root / hw / vfio_pci.c @ fa2ddcb4
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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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#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 "qemu-error.h" |
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#include "range.h" |
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#include "vfio_pci_int.h" |
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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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#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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* 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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vdev->interrupt = VFIO_INT_NONE; |
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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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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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} |
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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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typedef struct QEMU_PACKED VFIOIRQSetFD { |
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struct vfio_irq_set irq_set;
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int32_t fd; |
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} VFIOIRQSetFD; |
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static int vfio_enable_intx(VFIODevice *vdev) |
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{ |
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VFIOIRQSetFD irq_set_fd = { |
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.irq_set = { |
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.argsz = sizeof(irq_set_fd),
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.flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER, |
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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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}; |
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uint8_t pin = vfio_pci_read_config(&vdev->pdev, PCI_INTERRUPT_PIN, 1);
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int ret;
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if (vdev->intx.disabled || !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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irq_set_fd.fd = event_notifier_get_fd(&vdev->intx.interrupt); |
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qemu_set_fd_handler(irq_set_fd.fd, vfio_intx_interrupt, NULL, vdev);
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if (ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, &irq_set_fd)) {
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error_report("vfio: Error: Failed to setup INTx fd: %m\n");
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return -errno;
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} |
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/*
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* Disable mmaps so we can trap on BAR accesses. We interpret any
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* access as a response to an interrupt and unmask the physical
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* device. The device will re-assert if the interrupt is still
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* pending. We'll likely retrigger on the host multiple times per
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* guest interrupt, but without EOI notification it's better than
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* nothing. Acceleration paths through KVM will avoid this.
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*/
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vfio_mmap_set_enabled(vdev, false);
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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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static void vfio_disable_intx(VFIODevice *vdev) |
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{ |
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int fd;
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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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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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vdev->interrupt = VFIO_INT_NONE; |
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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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* 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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if (!event_notifier_test_and_clear(&vector->interrupt)) {
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return;
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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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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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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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argsz = sizeof(*irq_set) + (vdev->nr_vectors * sizeof(*fds)); |
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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 = 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; |
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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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fds[i] = event_notifier_get_fd(&vdev->msi_vectors[i].interrupt); |
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} |
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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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vdev->interrupt = msix ? VFIO_INT_MSIX : VFIO_INT_MSI; |
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} |
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return ret;
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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) |
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{ |
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VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev); |
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VFIOMSIVector *vector; |
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int ret;
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DPRINTF("%s(%04x:%02x:%02x.%x) vector %d used\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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if (vdev->interrupt != VFIO_INT_MSIX) {
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vfio_disable_interrupts(vdev); |
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} |
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if (!vdev->msi_vectors) {
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vdev->msi_vectors = g_malloc0(vdev->msix->entries * |
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sizeof(VFIOMSIVector));
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} |
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vector = &vdev->msi_vectors[nr]; |
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vector->vdev = vdev; |
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vector->use = true;
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msix_vector_use(pdev, nr); |
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if (event_notifier_init(&vector->interrupt, 0)) { |
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error_report("vfio: Error: event_notifier_init failed\n");
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} |
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/*
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* Attempt to enable route through KVM irqchip,
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* default to userspace handling if unavailable.
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*/
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vector->virq = kvm_irqchip_add_msi_route(kvm_state, msg); |
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if (vector->virq < 0 || |
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kvm_irqchip_add_irqfd_notifier(kvm_state, &vector->interrupt, |
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vector->virq) < 0) {
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if (vector->virq >= 0) { |
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kvm_irqchip_release_virq(kvm_state, vector->virq); |
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vector->virq = -1;
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} |
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qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt), |
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vfio_msi_interrupt, NULL, vector);
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} |
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/*
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* We don't want to have the host allocate all possible MSI vectors
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* for a device if they're not in use, so we shutdown and incrementally
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* increase them as needed.
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*/
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if (vdev->nr_vectors < nr + 1) { |
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int i;
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vfio_disable_irqindex(vdev, VFIO_PCI_MSIX_IRQ_INDEX); |
319 |
vdev->nr_vectors = nr + 1;
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ret = vfio_enable_vectors(vdev, true);
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if (ret) {
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error_report("vfio: failed to enable vectors, %d\n", ret);
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} |
324 |
|
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/* We don't know if we've missed interrupts in the interim... */
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for (i = 0; i < vdev->msix->entries; i++) { |
327 |
if (vdev->msi_vectors[i].use) {
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msix_notify(&vdev->pdev, i); |
329 |
} |
330 |
} |
331 |
} else {
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VFIOIRQSetFD irq_set_fd = { |
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.irq_set = { |
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.argsz = sizeof(irq_set_fd),
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.flags = VFIO_IRQ_SET_DATA_EVENTFD | |
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VFIO_IRQ_SET_ACTION_TRIGGER, |
337 |
.index = VFIO_PCI_MSIX_IRQ_INDEX, |
338 |
.start = nr, |
339 |
.count = 1,
|
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}, |
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.fd = event_notifier_get_fd(&vector->interrupt), |
342 |
}; |
343 |
ret = ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, &irq_set_fd); |
344 |
if (ret) {
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error_report("vfio: failed to modify vector, %d\n", ret);
|
346 |
} |
347 |
|
348 |
/*
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349 |
* If we were connected to the hardware PBA we could skip this,
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350 |
* until then, a spurious interrupt is better than starvation.
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*/
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msix_notify(&vdev->pdev, nr); |
353 |
} |
354 |
|
355 |
return 0; |
356 |
} |
357 |
|
358 |
static void vfio_msix_vector_release(PCIDevice *pdev, unsigned int nr) |
359 |
{ |
360 |
VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev); |
361 |
VFIOMSIVector *vector = &vdev->msi_vectors[nr]; |
362 |
VFIOIRQSetFD irq_set_fd = { |
363 |
.irq_set = { |
364 |
.argsz = sizeof(irq_set_fd),
|
365 |
.flags = VFIO_IRQ_SET_DATA_EVENTFD | |
366 |
VFIO_IRQ_SET_ACTION_TRIGGER, |
367 |
.index = VFIO_PCI_MSIX_IRQ_INDEX, |
368 |
.start = nr, |
369 |
.count = 1,
|
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}, |
371 |
.fd = -1,
|
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}; |
373 |
|
374 |
DPRINTF("%s(%04x:%02x:%02x.%x) vector %d released\n", __func__,
|
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vdev->host.domain, vdev->host.bus, vdev->host.slot, |
376 |
vdev->host.function, nr); |
377 |
|
378 |
/*
|
379 |
* XXX What's the right thing to do here? This turns off the interrupt
|
380 |
* completely, but do we really just want to switch the interrupt to
|
381 |
* bouncing through userspace and let msix.c drop it? Not sure.
|
382 |
*/
|
383 |
msix_vector_unuse(pdev, nr); |
384 |
ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, &irq_set_fd); |
385 |
|
386 |
if (vector->virq < 0) { |
387 |
qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt), |
388 |
NULL, NULL, NULL); |
389 |
} else {
|
390 |
kvm_irqchip_remove_irqfd_notifier(kvm_state, &vector->interrupt, |
391 |
vector->virq); |
392 |
kvm_irqchip_release_virq(kvm_state, vector->virq); |
393 |
vector->virq = -1;
|
394 |
} |
395 |
|
396 |
event_notifier_cleanup(&vector->interrupt); |
397 |
vector->use = false;
|
398 |
} |
399 |
|
400 |
/* TODO This should move to msi.c */
|
401 |
static MSIMessage msi_get_msg(PCIDevice *pdev, unsigned int vector) |
402 |
{ |
403 |
uint16_t flags = pci_get_word(pdev->config + pdev->msi_cap + PCI_MSI_FLAGS); |
404 |
bool msi64bit = flags & PCI_MSI_FLAGS_64BIT;
|
405 |
MSIMessage msg; |
406 |
|
407 |
if (msi64bit) {
|
408 |
msg.address = pci_get_quad(pdev->config + |
409 |
pdev->msi_cap + PCI_MSI_ADDRESS_LO); |
410 |
} else {
|
411 |
msg.address = pci_get_long(pdev->config + |
412 |
pdev->msi_cap + PCI_MSI_ADDRESS_LO); |
413 |
} |
414 |
|
415 |
msg.data = pci_get_word(pdev->config + pdev->msi_cap + |
416 |
(msi64bit ? PCI_MSI_DATA_64 : PCI_MSI_DATA_32)); |
417 |
msg.data += vector; |
418 |
|
419 |
return msg;
|
420 |
} |
421 |
|
422 |
/* So should this */
|
423 |
static void msi_set_qsize(PCIDevice *pdev, uint8_t size) |
424 |
{ |
425 |
uint8_t *config = pdev->config + pdev->msi_cap; |
426 |
uint16_t flags; |
427 |
|
428 |
flags = pci_get_word(config + PCI_MSI_FLAGS); |
429 |
flags = le16_to_cpu(flags); |
430 |
flags &= ~PCI_MSI_FLAGS_QSIZE; |
431 |
flags |= (size & 0x7) << 4; |
432 |
flags = cpu_to_le16(flags); |
433 |
pci_set_word(config + PCI_MSI_FLAGS, flags); |
434 |
} |
435 |
|
436 |
static void vfio_enable_msi(VFIODevice *vdev) |
437 |
{ |
438 |
int ret, i;
|
439 |
|
440 |
vfio_disable_interrupts(vdev); |
441 |
|
442 |
vdev->nr_vectors = msi_nr_vectors_allocated(&vdev->pdev); |
443 |
retry:
|
444 |
vdev->msi_vectors = g_malloc0(vdev->nr_vectors * sizeof(VFIOMSIVector));
|
445 |
|
446 |
for (i = 0; i < vdev->nr_vectors; i++) { |
447 |
MSIMessage msg; |
448 |
VFIOMSIVector *vector = &vdev->msi_vectors[i]; |
449 |
|
450 |
vector->vdev = vdev; |
451 |
vector->use = true;
|
452 |
|
453 |
if (event_notifier_init(&vector->interrupt, 0)) { |
454 |
error_report("vfio: Error: event_notifier_init failed\n");
|
455 |
} |
456 |
|
457 |
msg = msi_get_msg(&vdev->pdev, i); |
458 |
|
459 |
/*
|
460 |
* Attempt to enable route through KVM irqchip,
|
461 |
* default to userspace handling if unavailable.
