root / hw / virtio-pci.c @ 7063f49f
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/*
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* Virtio PCI Bindings
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*
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* Copyright IBM, Corp. 2007
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* Copyright (c) 2009 CodeSourcery
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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* Paul Brook <paul@codesourcery.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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*/
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#include <inttypes.h> |
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#include "virtio.h" |
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#include "virtio-blk.h" |
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#include "virtio-net.h" |
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#include "pci.h" |
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#include "qemu-error.h" |
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#include "msix.h" |
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#include "net.h" |
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#include "loader.h" |
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#include "kvm.h" |
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#include "blockdev.h" |
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/* from Linux's linux/virtio_pci.h */
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/* A 32-bit r/o bitmask of the features supported by the host */
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#define VIRTIO_PCI_HOST_FEATURES 0 |
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/* A 32-bit r/w bitmask of features activated by the guest */
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#define VIRTIO_PCI_GUEST_FEATURES 4 |
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/* A 32-bit r/w PFN for the currently selected queue */
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#define VIRTIO_PCI_QUEUE_PFN 8 |
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/* A 16-bit r/o queue size for the currently selected queue */
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#define VIRTIO_PCI_QUEUE_NUM 12 |
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/* A 16-bit r/w queue selector */
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#define VIRTIO_PCI_QUEUE_SEL 14 |
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/* A 16-bit r/w queue notifier */
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#define VIRTIO_PCI_QUEUE_NOTIFY 16 |
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/* An 8-bit device status register. */
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#define VIRTIO_PCI_STATUS 18 |
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/* An 8-bit r/o interrupt status register. Reading the value will return the
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* current contents of the ISR and will also clear it. This is effectively
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* a read-and-acknowledge. */
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#define VIRTIO_PCI_ISR 19 |
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/* MSI-X registers: only enabled if MSI-X is enabled. */
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/* A 16-bit vector for configuration changes. */
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#define VIRTIO_MSI_CONFIG_VECTOR 20 |
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/* A 16-bit vector for selected queue notifications. */
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#define VIRTIO_MSI_QUEUE_VECTOR 22 |
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/* Config space size */
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#define VIRTIO_PCI_CONFIG_NOMSI 20 |
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#define VIRTIO_PCI_CONFIG_MSI 24 |
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#define VIRTIO_PCI_REGION_SIZE(dev) (msix_present(dev) ? \
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VIRTIO_PCI_CONFIG_MSI : \ |
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VIRTIO_PCI_CONFIG_NOMSI) |
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/* The remaining space is defined by each driver as the per-driver
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* configuration space */
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#define VIRTIO_PCI_CONFIG(dev) (msix_enabled(dev) ? \
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VIRTIO_PCI_CONFIG_MSI : \ |
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VIRTIO_PCI_CONFIG_NOMSI) |
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/* Virtio ABI version, if we increment this, we break the guest driver. */
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#define VIRTIO_PCI_ABI_VERSION 0 |
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/* How many bits to shift physical queue address written to QUEUE_PFN.
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* 12 is historical, and due to x86 page size. */
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#define VIRTIO_PCI_QUEUE_ADDR_SHIFT 12 |
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/* Flags track per-device state like workarounds for quirks in older guests. */
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#define VIRTIO_PCI_FLAG_BUS_MASTER_BUG (1 << 0) |
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/* Performance improves when virtqueue kick processing is decoupled from the
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* vcpu thread using ioeventfd for some devices. */
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#define VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT 1 |
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#define VIRTIO_PCI_FLAG_USE_IOEVENTFD (1 << VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT) |
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/* QEMU doesn't strictly need write barriers since everything runs in
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* lock-step. We'll leave the calls to wmb() in though to make it obvious for
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* KVM or if kqemu gets SMP support.
