
| 486 |
*pfd = -1;
|
| 487 |
|
| 488 |
ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, irq_set); |
| 489 |
|
| 490 |
g_free(irq_set); |
| 491 |
|
| 492 |
if (vector->virq < 0) { |
| 493 |
qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt), |
| 494 |
NULL, NULL, NULL); |
| 495 |
} else {
|
| 496 |
kvm_irqchip_remove_irqfd_notifier(kvm_state, &vector->interrupt, |
| 497 |
vector->virq); |
| 498 |
kvm_irqchip_release_virq(kvm_state, vector->virq); |
| 499 |
vector->virq = -1;
|
| 500 |
} |
| 501 |
|
| 502 |
event_notifier_cleanup(&vector->interrupt); |
| 503 |
vector->use = false;
|
| 504 |
} |
| 505 |
|
| 506 |
/* TODO This should move to msi.c */
|
| 507 |
static MSIMessage msi_get_msg(PCIDevice *pdev, unsigned int vector) |
| 508 |
{
|
| 509 |
uint16_t flags = pci_get_word(pdev->config + pdev->msi_cap + PCI_MSI_FLAGS); |
| 510 |
bool msi64bit = flags & PCI_MSI_FLAGS_64BIT;
|
| 511 |
MSIMessage msg; |
| 512 |
|
| 513 |
if (msi64bit) {
|
| 514 |
msg.address = pci_get_quad(pdev->config + |
| 515 |
pdev->msi_cap + PCI_MSI_ADDRESS_LO); |
| 516 |
} else {
|
| 517 |
msg.address = pci_get_long(pdev->config + |
| 518 |
pdev->msi_cap + PCI_MSI_ADDRESS_LO); |
| 519 |
} |
| 520 |
|
| 521 |
msg.data = pci_get_word(pdev->config + pdev->msi_cap + |
| 522 |
(msi64bit ? PCI_MSI_DATA_64 : PCI_MSI_DATA_32)); |
| 523 |
msg.data += vector; |
| 524 |
|
| 525 |
return msg;
|
| 526 |
} |
| 527 |
|
| 528 |
static void vfio_enable_msix(VFIODevice *vdev) |
| 529 |
{
|
| 530 |
vfio_disable_interrupts(vdev); |
| 531 |
|
| 532 |
vdev->msi_vectors = g_malloc0(vdev->msix->entries * sizeof(VFIOMSIVector));
|
| 533 |
|
| 534 |
vdev->interrupt = VFIO_INT_MSIX; |
| 535 |
|
| 536 |
if (msix_set_vector_notifiers(&vdev->pdev, vfio_msix_vector_use,
|
| 537 |
vfio_msix_vector_release)) {
|
| 538 |
error_report("vfio: msix_set_vector_notifiers failed\n");
|
| 539 |
} |
| 540 |
|
| 541 |
DPRINTF("%s(%04x:%02x:%02x.%x)\n", __func__, vdev->host.domain,
|
| 542 |
vdev->host.bus, vdev->host.slot, vdev->host.function); |
| 543 |
} |
| 544 |
|
| 545 |
static void vfio_enable_msi(VFIODevice *vdev) |
| 546 |
{
|
| 547 |
int ret, i;
|
| 548 |
|
| 549 |
vfio_disable_interrupts(vdev); |
| 550 |
|
| 551 |
vdev->nr_vectors = msi_nr_vectors_allocated(&vdev->pdev); |
| 552 |
retry:
|
| 553 |
vdev->msi_vectors = g_malloc0(vdev->nr_vectors * sizeof(VFIOMSIVector));
|
| 554 |
|
| 555 |
for (i = 0; i < vdev->nr_vectors; i++) { |
| 556 |
MSIMessage msg; |
| 557 |
VFIOMSIVector *vector = &vdev->msi_vectors[i]; |
| 558 |
|
| 559 |
vector->vdev = vdev; |
| 560 |
vector->use = true;
|
| 561 |
|
| 562 |
if (event_notifier_init(&vector->interrupt, 0)) { |
| 563 |
error_report("vfio: Error: event_notifier_init failed\n");
|
| 564 |
} |
| 565 |
|
| 566 |
msg = msi_get_msg(&vdev->pdev, i); |
| 567 |
|
| 568 |
/*
|
| 569 |
* Attempt to enable route through KVM irqchip,
|
| 570 |
* default to userspace handling if unavailable.
|
| 571 |
*/
|
| 572 |
vector->virq = kvm_irqchip_add_msi_route(kvm_state, msg); |
| 573 |
if (vector->virq < 0 || |
| 574 |
kvm_irqchip_add_irqfd_notifier(kvm_state, &vector->interrupt, |
| 575 |
vector->virq) < 0) {
|
| 576 |
qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt), |
| 577 |
vfio_msi_interrupt, NULL, vector);
|
| 578 |
} |
| 579 |
} |
| 580 |
|
| 581 |
ret = vfio_enable_vectors(vdev, false);
|
| 582 |
if (ret) {
|
| 583 |
if (ret < 0) { |
| 584 |
error_report("vfio: Error: Failed to setup MSI fds: %m\n");
|
| 585 |
} else if (ret != vdev->nr_vectors) { |
| 586 |
error_report("vfio: Error: Failed to enable %d "
|
| 587 |
"MSI vectors, retry with %d\n", vdev->nr_vectors, ret);
|
| 588 |
} |
| 589 |
|
| 590 |
for (i = 0; i < vdev->nr_vectors; i++) { |
| 591 |
VFIOMSIVector *vector = &vdev->msi_vectors[i]; |
| 592 |
if (vector->virq >= 0) { |
| 593 |
kvm_irqchip_remove_irqfd_notifier(kvm_state, &vector->interrupt, |
| 594 |
vector->virq); |
| 595 |
kvm_irqchip_release_virq(kvm_state, vector->virq); |
| 596 |
vector->virq = -1;
|
| 597 |
} else {
|
| 598 |
qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt), |
| 599 |
NULL, NULL, NULL); |
| 600 |
} |
| 601 |
event_notifier_cleanup(&vector->interrupt); |
| 602 |
} |
| 603 |
|
| 604 |
g_free(vdev->msi_vectors); |
| 605 |
|
| 606 |
if (ret > 0 && ret != vdev->nr_vectors) { |
| 607 |
vdev->nr_vectors = ret; |
| 608 |
goto retry;
|
| 609 |
} |
| 610 |
vdev->nr_vectors = 0;
|
| 611 |
|
| 612 |
return;
|
| 613 |
} |
| 614 |
|
| 615 |
vdev->interrupt = VFIO_INT_MSI; |
| 616 |
|
| 617 |
DPRINTF("%s(%04x:%02x:%02x.%x) Enabled %d MSI vectors\n", __func__,
|
| 618 |
vdev->host.domain, vdev->host.bus, vdev->host.slot, |
| 619 |
vdev->host.function, vdev->nr_vectors); |
| 620 |
} |
| 621 |
|
| 622 |
static void vfio_disable_msi_common(VFIODevice *vdev) |
| 623 |
{
|
| 624 |
g_free(vdev->msi_vectors); |
| 625 |
vdev->msi_vectors = NULL;
|
| 626 |
vdev->nr_vectors = 0;
|
| 627 |
vdev->interrupt = VFIO_INT_NONE; |
| 628 |
|
| 629 |
vfio_enable_intx(vdev); |
| 630 |
} |
| 631 |
|
| 632 |
static void vfio_disable_msix(VFIODevice *vdev) |
| 633 |
{
|
| 634 |
msix_unset_vector_notifiers(&vdev->pdev); |
| 635 |
|
| 636 |
if (vdev->nr_vectors) {
|
| 637 |
vfio_disable_irqindex(vdev, VFIO_PCI_MSIX_IRQ_INDEX); |
| 638 |
} |
| 639 |
|
| 640 |
vfio_disable_msi_common(vdev); |
| 641 |
|
| 642 |
DPRINTF("%s(%04x:%02x:%02x.%x)\n", __func__, vdev->host.domain,
|
| 643 |
vdev->host.bus, vdev->host.slot, vdev->host.function); |
| 644 |
} |
| 645 |
|
| 646 |
static void vfio_disable_msi(VFIODevice *vdev) |
| 647 |
{
|
| 648 |
int i;
|
| 649 |
|
| 650 |
vfio_disable_irqindex(vdev, VFIO_PCI_MSI_IRQ_INDEX); |
| 651 |
|
| 652 |
for (i = 0; i < vdev->nr_vectors; i++) { |
| 653 |
VFIOMSIVector *vector = &vdev->msi_vectors[i]; |
| 654 |
|
| 655 |
if (!vector->use) {
|
| 656 |
continue;
|
| 657 |
} |
| 658 |
|
| 659 |
if (vector->virq >= 0) { |
| 660 |
kvm_irqchip_remove_irqfd_notifier(kvm_state, |
| 661 |
&vector->interrupt, vector->virq); |
| 662 |
kvm_irqchip_release_virq(kvm_state, vector->virq); |
| 663 |
vector->virq = -1;
|
| 664 |
} else {
|
| 665 |
qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt), |
| 666 |
NULL, NULL, NULL); |
| 667 |
} |
| 668 |
|
| 669 |
event_notifier_cleanup(&vector->interrupt); |
| 670 |
} |
| 671 |
|
| 672 |
vfio_disable_msi_common(vdev); |
| 673 |
|
| 674 |
DPRINTF("%s(%04x:%02x:%02x.%x)\n", __func__, vdev->host.domain,
|
| 675 |
vdev->host.bus, vdev->host.slot, vdev->host.function); |
| 676 |
} |
| 677 |
|
| 678 |
/*
|
| 679 |
* IO Port/MMIO - Beware of the endians, VFIO is always little endian
|
| 680 |
*/
|
| 681 |
static void vfio_bar_write(void *opaque, target_phys_addr_t addr, |
| 682 |
uint64_t data, unsigned size)
|
| 683 |
{
|
| 684 |
VFIOBAR *bar = opaque; |
| 685 |
union {
|
| 686 |
uint8_t byte; |
| 687 |
uint16_t word; |
| 688 |
uint32_t dword; |
| 689 |
uint64_t qword; |
| 690 |
} buf; |
| 691 |
|
| 692 |
switch (size) {
|
| 693 |
case 1: |
| 694 |
buf.byte = data; |
| 695 |
break;
|
| 696 |
case 2: |
| 697 |
buf.word = cpu_to_le16(data); |
| 698 |
break;
|
| 699 |
case 4: |
| 700 |
buf.dword = cpu_to_le32(data); |
| 701 |
break;
|
| 702 |
default:
|
| 703 |
hw_error("vfio: unsupported write size, %d bytes\n", size);
|
| 704 |
break;
|
| 705 |
} |
| 706 |
|
| 707 |
if (pwrite(bar->fd, &buf, size, bar->fd_offset + addr) != size) {
|
| 708 |
error_report("%s(,0x%"TARGET_PRIxPHYS", 0x%"PRIx64", %d) failed: %m\n", |
| 709 |
__func__, addr, data, size); |
| 710 |
} |
| 711 |
|
| 712 |
DPRINTF("%s(BAR%d+0x%"TARGET_PRIxPHYS", 0x%"PRIx64", %d)\n", |
| 713 |
__func__, bar->nr, addr, data, size); |
| 714 |
|
| 715 |
/*
|
| 716 |
* A read or write to a BAR always signals an INTx EOI. This will
|
| 717 |
* do nothing if not pending (including not in INTx mode). We assume
|
| 718 |
* that a BAR access is in response to an interrupt and that BAR
|
| 719 |
* accesses will service the interrupt. Unfortunately, we don't know
|
| 720 |
* which access will service the interrupt, so we're potentially
|
| 721 |
* getting quite a few host interrupts per guest interrupt.