|
462 |
*/
|
463 |
vector->virq = kvm_irqchip_add_msi_route(kvm_state, msg); |
464 |
if (vector->virq < 0 || |
465 |
kvm_irqchip_add_irqfd_notifier(kvm_state, &vector->interrupt, |
466 |
vector->virq) < 0) {
|
467 |
qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt), |
468 |
vfio_msi_interrupt, NULL, vector);
|
469 |
} |
470 |
} |
471 |
|
472 |
ret = vfio_enable_vectors(vdev, false);
|
473 |
if (ret) {
|
474 |
if (ret < 0) { |
475 |
error_report("vfio: Error: Failed to setup MSI fds: %m\n");
|
476 |
} else if (ret != vdev->nr_vectors) { |
477 |
error_report("vfio: Error: Failed to enable %d "
|
478 |
"MSI vectors, retry with %d\n", vdev->nr_vectors, ret);
|
479 |
} |
480 |
|
481 |
for (i = 0; i < vdev->nr_vectors; i++) { |
482 |
VFIOMSIVector *vector = &vdev->msi_vectors[i]; |
483 |
if (vector->virq >= 0) { |
484 |
kvm_irqchip_remove_irqfd_notifier(kvm_state, &vector->interrupt, |
485 |
vector->virq); |
486 |
kvm_irqchip_release_virq(kvm_state, vector->virq); |
487 |
vector->virq = -1;
|
488 |
} else {
|
489 |
qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt), |
490 |
NULL, NULL, NULL); |
491 |
} |
492 |
event_notifier_cleanup(&vector->interrupt); |
493 |
} |
494 |
|
495 |
g_free(vdev->msi_vectors); |
496 |
|
497 |
if (ret > 0 && ret != vdev->nr_vectors) { |
498 |
vdev->nr_vectors = ret; |
499 |
goto retry;
|
500 |
} |
501 |
vdev->nr_vectors = 0;
|
502 |
|
503 |
return;
|
504 |
} |
505 |
|
506 |
msi_set_qsize(&vdev->pdev, vdev->nr_vectors); |
507 |
|
508 |
DPRINTF("%s(%04x:%02x:%02x.%x) Enabled %d MSI vectors\n", __func__,
|
509 |
vdev->host.domain, vdev->host.bus, vdev->host.slot, |
510 |
vdev->host.function, vdev->nr_vectors); |
511 |
} |
512 |
|
513 |
static void vfio_disable_msi_x(VFIODevice *vdev, bool msix) |
514 |
{ |
515 |
int i;
|
516 |
|
517 |
vfio_disable_irqindex(vdev, msix ? VFIO_PCI_MSIX_IRQ_INDEX : |
518 |
VFIO_PCI_MSI_IRQ_INDEX); |
519 |
|
520 |
for (i = 0; i < vdev->nr_vectors; i++) { |
521 |
VFIOMSIVector *vector = &vdev->msi_vectors[i]; |
522 |
|
523 |
if (!vector->use) {
|
524 |
continue;
|
525 |
} |
526 |
|
527 |
if (vector->virq >= 0) { |
528 |
kvm_irqchip_remove_irqfd_notifier(kvm_state, |
529 |
&vector->interrupt, vector->virq); |
530 |
kvm_irqchip_release_virq(kvm_state, vector->virq); |
531 |
vector->virq = -1;
|
532 |
} else {
|
533 |
qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt), |
534 |
NULL, NULL, NULL); |
535 |
} |
536 |
|
537 |
if (msix) {
|
538 |
msix_vector_unuse(&vdev->pdev, i); |
539 |
} |
540 |
|
541 |
event_notifier_cleanup(&vector->interrupt); |
542 |
} |
543 |
|
544 |
g_free(vdev->msi_vectors); |
545 |
vdev->msi_vectors = NULL;
|
546 |
vdev->nr_vectors = 0;
|
547 |
|
548 |
if (!msix) {
|
549 |
msi_set_qsize(&vdev->pdev, 0); /* Actually still means 1 vector */ |
550 |
} |
551 |
|
552 |
DPRINTF("%s(%04x:%02x:%02x.%x, msi%s)\n", __func__,
|
553 |
vdev->host.domain, vdev->host.bus, vdev->host.slot, |
554 |
vdev->host.function, msix ? "x" : ""); |
555 |
|
556 |
vfio_enable_intx(vdev); |
557 |
} |
558 |
|
559 |
/*
|
560 |
* IO Port/MMIO - Beware of the endians, VFIO is always little endian
|
561 |
*/
|
562 |
static void vfio_bar_write(void *opaque, target_phys_addr_t addr, |
563 |
uint64_t data, unsigned size)
|
564 |
{ |
565 |
VFIOBAR *bar = opaque; |
566 |
union {
|
567 |
uint8_t byte; |
568 |
uint16_t word; |
569 |
uint32_t dword; |
570 |
uint64_t qword; |
571 |
} buf; |
572 |
|
573 |
switch (size) {
|
574 |
case 1: |
575 |
buf.byte = data; |
576 |
break;
|
577 |
case 2: |
578 |
buf.word = cpu_to_le16(data); |
579 |
break;
|
580 |
case 4: |
581 |
buf.dword = cpu_to_le32(data); |
582 |
break;
|
583 |
default:
|
584 |
hw_error("vfio: unsupported write size, %d bytes\n", size);
|
585 |
break;
|
586 |
} |
587 |
|
588 |
if (pwrite(bar->fd, &buf, size, bar->fd_offset + addr) != size) {
|
589 |
error_report("%s(,0x%"TARGET_PRIxPHYS", 0x%"PRIx64", %d) failed: %m\n", |
590 |
__func__, addr, data, size); |
591 |
} |
592 |
|
593 |
DPRINTF("%s(BAR%d+0x%"TARGET_PRIxPHYS", 0x%"PRIx64", %d)\n", |
594 |
__func__, bar->nr, addr, data, size); |
595 |
|
596 |
/*
|
597 |
* A read or write to a BAR always signals an INTx EOI. This will
|
598 |
* do nothing if not pending (including not in INTx mode). We assume
|
599 |
* that a BAR access is in response to an interrupt and that BAR
|
600 |
* accesses will service the interrupt. Unfortunately, we don't know
|
601 |
* which access will service the interrupt, so we're potentially
|
602 |
* getting quite a few host interrupts per guest interrupt.
|
603 |
*/
|
604 |
vfio_eoi(DO_UPCAST(VFIODevice, bars[bar->nr], bar)); |
605 |
} |
606 |
|
607 |
static uint64_t vfio_bar_read(void *opaque, |
608 |
target_phys_addr_t addr, unsigned size)
|
609 |
{ |
610 |
VFIOBAR *bar = opaque; |
611 |
union {
|
612 |
uint8_t byte; |
613 |
uint16_t word; |
614 |
uint32_t dword; |
615 |
uint64_t qword; |
616 |
} buf; |
617 |
uint64_t data = 0;
|
618 |
|
619 |
if (pread(bar->fd, &buf, size, bar->fd_offset + addr) != size) {
|
620 |
error_report("%s(,0x%"TARGET_PRIxPHYS", %d) failed: %m\n", |
621 |
__func__, addr, size); |
622 |
return (uint64_t)-1; |
623 |
} |
624 |
|
625 |
switch (size) {
|
626 |
case 1: |
627 |
data = buf.byte; |
628 |
break;
|
629 |
case 2: |
630 |
data = le16_to_cpu(buf.word); |
631 |
break;
|
632 |
case 4: |
633 |
data = le32_to_cpu(buf.dword); |
634 |
break;
|
635 |
default:
|
636 |
hw_error("vfio: unsupported read size, %d bytes\n", size);
|
637 |
break;
|
638 |
} |
639 |
|
640 |
DPRINTF("%s(BAR%d+0x%"TARGET_PRIxPHYS", %d) = 0x%"PRIx64"\n", |
641 |
__func__, bar->nr, addr, size, data); |
642 |
|
643 |
/* Same as write above */
|
644 |
vfio_eoi(DO_UPCAST(VFIODevice, bars[bar->nr], bar)); |
645 |
|
646 |
return data;
|
647 |
} |
648 |
|
649 |
static const MemoryRegionOps vfio_bar_ops = { |
650 |
.read = vfio_bar_read, |
651 |
.write = vfio_bar_write, |
652 |
.endianness = DEVICE_LITTLE_ENDIAN, |
653 |
}; |
654 |
|
655 |
/*
|
656 |
* PCI config space
|
657 |
*/
|
658 |
static uint32_t vfio_pci_read_config(PCIDevice *pdev, uint32_t addr, int len) |
659 |
{ |
660 |
VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev); |
661 |
uint32_t val = 0;
|
662 |
|
663 |
/*
|
664 |
* We only need QEMU PCI config support for the ROM BAR, the MSI and MSIX
|
665 |
* capabilities, and the multifunction bit below. We let VFIO handle
|
666 |
* virtualizing everything else. Performance is not a concern here.