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*/
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#define wmb() do { } while (0) |
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/* PCI bindings. */
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typedef struct { |
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PCIDevice pci_dev; |
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VirtIODevice *vdev; |
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uint32_t flags; |
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uint32_t addr; |
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uint32_t class_code; |
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uint32_t nvectors; |
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BlockConf block; |
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NICConf nic; |
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uint32_t host_features; |
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#ifdef CONFIG_LINUX
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V9fsConf fsconf; |
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#endif
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/* Max. number of ports we can have for a the virtio-serial device */
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uint32_t max_virtserial_ports; |
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virtio_net_conf net; |
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bool ioeventfd_disabled;
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bool ioeventfd_started;
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} VirtIOPCIProxy; |
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/* virtio device */
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static void virtio_pci_notify(void *opaque, uint16_t vector) |
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{ |
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VirtIOPCIProxy *proxy = opaque; |
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if (msix_enabled(&proxy->pci_dev))
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msix_notify(&proxy->pci_dev, vector); |
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else
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qemu_set_irq(proxy->pci_dev.irq[0], proxy->vdev->isr & 1); |
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} |
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static void virtio_pci_save_config(void * opaque, QEMUFile *f) |
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{ |
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VirtIOPCIProxy *proxy = opaque; |
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pci_device_save(&proxy->pci_dev, f); |
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msix_save(&proxy->pci_dev, f); |
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if (msix_present(&proxy->pci_dev))
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qemu_put_be16(f, proxy->vdev->config_vector); |
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} |
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static void virtio_pci_save_queue(void * opaque, int n, QEMUFile *f) |
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{ |
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VirtIOPCIProxy *proxy = opaque; |
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if (msix_present(&proxy->pci_dev))
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qemu_put_be16(f, virtio_queue_vector(proxy->vdev, n)); |
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} |
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static int virtio_pci_load_config(void * opaque, QEMUFile *f) |
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{ |
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VirtIOPCIProxy *proxy = opaque; |
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int ret;
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ret = pci_device_load(&proxy->pci_dev, f); |
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if (ret) {
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return ret;
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} |
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msix_load(&proxy->pci_dev, f); |
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if (msix_present(&proxy->pci_dev)) {
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qemu_get_be16s(f, &proxy->vdev->config_vector); |
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} else {
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proxy->vdev->config_vector = VIRTIO_NO_VECTOR; |
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} |
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if (proxy->vdev->config_vector != VIRTIO_NO_VECTOR) {
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return msix_vector_use(&proxy->pci_dev, proxy->vdev->config_vector);
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} |
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/* Try to find out if the guest has bus master disabled, but is
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in ready state. Then we have a buggy guest OS. */
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if ((proxy->vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) &&
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!(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) { |
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proxy->flags |= VIRTIO_PCI_FLAG_BUS_MASTER_BUG; |
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} |
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return 0; |
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} |
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static int virtio_pci_load_queue(void * opaque, int n, QEMUFile *f) |
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{ |
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VirtIOPCIProxy *proxy = opaque; |
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uint16_t vector; |
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if (msix_present(&proxy->pci_dev)) {
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qemu_get_be16s(f, &vector); |
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} else {
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vector = VIRTIO_NO_VECTOR; |
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} |
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virtio_queue_set_vector(proxy->vdev, n, vector); |
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if (vector != VIRTIO_NO_VECTOR) {
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return msix_vector_use(&proxy->pci_dev, vector);
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} |
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return 0; |