|
| 722 |
*/
|
| 723 |
vfio_eoi(container_of(bar, VFIODevice, bars[bar->nr])); |
| 724 |
} |
| 725 |
|
| 726 |
static uint64_t vfio_bar_read(void *opaque, |
| 727 |
target_phys_addr_t addr, unsigned size)
|
| 728 |
{
|
| 729 |
VFIOBAR *bar = opaque; |
| 730 |
union {
|
| 731 |
uint8_t byte; |
| 732 |
uint16_t word; |
| 733 |
uint32_t dword; |
| 734 |
uint64_t qword; |
| 735 |
} buf; |
| 736 |
uint64_t data = 0;
|
| 737 |
|
| 738 |
if (pread(bar->fd, &buf, size, bar->fd_offset + addr) != size) {
|
| 739 |
error_report("%s(,0x%"TARGET_PRIxPHYS", %d) failed: %m\n", |
| 740 |
__func__, addr, size); |
| 741 |
return (uint64_t)-1; |
| 742 |
} |
| 743 |
|
| 744 |
switch (size) {
|
| 745 |
case 1: |
| 746 |
data = buf.byte; |
| 747 |
break;
|
| 748 |
case 2: |
| 749 |
data = le16_to_cpu(buf.word); |
| 750 |
break;
|
| 751 |
case 4: |
| 752 |
data = le32_to_cpu(buf.dword); |
| 753 |
break;
|
| 754 |
default:
|
| 755 |
hw_error("vfio: unsupported read size, %d bytes\n", size);
|
| 756 |
break;
|
| 757 |
} |
| 758 |
|
| 759 |
DPRINTF("%s(BAR%d+0x%"TARGET_PRIxPHYS", %d) = 0x%"PRIx64"\n", |
| 760 |
__func__, bar->nr, addr, size, data); |
| 761 |
|
| 762 |
/* Same as write above */
|
| 763 |
vfio_eoi(container_of(bar, VFIODevice, bars[bar->nr])); |
| 764 |
|
| 765 |
return data;
|
| 766 |
} |
| 767 |
|
| 768 |
static const MemoryRegionOps vfio_bar_ops = { |
| 769 |
.read = vfio_bar_read, |
| 770 |
.write = vfio_bar_write, |
| 771 |
.endianness = DEVICE_LITTLE_ENDIAN, |
| 772 |
}; |
| 773 |
|
| 774 |
/*
|
| 775 |
* PCI config space
|
| 776 |
*/
|
| 777 |
static uint32_t vfio_pci_read_config(PCIDevice *pdev, uint32_t addr, int len) |
| 778 |
{
|
| 779 |
VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev); |
| 780 |
uint32_t val = 0;
|
| 781 |
|
| 782 |
/*
|
| 783 |
* We only need QEMU PCI config support for the ROM BAR, the MSI and MSIX
|
| 784 |
* capabilities, and the multifunction bit below. We let VFIO handle
|
| 785 |
* virtualizing everything else. Performance is not a concern here.
|
| 786 |
*/
|
| 787 |
if (ranges_overlap(addr, len, PCI_ROM_ADDRESS, 4) || |
| 788 |
(pdev->cap_present & QEMU_PCI_CAP_MSIX && |
| 789 |
ranges_overlap(addr, len, pdev->msix_cap, MSIX_CAP_LENGTH)) || |
| 790 |
(pdev->cap_present & QEMU_PCI_CAP_MSI && |
| 791 |
ranges_overlap(addr, len, pdev->msi_cap, vdev->msi_cap_size))) {
|
| 792 |
|
| 793 |
val = pci_default_read_config(pdev, addr, len); |
| 794 |
} else {
|
| 795 |
if (pread(vdev->fd, &val, len, vdev->config_offset + addr) != len) {
|
| 796 |
error_report("%s(%04x:%02x:%02x.%x, 0x%x, 0x%x) failed: %m\n",
|
| 797 |
__func__, vdev->host.domain, vdev->host.bus, |
| 798 |
vdev->host.slot, vdev->host.function, addr, len); |
| 799 |
return -errno;
|
| 800 |
} |
| 801 |
val = le32_to_cpu(val); |
| 802 |
} |
| 803 |
|
| 804 |
/* Multifunction bit is virualized in QEMU */
|
| 805 |
if (unlikely(ranges_overlap(addr, len, PCI_HEADER_TYPE, 1))) { |
| 806 |
uint32_t mask = PCI_HEADER_TYPE_MULTI_FUNCTION; |
| 807 |
|
| 808 |
if (len == 4) { |
| 809 |
mask <<= 16;
|
| 810 |
} |
| 811 |
|
| 812 |
if (pdev->cap_present & QEMU_PCI_CAP_MULTIFUNCTION) {
|
| 813 |
val |= mask; |
| 814 |
} else {
|
| 815 |
val &= ~mask; |
| 816 |
} |
| 817 |
} |
| 818 |
|
| 819 |
DPRINTF("%s(%04x:%02x:%02x.%x, @0x%x, len=0x%x) %x\n", __func__,
|
| 820 |
vdev->host.domain, vdev->host.bus, vdev->host.slot, |
| 821 |
vdev->host.function, addr, len, val); |
| 822 |
|
| 823 |
return val;
|
| 824 |
} |
| 825 |
|
| 826 |
static void vfio_pci_write_config(PCIDevice *pdev, uint32_t addr, |
| 827 |
uint32_t val, int len)
|
| 828 |
{
|
| 829 |
VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev); |
| 830 |
uint32_t val_le = cpu_to_le32(val); |
| 831 |
|
| 832 |
DPRINTF("%s(%04x:%02x:%02x.%x, @0x%x, 0x%x, len=0x%x)\n", __func__,
|
| 833 |
vdev->host.domain, vdev->host.bus, vdev->host.slot, |
| 834 |
vdev->host.function, addr, val, len); |
| 835 |
|
| 836 |
/* Write everything to VFIO, let it filter out what we can't write */
|
| 837 |
if (pwrite(vdev->fd, &val_le, len, vdev->config_offset + addr) != len) {
|
| 838 |
error_report("%s(%04x:%02x:%02x.%x, 0x%x, 0x%x, 0x%x) failed: %m\n",
|
| 839 |
__func__, vdev->host.domain, vdev->host.bus, |
| 840 |
vdev->host.slot, vdev->host.function, addr, val, len); |
| 841 |
} |
| 842 |
|
| 843 |
/* Write standard header bits to emulation */
|
| 844 |
if (addr < PCI_CONFIG_HEADER_SIZE) {
|
| 845 |
pci_default_write_config(pdev, addr, val, len); |
| 846 |
return;
|
| 847 |
} |
| 848 |
|
| 849 |
/* MSI/MSI-X Enabling/Disabling */
|
| 850 |
if (pdev->cap_present & QEMU_PCI_CAP_MSI &&
|
| 851 |
ranges_overlap(addr, len, pdev->msi_cap, vdev->msi_cap_size)) {
|
| 852 |
int is_enabled, was_enabled = msi_enabled(pdev);
|
| 853 |
|
| 854 |
pci_default_write_config(pdev, addr, val, len); |
| 855 |
|
| 856 |
is_enabled = msi_enabled(pdev); |
| 857 |
|
| 858 |
if (!was_enabled && is_enabled) {
|
| 859 |
vfio_enable_msi(vdev); |
| 860 |
} else if (was_enabled && !is_enabled) { |
| 861 |
vfio_disable_msi(vdev); |
| 862 |
} |
| 863 |
} |
| 864 |
|
| 865 |
if (pdev->cap_present & QEMU_PCI_CAP_MSIX &&
|
| 866 |
ranges_overlap(addr, len, pdev->msix_cap, MSIX_CAP_LENGTH)) {
|
| 867 |
int is_enabled, was_enabled = msix_enabled(pdev);
|
| 868 |
|
| 869 |
pci_default_write_config(pdev, addr, val, len); |
| 870 |
|
| 871 |
is_enabled = msix_enabled(pdev); |
| 872 |
|
| 873 |
if (!was_enabled && is_enabled) {
|
| 874 |
vfio_enable_msix(vdev); |
| 875 |
} else if (was_enabled && !is_enabled) { |
| 876 |
vfio_disable_msix(vdev); |
| 877 |
} |
| 878 |
} |
| 879 |
} |
| 880 |
|
| 881 |
/*
|
| 882 |
* DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86
|
| 883 |
*/
|
| 884 |
static int vfio_dma_unmap(VFIOContainer *container, |
| 885 |
target_phys_addr_t iova, ram_addr_t size) |
| 886 |
{
|
| 887 |
struct vfio_iommu_type1_dma_unmap unmap = {
|
| 888 |
.argsz = sizeof(unmap),
|
| 889 |
.flags = 0,
|
| 890 |
.iova = iova, |
| 891 |
.size = size, |
| 892 |
}; |
| 893 |
|
| 894 |
if (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
|
| 895 |
DPRINTF("VFIO_UNMAP_DMA: %d\n", -errno);
|
| 896 |
return -errno;
|
| 897 |
} |
| 898 |
|
| 899 |
return 0; |
| 900 |
} |
| 901 |
|
| 902 |
static int vfio_dma_map(VFIOContainer *container, target_phys_addr_t iova, |
| 903 |
ram_addr_t size, void *vaddr, bool readonly) |
| 904 |
{
|
| 905 |
struct vfio_iommu_type1_dma_map map = {
|
| 906 |
.argsz = sizeof(map),
|
| 907 |
.flags = VFIO_DMA_MAP_FLAG_READ, |
| 908 |
.vaddr = (__u64)(uintptr_t)vaddr, |
| 909 |
.iova = iova, |
| 910 |
.size = size, |
| 911 |
}; |
| 912 |
|
| 913 |
if (!readonly) {
|
| 914 |
map.flags |= VFIO_DMA_MAP_FLAG_WRITE; |
| 915 |
} |
| 916 |
|
| 917 |
/*
|
| 918 |
* Try the mapping, if it fails with EBUSY, unmap the region and try
|
| 919 |
* again. This shouldn't be necessary, but we sometimes see it in
|
| 920 |
* the the VGA ROM space.