|
667 |
*/
|
668 |
if (ranges_overlap(addr, len, PCI_ROM_ADDRESS, 4) || |
669 |
(pdev->cap_present & QEMU_PCI_CAP_MSIX && |
670 |
ranges_overlap(addr, len, pdev->msix_cap, MSIX_CAP_LENGTH)) || |
671 |
(pdev->cap_present & QEMU_PCI_CAP_MSI && |
672 |
ranges_overlap(addr, len, pdev->msi_cap, vdev->msi_cap_size))) { |
673 |
|
674 |
val = pci_default_read_config(pdev, addr, len); |
675 |
} else {
|
676 |
if (pread(vdev->fd, &val, len, vdev->config_offset + addr) != len) {
|
677 |
error_report("%s(%04x:%02x:%02x.%x, 0x%x, 0x%x) failed: %m\n",
|
678 |
__func__, vdev->host.domain, vdev->host.bus, |
679 |
vdev->host.slot, vdev->host.function, addr, len); |
680 |
return -errno;
|
681 |
} |
682 |
val = le32_to_cpu(val); |
683 |
} |
684 |
|
685 |
/* Multifunction bit is virualized in QEMU */
|
686 |
if (unlikely(ranges_overlap(addr, len, PCI_HEADER_TYPE, 1))) { |
687 |
uint32_t mask = PCI_HEADER_TYPE_MULTI_FUNCTION; |
688 |
|
689 |
if (len == 4) { |
690 |
mask <<= 16;
|
691 |
} |
692 |
|
693 |
if (pdev->cap_present & QEMU_PCI_CAP_MULTIFUNCTION) {
|
694 |
val |= mask; |
695 |
} else {
|
696 |
val &= ~mask; |
697 |
} |
698 |
} |
699 |
|
700 |
DPRINTF("%s(%04x:%02x:%02x.%x, @0x%x, len=0x%x) %x\n", __func__,
|
701 |
vdev->host.domain, vdev->host.bus, vdev->host.slot, |
702 |
vdev->host.function, addr, len, val); |
703 |
|
704 |
return val;
|
705 |
} |
706 |
|
707 |
static void vfio_pci_write_config(PCIDevice *pdev, uint32_t addr, |
708 |
uint32_t val, int len)
|
709 |
{ |
710 |
VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev); |
711 |
uint32_t val_le = cpu_to_le32(val); |
712 |
|
713 |
DPRINTF("%s(%04x:%02x:%02x.%x, @0x%x, 0x%x, len=0x%x)\n", __func__,
|
714 |
vdev->host.domain, vdev->host.bus, vdev->host.slot, |
715 |
vdev->host.function, addr, val, len); |
716 |
|
717 |
/* Write everything to VFIO, let it filter out what we can't write */
|
718 |
if (pwrite(vdev->fd, &val_le, len, vdev->config_offset + addr) != len) {
|
719 |
error_report("%s(%04x:%02x:%02x.%x, 0x%x, 0x%x, 0x%x) failed: %m\n",
|
720 |
__func__, vdev->host.domain, vdev->host.bus, |
721 |
vdev->host.slot, vdev->host.function, addr, val, len); |
722 |
} |
723 |
|
724 |
/* Write standard header bits to emulation */
|
725 |
if (addr < PCI_CONFIG_HEADER_SIZE) {
|
726 |
pci_default_write_config(pdev, addr, val, len); |
727 |
return;
|
728 |
} |
729 |
|
730 |
/* MSI/MSI-X Enabling/Disabling */
|
731 |
if (pdev->cap_present & QEMU_PCI_CAP_MSI &&
|
732 |
ranges_overlap(addr, len, pdev->msi_cap, vdev->msi_cap_size)) { |
733 |
int is_enabled, was_enabled = msi_enabled(pdev);
|
734 |
|
735 |
pci_default_write_config(pdev, addr, val, len); |
736 |
|
737 |
is_enabled = msi_enabled(pdev); |
738 |
|
739 |
if (!was_enabled && is_enabled) {
|
740 |
vfio_enable_msi(vdev); |
741 |
} else if (was_enabled && !is_enabled) { |
742 |
vfio_disable_msi_x(vdev, false);
|
743 |
} |
744 |
} |
745 |
|
746 |
if (pdev->cap_present & QEMU_PCI_CAP_MSIX &&
|
747 |
ranges_overlap(addr, len, pdev->msix_cap, MSIX_CAP_LENGTH)) { |
748 |
int is_enabled, was_enabled = msix_enabled(pdev);
|
749 |
|
750 |
pci_default_write_config(pdev, addr, val, len); |
751 |
|
752 |
is_enabled = msix_enabled(pdev); |
753 |
|
754 |
if (!was_enabled && is_enabled) {
|
755 |
/* vfio_msix_vector_use handles this automatically */
|
756 |
} else if (was_enabled && !is_enabled) { |
757 |
vfio_disable_msi_x(vdev, true);
|
758 |
} |
759 |
} |
760 |
} |
761 |
|
762 |
/*
|
763 |
* DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86
|
764 |
*/
|
765 |
static int vfio_dma_map(VFIOContainer *container, target_phys_addr_t iova, |
766 |
ram_addr_t size, void *vaddr, bool readonly) |
767 |
{ |
768 |
struct vfio_iommu_type1_dma_map map = {
|
769 |
.argsz = sizeof(map),
|
770 |
.flags = VFIO_DMA_MAP_FLAG_READ, |
771 |
.vaddr = (__u64)(intptr_t)vaddr, |
772 |
.iova = iova, |
773 |
.size = size, |
774 |
}; |
775 |
|
776 |
if (!readonly) {
|
777 |
map.flags |= VFIO_DMA_MAP_FLAG_WRITE; |
778 |
} |
779 |
|
780 |
if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map)) {
|
781 |
DPRINTF("VFIO_MAP_DMA: %d\n", -errno);
|
782 |
return -errno;
|
783 |
} |
784 |
|
785 |
return 0; |
786 |
} |
787 |
|
788 |
static int vfio_dma_unmap(VFIOContainer *container, |
789 |
target_phys_addr_t iova, ram_addr_t size) |
790 |
{ |
791 |
struct vfio_iommu_type1_dma_unmap unmap = {
|
792 |
.argsz = sizeof(unmap),
|
793 |
.flags = 0,
|
794 |
.iova = iova, |
795 |
.size = size, |
796 |
}; |
797 |
|
798 |
if (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
|
799 |
DPRINTF("VFIO_UNMAP_DMA: %d\n", -errno);
|
800 |
return -errno;
|
801 |
} |
802 |
|
803 |
return 0; |
804 |
} |
805 |
|
806 |
static void vfio_listener_dummy1(MemoryListener *listener) |
807 |
{ |
808 |
/* We don't do batching (begin/commit) or care about logging */
|
809 |
} |
810 |
|
811 |
static void vfio_listener_dummy2(MemoryListener *listener, |
812 |
MemoryRegionSection *section) |
813 |
{ |
814 |
/* We don't do logging or care about nops */
|
815 |
} |
816 |
|
817 |
static void vfio_listener_dummy3(MemoryListener *listener, |
818 |
MemoryRegionSection *section, |
819 |
bool match_data, uint64_t data,
|
820 |
EventNotifier *e) |
821 |
{ |
822 |
/* We don't care about eventfds */
|
823 |
} |
824 |
|
825 |
static bool vfio_listener_skipped_section(MemoryRegionSection *section) |
826 |
{ |
827 |
return !memory_region_is_ram(section->mr);
|
828 |
} |
829 |
|
830 |
static void vfio_listener_region_add(MemoryListener *listener, |
831 |
MemoryRegionSection *section) |
832 |
{ |
833 |
VFIOContainer *container = container_of(listener, VFIOContainer, |
834 |
iommu_data.listener); |
835 |
target_phys_addr_t iova, end; |
836 |
void *vaddr;
|
837 |
int ret;
|
838 |
|
839 |
if (vfio_listener_skipped_section(section)) {
|
840 |
DPRINTF("vfio: SKIPPING region_add %"TARGET_PRIxPHYS" - %"PRIx64"\n", |
841 |
section->offset_within_address_space, |
842 |
section->offset_within_address_space + section->size - 1);
|
843 |
return;
|
844 |
} |
845 |
|
846 |
if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) !=
|
847 |
(section->offset_within_region & ~TARGET_PAGE_MASK))) { |
848 |
error_report("%s received unaligned region\n", __func__);
|
849 |
return;
|
850 |
} |
851 |
|
852 |
iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); |
853 |
end = (section->offset_within_address_space + section->size) & |
854 |
TARGET_PAGE_MASK; |
855 |
|
856 |
if (iova >= end) {
|
857 |
return;
|
858 |
} |
859 |
|
860 |
vaddr = memory_region_get_ram_ptr(section->mr) + |
861 |
section->offset_within_region + |
862 |
(iova - section->offset_within_address_space); |
863 |
|
864 |
DPRINTF("vfio: region_add %"TARGET_PRIxPHYS" - %"TARGET_PRIxPHYS" [%p]\n", |
865 |
iova, end - 1, vaddr);
|
866 |
|
867 |
ret = vfio_dma_map(container, iova, end - iova, vaddr, section->readonly); |
868 |
if (ret) {