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} |
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static int virtio_pci_set_host_notifier_internal(VirtIOPCIProxy *proxy, |
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int n, bool assign) |
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{ |
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VirtQueue *vq = virtio_get_queue(proxy->vdev, n); |
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EventNotifier *notifier = virtio_queue_get_host_notifier(vq); |
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int r;
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if (assign) {
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r = event_notifier_init(notifier, 1);
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if (r < 0) { |
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error_report("%s: unable to init event notifier: %d",
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__func__, r); |
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return r;
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} |
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r = kvm_set_ioeventfd_pio_word(event_notifier_get_fd(notifier), |
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proxy->addr + VIRTIO_PCI_QUEUE_NOTIFY, |
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n, assign); |
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if (r < 0) { |
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error_report("%s: unable to map ioeventfd: %d",
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__func__, r); |
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event_notifier_cleanup(notifier); |
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} |
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} else {
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r = kvm_set_ioeventfd_pio_word(event_notifier_get_fd(notifier), |
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proxy->addr + VIRTIO_PCI_QUEUE_NOTIFY, |
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n, assign); |
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if (r < 0) { |
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error_report("%s: unable to unmap ioeventfd: %d",
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__func__, r); |
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return r;
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} |
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/* Handle the race condition where the guest kicked and we deassigned
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* before we got around to handling the kick.
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*/
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if (event_notifier_test_and_clear(notifier)) {
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virtio_queue_notify_vq(vq); |
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} |
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event_notifier_cleanup(notifier); |
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} |
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return r;
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} |
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static void virtio_pci_host_notifier_read(void *opaque) |
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{ |
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VirtQueue *vq = opaque; |
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EventNotifier *n = virtio_queue_get_host_notifier(vq); |
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if (event_notifier_test_and_clear(n)) {
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virtio_queue_notify_vq(vq); |
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} |
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} |
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static void virtio_pci_set_host_notifier_fd_handler(VirtIOPCIProxy *proxy, |
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int n, bool assign) |
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{ |
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VirtQueue *vq = virtio_get_queue(proxy->vdev, n); |
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EventNotifier *notifier = virtio_queue_get_host_notifier(vq); |
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if (assign) {
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qemu_set_fd_handler(event_notifier_get_fd(notifier), |
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virtio_pci_host_notifier_read, NULL, vq);
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} else {
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qemu_set_fd_handler(event_notifier_get_fd(notifier), |
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NULL, NULL, NULL); |
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} |
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} |
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static void virtio_pci_start_ioeventfd(VirtIOPCIProxy *proxy) |
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{ |
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int n, r;
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if (!(proxy->flags & VIRTIO_PCI_FLAG_USE_IOEVENTFD) ||
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proxy->ioeventfd_disabled || |
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proxy->ioeventfd_started) { |
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return;
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} |
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for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) { |
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if (!virtio_queue_get_num(proxy->vdev, n)) {
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continue;
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} |
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r = virtio_pci_set_host_notifier_internal(proxy, n, true);
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if (r < 0) { |
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goto assign_error;
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} |
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virtio_pci_set_host_notifier_fd_handler(proxy, n, true);
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} |
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proxy->ioeventfd_started = true;
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return;
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assign_error:
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while (--n >= 0) { |
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if (!virtio_queue_get_num(proxy->vdev, n)) {