|
| 921 |
*/
|
| 922 |
if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0 || |
| 923 |
(errno == EBUSY && vfio_dma_unmap(container, iova, size) == 0 &&
|
| 924 |
ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) {
|
| 925 |
return 0; |
| 926 |
} |
| 927 |
|
| 928 |
DPRINTF("VFIO_MAP_DMA: %d\n", -errno);
|
| 929 |
return -errno;
|
| 930 |
} |
| 931 |
|
| 932 |
static void vfio_listener_dummy1(MemoryListener *listener) |
| 933 |
{
|
| 934 |
/* We don't do batching (begin/commit) or care about logging */
|
| 935 |
} |
| 936 |
|
| 937 |
static void vfio_listener_dummy2(MemoryListener *listener, |
| 938 |
MemoryRegionSection *section) |
| 939 |
{
|
| 940 |
/* We don't do logging or care about nops */
|
| 941 |
} |
| 942 |
|
| 943 |
static void vfio_listener_dummy3(MemoryListener *listener, |
| 944 |
MemoryRegionSection *section, |
| 945 |
bool match_data, uint64_t data,
|
| 946 |
EventNotifier *e) |
| 947 |
{
|
| 948 |
/* We don't care about eventfds */
|
| 949 |
} |
| 950 |
|
| 951 |
static bool vfio_listener_skipped_section(MemoryRegionSection *section) |
| 952 |
{
|
| 953 |
return !memory_region_is_ram(section->mr);
|
| 954 |
} |
| 955 |
|
| 956 |
static void vfio_listener_region_add(MemoryListener *listener, |
| 957 |
MemoryRegionSection *section) |
| 958 |
{
|
| 959 |
VFIOContainer *container = container_of(listener, VFIOContainer, |
| 960 |
iommu_data.listener); |
| 961 |
target_phys_addr_t iova, end; |
| 962 |
void *vaddr;
|
| 963 |
int ret;
|
| 964 |
|
| 965 |
if (vfio_listener_skipped_section(section)) {
|
| 966 |
DPRINTF("vfio: SKIPPING region_add %"TARGET_PRIxPHYS" - %"PRIx64"\n", |
| 967 |
section->offset_within_address_space, |
| 968 |
section->offset_within_address_space + section->size - 1);
|
| 969 |
return;
|
| 970 |
} |
| 971 |
|
| 972 |
if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) !=
|
| 973 |
(section->offset_within_region & ~TARGET_PAGE_MASK))) {
|
| 974 |
error_report("%s received unaligned region\n", __func__);
|
| 975 |
return;
|
| 976 |
} |
| 977 |
|
| 978 |
iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); |
| 979 |
end = (section->offset_within_address_space + section->size) & |
| 980 |
TARGET_PAGE_MASK; |
| 981 |
|
| 982 |
if (iova >= end) {
|
| 983 |
return;
|
| 984 |
} |
| 985 |
|
| 986 |
vaddr = memory_region_get_ram_ptr(section->mr) + |
| 987 |
section->offset_within_region + |
| 988 |
(iova - section->offset_within_address_space); |
| 989 |
|
| 990 |
DPRINTF("vfio: region_add %"TARGET_PRIxPHYS" - %"TARGET_PRIxPHYS" [%p]\n", |
| 991 |
iova, end - 1, vaddr);
|
| 992 |
|
| 993 |
ret = vfio_dma_map(container, iova, end - iova, vaddr, section->readonly); |
| 994 |
if (ret) {
|
| 995 |
error_report("vfio_dma_map(%p, 0x%"TARGET_PRIxPHYS", " |
| 996 |
"0x%"TARGET_PRIxPHYS", %p) = %d (%m)\n", |
| 997 |
container, iova, end - iova, vaddr, ret); |
| 998 |
} |
| 999 |
} |
| 1000 |
|
| 1001 |
static void vfio_listener_region_del(MemoryListener *listener, |
| 1002 |
MemoryRegionSection *section) |
| 1003 |
{
|
| 1004 |
VFIOContainer *container = container_of(listener, VFIOContainer, |
| 1005 |
iommu_data.listener); |
| 1006 |
target_phys_addr_t iova, end; |
| 1007 |
int ret;
|
| 1008 |
|
| 1009 |
if (vfio_listener_skipped_section(section)) {
|
| 1010 |
DPRINTF("vfio: SKIPPING region_del %"TARGET_PRIxPHYS" - %"PRIx64"\n", |
| 1011 |
section->offset_within_address_space, |
| 1012 |
section->offset_within_address_space + section->size - 1);
|
| 1013 |
return;
|
| 1014 |
} |
| 1015 |
|
| 1016 |
if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) !=
|
| 1017 |
(section->offset_within_region & ~TARGET_PAGE_MASK))) {
|
| 1018 |
error_report("%s received unaligned region\n", __func__);
|
| 1019 |
return;
|
| 1020 |
} |
| 1021 |
|
| 1022 |
iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); |
| 1023 |
end = (section->offset_within_address_space + section->size) & |
| 1024 |
TARGET_PAGE_MASK; |
| 1025 |
|
| 1026 |
if (iova >= end) {
|
| 1027 |
return;
|
| 1028 |
} |
| 1029 |
|
| 1030 |
DPRINTF("vfio: region_del %"TARGET_PRIxPHYS" - %"TARGET_PRIxPHYS"\n", |
| 1031 |
iova, end - 1);
|
| 1032 |
|
| 1033 |
ret = vfio_dma_unmap(container, iova, end - iova); |
| 1034 |
if (ret) {
|
| 1035 |
error_report("vfio_dma_unmap(%p, 0x%"TARGET_PRIxPHYS", " |
| 1036 |
"0x%"TARGET_PRIxPHYS") = %d (%m)\n", |
| 1037 |
container, iova, end - iova, ret); |
| 1038 |
} |
| 1039 |
} |
| 1040 |
|
| 1041 |
static MemoryListener vfio_memory_listener = {
|
| 1042 |
.begin = vfio_listener_dummy1, |
| 1043 |
.commit = vfio_listener_dummy1, |
| 1044 |
.region_add = vfio_listener_region_add, |
| 1045 |
.region_del = vfio_listener_region_del, |
| 1046 |
.region_nop = vfio_listener_dummy2, |
| 1047 |
.log_start = vfio_listener_dummy2, |
| 1048 |
.log_stop = vfio_listener_dummy2, |
| 1049 |
.log_sync = vfio_listener_dummy2, |
| 1050 |
.log_global_start = vfio_listener_dummy1, |
| 1051 |
.log_global_stop = vfio_listener_dummy1, |
| 1052 |
.eventfd_add = vfio_listener_dummy3, |
| 1053 |
.eventfd_del = vfio_listener_dummy3, |
| 1054 |
}; |
| 1055 |
|
| 1056 |
static void vfio_listener_release(VFIOContainer *container) |
| 1057 |
{
|
| 1058 |
memory_listener_unregister(&container->iommu_data.listener); |
| 1059 |
} |
| 1060 |
|
| 1061 |
/*
|
| 1062 |
* Interrupt setup
|
| 1063 |
*/
|
| 1064 |
static void vfio_disable_interrupts(VFIODevice *vdev) |
| 1065 |
{
|
| 1066 |
switch (vdev->interrupt) {
|
| 1067 |
case VFIO_INT_INTx:
|
| 1068 |
vfio_disable_intx(vdev); |
| 1069 |
break;
|
| 1070 |
case VFIO_INT_MSI:
|
| 1071 |
vfio_disable_msi(vdev); |
| 1072 |
break;
|
| 1073 |
case VFIO_INT_MSIX:
|
| 1074 |
vfio_disable_msix(vdev); |