|
869 |
error_report("vfio_dma_map(%p, 0x%"TARGET_PRIxPHYS", " |
870 |
"0x%"TARGET_PRIxPHYS", %p) = %d (%m)\n", |
871 |
container, iova, end - iova, vaddr, ret); |
872 |
} |
873 |
} |
874 |
|
875 |
static void vfio_listener_region_del(MemoryListener *listener, |
876 |
MemoryRegionSection *section) |
877 |
{ |
878 |
VFIOContainer *container = container_of(listener, VFIOContainer, |
879 |
iommu_data.listener); |
880 |
target_phys_addr_t iova, end; |
881 |
int ret;
|
882 |
|
883 |
if (vfio_listener_skipped_section(section)) {
|
884 |
DPRINTF("vfio: SKIPPING region_del %"TARGET_PRIxPHYS" - %"PRIx64"\n", |
885 |
section->offset_within_address_space, |
886 |
section->offset_within_address_space + section->size - 1);
|
887 |
return;
|
888 |
} |
889 |
|
890 |
if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) !=
|
891 |
(section->offset_within_region & ~TARGET_PAGE_MASK))) { |
892 |
error_report("%s received unaligned region\n", __func__);
|
893 |
return;
|
894 |
} |
895 |
|
896 |
iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); |
897 |
end = (section->offset_within_address_space + section->size) & |
898 |
TARGET_PAGE_MASK; |
899 |
|
900 |
if (iova >= end) {
|
901 |
return;
|
902 |
} |
903 |
|
904 |
DPRINTF("vfio: region_del %"TARGET_PRIxPHYS" - %"TARGET_PRIxPHYS"\n", |
905 |
iova, end - 1);
|
906 |
|
907 |
ret = vfio_dma_unmap(container, iova, end - iova); |
908 |
if (ret) {
|
909 |
error_report("vfio_dma_unmap(%p, 0x%"TARGET_PRIxPHYS", " |
910 |
"0x%"TARGET_PRIxPHYS") = %d (%m)\n", |
911 |
container, iova, end - iova, ret); |
912 |
} |
913 |
} |
914 |
|
915 |
static MemoryListener vfio_memory_listener = {
|
916 |
.begin = vfio_listener_dummy1, |
917 |
.commit = vfio_listener_dummy1, |
918 |
.region_add = vfio_listener_region_add, |
919 |
.region_del = vfio_listener_region_del, |
920 |
.region_nop = vfio_listener_dummy2, |
921 |
.log_start = vfio_listener_dummy2, |
922 |
.log_stop = vfio_listener_dummy2, |
923 |
.log_sync = vfio_listener_dummy2, |
924 |
.log_global_start = vfio_listener_dummy1, |
925 |
.log_global_stop = vfio_listener_dummy1, |
926 |
.eventfd_add = vfio_listener_dummy3, |
927 |
.eventfd_del = vfio_listener_dummy3, |
928 |
}; |
929 |
|
930 |
static void vfio_listener_release(VFIOContainer *container) |
931 |
{ |
932 |
memory_listener_unregister(&container->iommu_data.listener); |
933 |
} |
934 |
|
935 |
/*
|
936 |
* Interrupt setup
|
937 |
*/
|
938 |
static void vfio_disable_interrupts(VFIODevice *vdev) |
939 |
{ |
940 |
switch (vdev->interrupt) {
|
941 |
case VFIO_INT_INTx:
|
942 |
vfio_disable_intx(vdev); |
943 |
break;
|
944 |
case VFIO_INT_MSI:
|
945 |
vfio_disable_msi_x(vdev, false);
|
946 |
break;
|
947 |
case VFIO_INT_MSIX:
|
948 |
vfio_disable_msi_x(vdev, true);
|
949 |
break;
|
950 |
} |
951 |
} |
952 |
|
953 |
static int vfio_setup_msi(VFIODevice *vdev, int pos) |
954 |
{ |
955 |
uint16_t ctrl; |
956 |
bool msi_64bit, msi_maskbit;
|
957 |
int ret, entries;
|
958 |
|
959 |
/*
|
960 |
* TODO: don't peek into msi_supported, let msi_init fail and
|
961 |
* check for ENOTSUP
|
962 |
*/
|
963 |
if (!msi_supported) {
|
964 |
return 0; |
965 |
} |
966 |
|
967 |
if (pread(vdev->fd, &ctrl, sizeof(ctrl), |
968 |
vdev->config_offset + pos + PCI_CAP_FLAGS) != sizeof(ctrl)) {
|
969 |
return -errno;
|
970 |
} |
971 |
ctrl = le16_to_cpu(ctrl); |
972 |
|
973 |
msi_64bit = !!(ctrl & PCI_MSI_FLAGS_64BIT); |
974 |
msi_maskbit = !!(ctrl & PCI_MSI_FLAGS_MASKBIT); |
975 |
entries = 1 << ((ctrl & PCI_MSI_FLAGS_QMASK) >> 1); |
976 |
|
977 |
DPRINTF("%04x:%02x:%02x.%x PCI MSI CAP @0x%x\n", vdev->host.domain,
|
978 |
vdev->host.bus, vdev->host.slot, vdev->host.function, pos); |
979 |
|
980 |
ret = msi_init(&vdev->pdev, pos, entries, msi_64bit, msi_maskbit); |
981 |
if (ret < 0) { |
982 |
error_report("vfio: msi_init failed\n");
|
983 |
return ret;
|
984 |
} |
985 |
vdev->msi_cap_size = 0xa + (msi_maskbit ? 0xa : 0) + (msi_64bit ? 0x4 : 0); |
986 |
|
987 |
return 0; |
988 |
} |
989 |
|
990 |
/*
|
991 |
* We don't have any control over how pci_add_capability() inserts
|
992 |
* capabilities into the chain. In order to setup MSI-X we need a
|
993 |
* MemoryRegion for the BAR. In order to setup the BAR and not
|
994 |
* attempt to mmap the MSI-X table area, which VFIO won't allow, we
|
995 |
* need to first look for where the MSI-X table lives. So we
|
996 |
* unfortunately split MSI-X setup across two functions.
|
997 |
*/
|
998 |
static int vfio_early_setup_msix(VFIODevice *vdev) |
999 |
{ |
1000 |
uint8_t pos; |
1001 |
uint16_t ctrl; |
1002 |
uint32_t table, pba; |
1003 |
|
1004 |
pos = pci_find_capability(&vdev->pdev, PCI_CAP_ID_MSIX); |
1005 |
if (!pos) {
|
1006 |
return 0; |
1007 |
} |
1008 |
|
1009 |
if (pread(vdev->fd, &ctrl, sizeof(ctrl), |
1010 |
vdev->config_offset + pos + PCI_CAP_FLAGS) != sizeof(ctrl)) {
|
1011 |
return -errno;
|
1012 |
} |
1013 |
|
1014 |
if (pread(vdev->fd, &table, sizeof(table), |
1015 |
vdev->config_offset + pos + PCI_MSIX_TABLE) != sizeof(table)) {
|
1016 |
return -errno;
|
1017 |
} |
1018 |
|
1019 |
if (pread(vdev->fd, &pba, sizeof(pba), |
1020 |
vdev->config_offset + pos + PCI_MSIX_PBA) != sizeof(pba)) {
|
1021 |
return -errno;
|
1022 |
} |
1023 |
|
1024 |
ctrl = le16_to_cpu(ctrl); |
1025 |
table = le32_to_cpu(table); |
1026 |
pba = le32_to_cpu(pba); |
1027 |
|
1028 |
vdev->msix = g_malloc0(sizeof(*(vdev->msix)));
|
1029 |
vdev->msix->table_bar = table & PCI_MSIX_FLAGS_BIRMASK; |
1030 |
vdev->msix->table_offset = table & ~PCI_MSIX_FLAGS_BIRMASK; |
1031 |
vdev->msix->pba_bar = pba & PCI_MSIX_FLAGS_BIRMASK; |
1032 |
vdev->msix->pba_offset = pba & ~PCI_MSIX_FLAGS_BIRMASK; |
1033 |
vdev->msix->entries = (ctrl & PCI_MSIX_FLAGS_QSIZE) + 1;
|
1034 |
|
1035 |
DPRINTF("%04x:%02x:%02x.%x "
|
1036 |
"PCI MSI-X CAP @0x%x, BAR %d, offset 0x%x, entries %d\n",
|
1037 |
vdev->host.domain, vdev->host.bus, vdev->host.slot, |
1038 |
vdev->host.function, pos, vdev->msix->table_bar, |
1039 |
vdev->msix->table_offset, vdev->msix->entries); |
1040 |
|
1041 |
return 0; |
1042 |
} |
1043 |
|
1044 |
static int vfio_setup_msix(VFIODevice *vdev, int pos) |
1045 |
{ |
1046 |
int ret;
|
1047 |
|
1048 |
/*
|
1049 |
* TODO: don't peek into msi_supported, let msix_init fail and
|
1050 |
* check for ENOTSUP
|
1051 |
*/
|
1052 |
if (!msi_supported) {
|
1053 |
return 0; |
1054 |
} |
1055 |
|
1056 |
ret = msix_init(&vdev->pdev, vdev->msix->entries, |
1057 |
&vdev->bars[vdev->msix->table_bar].mem, |
1058 |
vdev->msix->table_bar, vdev->msix->table_offset, |
1059 |
&vdev->bars[vdev->msix->pba_bar].mem, |
1060 |
vdev->msix->pba_bar, vdev->msix->pba_offset, pos); |
1061 |
if (ret < 0) { |
1062 |
error_report("vfio: msix_init failed\n");
|
1063 |
return ret;
|
1064 |
} |
1065 |
|
1066 |
ret = msix_set_vector_notifiers(&vdev->pdev, vfio_msix_vector_use, |
1067 |
vfio_msix_vector_release); |
1068 |