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continue;
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} |
285 |
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virtio_pci_set_host_notifier_fd_handler(proxy, n, false);
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r = virtio_pci_set_host_notifier_internal(proxy, n, false);
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assert(r >= 0);
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} |
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proxy->ioeventfd_started = false;
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error_report("%s: failed. Fallback to a userspace (slower).", __func__);
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} |
293 |
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static void virtio_pci_stop_ioeventfd(VirtIOPCIProxy *proxy) |
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{ |
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int r;
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int n;
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if (!proxy->ioeventfd_started) {
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return;
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} |
302 |
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for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) { |
304 |
if (!virtio_queue_get_num(proxy->vdev, n)) {
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305 |
continue;
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} |
307 |
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virtio_pci_set_host_notifier_fd_handler(proxy, n, false);
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r = virtio_pci_set_host_notifier_internal(proxy, n, false);
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assert(r >= 0);
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} |
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proxy->ioeventfd_started = false;
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} |
314 |
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static void virtio_pci_reset(DeviceState *d) |
316 |
{ |
317 |
VirtIOPCIProxy *proxy = container_of(d, VirtIOPCIProxy, pci_dev.qdev); |
318 |
virtio_pci_stop_ioeventfd(proxy); |
319 |
virtio_reset(proxy->vdev); |
320 |
msix_reset(&proxy->pci_dev); |
321 |
proxy->flags &= ~VIRTIO_PCI_FLAG_BUS_MASTER_BUG; |
322 |
} |
323 |
|
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static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val) |
325 |
{ |
326 |
VirtIOPCIProxy *proxy = opaque; |
327 |
VirtIODevice *vdev = proxy->vdev; |
328 |
target_phys_addr_t pa; |
329 |
|
330 |
switch (addr) {
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331 |
case VIRTIO_PCI_GUEST_FEATURES:
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332 |
/* Guest does not negotiate properly? We have to assume nothing. */
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if (val & (1 << VIRTIO_F_BAD_FEATURE)) { |
334 |
if (vdev->bad_features)
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val = proxy->host_features & vdev->bad_features(vdev); |
336 |
else
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337 |
val = 0;
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338 |
} |
339 |
if (vdev->set_features)
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340 |
vdev->set_features(vdev, val); |
341 |
vdev->guest_features = val; |
342 |
break;
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case VIRTIO_PCI_QUEUE_PFN:
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344 |
pa = (target_phys_addr_t)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT; |
345 |
if (pa == 0) { |
346 |
virtio_pci_stop_ioeventfd(proxy); |
347 |
virtio_reset(proxy->vdev); |
348 |
msix_unuse_all_vectors(&proxy->pci_dev); |
349 |
} |
350 |
else
|
351 |
virtio_queue_set_addr(vdev, vdev->queue_sel, pa); |
352 |
break;
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353 |
case VIRTIO_PCI_QUEUE_SEL:
|
354 |
if (val < VIRTIO_PCI_QUEUE_MAX)
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355 |
vdev->queue_sel = val; |
356 |
break;
|
357 |
case VIRTIO_PCI_QUEUE_NOTIFY:
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358 |
virtio_queue_notify(vdev, val); |
359 |
break;
|
360 |
case VIRTIO_PCI_STATUS:
|
361 |
if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
362 |
virtio_pci_stop_ioeventfd(proxy); |
363 |
} |
364 |
|
365 |
virtio_set_status(vdev, val & 0xFF);
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366 |
|
367 |
if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
|
368 |
virtio_pci_start_ioeventfd(proxy); |
369 |
} |
370 |
|
371 |
if (vdev->status == 0) { |
372 |
virtio_reset(proxy->vdev); |
373 |
msix_unuse_all_vectors(&proxy->pci_dev); |
374 |
} |
375 |
|
376 |
/* Linux before 2.6.34 sets the device as OK without enabling
|
377 |
the PCI device bus master bit. In this case we need to disable
|
378 |
some safety checks. */
|
379 |
if ((val & VIRTIO_CONFIG_S_DRIVER_OK) &&
|
380 |
!(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) { |
381 |
proxy->flags |= VIRTIO_PCI_FLAG_BUS_MASTER_BUG; |
382 |
} |
383 |
break;
|
384 |
case VIRTIO_MSI_CONFIG_VECTOR:
|
385 |
msix_vector_unuse(&proxy->pci_dev, vdev->config_vector); |
386 |
/* Make it possible for guest to discover an error took place. */
|
387 |
if (msix_vector_use(&proxy->pci_dev, val) < 0) |
388 |
val = VIRTIO_NO_VECTOR; |
389 |
vdev->config_vector = val; |
390 |
break;
|
391 |
case VIRTIO_MSI_QUEUE_VECTOR:
|
392 |
msix_vector_unuse(&proxy->pci_dev, |
393 |
virtio_queue_vector(vdev, vdev->queue_sel)); |
394 |
/* Make it possible for guest to discover an error took place. */
|
395 |
if (msix_vector_use(&proxy->pci_dev, val) < 0) |
396 |
val = VIRTIO_NO_VECTOR; |
397 |
virtio_queue_set_vector(vdev, vdev->queue_sel, val); |
398 |
break;
|
399 |
default:
|
400 |
error_report("%s: unexpected address 0x%x value 0x%x",
|
401 |
__func__, addr, val); |
402 |
break;
|
403 |
} |
404 |
} |
405 |
|
406 |
static uint32_t virtio_ioport_read(VirtIOPCIProxy *proxy, uint32_t addr)
|
407 |
{ |
408 |
VirtIODevice *vdev = proxy->vdev; |
409 |
uint32_t ret = 0xFFFFFFFF;
|
410 |
|
411 |
switch (addr) {
|
412 |
case VIRTIO_PCI_HOST_FEATURES:
|
413 |
ret = proxy->host_features; |
414 |
break;
|
415 |
case VIRTIO_PCI_GUEST_FEATURES:
|
416 |
ret = vdev->guest_features; |
417 |
break;
|
418 |
case VIRTIO_PCI_QUEUE_PFN:
|
419 |
ret = virtio_queue_get_addr(vdev, vdev->queue_sel) |
420 |
>> VIRTIO_PCI_QUEUE_ADDR_SHIFT; |
421 |
break;
|
422 |
case VIRTIO_PCI_QUEUE_NUM:
|
423 |
ret = virtio_queue_get_num(vdev, vdev->queue_sel); |
424 |
break;
|
425 |
case VIRTIO_PCI_QUEUE_SEL:
|
426 |
ret = vdev->queue_sel; |
427 |
break;
|
428 |
case VIRTIO_PCI_STATUS:
|
429 |
ret = vdev->status; |
430 |
break;
|
431 |
case VIRTIO_PCI_ISR:
|
432 |