| 1075 |
break;
|
| 1076 |
} |
| 1077 |
} |
| 1078 |
|
| 1079 |
static int vfio_setup_msi(VFIODevice *vdev, int pos) |
| 1080 |
{
|
| 1081 |
uint16_t ctrl; |
| 1082 |
bool msi_64bit, msi_maskbit;
|
| 1083 |
int ret, entries;
|
| 1084 |
|
| 1085 |
if (pread(vdev->fd, &ctrl, sizeof(ctrl), |
| 1086 |
vdev->config_offset + pos + PCI_CAP_FLAGS) != sizeof(ctrl)) {
|
| 1087 |
return -errno;
|
| 1088 |
} |
| 1089 |
ctrl = le16_to_cpu(ctrl); |
| 1090 |
|
| 1091 |
msi_64bit = !!(ctrl & PCI_MSI_FLAGS_64BIT); |
| 1092 |
msi_maskbit = !!(ctrl & PCI_MSI_FLAGS_MASKBIT); |
| 1093 |
entries = 1 << ((ctrl & PCI_MSI_FLAGS_QMASK) >> 1); |
| 1094 |
|
| 1095 |
DPRINTF("%04x:%02x:%02x.%x PCI MSI CAP @0x%x\n", vdev->host.domain,
|
| 1096 |
vdev->host.bus, vdev->host.slot, vdev->host.function, pos); |
| 1097 |
|
| 1098 |
ret = msi_init(&vdev->pdev, pos, entries, msi_64bit, msi_maskbit); |
| 1099 |
if (ret < 0) { |
| 1100 |
if (ret == -ENOTSUP) {
|
| 1101 |
return 0; |
| 1102 |
} |
| 1103 |
error_report("vfio: msi_init failed\n");
|
| 1104 |
return ret;
|
| 1105 |
} |
| 1106 |
vdev->msi_cap_size = 0xa + (msi_maskbit ? 0xa : 0) + (msi_64bit ? 0x4 : 0); |
| 1107 |
|
| 1108 |
return 0; |
| 1109 |
} |
| 1110 |
|
| 1111 |
/*
|
| 1112 |
* We don't have any control over how pci_add_capability() inserts
|
| 1113 |
* capabilities into the chain. In order to setup MSI-X we need a
|
| 1114 |
* MemoryRegion for the BAR. In order to setup the BAR and not
|
| 1115 |
* attempt to mmap the MSI-X table area, which VFIO won't allow, we
|
| 1116 |
* need to first look for where the MSI-X table lives. So we
|
| 1117 |
* unfortunately split MSI-X setup across two functions.
|
| 1118 |
*/
|
| 1119 |
static int vfio_early_setup_msix(VFIODevice *vdev) |
| 1120 |
{
|
| 1121 |
uint8_t pos; |
| 1122 |
uint16_t ctrl; |
| 1123 |
uint32_t table, pba; |
| 1124 |
|
| 1125 |
pos = pci_find_capability(&vdev->pdev, PCI_CAP_ID_MSIX); |
| 1126 |
if (!pos) {
|
| 1127 |
return 0; |
| 1128 |
} |
| 1129 |
|
| 1130 |
if (pread(vdev->fd, &ctrl, sizeof(ctrl), |
| 1131 |
vdev->config_offset + pos + PCI_CAP_FLAGS) != sizeof(ctrl)) {
|
| 1132 |
return -errno;
|
| 1133 |
} |
| 1134 |
|
| 1135 |
if (pread(vdev->fd, &table, sizeof(table), |
| 1136 |
vdev->config_offset + pos + PCI_MSIX_TABLE) != sizeof(table)) {
|
| 1137 |
return -errno;
|
| 1138 |
} |
| 1139 |
|
| 1140 |
if (pread(vdev->fd, &pba, sizeof(pba), |
| 1141 |
vdev->config_offset + pos + PCI_MSIX_PBA) != sizeof(pba)) {
|
| 1142 |
return -errno;
|
| 1143 |
} |
| 1144 |
|
| 1145 |
ctrl = le16_to_cpu(ctrl); |
| 1146 |
table = le32_to_cpu(table); |
| 1147 |
pba = le32_to_cpu(pba); |
| 1148 |
|
| 1149 |
vdev->msix = g_malloc0(sizeof(*(vdev->msix)));
|
| 1150 |
vdev->msix->table_bar = table & PCI_MSIX_FLAGS_BIRMASK; |
| 1151 |
vdev->msix->table_offset = table & ~PCI_MSIX_FLAGS_BIRMASK; |
| 1152 |
vdev->msix->pba_bar = pba & PCI_MSIX_FLAGS_BIRMASK; |
| 1153 |
vdev->msix->pba_offset = pba & ~PCI_MSIX_FLAGS_BIRMASK; |
| 1154 |
vdev->msix->entries = (ctrl & PCI_MSIX_FLAGS_QSIZE) + 1;
|
| 1155 |
|
| 1156 |
DPRINTF("%04x:%02x:%02x.%x "
|
| 1157 |
"PCI MSI-X CAP @0x%x, BAR %d, offset 0x%x, entries %d\n",
|
| 1158 |
vdev->host.domain, vdev->host.bus, vdev->host.slot, |
| 1159 |
vdev->host.function, pos, vdev->msix->table_bar, |
| 1160 |
vdev->msix->table_offset, vdev->msix->entries); |
| 1161 |
|
| 1162 |
return 0; |
| 1163 |
} |
| 1164 |
|
| 1165 |
static int vfio_setup_msix(VFIODevice *vdev, int pos) |
| 1166 |
{
|
| 1167 |
int ret;
|
| 1168 |
|
| 1169 |
ret = msix_init(&vdev->pdev, vdev->msix->entries, |
| 1170 |
&vdev->bars[vdev->msix->table_bar].mem, |
| 1171 |
vdev->msix->table_bar, vdev->msix->table_offset, |
| 1172 |
&vdev->bars[vdev->msix->pba_bar].mem, |
| 1173 |
vdev->msix->pba_bar, vdev->msix->pba_offset, pos); |
| 1174 |
if (ret < 0) { |
| 1175 |
if (ret == -ENOTSUP) {
|
| 1176 |
return 0; |
| 1177 |
} |
| 1178 |
error_report("vfio: msix_init failed\n");
|
| 1179 |
return ret;
|
| 1180 |
} |
| 1181 |
|
| 1182 |
return 0; |
| 1183 |
} |
| 1184 |
|
| 1185 |
static void vfio_teardown_msi(VFIODevice *vdev) |
| 1186 |
{
|
| 1187 |
msi_uninit(&vdev->pdev); |
| 1188 |
|
| 1189 |
if (vdev->msix) {
|
| 1190 |
msix_uninit(&vdev->pdev, &vdev->bars[vdev->msix->table_bar].mem, |
| 1191 |
&vdev->bars[vdev->msix->pba_bar].mem); |
| 1192 |
} |
| 1193 |
} |
| 1194 |
|
| 1195 |
/*
|
| 1196 |
* Resource setup
|
| 1197 |
*/
|
| 1198 |
static void vfio_mmap_set_enabled(VFIODevice *vdev, bool enabled) |
| 1199 |
{
|
| 1200 |
int i;
|
| 1201 |
|
| 1202 |
for (i = 0; i < PCI_ROM_SLOT; i++) { |
| 1203 |
VFIOBAR *bar = &vdev->bars[i]; |
| 1204 |
|
| 1205 |
if (!bar->size) {
|
| 1206 |
continue;
|
| 1207 |
} |
| 1208 |
|
| 1209 |
memory_region_set_enabled(&bar->mmap_mem, enabled); |
| 1210 |
if (vdev->msix && vdev->msix->table_bar == i) {
|
| 1211 |
memory_region_set_enabled(&vdev->msix->mmap_mem, enabled); |
| 1212 |
} |
| 1213 |
} |
| 1214 |
} |
| 1215 |
|
| 1216 |
static void vfio_unmap_bar(VFIODevice *vdev, int nr) |
| 1217 |
{
|
| 1218 |
VFIOBAR *bar = &vdev->bars[nr]; |
| 1219 |
|
| 1220 |
if (!bar->size) {
|
| 1221 |
return;
|
| 1222 |
} |
| 1223 |
|
| 1224 |
memory_region_del_subregion(&bar->mem, &bar->mmap_mem); |
| 1225 |
munmap(bar->mmap, memory_region_size(&bar->mmap_mem)); |
| 1226 |
|
| 1227 |
if (vdev->msix && vdev->msix->table_bar == nr) {
|
| 1228 |
memory_region_del_subregion(&bar->mem, &vdev->msix->mmap_mem); |
| 1229 |
munmap(vdev->msix->mmap, memory_region_size(&vdev->msix->mmap_mem)); |
| 1230 |
} |
| 1231 |
|
| 1232 |
memory_region_destroy(&bar->mem); |
| 1233 |
} |
| 1234 |
|
| 1235 |
static int vfio_mmap_bar(VFIOBAR *bar, MemoryRegion *mem, MemoryRegion *submem, |