if (ret) {
|
1069 |
error_report("vfio: msix_set_vector_notifiers failed %d\n", ret);
|
1070 |
msix_uninit(&vdev->pdev, &vdev->bars[vdev->msix->table_bar].mem, |
1071 |
&vdev->bars[vdev->msix->pba_bar].mem); |
1072 |
return ret;
|
1073 |
} |
1074 |
|
1075 |
return 0; |
1076 |
} |
1077 |
|
1078 |
static void vfio_teardown_msi(VFIODevice *vdev) |
1079 |
{ |
1080 |
msi_uninit(&vdev->pdev); |
1081 |
|
1082 |
if (vdev->msix) {
|
1083 |
/* FIXME: Why can't unset just silently do nothing?? */
|
1084 |
if (vdev->pdev.msix_vector_use_notifier &&
|
1085 |
vdev->pdev.msix_vector_release_notifier) { |
1086 |
msix_unset_vector_notifiers(&vdev->pdev); |
1087 |
} |
1088 |
|
1089 |
msix_uninit(&vdev->pdev, &vdev->bars[vdev->msix->table_bar].mem, |
1090 |
&vdev->bars[vdev->msix->pba_bar].mem); |
1091 |
} |
1092 |
} |
1093 |
|
1094 |
/*
|
1095 |
* Resource setup
|
1096 |
*/
|
1097 |
static void vfio_mmap_set_enabled(VFIODevice *vdev, bool enabled) |
1098 |
{ |
1099 |
int i;
|
1100 |
|
1101 |
for (i = 0; i < PCI_ROM_SLOT; i++) { |
1102 |
VFIOBAR *bar = &vdev->bars[i]; |
1103 |
|
1104 |
if (!bar->size) {
|
1105 |
continue;
|
1106 |
} |
1107 |
|
1108 |
memory_region_set_enabled(&bar->mmap_mem, enabled); |
1109 |
if (vdev->msix && vdev->msix->table_bar == i) {
|
1110 |
memory_region_set_enabled(&vdev->msix->mmap_mem, enabled); |
1111 |
} |
1112 |
} |
1113 |
} |
1114 |
|
1115 |
static void vfio_unmap_bar(VFIODevice *vdev, int nr) |
1116 |
{ |
1117 |
VFIOBAR *bar = &vdev->bars[nr]; |
1118 |
|
1119 |
if (!bar->size) {
|
1120 |
return;
|
1121 |
} |
1122 |
|
1123 |
memory_region_del_subregion(&bar->mem, &bar->mmap_mem); |
1124 |
munmap(bar->mmap, memory_region_size(&bar->mmap_mem)); |
1125 |
|
1126 |
if (vdev->msix && vdev->msix->table_bar == nr) {
|
1127 |
memory_region_del_subregion(&bar->mem, &vdev->msix->mmap_mem); |
1128 |
munmap(vdev->msix->mmap, memory_region_size(&vdev->msix->mmap_mem)); |
1129 |
} |
1130 |
|
1131 |
memory_region_destroy(&bar->mem); |
1132 |
} |
1133 |
|
1134 |
static int vfio_mmap_bar(VFIOBAR *bar, MemoryRegion *mem, MemoryRegion *submem, |
1135 |
void **map, size_t size, off_t offset,
|
1136 |
const char *name) |
1137 |
{ |
1138 |
int ret = 0; |
1139 |
|
1140 |
if (size && bar->flags & VFIO_REGION_INFO_FLAG_MMAP) {
|
1141 |
int prot = 0; |
1142 |
|
1143 |
if (bar->flags & VFIO_REGION_INFO_FLAG_READ) {
|
1144 |
prot |= PROT_READ; |
1145 |
} |
1146 |
|
1147 |
if (bar->flags & VFIO_REGION_INFO_FLAG_WRITE) {
|
1148 |
prot |= PROT_WRITE; |
1149 |
} |
1150 |
|
1151 |
*map = mmap(NULL, size, prot, MAP_SHARED,
|
1152 |
bar->fd, bar->fd_offset + offset); |
1153 |
if (*map == MAP_FAILED) {
|
1154 |
*map = NULL;
|
1155 |
ret = -errno; |
1156 |
goto empty_region;
|
1157 |
} |
1158 |
|
1159 |
memory_region_init_ram_ptr(submem, name, size, *map); |
1160 |
} else {
|
1161 |
empty_region:
|
1162 |
/* Create a zero sized sub-region to make cleanup easy. */
|
1163 |
memory_region_init(submem, name, 0);
|
1164 |
} |
1165 |
|
1166 |
memory_region_add_subregion(mem, offset, submem); |
1167 |
|
1168 |
return ret;
|
1169 |
} |
1170 |
|
1171 |
static void vfio_map_bar(VFIODevice *vdev, int nr) |
1172 |
{ |
1173 |
VFIOBAR *bar = &vdev->bars[nr]; |
1174 |
unsigned size = bar->size;
|
1175 |
char name[64]; |
1176 |
uint32_t pci_bar; |
1177 |
uint8_t type; |
1178 |
int ret;
|
1179 |
|
1180 |
/* Skip both unimplemented BARs and the upper half of 64bit BARS. */
|
1181 |
if (!size) {
|
1182 |
return;
|
1183 |
} |
1184 |
|
1185 |
snprintf(name, sizeof(name), "VFIO %04x:%02x:%02x.%x BAR %d", |
1186 |
vdev->host.domain, vdev->host.bus, vdev->host.slot, |
1187 |
vdev->host.function, nr); |
1188 |
|
1189 |
/* Determine what type of BAR this is for registration */
|
1190 |
ret = pread(vdev->fd, &pci_bar, sizeof(pci_bar),
|
1191 |
vdev->config_offset + PCI_BASE_ADDRESS_0 + (4 * nr));
|
1192 |
if (ret != sizeof(pci_bar)) { |
1193 |
error_report("vfio: Failed to read BAR %d (%m)\n", nr);
|
1194 |
return;
|
1195 |
} |
1196 |
|
1197 |
pci_bar = le32_to_cpu(pci_bar); |
1198 |
type = pci_bar & (pci_bar & PCI_BASE_ADDRESS_SPACE_IO ? |
1199 |
~PCI_BASE_ADDRESS_IO_MASK : ~PCI_BASE_ADDRESS_MEM_MASK); |
1200 |
|
1201 |
/* A "slow" read/write mapping underlies all BARs */
|
1202 |
memory_region_init_io(&bar->mem, &vfio_bar_ops, bar, name, size); |
1203 |
pci_register_bar(&vdev->pdev, nr, type, &bar->mem); |
1204 |
|
1205 |
/*
|
1206 |
* We can't mmap areas overlapping the MSIX vector table, so we
|
1207 |
* potentially insert a direct-mapped subregion before and after it.
|
1208 |
*/
|
1209 |
if (vdev->msix && vdev->msix->table_bar == nr) {
|
1210 |
size = vdev->msix->table_offset & TARGET_PAGE_MASK; |
1211 |
} |
1212 |
|
1213 |
strncat(name, " mmap", sizeof(name) - strlen(name) - 1); |
1214 |
if (vfio_mmap_bar(bar, &bar->mem,
|
1215 |
&bar->mmap_mem, &bar->mmap, size, 0, name)) {
|
1216 |
error_report("%s unsupported. Performance may be slow\n", name);
|
1217 |
} |
1218 |
|
1219 |
if (vdev->msix && vdev->msix->table_bar == nr) {
|
1220 |
unsigned start;
|
1221 |
|
1222 |
start = TARGET_PAGE_ALIGN(vdev->msix->table_offset + |
1223 |
(vdev->msix->entries * PCI_MSIX_ENTRY_SIZE)); |
1224 |
|
1225 |
size = start < bar->size ? bar->size - start : 0;
|
1226 |
strncat(name, " msix-hi", sizeof(name) - strlen(name) - 1); |
1227 |
/* VFIOMSIXInfo contains another MemoryRegion for this mapping */
|
1228 |
if (vfio_mmap_bar(bar, &bar->mem, &vdev->msix->mmap_mem,
|
1229 |
&vdev->msix->mmap, size, start, name)) { |
1230 |
error_report("%s unsupported. Performance may be slow\n", name);
|
1231 |
} |
1232 |
} |
1233 |
} |
1234 |
|
1235 |
static void vfio_map_bars(VFIODevice *vdev) |
1236 |
{ |
1237 |
int i;
|
1238 |
|
1239 |
for (i = 0; i < PCI_ROM_SLOT; i++) { |
1240 |
vfio_map_bar(vdev, i); |
1241 |
} |
1242 |
} |
1243 |
|
1244 |
static void vfio_unmap_bars(VFIODevice *vdev) |
1245 |
{ |
1246 |
int i;
|
1247 |
|
1248 |
for (i = 0; i < PCI_ROM_SLOT; i++) { |
1249 |
vfio_unmap_bar(vdev, i); |
1250 |
} |
1251 |
} |
1252 |
|
1253 |
/*
|
1254 |
* General setup
|
1255 |
*/
|
1256 |
static uint8_t vfio_std_cap_max_size(PCIDevice *pdev, uint8_t pos)
|
1257 |
{ |
1258 |
uint8_t tmp, next = 0xff;
|
1259 |
|
1260 |
for (tmp = pdev->config[PCI_CAPABILITY_LIST]; tmp;
|
1261 |
tmp = pdev->config[tmp + 1]) {
|
1262 |
if (tmp > pos && tmp < next) {
|
1263 |
next = tmp; |
1264 |
} |
1265 |
} |
1266 |
|
1267 |
return next - pos;
|
1268 |
} |
1269 |
|
1270 |
static int vfio_add_std_cap(VFIODevice *vdev, uint8_t pos) |
1271 |
{ |
1272 |
PCIDevice *pdev = &vdev->pdev; |
1273 |
uint8_t cap_id, next, size; |
1274 |
int ret;
|
1275 |
|
1276 |
cap_id = pdev->config[pos]; |
1277 |
next = pdev->config[pos + 1];
|
1278 |
|
1279 |
/*
|
1280 |
* If it becomes important to configure capabilities to their actual
|
1281 |
* size, use this as the default when it's something we don't recognize.