/* reading from the ISR also clears it. */
|
433 |
ret = vdev->isr; |
434 |
vdev->isr = 0;
|
435 |
qemu_set_irq(proxy->pci_dev.irq[0], 0); |
436 |
break;
|
437 |
case VIRTIO_MSI_CONFIG_VECTOR:
|
438 |
ret = vdev->config_vector; |
439 |
break;
|
440 |
case VIRTIO_MSI_QUEUE_VECTOR:
|
441 |
ret = virtio_queue_vector(vdev, vdev->queue_sel); |
442 |
break;
|
443 |
default:
|
444 |
break;
|
445 |
} |
446 |
|
447 |
return ret;
|
448 |
} |
449 |
|
450 |
static uint32_t virtio_pci_config_readb(void *opaque, uint32_t addr) |
451 |
{ |
452 |
VirtIOPCIProxy *proxy = opaque; |
453 |
uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev); |
454 |
addr -= proxy->addr; |
455 |
if (addr < config)
|
456 |
return virtio_ioport_read(proxy, addr);
|
457 |
addr -= config; |
458 |
return virtio_config_readb(proxy->vdev, addr);
|
459 |
} |
460 |
|
461 |
static uint32_t virtio_pci_config_readw(void *opaque, uint32_t addr) |
462 |
{ |
463 |
VirtIOPCIProxy *proxy = opaque; |
464 |
uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev); |
465 |
addr -= proxy->addr; |
466 |
if (addr < config)
|
467 |
return virtio_ioport_read(proxy, addr);
|
468 |
addr -= config; |
469 |
return virtio_config_readw(proxy->vdev, addr);
|
470 |
} |
471 |
|
472 |
static uint32_t virtio_pci_config_readl(void *opaque, uint32_t addr) |
473 |
{ |
474 |
VirtIOPCIProxy *proxy = opaque; |
475 |
uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev); |
476 |
addr -= proxy->addr; |
477 |
if (addr < config)
|
478 |
return virtio_ioport_read(proxy, addr);
|
479 |
addr -= config; |
480 |
return virtio_config_readl(proxy->vdev, addr);
|
481 |
} |
482 |
|
483 |
static void virtio_pci_config_writeb(void *opaque, uint32_t addr, uint32_t val) |
484 |
{ |
485 |
VirtIOPCIProxy *proxy = opaque; |
486 |
uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev); |
487 |
addr -= proxy->addr; |
488 |
if (addr < config) {
|
489 |
virtio_ioport_write(proxy, addr, val); |
490 |
return;
|
491 |
} |
492 |
addr -= config; |
493 |
virtio_config_writeb(proxy->vdev, addr, val); |
494 |
} |
495 |
|
496 |
static void virtio_pci_config_writew(void *opaque, uint32_t addr, uint32_t val) |
497 |
{ |
498 |
VirtIOPCIProxy *proxy = opaque; |
499 |
uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev); |
500 |
addr -= proxy->addr; |
501 |
if (addr < config) {
|
502 |
virtio_ioport_write(proxy, addr, val); |
503 |
return;
|
504 |
} |
505 |
addr -= config; |
506 |
virtio_config_writew(proxy->vdev, addr, val); |
507 |
} |
508 |
|
509 |
static void virtio_pci_config_writel(void *opaque, uint32_t addr, uint32_t val) |
510 |
{ |
511 |
VirtIOPCIProxy *proxy = opaque; |
512 |
uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev); |
513 |
addr -= proxy->addr; |
514 |
if (addr < config) {
|
515 |
virtio_ioport_write(proxy, addr, val); |
516 |
return;
|
517 |
} |
518 |
addr -= config; |
519 |
virtio_config_writel(proxy->vdev, addr, val); |
520 |
} |
521 |
|
522 |
static void virtio_map(PCIDevice *pci_dev, int region_num, |
523 |
pcibus_t addr, pcibus_t size, int type)
|
524 |
{ |
525 |
VirtIOPCIProxy *proxy = container_of(pci_dev, VirtIOPCIProxy, pci_dev); |
526 |
VirtIODevice *vdev = proxy->vdev; |
527 |
unsigned config_len = VIRTIO_PCI_REGION_SIZE(pci_dev) + vdev->config_len;
|
528 |
|
529 |
proxy->addr = addr; |
530 |
|
531 |
register_ioport_write(addr, config_len, 1, virtio_pci_config_writeb, proxy);
|
532 |
register_ioport_write(addr, config_len, 2, virtio_pci_config_writew, proxy);
|
533 |
register_ioport_write(addr, config_len, 4, virtio_pci_config_writel, proxy);
|
534 |
register_ioport_read(addr, config_len, 1, virtio_pci_config_readb, proxy);
|
535 |
register_ioport_read(addr, config_len, 2, virtio_pci_config_readw, proxy);
|
536 |
register_ioport_read(addr, config_len, 4, virtio_pci_config_readl, proxy);
|
537 |
|
538 |
if (vdev->config_len)
|
539 |
vdev->get_config(vdev, vdev->config); |
540 |
} |
541 |
|
542 |
static void virtio_write_config(PCIDevice *pci_dev, uint32_t address, |
543 |
uint32_t val, int len)
|
544 |
{ |
545 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
546 |
|
547 |
if (PCI_COMMAND == address) {
|
548 |
if (!(val & PCI_COMMAND_MASTER)) {
|
549 |
if (!(proxy->flags & VIRTIO_PCI_FLAG_BUS_MASTER_BUG)) {
|
550 |
virtio_pci_stop_ioeventfd(proxy); |
551 |
virtio_set_status(proxy->vdev, |
552 |
proxy->vdev->status & ~VIRTIO_CONFIG_S_DRIVER_OK); |
553 |
} |
554 |
} |
555 |
} |
556 |
|
557 |
pci_default_write_config(pci_dev, address, val, len); |
558 |
msix_write_config(pci_dev, address, val, len); |
559 |
} |
560 |
|
561 |
static unsigned virtio_pci_get_features(void *opaque) |
562 |
{ |
563 |
VirtIOPCIProxy *proxy = opaque; |
564 |
return proxy->host_features;
|
565 |
} |
566 |
|
567 |
static void virtio_pci_guest_notifier_read(void *opaque) |
568 |
{ |
569 |
VirtQueue *vq = opaque; |
570 |
EventNotifier *n = virtio_queue_get_guest_notifier(vq); |
571 |
if (event_notifier_test_and_clear(n)) {
|
572 |
virtio_irq(vq); |
573 |
} |
574 |
} |
575 |
|
576 |
static int virtio_pci_set_guest_notifier(void *opaque, int n, bool assign) |
577 |
{ |
578 |
VirtIOPCIProxy *proxy = opaque; |
579 |
VirtQueue *vq = virtio_get_queue(proxy->vdev, n); |
580 |
EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); |
581 |
|
582 |
if (assign) {
|
583 |
int r = event_notifier_init(notifier, 0); |
584 |
if (r < 0) { |
585 |
return r;
|
586 |
} |
587 |
qemu_set_fd_handler(event_notifier_get_fd(notifier), |
588 |
virtio_pci_guest_notifier_read, NULL, vq);
|
589 |
} else {
|
590 |
qemu_set_fd_handler(event_notifier_get_fd(notifier), |
591 |
NULL, NULL, NULL); |
592 |
event_notifier_cleanup(notifier); |
593 |
} |
594 |
|
595 |
return 0; |
596 |
} |
597 |
|
598 |
static bool virtio_pci_query_guest_notifiers(void *opaque) |
599 |
{ |
600 |
VirtIOPCIProxy *proxy = opaque; |
601 |
return msix_enabled(&proxy->pci_dev);
|
602 |
} |
603 |
|
604 |
static int virtio_pci_set_guest_notifiers(void *opaque, bool assign) |
605 |
{ |
606 |
VirtIOPCIProxy *proxy = opaque; |
607 |
VirtIODevice *vdev = proxy->vdev; |
608 |
int r, n;
|
609 |
|
610 |
for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) { |
611 |
if (!virtio_queue_get_num(vdev, n)) {
|
612 |
break;
|
613 |
} |
614 |
|
615 |
r = virtio_pci_set_guest_notifier(opaque, n, assign); |
616 |
if (r < 0) { |
617 |
goto assign_error;
|
618 |
} |
619 |
} |
620 |
|
621 |
return 0; |
622 |
|
623 |
assign_error:
|
624 |
/* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */
|
625 |
while (--n >= 0) { |
626 |
virtio_pci_set_guest_notifier(opaque, n, !assign); |
627 |
} |
628 |
return r;
|
629 |
} |
630 |
|
631 |
static int virtio_pci_set_host_notifier(void *opaque, int n, bool assign) |
632 |
{ |
633 |
VirtIOPCIProxy *proxy = opaque; |
634 |
|
635 |
/* Stop using ioeventfd for virtqueue kick if the device starts using host
|
636 |
* notifiers. This makes it easy to avoid stepping on each others' toes.