| 1236 |
void **map, size_t size, off_t offset,
|
| 1237 |
const char *name) |
| 1238 |
{
|
| 1239 |
int ret = 0; |
| 1240 |
|
| 1241 |
if (size && bar->flags & VFIO_REGION_INFO_FLAG_MMAP) {
|
| 1242 |
int prot = 0; |
| 1243 |
|
| 1244 |
if (bar->flags & VFIO_REGION_INFO_FLAG_READ) {
|
| 1245 |
prot |= PROT_READ; |
| 1246 |
} |
| 1247 |
|
| 1248 |
if (bar->flags & VFIO_REGION_INFO_FLAG_WRITE) {
|
| 1249 |
prot |= PROT_WRITE; |
| 1250 |
} |
| 1251 |
|
| 1252 |
*map = mmap(NULL, size, prot, MAP_SHARED,
|
| 1253 |
bar->fd, bar->fd_offset + offset); |
| 1254 |
if (*map == MAP_FAILED) {
|
| 1255 |
*map = NULL;
|
| 1256 |
ret = -errno; |
| 1257 |
goto empty_region;
|
| 1258 |
} |
| 1259 |
|
| 1260 |
memory_region_init_ram_ptr(submem, name, size, *map); |
| 1261 |
} else {
|
| 1262 |
empty_region:
|
| 1263 |
/* Create a zero sized sub-region to make cleanup easy. */
|
| 1264 |
memory_region_init(submem, name, 0);
|
| 1265 |
} |
| 1266 |
|
| 1267 |
memory_region_add_subregion(mem, offset, submem); |
| 1268 |
|
| 1269 |
return ret;
|
| 1270 |
} |
| 1271 |
|
| 1272 |
static void vfio_map_bar(VFIODevice *vdev, int nr) |
| 1273 |
{
|
| 1274 |
VFIOBAR *bar = &vdev->bars[nr]; |
| 1275 |
unsigned size = bar->size;
|
| 1276 |
char name[64]; |
| 1277 |
uint32_t pci_bar; |
| 1278 |
uint8_t type; |
| 1279 |
int ret;
|
| 1280 |
|
| 1281 |
/* Skip both unimplemented BARs and the upper half of 64bit BARS. */
|
| 1282 |
if (!size) {
|
| 1283 |
return;
|
| 1284 |
} |
| 1285 |
|
| 1286 |
snprintf(name, sizeof(name), "VFIO %04x:%02x:%02x.%x BAR %d", |
| 1287 |
vdev->host.domain, vdev->host.bus, vdev->host.slot, |
| 1288 |
vdev->host.function, nr); |
| 1289 |
|
| 1290 |
/* Determine what type of BAR this is for registration */
|
| 1291 |
ret = pread(vdev->fd, &pci_bar, sizeof(pci_bar),
|
| 1292 |
vdev->config_offset + PCI_BASE_ADDRESS_0 + (4 * nr));
|
| 1293 |
if (ret != sizeof(pci_bar)) { |
| 1294 |
error_report("vfio: Failed to read BAR %d (%m)\n", nr);
|
| 1295 |
return;
|
| 1296 |
} |
| 1297 |
|
| 1298 |
pci_bar = le32_to_cpu(pci_bar); |
| 1299 |
type = pci_bar & (pci_bar & PCI_BASE_ADDRESS_SPACE_IO ? |
| 1300 |
~PCI_BASE_ADDRESS_IO_MASK : ~PCI_BASE_ADDRESS_MEM_MASK); |
| 1301 |
|
| 1302 |
/* A "slow" read/write mapping underlies all BARs */
|
| 1303 |
memory_region_init_io(&bar->mem, &vfio_bar_ops, bar, name, size); |
| 1304 |
pci_register_bar(&vdev->pdev, nr, type, &bar->mem); |
| 1305 |
|
| 1306 |
/*
|
| 1307 |
* We can't mmap areas overlapping the MSIX vector table, so we
|
| 1308 |
* potentially insert a direct-mapped subregion before and after it.
|
| 1309 |
*/
|
| 1310 |
if (vdev->msix && vdev->msix->table_bar == nr) {
|
| 1311 |
size = vdev->msix->table_offset & TARGET_PAGE_MASK; |
| 1312 |
} |
| 1313 |
|
| 1314 |
strncat(name, " mmap", sizeof(name) - strlen(name) - 1); |
| 1315 |
if (vfio_mmap_bar(bar, &bar->mem,
|
| 1316 |
&bar->mmap_mem, &bar->mmap, size, 0, name)) {
|
| 1317 |
error_report("%s unsupported. Performance may be slow\n", name);
|
| 1318 |
} |
| 1319 |
|
| 1320 |
if (vdev->msix && vdev->msix->table_bar == nr) {
|
| 1321 |
unsigned start;
|
| 1322 |
|
| 1323 |
start = TARGET_PAGE_ALIGN(vdev->msix->table_offset + |
| 1324 |
(vdev->msix->entries * PCI_MSIX_ENTRY_SIZE)); |
| 1325 |
|
| 1326 |
size = start < bar->size ? bar->size - start : 0;
|
| 1327 |
strncat(name, " msix-hi", sizeof(name) - strlen(name) - 1); |
| 1328 |
/* VFIOMSIXInfo contains another MemoryRegion for this mapping */
|
| 1329 |
if (vfio_mmap_bar(bar, &bar->mem, &vdev->msix->mmap_mem,
|
| 1330 |
&vdev->msix->mmap, size, start, name)) {
|
| 1331 |
error_report("%s unsupported. Performance may be slow\n", name);
|
| 1332 |
} |
| 1333 |
} |
| 1334 |
} |
| 1335 |
|
| 1336 |
static void vfio_map_bars(VFIODevice *vdev) |
| 1337 |
{
|
| 1338 |
int i;
|
| 1339 |
|
| 1340 |
for (i = 0; i < PCI_ROM_SLOT; i++) { |
| 1341 |
vfio_map_bar(vdev, i); |
| 1342 |
} |
| 1343 |
} |
| 1344 |
|
| 1345 |
static void vfio_unmap_bars(VFIODevice *vdev) |
| 1346 |
{
|
| 1347 |
int i;
|
| 1348 |
|
| 1349 |
for (i = 0; i < PCI_ROM_SLOT; i++) { |
| 1350 |
vfio_unmap_bar(vdev, i); |
| 1351 |
} |
| 1352 |
} |
| 1353 |
|
| 1354 |
/*
|
| 1355 |
* General setup
|
| 1356 |
*/
|
| 1357 |
static uint8_t vfio_std_cap_max_size(PCIDevice *pdev, uint8_t pos)
|
| 1358 |
{
|
| 1359 |
uint8_t tmp, next = 0xff;
|
| 1360 |
|
| 1361 |
for (tmp = pdev->config[PCI_CAPABILITY_LIST]; tmp;
|
| 1362 |
tmp = pdev->config[tmp + 1]) {
|
| 1363 |
if (tmp > pos && tmp < next) {
|
| 1364 |
next = tmp; |
| 1365 |
} |
| 1366 |
} |
| 1367 |
|
| 1368 |
return next - pos;
|
| 1369 |
} |
| 1370 |
|
| 1371 |
static int vfio_add_std_cap(VFIODevice *vdev, uint8_t pos) |
| 1372 |
{
|
| 1373 |
PCIDevice *pdev = &vdev->pdev; |
| 1374 |
uint8_t cap_id, next, size; |
| 1375 |
int ret;
|
| 1376 |
|
| 1377 |
cap_id = pdev->config[pos]; |
| 1378 |
next = pdev->config[pos + 1];
|
| 1379 |
|
| 1380 |
/*
|
| 1381 |
* If it becomes important to configure capabilities to their actual
|
| 1382 |
* size, use this as the default when it's something we don't recognize.
|
| 1383 |
* Since QEMU doesn't actually handle many of the config accesses,
|
| 1384 |
* exact size doesn't seem worthwhile.
|
| 1385 |
*/
|
| 1386 |
size = vfio_std_cap_max_size(pdev, pos); |
| 1387 |
|
| 1388 |
/*
|
| 1389 |
* pci_add_capability always inserts the new capability at the head
|
| 1390 |
* of the chain. Therefore to end up with a chain that matches the
|
| 1391 |
* physical device, we insert from the end by making this recursive.
|
| 1392 |
* This is also why we pre-caclulate size above as cached config space
|
| 1393 |
* will be changed as we unwind the stack.