|
1282 |
* Since QEMU doesn't actually handle many of the config accesses,
|
1283 |
* exact size doesn't seem worthwhile.
|
1284 |
*/
|
1285 |
size = vfio_std_cap_max_size(pdev, pos); |
1286 |
|
1287 |
/*
|
1288 |
* pci_add_capability always inserts the new capability at the head
|
1289 |
* of the chain. Therefore to end up with a chain that matches the
|
1290 |
* physical device, we insert from the end by making this recursive.
|
1291 |
* This is also why we pre-caclulate size above as cached config space
|
1292 |
* will be changed as we unwind the stack.
|
1293 |
*/
|
1294 |
if (next) {
|
1295 |
ret = vfio_add_std_cap(vdev, next); |
1296 |
if (ret) {
|
1297 |
return ret;
|
1298 |
} |
1299 |
} else {
|
1300 |
pdev->config[PCI_CAPABILITY_LIST] = 0; /* Begin the rebuild */ |
1301 |
} |
1302 |
|
1303 |
switch (cap_id) {
|
1304 |
case PCI_CAP_ID_MSI:
|
1305 |
ret = vfio_setup_msi(vdev, pos); |
1306 |
break;
|
1307 |
case PCI_CAP_ID_MSIX:
|
1308 |
ret = vfio_setup_msix(vdev, pos); |
1309 |
break;
|
1310 |
default:
|
1311 |
ret = pci_add_capability(pdev, cap_id, pos, size); |
1312 |
break;
|
1313 |
} |
1314 |
|
1315 |
if (ret < 0) { |
1316 |
error_report("vfio: %04x:%02x:%02x.%x Error adding PCI capability "
|
1317 |
"0x%x[0x%x]@0x%x: %d\n", vdev->host.domain,
|
1318 |
vdev->host.bus, vdev->host.slot, vdev->host.function, |
1319 |
cap_id, size, pos, ret); |
1320 |
return ret;
|
1321 |
} |
1322 |
|
1323 |
return 0; |
1324 |
} |
1325 |
|
1326 |
static int vfio_add_capabilities(VFIODevice *vdev) |
1327 |
{ |
1328 |
PCIDevice *pdev = &vdev->pdev; |
1329 |
|
1330 |
if (!(pdev->config[PCI_STATUS] & PCI_STATUS_CAP_LIST) ||
|
1331 |
!pdev->config[PCI_CAPABILITY_LIST]) { |
1332 |
return 0; /* Nothing to add */ |
1333 |
} |
1334 |
|
1335 |
return vfio_add_std_cap(vdev, pdev->config[PCI_CAPABILITY_LIST]);
|
1336 |
} |
1337 |
|
1338 |
static int vfio_load_rom(VFIODevice *vdev) |
1339 |
{ |
1340 |
uint64_t size = vdev->rom_size; |
1341 |
char name[32]; |
1342 |
off_t off = 0, voff = vdev->rom_offset;
|
1343 |
ssize_t bytes; |
1344 |
void *ptr;
|
1345 |
|
1346 |
/* If loading ROM from file, pci handles it */
|
1347 |
if (vdev->pdev.romfile || !vdev->pdev.rom_bar || !size) {
|
1348 |
return 0; |
1349 |
} |
1350 |
|
1351 |
DPRINTF("%s(%04x:%02x:%02x.%x)\n", __func__, vdev->host.domain,
|
1352 |
vdev->host.bus, vdev->host.slot, vdev->host.function); |
1353 |
|
1354 |
snprintf(name, sizeof(name), "vfio[%04x:%02x:%02x.%x].rom", |
1355 |
vdev->host.domain, vdev->host.bus, vdev->host.slot, |
1356 |
vdev->host.function); |
1357 |
memory_region_init_ram(&vdev->pdev.rom, name, size); |
1358 |
ptr = memory_region_get_ram_ptr(&vdev->pdev.rom); |
1359 |
memset(ptr, 0xff, size);
|
1360 |
|
1361 |
while (size) {
|
1362 |
bytes = pread(vdev->fd, ptr + off, size, voff + off); |
1363 |
if (bytes == 0) { |
1364 |
break; /* expect that we could get back less than the ROM BAR */ |
1365 |
} else if (bytes > 0) { |
1366 |
off += bytes; |
1367 |
size -= bytes; |
1368 |
} else {
|
1369 |
if (errno == EINTR || errno == EAGAIN) {
|
1370 |
continue;
|
1371 |
} |
1372 |
error_report("vfio: Error reading device ROM: %m\n");
|
1373 |
memory_region_destroy(&vdev->pdev.rom); |
1374 |
return -errno;
|
1375 |
} |
1376 |
} |
1377 |
|
1378 |
pci_register_bar(&vdev->pdev, PCI_ROM_SLOT, 0, &vdev->pdev.rom);
|
1379 |
vdev->pdev.has_rom = true;
|
1380 |
return 0; |
1381 |
} |
1382 |
|
1383 |
static int vfio_connect_container(VFIOGroup *group) |
1384 |
{ |
1385 |
VFIOContainer *container; |
1386 |
int ret, fd;
|
1387 |
|
1388 |
if (group->container) {
|
1389 |
return 0; |
1390 |
} |
1391 |
|
1392 |
QLIST_FOREACH(container, &container_list, next) { |
1393 |
if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) {
|
1394 |
group->container = container; |
1395 |
QLIST_INSERT_HEAD(&container->group_list, group, container_next); |
1396 |
return 0; |
1397 |
} |
1398 |
} |
1399 |
|
1400 |
fd = qemu_open("/dev/vfio/vfio", O_RDWR);
|
1401 |
if (fd < 0) { |
1402 |
error_report("vfio: failed to open /dev/vfio/vfio: %m\n");
|
1403 |
return -errno;
|
1404 |
} |
1405 |
|
1406 |
ret = ioctl(fd, VFIO_GET_API_VERSION); |
1407 |
if (ret != VFIO_API_VERSION) {
|
1408 |
error_report("vfio: supported vfio version: %d, "
|
1409 |
"reported version: %d\n", VFIO_API_VERSION, ret);
|
1410 |
close(fd); |
1411 |
return -EINVAL;
|
1412 |
} |
1413 |
|
1414 |
container = g_malloc0(sizeof(*container));
|
1415 |
container->fd = fd; |
1416 |
|
1417 |
if (ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1_IOMMU)) {
|
1418 |
ret = ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &fd); |
1419 |
if (ret) {
|
1420 |
error_report("vfio: failed to set group container: %m\n");
|
1421 |
g_free(container); |
1422 |
close(fd); |
1423 |
return -errno;
|
1424 |
} |
1425 |
|
1426 |
ret = ioctl(fd, VFIO_SET_IOMMU, VFIO_TYPE1_IOMMU); |
1427 |
if (ret) {
|
1428 |
error_report("vfio: failed to set iommu for container: %m\n");
|
1429 |
g_free(container); |
1430 |
close(fd); |
1431 |
return -errno;
|
1432 |
} |
1433 |
|
1434 |
container->iommu_data.listener = vfio_memory_listener; |
1435 |
container->iommu_data.release = vfio_listener_release; |
1436 |
|
1437 |
memory_listener_register(&container->iommu_data.listener, |
1438 |
get_system_memory()); |
1439 |
} else {
|
1440 |
error_report("vfio: No available IOMMU models\n");
|
1441 |
g_free(container); |
1442 |
close(fd); |
1443 |
return -EINVAL;
|
1444 |
} |
1445 |
|
1446 |
QLIST_INIT(&container->group_list); |
1447 |
QLIST_INSERT_HEAD(&container_list, container, next); |
1448 |
|
1449 |
group->container = container; |
1450 |
QLIST_INSERT_HEAD(&container->group_list, group, container_next); |
1451 |
|
1452 |
return 0; |
1453 |
} |
1454 |
|
1455 |
static void vfio_disconnect_container(VFIOGroup *group) |
1456 |
{ |
1457 |
VFIOContainer *container = group->container; |
1458 |
|
1459 |
if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) {
|
1460 |
error_report("vfio: error disconnecting group %d from container\n",
|
1461 |
group->groupid); |
1462 |
} |
1463 |
|
1464 |
QLIST_REMOVE(group, container_next); |
1465 |
group->container = NULL;
|
1466 |
|
1467 |
if (QLIST_EMPTY(&container->group_list)) {
|
1468 |
if (container->iommu_data.release) {
|
1469 |
container->iommu_data.release(container); |
1470 |
} |
1471 |
QLIST_REMOVE(container, next); |
1472 |
DPRINTF("vfio_disconnect_container: close container->fd\n");
|
1473 |
close(container->fd); |
1474 |
g_free(container); |
1475 |
} |
1476 |
} |
1477 |
|
1478 |
static VFIOGroup *vfio_get_group(int groupid) |