|
637 |
*/
|
638 |
proxy->ioeventfd_disabled = assign; |
639 |
if (assign) {
|
640 |
virtio_pci_stop_ioeventfd(proxy); |
641 |
} |
642 |
/* We don't need to start here: it's not needed because backend
|
643 |
* currently only stops on status change away from ok,
|
644 |
* reset, vmstop and such. If we do add code to start here,
|
645 |
* need to check vmstate, device state etc. */
|
646 |
return virtio_pci_set_host_notifier_internal(proxy, n, assign);
|
647 |
} |
648 |
|
649 |
static void virtio_pci_vmstate_change(void *opaque, bool running) |
650 |
{ |
651 |
VirtIOPCIProxy *proxy = opaque; |
652 |
|
653 |
if (running) {
|
654 |
virtio_pci_start_ioeventfd(proxy); |
655 |
} else {
|
656 |
virtio_pci_stop_ioeventfd(proxy); |
657 |
} |
658 |
} |
659 |
|
660 |
static const VirtIOBindings virtio_pci_bindings = { |
661 |
.notify = virtio_pci_notify, |
662 |
.save_config = virtio_pci_save_config, |
663 |
.load_config = virtio_pci_load_config, |
664 |
.save_queue = virtio_pci_save_queue, |
665 |
.load_queue = virtio_pci_load_queue, |
666 |
.get_features = virtio_pci_get_features, |
667 |
.query_guest_notifiers = virtio_pci_query_guest_notifiers, |
668 |
.set_host_notifier = virtio_pci_set_host_notifier, |
669 |
.set_guest_notifiers = virtio_pci_set_guest_notifiers, |
670 |
.vmstate_change = virtio_pci_vmstate_change, |
671 |
}; |
672 |
|
673 |
static void virtio_init_pci(VirtIOPCIProxy *proxy, VirtIODevice *vdev, |
674 |
uint16_t vendor, uint16_t device, |
675 |
uint16_t class_code, uint8_t pif) |
676 |
{ |
677 |
uint8_t *config; |
678 |
uint32_t size; |
679 |
|
680 |
proxy->vdev = vdev; |
681 |
|
682 |
config = proxy->pci_dev.config; |
683 |
pci_config_set_vendor_id(config, vendor); |
684 |
pci_config_set_device_id(config, device); |
685 |
|
686 |
config[0x08] = VIRTIO_PCI_ABI_VERSION;
|
687 |
|
688 |
config[0x09] = pif;
|
689 |
pci_config_set_class(config, class_code); |
690 |
|
691 |
config[0x2c] = vendor & 0xFF; |
692 |
config[0x2d] = (vendor >> 8) & 0xFF; |
693 |
config[0x2e] = vdev->device_id & 0xFF; |
694 |
config[0x2f] = (vdev->device_id >> 8) & 0xFF; |
695 |
|
696 |
config[0x3d] = 1; |
697 |
|
698 |
if (vdev->nvectors && !msix_init(&proxy->pci_dev, vdev->nvectors, 1, 0)) { |
699 |
pci_register_bar(&proxy->pci_dev, 1,
|
700 |
msix_bar_size(&proxy->pci_dev), |
701 |
PCI_BASE_ADDRESS_SPACE_MEMORY, |
702 |
msix_mmio_map); |
703 |
} else
|
704 |
vdev->nvectors = 0;
|
705 |
|
706 |
proxy->pci_dev.config_write = virtio_write_config; |
707 |
|
708 |
size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev) + vdev->config_len; |
709 |
if (size & (size-1)) |
710 |
size = 1 << qemu_fls(size);
|
711 |
|
712 |
pci_register_bar(&proxy->pci_dev, 0, size, PCI_BASE_ADDRESS_SPACE_IO,
|
713 |
virtio_map); |
714 |
|
715 |
if (!kvm_has_many_ioeventfds()) {
|
716 |
proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD; |
717 |
} |
718 |
|
719 |
virtio_bind_device(vdev, &virtio_pci_bindings, proxy); |
720 |
proxy->host_features |= 0x1 << VIRTIO_F_NOTIFY_ON_EMPTY;
|
721 |
proxy->host_features |= 0x1 << VIRTIO_F_BAD_FEATURE;
|
722 |
proxy->host_features = vdev->get_features(vdev, proxy->host_features); |
723 |
} |
724 |
|
725 |
static int virtio_blk_init_pci(PCIDevice *pci_dev) |
726 |
{ |
727 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
728 |
VirtIODevice *vdev; |
729 |
|
730 |
if (proxy->class_code != PCI_CLASS_STORAGE_SCSI &&
|
731 |
proxy->class_code != PCI_CLASS_STORAGE_OTHER) |
732 |
proxy->class_code = PCI_CLASS_STORAGE_SCSI; |
733 |
|
734 |
vdev = virtio_blk_init(&pci_dev->qdev, &proxy->block); |
735 |
if (!vdev) {
|
736 |
return -1; |