|
| 1394 |
*/
|
| 1395 |
if (next) {
|
| 1396 |
ret = vfio_add_std_cap(vdev, next); |
| 1397 |
if (ret) {
|
| 1398 |
return ret;
|
| 1399 |
} |
| 1400 |
} else {
|
| 1401 |
pdev->config[PCI_CAPABILITY_LIST] = 0; /* Begin the rebuild */ |
| 1402 |
} |
| 1403 |
|
| 1404 |
switch (cap_id) {
|
| 1405 |
case PCI_CAP_ID_MSI:
|
| 1406 |
ret = vfio_setup_msi(vdev, pos); |
| 1407 |
break;
|
| 1408 |
case PCI_CAP_ID_MSIX:
|
| 1409 |
ret = vfio_setup_msix(vdev, pos); |
| 1410 |
break;
|
| 1411 |
default:
|
| 1412 |
ret = pci_add_capability(pdev, cap_id, pos, size); |
| 1413 |
break;
|
| 1414 |
} |
| 1415 |
|
| 1416 |
if (ret < 0) { |
| 1417 |
error_report("vfio: %04x:%02x:%02x.%x Error adding PCI capability "
|
| 1418 |
"0x%x[0x%x]@0x%x: %d\n", vdev->host.domain,
|
| 1419 |
vdev->host.bus, vdev->host.slot, vdev->host.function, |
| 1420 |
cap_id, size, pos, ret); |
| 1421 |
return ret;
|
| 1422 |
} |
| 1423 |
|
| 1424 |
return 0; |
| 1425 |
} |
| 1426 |
|
| 1427 |
static int vfio_add_capabilities(VFIODevice *vdev) |
| 1428 |
{
|
| 1429 |
PCIDevice *pdev = &vdev->pdev; |
| 1430 |
|
| 1431 |
if (!(pdev->config[PCI_STATUS] & PCI_STATUS_CAP_LIST) ||
|
| 1432 |
!pdev->config[PCI_CAPABILITY_LIST]) {
|
| 1433 |
return 0; /* Nothing to add */ |
| 1434 |
} |
| 1435 |
|
| 1436 |
return vfio_add_std_cap(vdev, pdev->config[PCI_CAPABILITY_LIST]);
|
| 1437 |
} |
| 1438 |
|
| 1439 |
static int vfio_load_rom(VFIODevice *vdev) |
| 1440 |
{
|
| 1441 |
uint64_t size = vdev->rom_size; |
| 1442 |
char name[32]; |
| 1443 |
off_t off = 0, voff = vdev->rom_offset;
|
| 1444 |
ssize_t bytes; |
| 1445 |
void *ptr;
|
| 1446 |
|
| 1447 |
/* If loading ROM from file, pci handles it */
|
| 1448 |
if (vdev->pdev.romfile || !vdev->pdev.rom_bar || !size) {
|
| 1449 |
return 0; |
| 1450 |
} |
| 1451 |
|
| 1452 |
DPRINTF("%s(%04x:%02x:%02x.%x)\n", __func__, vdev->host.domain,
|
| 1453 |
vdev->host.bus, vdev->host.slot, vdev->host.function); |
| 1454 |
|
| 1455 |
snprintf(name, sizeof(name), "vfio[%04x:%02x:%02x.%x].rom", |
| 1456 |
vdev->host.domain, vdev->host.bus, vdev->host.slot, |
| 1457 |
vdev->host.function); |
| 1458 |
memory_region_init_ram(&vdev->pdev.rom, name, size); |
| 1459 |
ptr = memory_region_get_ram_ptr(&vdev->pdev.rom); |
| 1460 |
memset(ptr, 0xff, size);
|
| 1461 |
|
| 1462 |
while (size) {
|
| 1463 |
bytes = pread(vdev->fd, ptr + off, size, voff + off); |
| 1464 |
if (bytes == 0) { |
| 1465 |
break; /* expect that we could get back less than the ROM BAR */ |
| 1466 |
} else if (bytes > 0) { |
| 1467 |
off += bytes; |
| 1468 |
size -= bytes; |
| 1469 |
} else {
|
| 1470 |
if (errno == EINTR || errno == EAGAIN) {
|
| 1471 |
continue;
|
| 1472 |
} |
| 1473 |
error_report("vfio: Error reading device ROM: %m\n");
|
| 1474 |
memory_region_destroy(&vdev->pdev.rom); |
| 1475 |
return -errno;
|
| 1476 |
} |
| 1477 |
} |
| 1478 |
|
| 1479 |
pci_register_bar(&vdev->pdev, PCI_ROM_SLOT, 0, &vdev->pdev.rom);
|
| 1480 |
vdev->pdev.has_rom = true;
|
| 1481 |
return 0; |
| 1482 |
} |
| 1483 |
|
| 1484 |
static int vfio_connect_container(VFIOGroup *group) |
| 1485 |
{
|
| 1486 |
VFIOContainer *container; |
| 1487 |
int ret, fd;
|
| 1488 |
|
| 1489 |
if (group->container) {
|
| 1490 |
return 0; |
| 1491 |
} |
| 1492 |
|
| 1493 |
QLIST_FOREACH(container, &container_list, next) {
|
| 1494 |
if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) {
|
| 1495 |
group->container = container; |
| 1496 |
QLIST_INSERT_HEAD(&container->group_list, group, container_next); |
| 1497 |
return 0; |
| 1498 |
} |
| 1499 |
} |
| 1500 |
|
| 1501 |
fd = qemu_open("/dev/vfio/vfio", O_RDWR);
|
| 1502 |
if (fd < 0) { |
| 1503 |
error_report("vfio: failed to open /dev/vfio/vfio: %m\n");
|
| 1504 |
return -errno;
|
| 1505 |
} |
| 1506 |
|
| 1507 |
ret = ioctl(fd, VFIO_GET_API_VERSION); |
| 1508 |
if (ret != VFIO_API_VERSION) {
|
| 1509 |
error_report("vfio: supported vfio version: %d, "
|
| 1510 |
"reported version: %d\n", VFIO_API_VERSION, ret);
|
| 1511 |
close(fd); |
| 1512 |
return -EINVAL;
|
| 1513 |
} |
| 1514 |
|
| 1515 |
container = g_malloc0(sizeof(*container));
|
| 1516 |
container->fd = fd; |
| 1517 |
|
| 1518 |
if (ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1_IOMMU)) {
|
| 1519 |
ret = ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &fd); |
| 1520 |
if (ret) {
|
| 1521 |
error_report("vfio: failed to set group container: %m\n");
|
| 1522 |
g_free(container); |
| 1523 |
close(fd); |
| 1524 |
return -errno;
|
| 1525 |
} |
| 1526 |
|
| 1527 |
ret = ioctl(fd, VFIO_SET_IOMMU, VFIO_TYPE1_IOMMU); |
| 1528 |
if (ret) {
|
| 1529 |
error_report("vfio: failed to set iommu for container: %m\n");
|
| 1530 |
g_free(container); |
| 1531 |
close(fd); |
| 1532 |
return -errno;
|
| 1533 |
} |
| 1534 |
|
| 1535 |
container->iommu_data.listener = vfio_memory_listener; |
| 1536 |
container->iommu_data.release = vfio_listener_release; |
| 1537 |
|
| 1538 |
memory_listener_register(&container->iommu_data.listener, |
| 1539 |
get_system_memory()); |
| 1540 |
} else {
|
| 1541 |
error_report("vfio: No available IOMMU models\n");
|
| 1542 |
g_free(container); |
| 1543 |
close(fd); |
| 1544 |
return -EINVAL;
|
| 1545 |
} |
| 1546 |
|
| 1547 |
QLIST_INIT(&container->group_list); |
| 1548 |
QLIST_INSERT_HEAD(&container_list, container, next); |
| 1549 |
|
| 1550 |
group->container = container; |
| 1551 |
QLIST_INSERT_HEAD(&container->group_list, group, container_next); |
| 1552 |
|
| 1553 |
return 0; |
| 1554 |
} |
| 1555 |
|
| 1556 |
static void vfio_disconnect_container(VFIOGroup *group) |
| 1557 |
{
|
| 1558 |
VFIOContainer *container = group->container; |
| 1559 |
|
| 1560 |
if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) {
|
| 1561 |
error_report("vfio: error disconnecting group %d from container\n",
|
| 1562 |
group->groupid); |
| 1563 |
} |
| 1564 |
|
| 1565 |
QLIST_REMOVE(group, container_next); |
| 1566 |
group->container = NULL;
|
| 1567 |
|
| 1568 |
if (QLIST_EMPTY(&container->group_list)) {
|
| 1569 |
if (container->iommu_data.release) {
|
| 1570 |
container->iommu_data.release(container); |
| 1571 |
} |
| 1572 |
QLIST_REMOVE(container, next); |
| 1573 |
DPRINTF("vfio_disconnect_container: close container->fd\n");
|
| 1574 |
close(container->fd); |
| 1575 |
g_free(container); |
| 1576 |
} |
| 1577 |
} |
| 1578 |
|
| 1579 |
static VFIOGroup *vfio_get_group(int groupid) |
| 1580 |
{
|
| 1581 |
VFIOGroup *group; |
| 1582 |
char path[32]; |
| 1583 |
struct vfio_group_status status = { .argsz = sizeof(status) }; |
| 1584 |
|
| 1585 |
QLIST_FOREACH(group, &group_list, next) {
|
| 1586 |
if (group->groupid == groupid) {
|
| 1587 |
return group;
|
| 1588 |
} |
| 1589 |
} |
| 1590 |
|
| 1591 |
group = g_malloc0(sizeof(*group));
|
| 1592 |
|
| 1593 |
snprintf(path, sizeof(path), "/dev/vfio/%d", groupid); |
| 1594 |
group->fd = qemu_open(path, O_RDWR); |
| 1595 |
if (group->fd < 0) { |
| 1596 |
error_report("vfio: error opening %s: %m\n", path);
|
| 1597 |
g_free(group); |
| 1598 |
return NULL; |
| 1599 |
} |
| 1600 |
|
| 1601 |
if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) {
|
| 1602 |
error_report("vfio: error getting group status: %m\n");
|
| 1603 |
close(group->fd); |
| 1604 |
g_free(group); |
| 1605 |
return NULL; |
| 1606 |
} |
| 1607 |
|
| 1608 |
if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) {
|
| 1609 |
error_report("vfio: error, group %d is not viable, please ensure "
|
| 1610 |
"all devices within the iommu_group are bound to their "
|
| 1611 |
"vfio bus driver.\n", groupid);
|
| 1612 |
close(group->fd); |
| 1613 |
g_free(group); |
| 1614 |
return NULL; |
| 1615 |
} |
| 1616 |
|
| 1617 |
group->groupid = groupid; |
| 1618 |
QLIST_INIT(&group->device_list); |
| 1619 |
|
| 1620 |
if (vfio_connect_container(group)) {
|
| 1621 |
error_report("vfio: failed to setup container for group %d\n", groupid);
|
| 1622 |
close(group->fd); |
| 1623 |
g_free(group); |
| 1624 |
return NULL; |
| 1625 |
} |
| 1626 |
|
| 1627 |
QLIST_INSERT_HEAD(&group_list, group, next); |
| 1628 |
|
| 1629 |
return group;
|
| 1630 |
} |
| 1631 |
|
| 1632 |
static void vfio_put_group(VFIOGroup *group) |
| 1633 |
{
|
| 1634 |