1479 |
{ |
1480 |
VFIOGroup *group; |
1481 |
char path[32]; |
1482 |
struct vfio_group_status status = { .argsz = sizeof(status) }; |
1483 |
|
1484 |
QLIST_FOREACH(group, &group_list, next) { |
1485 |
if (group->groupid == groupid) {
|
1486 |
return group;
|
1487 |
} |
1488 |
} |
1489 |
|
1490 |
group = g_malloc0(sizeof(*group));
|
1491 |
|
1492 |
snprintf(path, sizeof(path), "/dev/vfio/%d", groupid); |
1493 |
group->fd = qemu_open(path, O_RDWR); |
1494 |
if (group->fd < 0) { |
1495 |
error_report("vfio: error opening %s: %m\n", path);
|
1496 |
g_free(group); |
1497 |
return NULL; |
1498 |
} |
1499 |
|
1500 |
if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) {
|
1501 |
error_report("vfio: error getting group status: %m\n");
|
1502 |
close(group->fd); |
1503 |
g_free(group); |
1504 |
return NULL; |
1505 |
} |
1506 |
|
1507 |
if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) {
|
1508 |
error_report("vfio: error, group %d is not viable, please ensure "
|
1509 |
"all devices within the iommu_group are bound to their "
|
1510 |
"vfio bus driver.\n", groupid);
|
1511 |
close(group->fd); |
1512 |
g_free(group); |
1513 |
return NULL; |
1514 |
} |
1515 |
|
1516 |
group->groupid = groupid; |
1517 |
QLIST_INIT(&group->device_list); |
1518 |
|
1519 |
if (vfio_connect_container(group)) {
|
1520 |
error_report("vfio: failed to setup container for group %d\n", groupid);
|
1521 |
close(group->fd); |
1522 |
g_free(group); |
1523 |
return NULL; |
1524 |
} |
1525 |
|
1526 |
QLIST_INSERT_HEAD(&group_list, group, next); |
1527 |
|
1528 |
return group;
|
1529 |
} |
1530 |
|
1531 |
static void vfio_put_group(VFIOGroup *group) |
1532 |
{ |
1533 |
if (!QLIST_EMPTY(&group->device_list)) {
|
1534 |
return;
|
1535 |
} |
1536 |
|
1537 |
vfio_disconnect_container(group); |
1538 |
QLIST_REMOVE(group, next); |
1539 |
DPRINTF("vfio_put_group: close group->fd\n");
|
1540 |
close(group->fd); |
1541 |
g_free(group); |
1542 |
} |
1543 |
|
1544 |
static int vfio_get_device(VFIOGroup *group, const char *name, VFIODevice *vdev) |
1545 |
{ |
1546 |
struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) }; |
1547 |
struct vfio_region_info reg_info = { .argsz = sizeof(reg_info) }; |
1548 |
int ret, i;
|
1549 |
|
1550 |
ret = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name); |
1551 |
if (ret < 0) { |
1552 |
error_report("vfio: error getting device %s from group %d: %m\n",
|
1553 |
name, group->groupid); |
1554 |
error_report("Verify all devices in group %d are bound to vfio-pci "
|
1555 |
"or pci-stub and not already in use\n", group->groupid);
|
1556 |
return ret;
|
1557 |
} |
1558 |
|
1559 |
vdev->fd = ret; |
1560 |
vdev->group = group; |
1561 |
QLIST_INSERT_HEAD(&group->device_list, vdev, next); |
1562 |
|
1563 |
/* Sanity check device */
|
1564 |
ret = ioctl(vdev->fd, VFIO_DEVICE_GET_INFO, &dev_info); |
1565 |
if (ret) {
|
1566 |
error_report("vfio: error getting device info: %m\n");
|
1567 |
goto error;
|
1568 |
} |
1569 |
|
1570 |
DPRINTF("Device %s flags: %u, regions: %u, irgs: %u\n", name,
|
1571 |
dev_info.flags, dev_info.num_regions, dev_info.num_irqs); |
1572 |
|
1573 |
if (!(dev_info.flags & VFIO_DEVICE_FLAGS_PCI)) {
|
1574 |
error_report("vfio: Um, this isn't a PCI device\n");
|
1575 |
goto error;
|
1576 |
} |
1577 |
|
1578 |
vdev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET); |
1579 |
if (!vdev->reset_works) {
|
1580 |
error_report("Warning, device %s does not support reset\n", name);
|
1581 |
} |
1582 |
|
1583 |
if (dev_info.num_regions != VFIO_PCI_NUM_REGIONS) {
|
1584 |
error_report("vfio: unexpected number of io regions %u\n",
|
1585 |
dev_info.num_regions); |
1586 |
goto error;
|
1587 |
} |
1588 |
|
1589 |
if (dev_info.num_irqs != VFIO_PCI_NUM_IRQS) {
|
1590 |
error_report("vfio: unexpected number of irqs %u\n", dev_info.num_irqs);
|
1591 |
goto error;
|
1592 |
} |
1593 |
|
1594 |
for (i = VFIO_PCI_BAR0_REGION_INDEX; i < VFIO_PCI_ROM_REGION_INDEX; i++) {
|
1595 |
reg_info.index = i; |
1596 |
|
1597 |
ret = ioctl(vdev->fd, VFIO_DEVICE_GET_REGION_INFO, ®_info); |
1598 |
if (ret) {
|
1599 |
error_report("vfio: Error getting region %d info: %m\n", i);
|
1600 |
goto error;
|
1601 |
} |
1602 |
|
1603 |
DPRINTF("Device %s region %d:\n", name, i);
|
1604 |
DPRINTF(" size: 0x%lx, offset: 0x%lx, flags: 0x%lx\n",
|
1605 |
(unsigned long)reg_info.size, (unsigned long)reg_info.offset, |
1606 |
(unsigned long)reg_info.flags); |
1607 |
|
1608 |
vdev->bars[i].flags = reg_info.flags; |
1609 |
vdev->bars[i].size = reg_info.size; |
1610 |
vdev->bars[i].fd_offset = reg_info.offset; |
1611 |
vdev->bars[i].fd = vdev->fd; |
1612 |
vdev->bars[i].nr = i; |
1613 |
} |
1614 |
|
1615 |
reg_info.index = VFIO_PCI_ROM_REGION_INDEX; |
1616 |
|
1617 |
ret = ioctl(vdev->fd, VFIO_DEVICE_GET_REGION_INFO, ®_info); |
1618 |
if (ret) {
|
1619 |
error_report("vfio: Error getting ROM info: %m\n");
|
1620 |
goto error;
|
1621 |
} |
1622 |
|
1623 |
DPRINTF("Device %s ROM:\n", name);
|
1624 |
DPRINTF(" size: 0x%lx, offset: 0x%lx, flags: 0x%lx\n",
|
1625 |
(unsigned long)reg_info.size, (unsigned long)reg_info.offset, |
1626 |
(unsigned long)reg_info.flags); |
1627 |
|
1628 |
vdev->rom_size = reg_info.size; |
1629 |
vdev->rom_offset = reg_info.offset; |
1630 |
|
1631 |
reg_info.index = VFIO_PCI_CONFIG_REGION_INDEX; |
1632 |
|
1633 |
ret = ioctl(vdev->fd, VFIO_DEVICE_GET_REGION_INFO, ®_info); |
1634 |
if (ret) {
|
1635 |
error_report("vfio: Error getting config info: %m\n");
|
1636 |
goto error;
|
1637 |
} |
1638 |
|
1639 |
DPRINTF("Device %s config:\n", name);
|
1640 |
DPRINTF(" size: 0x%lx, offset: 0x%lx, flags: 0x%lx\n",
|
1641 |
(unsigned long)reg_info.size, (unsigned long)reg_info.offset, |
1642 |
(unsigned long)reg_info.flags); |
1643 |
|
1644 |
vdev->config_size = reg_info.size; |
1645 |
vdev->config_offset = reg_info.offset; |
1646 |
|
1647 |
error:
|
1648 |
if (ret) {
|
1649 |
QLIST_REMOVE(vdev, next); |
1650 |
vdev->group = NULL;
|
1651 |
close(vdev->fd); |
1652 |
} |
1653 |
return ret;
|
1654 |
} |
1655 |
|
1656 |
static void vfio_put_device(VFIODevice *vdev) |
1657 |
{ |
1658 |
QLIST_REMOVE(vdev, next); |
1659 |
vdev->group = NULL;
|
1660 |
DPRINTF("vfio_put_device: close vdev->fd\n");
|
1661 |
close(vdev->fd); |
1662 |
if (vdev->msix) {
|
1663 |
g_free(vdev->msix); |
1664 |
vdev->msix = NULL;
|
1665 |
} |
1666 |
} |
1667 |
|
1668 |
static int vfio_initfn(PCIDevice *pdev) |
1669 |
{ |
1670 |
VFIODevice *pvdev, *vdev = DO_UPCAST(VFIODevice, pdev, pdev); |
1671 |
VFIOGroup *group; |
1672 |