737 |
} |
738 |
vdev->nvectors = proxy->nvectors; |
739 |
virtio_init_pci(proxy, vdev, |
740 |
PCI_VENDOR_ID_REDHAT_QUMRANET, |
741 |
PCI_DEVICE_ID_VIRTIO_BLOCK, |
742 |
proxy->class_code, 0x00);
|
743 |
/* make the actual value visible */
|
744 |
proxy->nvectors = vdev->nvectors; |
745 |
return 0; |
746 |
} |
747 |
|
748 |
static int virtio_exit_pci(PCIDevice *pci_dev) |
749 |
{ |
750 |
return msix_uninit(pci_dev);
|
751 |
} |
752 |
|
753 |
static int virtio_blk_exit_pci(PCIDevice *pci_dev) |
754 |
{ |
755 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
756 |
|
757 |
virtio_pci_stop_ioeventfd(proxy); |
758 |
virtio_blk_exit(proxy->vdev); |
759 |
blockdev_mark_auto_del(proxy->block.bs); |
760 |
return virtio_exit_pci(pci_dev);
|
761 |
} |
762 |
|
763 |
static int virtio_serial_init_pci(PCIDevice *pci_dev) |
764 |
{ |
765 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
766 |
VirtIODevice *vdev; |
767 |
|
768 |
if (proxy->class_code != PCI_CLASS_COMMUNICATION_OTHER &&
|
769 |
proxy->class_code != PCI_CLASS_DISPLAY_OTHER && /* qemu 0.10 */
|
770 |
proxy->class_code != PCI_CLASS_OTHERS) /* qemu-kvm */
|
771 |
proxy->class_code = PCI_CLASS_COMMUNICATION_OTHER; |
772 |
|
773 |
vdev = virtio_serial_init(&pci_dev->qdev, proxy->max_virtserial_ports); |
774 |
if (!vdev) {
|
775 |
return -1; |
776 |
} |
777 |
vdev->nvectors = proxy->nvectors == DEV_NVECTORS_UNSPECIFIED |
778 |
? proxy->max_virtserial_ports + 1
|
779 |
: proxy->nvectors; |
780 |
virtio_init_pci(proxy, vdev, |
781 |
PCI_VENDOR_ID_REDHAT_QUMRANET, |
782 |
PCI_DEVICE_ID_VIRTIO_CONSOLE, |
783 |
proxy->class_code, 0x00);
|
784 |
proxy->nvectors = vdev->nvectors; |
785 |
return 0; |
786 |
} |
787 |
|
788 |
static int virtio_serial_exit_pci(PCIDevice *pci_dev) |
789 |
{ |
790 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
791 |
|
792 |
virtio_serial_exit(proxy->vdev); |
793 |
return virtio_exit_pci(pci_dev);
|
794 |
} |
795 |
|
796 |
static int virtio_net_init_pci(PCIDevice *pci_dev) |
797 |
{ |
798 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
799 |
VirtIODevice *vdev; |
800 |
|
801 |
vdev = virtio_net_init(&pci_dev->qdev, &proxy->nic, &proxy->net); |
802 |
|
803 |
vdev->nvectors = proxy->nvectors; |
804 |
virtio_init_pci(proxy, vdev, |
805 |
PCI_VENDOR_ID_REDHAT_QUMRANET, |
806 |
PCI_DEVICE_ID_VIRTIO_NET, |
807 |
PCI_CLASS_NETWORK_ETHERNET, |
808 |
0x00);
|
809 |
|
810 |
/* make the actual value visible */
|
811 |
proxy->nvectors = vdev->nvectors; |
812 |
return 0; |
813 |
} |
814 |
|
815 |
static int virtio_net_exit_pci(PCIDevice *pci_dev) |
816 |
{ |
817 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
818 |
|
819 |
virtio_pci_stop_ioeventfd(proxy); |
820 |
virtio_net_exit(proxy->vdev); |
821 |
return virtio_exit_pci(pci_dev);
|
822 |
} |
823 |
|
824 |
static int virtio_balloon_init_pci(PCIDevice *pci_dev) |
825 |
{ |
826 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
827 |
VirtIODevice *vdev; |
828 |
|
829 |
vdev = virtio_balloon_init(&pci_dev->qdev); |
830 |
virtio_init_pci(proxy, vdev, |
831 |
PCI_VENDOR_ID_REDHAT_QUMRANET, |
832 |
PCI_DEVICE_ID_VIRTIO_BALLOON, |
833 |
PCI_CLASS_MEMORY_RAM, |
834 |
0x00);
|
835 |
return 0; |
836 |
} |
837 |
|
838 |
#ifdef CONFIG_VIRTFS
|
839 |
static int virtio_9p_init_pci(PCIDevice *pci_dev) |
840 |
{ |
841 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
842 |
VirtIODevice *vdev; |
843 |
|
844 |
vdev = virtio_9p_init(&pci_dev->qdev, &proxy->fsconf); |
845 |
vdev->nvectors = proxy->nvectors; |
846 |
virtio_init_pci(proxy, vdev, |
847 |
PCI_VENDOR_ID_REDHAT_QUMRANET, |
848 |
0x1009,
|
849 |
0x2,
|
850 |
0x00);