if (!QLIST_EMPTY(&group->device_list)) {
|
| 1635 |
return;
|
| 1636 |
} |
| 1637 |
|
| 1638 |
vfio_disconnect_container(group); |
| 1639 |
QLIST_REMOVE(group, next); |
| 1640 |
DPRINTF("vfio_put_group: close group->fd\n");
|
| 1641 |
close(group->fd); |
| 1642 |
g_free(group); |
| 1643 |
} |
| 1644 |
|
| 1645 |
static int vfio_get_device(VFIOGroup *group, const char *name, VFIODevice *vdev) |
| 1646 |
{
|
| 1647 |
struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) }; |
| 1648 |
struct vfio_region_info reg_info = { .argsz = sizeof(reg_info) }; |
| 1649 |
int ret, i;
|
| 1650 |
|
| 1651 |
ret = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name); |
| 1652 |
if (ret < 0) { |
| 1653 |
error_report("vfio: error getting device %s from group %d: %m\n",
|
| 1654 |
name, group->groupid); |
| 1655 |
error_report("Verify all devices in group %d are bound to vfio-pci "
|
| 1656 |
"or pci-stub and not already in use\n", group->groupid);
|
| 1657 |
return ret;
|
| 1658 |
} |
| 1659 |
|
| 1660 |
vdev->fd = ret; |
| 1661 |
vdev->group = group; |
| 1662 |
QLIST_INSERT_HEAD(&group->device_list, vdev, next); |
| 1663 |
|
| 1664 |
/* Sanity check device */
|
| 1665 |
ret = ioctl(vdev->fd, VFIO_DEVICE_GET_INFO, &dev_info); |
| 1666 |
if (ret) {
|
| 1667 |
error_report("vfio: error getting device info: %m\n");
|
| 1668 |
goto error;
|
| 1669 |
} |
| 1670 |
|
| 1671 |
DPRINTF("Device %s flags: %u, regions: %u, irgs: %u\n", name,
|
| 1672 |
dev_info.flags, dev_info.num_regions, dev_info.num_irqs); |
| 1673 |
|
| 1674 |
if (!(dev_info.flags & VFIO_DEVICE_FLAGS_PCI)) {
|
| 1675 |
error_report("vfio: Um, this isn't a PCI device\n");
|
| 1676 |
goto error;
|
| 1677 |
} |
| 1678 |
|
| 1679 |
vdev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET); |
| 1680 |
if (!vdev->reset_works) {
|
| 1681 |
error_report("Warning, device %s does not support reset\n", name);
|
| 1682 |
} |
| 1683 |
|
| 1684 |
if (dev_info.num_regions != VFIO_PCI_NUM_REGIONS) {
|
| 1685 |
error_report("vfio: unexpected number of io regions %u\n",
|
| 1686 |
dev_info.num_regions); |
| 1687 |
goto error;
|
| 1688 |
} |
| 1689 |
|
| 1690 |
if (dev_info.num_irqs != VFIO_PCI_NUM_IRQS) {
|
| 1691 |
error_report("vfio: unexpected number of irqs %u\n", dev_info.num_irqs);
|
| 1692 |
goto error;
|
| 1693 |
} |
| 1694 |
|
| 1695 |
for (i = VFIO_PCI_BAR0_REGION_INDEX; i < VFIO_PCI_ROM_REGION_INDEX; i++) {
|
| 1696 |
reg_info.index = i; |
| 1697 |
|
| 1698 |
ret = ioctl(vdev->fd, VFIO_DEVICE_GET_REGION_INFO, ®_info); |
| 1699 |
if (ret) {
|
| 1700 |
error_report("vfio: Error getting region %d info: %m\n", i);
|
| 1701 |
goto error;
|
| 1702 |
} |
| 1703 |
|
| 1704 |
DPRINTF("Device %s region %d:\n", name, i);
|
| 1705 |
DPRINTF(" size: 0x%lx, offset: 0x%lx, flags: 0x%lx\n",
|
| 1706 |
(unsigned long)reg_info.size, (unsigned long)reg_info.offset, |
| 1707 |
(unsigned long)reg_info.flags); |
| 1708 |
|
| 1709 |
vdev->bars[i].flags = reg_info.flags; |
| 1710 |
vdev->bars[i].size = reg_info.size; |
| 1711 |
vdev->bars[i].fd_offset = reg_info.offset; |
| 1712 |
vdev->bars[i].fd = vdev->fd; |
| 1713 |
vdev->bars[i].nr = i; |
| 1714 |
} |
| 1715 |
|
| 1716 |
reg_info.index = VFIO_PCI_ROM_REGION_INDEX; |
| 1717 |
|
| 1718 |
ret = ioctl(vdev->fd, VFIO_DEVICE_GET_REGION_INFO, ®_info); |
| 1719 |
if (ret) {
|
| 1720 |
error_report("vfio: Error getting ROM info: %m\n");
|
| 1721 |
goto error;
|
| 1722 |
} |
| 1723 |
|
| 1724 |
DPRINTF("Device %s ROM:\n", name);
|
| 1725 |
DPRINTF(" size: 0x%lx, offset: 0x%lx, flags: 0x%lx\n",
|
| 1726 |
(unsigned long)reg_info.size, (unsigned long)reg_info.offset, |
| 1727 |
(unsigned long)reg_info.flags); |
| 1728 |
|
| 1729 |
vdev->rom_size = reg_info.size; |
| 1730 |
vdev->rom_offset = reg_info.offset; |
| 1731 |
|
| 1732 |
reg_info.index = VFIO_PCI_CONFIG_REGION_INDEX; |
| 1733 |
|
| 1734 |
ret = ioctl(vdev->fd, VFIO_DEVICE_GET_REGION_INFO, ®_info); |
| 1735 |
if (ret) {
|
| 1736 |
error_report("vfio: Error getting config info: %m\n");
|
| 1737 |
goto error;
|
| 1738 |
} |
| 1739 |
|
| 1740 |
DPRINTF("Device %s config:\n", name);
|
| 1741 |
DPRINTF(" size: 0x%lx, offset: 0x%lx, flags: 0x%lx\n",
|
| 1742 |
(unsigned long)reg_info.size, (unsigned long)reg_info.offset, |
| 1743 |
(unsigned long)reg_info.flags); |
| 1744 |
|
| 1745 |
vdev->config_size = reg_info.size; |
| 1746 |
vdev->config_offset = reg_info.offset; |
| 1747 |
|
| 1748 |
error:
|
| 1749 |
if (ret) {
|
| 1750 |
QLIST_REMOVE(vdev, next); |
| 1751 |
vdev->group = NULL;
|
| 1752 |
close(vdev->fd); |
| 1753 |
} |
| 1754 |
return ret;
|
| 1755 |
} |
| 1756 |
|
| 1757 |
static void vfio_put_device(VFIODevice *vdev) |
| 1758 |
{
|
| 1759 |
QLIST_REMOVE(vdev, next); |
| 1760 |
vdev->group = NULL;
|
| 1761 |
DPRINTF("vfio_put_device: close vdev->fd\n");
|
| 1762 |
close(vdev->fd); |
| 1763 |
if (vdev->msix) {
|
| 1764 |
g_free(vdev->msix); |
| 1765 |
vdev->msix = NULL;
|
| 1766 |
} |
| 1767 |
} |
| 1768 |
|
| 1769 |
static int vfio_initfn(PCIDevice *pdev) |
| 1770 |
{
|
| 1771 |
VFIODevice *pvdev, *vdev = DO_UPCAST(VFIODevice, pdev, pdev); |
| 1772 |
VFIOGroup *group; |
| 1773 |
char path[PATH_MAX], iommu_group_path[PATH_MAX], *group_name;
|
| 1774 |
ssize_t len; |
| 1775 |
struct stat st;
|
| 1776 |
int groupid;
|
| 1777 |
int ret;
|
| 1778 |
|
| 1779 |
/* Check that the host device exists */
|
| 1780 |
snprintf(path, sizeof(path),
|
| 1781 |
"/sys/bus/pci/devices/%04x:%02x:%02x.%01x/",
|
| 1782 |
vdev->host.domain, vdev->host.bus, vdev->host.slot, |
| 1783 |
vdev->host.function); |
| 1784 |
if (stat(path, &st) < 0) { |
| 1785 |
error_report("vfio: error: no such host device: %s\n", path);
|
| 1786 |
return -errno;
|
| 1787 |
} |
| 1788 |
|
| 1789 |
strncat(path, "iommu_group", sizeof(path) - strlen(path) - 1); |
| 1790 |
|
| 1791 |
len = readlink(path, iommu_group_path, PATH_MAX); |
| 1792 |
if (len <= 0) { |
| 1793 |
error_report("vfio: error no iommu_group for device\n");
|
| 1794 |
return -errno;
|
| 1795 |
} |
| 1796 |
|
| 1797 |
iommu_group_path[len] = 0;
|
| 1798 |
group_name = basename(iommu_group_path); |
| 1799 |
|
| 1800 |
if (sscanf(group_name, "%d", &groupid) != 1) { |
| 1801 |
error_report("vfio: error reading %s: %m\n", path);
|
| 1802 |
return -errno;
|
| 1803 |
} |
| 1804 |
|
| 1805 |
DPRINTF("%s(%04x:%02x:%02x.%x) group %d\n", __func__, vdev->host.domain,
|
| 1806 |
vdev->host.bus, vdev->host.slot, vdev->host.function, groupid); |
| 1807 |
|
| 1808 |
group = vfio_get_group(groupid); |
| 1809 |
if (!group) {
|
| 1810 |
error_report("vfio: failed to get group %d\n", groupid);
|
| 1811 |
return -ENOENT;
|
| 1812 |
} |
| 1813 |
|
| 1814 |
snprintf(path, sizeof(path), "%04x:%02x:%02x.%01x", |
| 1815 |
vdev->host.domain, vdev->host.bus, vdev->host.slot, |
| 1816 |
vdev->host.function); |
| 1817 |
|
| 1818 |
QLIST_FOREACH(pvdev, &group->device_list, next) {
|
| 1819 |
if (pvdev->host.domain == vdev->host.domain &&
|
| 1820 |
pvdev->host.bus == vdev->host.bus && |
| 1821 |
pvdev->host.slot == vdev->host.slot && |
| 1822 |
pvdev->host.function == vdev->host.function) {
|
| 1823 |
|
| 1824 |
error_report("vfio: error: device %s is already attached\n", path);
|
| 1825 |
vfio_put_group(group); |
| 1826 |
return -EBUSY;
|
| 1827 |
} |
| 1828 |
} |
| 1829 |
|
| 1830 |
ret = vfio_get_device(group, path, vdev); |
| 1831 |
if (ret) {
|
| 1832 |
error_report("vfio: failed to get device %s\n", path);
|
| 1833 |
vfio_put_group(group); |
| 1834 |
return ret;
|
| 1835 |
} |
| 1836 |
|
| 1837 |
/* Get a copy of config space */
|
| 1838 |
ret = pread(vdev->fd, vdev->pdev.config, |
| 1839 |
MIN(pci_config_size(&vdev->pdev), vdev->config_size), |
| 1840 |
vdev->config_offset); |
| 1841 |
if (ret < (int)MIN(pci_config_size(&vdev->pdev), vdev->config_size)) { |
| 1842 |
ret = ret < 0 ? -errno : -EFAULT;
|
| 1843 |
error_report("vfio: Failed to read device config space\n");
|
| 1844 |
goto out_put;
|
| 1845 |
} |
| 1846 |
|
| 1847 |
/*
|
| 1848 |
* Clear host resource mapping info. If we choose not to register a
|
| 1849 |
* BAR, such as might be the case with the option ROM, we can get
|
| 1850 |
* confusing, unwritable, residual addresses from the host here.