char path[PATH_MAX], iommu_group_path[PATH_MAX], *group_name;
|
1673 |
ssize_t len; |
1674 |
struct stat st;
|
1675 |
int groupid;
|
1676 |
int ret;
|
1677 |
|
1678 |
/* Check that the host device exists */
|
1679 |
snprintf(path, sizeof(path),
|
1680 |
"/sys/bus/pci/devices/%04x:%02x:%02x.%01x/",
|
1681 |
vdev->host.domain, vdev->host.bus, vdev->host.slot, |
1682 |
vdev->host.function); |
1683 |
if (stat(path, &st) < 0) { |
1684 |
error_report("vfio: error: no such host device: %s\n", path);
|
1685 |
return -errno;
|
1686 |
} |
1687 |
|
1688 |
strncat(path, "iommu_group", sizeof(path) - strlen(path) - 1); |
1689 |
|
1690 |
len = readlink(path, iommu_group_path, PATH_MAX); |
1691 |
if (len <= 0) { |
1692 |
error_report("vfio: error no iommu_group for device\n");
|
1693 |
return -errno;
|
1694 |
} |
1695 |
|
1696 |
iommu_group_path[len] = 0;
|
1697 |
group_name = basename(iommu_group_path); |
1698 |
|
1699 |
if (sscanf(group_name, "%d", &groupid) != 1) { |
1700 |
error_report("vfio: error reading %s: %m\n", path);
|
1701 |
return -errno;
|
1702 |
} |
1703 |
|
1704 |
DPRINTF("%s(%04x:%02x:%02x.%x) group %d\n", __func__, vdev->host.domain,
|
1705 |
vdev->host.bus, vdev->host.slot, vdev->host.function, groupid); |
1706 |
|
1707 |
group = vfio_get_group(groupid); |
1708 |
if (!group) {
|
1709 |
error_report("vfio: failed to get group %d\n", groupid);
|
1710 |
return -ENOENT;
|
1711 |
} |
1712 |
|
1713 |
snprintf(path, sizeof(path), "%04x:%02x:%02x.%01x", |
1714 |
vdev->host.domain, vdev->host.bus, vdev->host.slot, |
1715 |
vdev->host.function); |
1716 |
|
1717 |
QLIST_FOREACH(pvdev, &group->device_list, next) { |
1718 |
if (pvdev->host.domain == vdev->host.domain &&
|
1719 |
pvdev->host.bus == vdev->host.bus && |
1720 |
pvdev->host.slot == vdev->host.slot && |
1721 |
pvdev->host.function == vdev->host.function) { |
1722 |
|
1723 |
error_report("vfio: error: device %s is already attached\n", path);
|
1724 |
vfio_put_group(group); |
1725 |
return -EBUSY;
|
1726 |
} |
1727 |
} |
1728 |
|
1729 |
ret = vfio_get_device(group, path, vdev); |
1730 |
if (ret) {
|
1731 |
error_report("vfio: failed to get device %s\n", path);
|
1732 |
vfio_put_group(group); |
1733 |
return ret;
|
1734 |
} |
1735 |
|
1736 |
/* Get a copy of config space */
|
1737 |
ret = pread(vdev->fd, vdev->pdev.config, |
1738 |
MIN(pci_config_size(&vdev->pdev), vdev->config_size), |
1739 |
vdev->config_offset); |
1740 |
if (ret < (int)MIN(pci_config_size(&vdev->pdev), vdev->config_size)) { |
1741 |
ret = ret < 0 ? -errno : -EFAULT;
|
1742 |
error_report("vfio: Failed to read device config space\n");
|
1743 |
goto out_put;
|
1744 |
} |
1745 |
|
1746 |
/*
|
1747 |
* Clear host resource mapping info. If we choose not to register a
|
1748 |
* BAR, such as might be the case with the option ROM, we can get
|
1749 |
* confusing, unwritable, residual addresses from the host here.
|
1750 |
*/
|
1751 |
memset(&vdev->pdev.config[PCI_BASE_ADDRESS_0], 0, 24); |
1752 |
memset(&vdev->pdev.config[PCI_ROM_ADDRESS], 0, 4); |
1753 |
|
1754 |
vfio_load_rom(vdev); |
1755 |
|
1756 |
ret = vfio_early_setup_msix(vdev); |
1757 |
if (ret) {
|
1758 |
goto out_put;
|
1759 |
} |
1760 |
|
1761 |
vfio_map_bars(vdev); |
1762 |
|
1763 |
ret = vfio_add_capabilities(vdev); |
1764 |
if (ret) {
|
1765 |
goto out_teardown;
|
1766 |
} |
1767 |
|
1768 |
if (vfio_pci_read_config(&vdev->pdev, PCI_INTERRUPT_PIN, 1)) { |
1769 |
if (vdev->intx.intx && strcmp(vdev->intx.intx, "off")) { |
1770 |
error_report("vfio: Unknown option x-intx=%s, "
|
1771 |
"valid options: \"off\".\n", vdev->intx.intx);
|
1772 |
ret = -EINVAL; |
1773 |
goto out_teardown;
|
1774 |
} |
1775 |
|
1776 |
if (vdev->intx.intx && !strcmp(vdev->intx.intx, "off")) { |
1777 |
vdev->intx.disabled = true;
|
1778 |
} |
1779 |
|
1780 |
ret = vfio_enable_intx(vdev); |
1781 |
if (ret) {
|
1782 |
goto out_teardown;
|
1783 |
} |
1784 |
} |
1785 |
|
1786 |
return 0; |
1787 |
|
1788 |
out_teardown:
|
1789 |
pci_device_set_intx_routing_notifier(&vdev->pdev, NULL);
|
1790 |
vfio_teardown_msi(vdev); |
1791 |
vfio_unmap_bars(vdev); |
1792 |
out_put:
|
1793 |
vfio_put_device(vdev); |
1794 |
vfio_put_group(group); |
1795 |
return ret;
|
1796 |
} |
1797 |
|
1798 |
static void vfio_exitfn(PCIDevice *pdev) |
1799 |
{ |
1800 |
VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev); |
1801 |
VFIOGroup *group = vdev->group; |
1802 |
|
1803 |
pci_device_set_intx_routing_notifier(&vdev->pdev, NULL);
|
1804 |
vfio_disable_interrupts(vdev); |
1805 |
vfio_teardown_msi(vdev); |
1806 |
vfio_unmap_bars(vdev); |
1807 |
vfio_put_device(vdev); |
1808 |
vfio_put_group(group); |
1809 |
} |
1810 |
|
1811 |
static void vfio_pci_reset(DeviceState *dev) |
1812 |
{ |
1813 |
PCIDevice *pdev = DO_UPCAST(PCIDevice, qdev, dev); |
1814 |
VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev); |
1815 |
|
1816 |
if (!vdev->reset_works) {
|
1817 |
return;
|
1818 |
} |
1819 |
|
1820 |
if (ioctl(vdev->fd, VFIO_DEVICE_RESET)) {
|
1821 |
error_report("vfio: Error unable to reset physical device "
|
1822 |
"(%04x:%02x:%02x.%x): %m\n", vdev->host.domain,
|
1823 |
vdev->host.bus, vdev->host.slot, vdev->host.function); |
1824 |
} |
1825 |
} |
1826 |
|
1827 |
static Property vfio_pci_dev_properties[] = {
|
1828 |
DEFINE_PROP_PCI_HOST_DEVADDR("host", VFIODevice, host),
|
1829 |
DEFINE_PROP_STRING("x-intx", VFIODevice, intx.intx),
|
1830 |
/*
|
1831 |
* TODO - support passed fds... is this necessary?
|
1832 |
* DEFINE_PROP_STRING("vfiofd", VFIODevice, vfiofd_name),
|
1833 |
* DEFINE_PROP_STRING("vfiogroupfd, VFIODevice, vfiogroupfd_name),
|
1834 |
*/
|
1835 |
DEFINE_PROP_END_OF_LIST(), |
1836 |
}; |
1837 |
|
1838 |
|
1839 |
static void vfio_pci_dev_class_init(ObjectClass *klass, void *data) |
1840 |
{ |
1841 |
DeviceClass *dc = DEVICE_CLASS(klass); |
1842 |
PCIDeviceClass *pdc = PCI_DEVICE_CLASS(klass); |
1843 |
|
1844 |
dc->reset = vfio_pci_reset; |
1845 |
dc->props = vfio_pci_dev_properties; |
1846 |
pdc->init = vfio_initfn; |
1847 |
pdc->exit = vfio_exitfn; |
1848 |
pdc->config_read = vfio_pci_read_config; |
1849 |
pdc->config_write = vfio_pci_write_config; |
1850 |
} |
1851 |
|
1852 |
static const TypeInfo vfio_pci_dev_info = { |
1853 |
.name = "vfio-pci",
|
1854 |
.parent = TYPE_PCI_DEVICE, |
1855 |
.instance_size = sizeof(VFIODevice),
|
1856 |
.class_init = vfio_pci_dev_class_init, |
1857 |
}; |
1858 |
|
1859 |
static void register_vfio_pci_dev_type(void) |
1860 |
{ |
1861 |
type_register_static(&vfio_pci_dev_info); |
1862 |
} |
1863 |
|
1864 |
type_init(register_vfio_pci_dev_type) |