|
851 |
/* make the actual value visible */
|
852 |
proxy->nvectors = vdev->nvectors; |
853 |
return 0; |
854 |
} |
855 |
#endif
|
856 |
|
857 |
static PCIDeviceInfo virtio_info[] = {
|
858 |
{ |
859 |
.qdev.name = "virtio-blk-pci",
|
860 |
.qdev.alias = "virtio-blk",
|
861 |
.qdev.size = sizeof(VirtIOPCIProxy),
|
862 |
.init = virtio_blk_init_pci, |
863 |
.exit = virtio_blk_exit_pci, |
864 |
.qdev.props = (Property[]) { |
865 |
DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0), |
866 |
DEFINE_BLOCK_PROPERTIES(VirtIOPCIProxy, block), |
867 |
DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
|
868 |
VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
|
869 |
DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2), |
870 |
DEFINE_VIRTIO_BLK_FEATURES(VirtIOPCIProxy, host_features), |
871 |
DEFINE_PROP_END_OF_LIST(), |
872 |
}, |
873 |
.qdev.reset = virtio_pci_reset, |
874 |
},{ |
875 |
.qdev.name = "virtio-net-pci",
|
876 |
.qdev.size = sizeof(VirtIOPCIProxy),
|
877 |
.init = virtio_net_init_pci, |
878 |
.exit = virtio_net_exit_pci, |
879 |
.romfile = "pxe-virtio.bin",
|
880 |
.qdev.props = (Property[]) { |
881 |
DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
|
882 |
VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, false),
|
883 |
DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 3), |
884 |
DEFINE_VIRTIO_NET_FEATURES(VirtIOPCIProxy, host_features), |
885 |
DEFINE_NIC_PROPERTIES(VirtIOPCIProxy, nic), |
886 |
DEFINE_PROP_UINT32("x-txtimer", VirtIOPCIProxy,
|
887 |
net.txtimer, TX_TIMER_INTERVAL), |
888 |
DEFINE_PROP_INT32("x-txburst", VirtIOPCIProxy,
|
889 |
net.txburst, TX_BURST), |
890 |
DEFINE_PROP_STRING("tx", VirtIOPCIProxy, net.tx),
|
891 |
DEFINE_PROP_END_OF_LIST(), |
892 |
}, |
893 |
.qdev.reset = virtio_pci_reset, |
894 |
},{ |
895 |
.qdev.name = "virtio-serial-pci",
|
896 |
.qdev.alias = "virtio-serial",
|
897 |
.qdev.size = sizeof(VirtIOPCIProxy),
|
898 |
.init = virtio_serial_init_pci, |
899 |
.exit = virtio_serial_exit_pci, |
900 |
.qdev.props = (Property[]) { |
901 |
DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
|
902 |
DEV_NVECTORS_UNSPECIFIED), |
903 |
DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0), |
904 |
DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features), |
905 |
DEFINE_PROP_UINT32("max_ports", VirtIOPCIProxy, max_virtserial_ports,
|
906 |
31),
|
907 |
DEFINE_PROP_END_OF_LIST(), |
908 |
}, |
909 |
.qdev.reset = virtio_pci_reset, |
910 |
},{ |
911 |
.qdev.name = "virtio-balloon-pci",
|
912 |
.qdev.size = sizeof(VirtIOPCIProxy),
|
913 |
.init = virtio_balloon_init_pci, |
914 |
.exit = virtio_exit_pci, |
915 |
.qdev.props = (Property[]) { |
916 |
DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features), |
917 |
DEFINE_PROP_END_OF_LIST(), |
918 |
}, |
919 |
.qdev.reset = virtio_pci_reset, |
920 |
},{ |
921 |
#ifdef CONFIG_VIRTFS
|
922 |
.qdev.name = "virtio-9p-pci",
|
923 |
.qdev.size = sizeof(VirtIOPCIProxy),
|
924 |
.init = virtio_9p_init_pci, |
925 |
.qdev.props = (Property[]) { |
926 |
DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2), |
927 |
DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features), |
928 |
DEFINE_PROP_STRING("mount_tag", VirtIOPCIProxy, fsconf.tag),
|
929 |
DEFINE_PROP_STRING("fsdev", VirtIOPCIProxy, fsconf.fsdev_id),
|
930 |
DEFINE_PROP_END_OF_LIST(), |
931 |
}, |
932 |
}, { |
933 |
#endif
|
934 |
/* end of list */
|
935 |
} |
936 |
}; |
937 |
|
938 |
static void virtio_pci_register_devices(void) |
939 |
{ |
940 |
pci_qdev_register_many(virtio_info); |
941 |
} |
942 |
|
943 |
device_init(virtio_pci_register_devices) |