|
| 1851 |
*/
|
| 1852 |
memset(&vdev->pdev.config[PCI_BASE_ADDRESS_0], 0, 24); |
| 1853 |
memset(&vdev->pdev.config[PCI_ROM_ADDRESS], 0, 4); |
| 1854 |
|
| 1855 |
vfio_load_rom(vdev); |
| 1856 |
|
| 1857 |
ret = vfio_early_setup_msix(vdev); |
| 1858 |
if (ret) {
|
| 1859 |
goto out_put;
|
| 1860 |
} |
| 1861 |
|
| 1862 |
vfio_map_bars(vdev); |
| 1863 |
|
| 1864 |
ret = vfio_add_capabilities(vdev); |
| 1865 |
if (ret) {
|
| 1866 |
goto out_teardown;
|
| 1867 |
} |
| 1868 |
|
| 1869 |
if (vfio_pci_read_config(&vdev->pdev, PCI_INTERRUPT_PIN, 1)) { |
| 1870 |
vdev->intx.mmap_timer = qemu_new_timer_ms(vm_clock, |
| 1871 |
vfio_intx_mmap_enable, vdev); |
| 1872 |
ret = vfio_enable_intx(vdev); |
| 1873 |
if (ret) {
|
| 1874 |
goto out_teardown;
|
| 1875 |
} |
| 1876 |
} |
| 1877 |
|
| 1878 |
return 0; |
| 1879 |
|
| 1880 |
out_teardown:
|
| 1881 |
pci_device_set_intx_routing_notifier(&vdev->pdev, NULL);
|
| 1882 |
vfio_teardown_msi(vdev); |
| 1883 |
vfio_unmap_bars(vdev); |
| 1884 |
out_put:
|
| 1885 |
vfio_put_device(vdev); |
| 1886 |
vfio_put_group(group); |
| 1887 |
return ret;
|
| 1888 |
} |
| 1889 |
|
| 1890 |
static void vfio_exitfn(PCIDevice *pdev) |
| 1891 |
{
|
| 1892 |
VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev); |
| 1893 |
VFIOGroup *group = vdev->group; |
| 1894 |
|
| 1895 |
pci_device_set_intx_routing_notifier(&vdev->pdev, NULL);
|
| 1896 |
vfio_disable_interrupts(vdev); |
| 1897 |
if (vdev->intx.mmap_timer) {
|
| 1898 |
qemu_free_timer(vdev->intx.mmap_timer); |
| 1899 |
} |
| 1900 |
vfio_teardown_msi(vdev); |
| 1901 |
vfio_unmap_bars(vdev); |
| 1902 |
vfio_put_device(vdev); |
| 1903 |
vfio_put_group(group); |
| 1904 |
} |
| 1905 |
|
| 1906 |
static void vfio_pci_reset(DeviceState *dev) |
| 1907 |
{
|
| 1908 |
PCIDevice *pdev = DO_UPCAST(PCIDevice, qdev, dev); |
| 1909 |
VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev); |
| 1910 |
uint16_t cmd; |
| 1911 |
|
| 1912 |
DPRINTF("%s(%04x:%02x:%02x.%x)\n", __func__, vdev->host.domain,
|
| 1913 |
vdev->host.bus, vdev->host.slot, vdev->host.function); |
| 1914 |
|
| 1915 |
vfio_disable_interrupts(vdev); |
| 1916 |
|
| 1917 |
/*
|
| 1918 |
* Stop any ongoing DMA by disconecting I/O, MMIO, and bus master.
|
| 1919 |
* Also put INTx Disable in known state.
|
| 1920 |
*/
|
| 1921 |
cmd = vfio_pci_read_config(pdev, PCI_COMMAND, 2);
|
| 1922 |
cmd &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | |
| 1923 |
PCI_COMMAND_INTX_DISABLE); |
| 1924 |
vfio_pci_write_config(pdev, PCI_COMMAND, cmd, 2);
|
| 1925 |
|
| 1926 |
if (vdev->reset_works) {
|
| 1927 |
if (ioctl(vdev->fd, VFIO_DEVICE_RESET)) {
|
| 1928 |
error_report("vfio: Error unable to reset physical device "
|
| 1929 |
"(%04x:%02x:%02x.%x): %m\n", vdev->host.domain,
|
| 1930 |
vdev->host.bus, vdev->host.slot, vdev->host.function); |
| 1931 |
} |
| 1932 |
} |
| 1933 |
|
| 1934 |
vfio_enable_intx(vdev); |
| 1935 |
} |
| 1936 |
|
| 1937 |
static Property vfio_pci_dev_properties[] = {
|
| 1938 |
DEFINE_PROP_PCI_HOST_DEVADDR("host", VFIODevice, host),
|
| 1939 |
DEFINE_PROP_UINT32("x-intx-mmap-timeout-ms", VFIODevice,
|
| 1940 |
intx.mmap_timeout, 1100),
|
| 1941 |
/*
|
| 1942 |
* TODO - support passed fds... is this necessary?
|
| 1943 |
* DEFINE_PROP_STRING("vfiofd", VFIODevice, vfiofd_name),
|
| 1944 |
* DEFINE_PROP_STRING("vfiogroupfd, VFIODevice, vfiogroupfd_name),
|
| 1945 |
*/
|
| 1946 |
DEFINE_PROP_END_OF_LIST(), |
| 1947 |
}; |
| 1948 |
|
| 1949 |
static const VMStateDescription vfio_pci_vmstate = { |
| 1950 |
.name = "vfio-pci",
|
| 1951 |
.unmigratable = 1,
|
| 1952 |
}; |
| 1953 |
|
| 1954 |
static void vfio_pci_dev_class_init(ObjectClass *klass, void *data) |
| 1955 |
{
|
| 1956 |
DeviceClass *dc = DEVICE_CLASS(klass); |
| 1957 |
PCIDeviceClass *pdc = PCI_DEVICE_CLASS(klass); |
| 1958 |
|
| 1959 |
dc->reset = vfio_pci_reset; |
| 1960 |
dc->props = vfio_pci_dev_properties; |
| 1961 |
dc->vmsd = &vfio_pci_vmstate; |
| 1962 |
dc->desc = "VFIO-based PCI device assignment";
|
| 1963 |
pdc->init = vfio_initfn; |
| 1964 |
pdc->exit = vfio_exitfn; |
| 1965 |
pdc->config_read = vfio_pci_read_config; |
| 1966 |
pdc->config_write = vfio_pci_write_config; |
| 1967 |
} |
| 1968 |
|
| 1969 |
static const TypeInfo vfio_pci_dev_info = { |
| 1970 |
.name = "vfio-pci",
|
| 1971 |
.parent = TYPE_PCI_DEVICE, |
| 1972 |
.instance_size = sizeof(VFIODevice),
|
| 1973 |
.class_init = vfio_pci_dev_class_init, |
| 1974 |
}; |
| 1975 |
|
| 1976 |
static void register_vfio_pci_dev_type(void) |
| 1977 |
{
|
| 1978 |
type_register_static(&vfio_pci_dev_info); |
| 1979 |
} |
| 1980 |
|
| 1981 |
type_init(register_vfio_pci_dev_type) |