root / hw / virtio-pci.c @ a1bc20df
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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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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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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 "virtio-serial.h" |
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#include "virtio-scsi.h" |
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#include "pci.h" |
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#include "qemu-error.h" |
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#include "msi.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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#include "virtio-pci.h" |
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#include "range.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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/* 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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/* 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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/* HACK for virtio to determine if it's running a big endian guest */
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bool virtio_is_big_endian(void); |
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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_unuse_all_vectors(&proxy->pci_dev); |
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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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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, bool set_handler) |
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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 = 0; |
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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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virtio_queue_set_host_notifier_fd_handler(vq, true, set_handler);
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memory_region_add_eventfd(&proxy->bar, VIRTIO_PCI_QUEUE_NOTIFY, 2,
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true, n, notifier);
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} else {
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memory_region_del_eventfd(&proxy->bar, VIRTIO_PCI_QUEUE_NOTIFY, 2,
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true, n, notifier);
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virtio_queue_set_host_notifier_fd_handler(vq, false, false); |
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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_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, true); |
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if (r < 0) { |
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goto assign_error;
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} |
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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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} |
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r = virtio_pci_set_host_notifier_internal(proxy, n, false, 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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} |
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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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} |
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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, false, false); |
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assert(r >= 0);
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} |
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proxy->ioeventfd_started = false;
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} |
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void virtio_pci_reset(DeviceState *d)
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{ |
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VirtIOPCIProxy *proxy = container_of(d, VirtIOPCIProxy, pci_dev.qdev); |
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virtio_pci_stop_ioeventfd(proxy); |
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virtio_reset(proxy->vdev); |
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msix_unuse_all_vectors(&proxy->pci_dev); |
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proxy->flags &= ~VIRTIO_PCI_FLAG_BUS_MASTER_BUG; |
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} |
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static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val) |
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{ |
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VirtIOPCIProxy *proxy = opaque; |
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VirtIODevice *vdev = proxy->vdev; |
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hwaddr pa; |
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switch (addr) {
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case VIRTIO_PCI_GUEST_FEATURES:
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/* Guest does not negotiate properly? We have to assume nothing. */
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if (val & (1 << VIRTIO_F_BAD_FEATURE)) { |
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val = vdev->bad_features ? vdev->bad_features(vdev) : 0;
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} |
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virtio_set_features(vdev, val); |
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break;
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case VIRTIO_PCI_QUEUE_PFN:
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pa = (hwaddr)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT; |
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if (pa == 0) { |
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virtio_pci_stop_ioeventfd(proxy); |
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virtio_reset(proxy->vdev); |
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msix_unuse_all_vectors(&proxy->pci_dev); |
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} |
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else
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virtio_queue_set_addr(vdev, vdev->queue_sel, pa); |
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break;
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case VIRTIO_PCI_QUEUE_SEL:
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if (val < VIRTIO_PCI_QUEUE_MAX)
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vdev->queue_sel = val; |
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break;
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case VIRTIO_PCI_QUEUE_NOTIFY:
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if (val < VIRTIO_PCI_QUEUE_MAX) {
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virtio_queue_notify(vdev, val); |
285 |
} |
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break;
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case VIRTIO_PCI_STATUS:
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if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) {
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virtio_pci_stop_ioeventfd(proxy); |
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} |
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virtio_set_status(vdev, val & 0xFF);
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if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
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virtio_pci_start_ioeventfd(proxy); |
296 |
} |
297 |
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if (vdev->status == 0) { |
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virtio_reset(proxy->vdev); |
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msix_unuse_all_vectors(&proxy->pci_dev); |
301 |
} |
302 |
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/* Linux before 2.6.34 sets the device as OK without enabling
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the PCI device bus master bit. In this case we need to disable
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some safety checks. */
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if ((val & 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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break;
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case VIRTIO_MSI_CONFIG_VECTOR:
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msix_vector_unuse(&proxy->pci_dev, vdev->config_vector); |
313 |
/* Make it possible for guest to discover an error took place. */
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if (msix_vector_use(&proxy->pci_dev, val) < 0) |
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val = VIRTIO_NO_VECTOR; |
316 |
vdev->config_vector = val; |
317 |
break;
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case VIRTIO_MSI_QUEUE_VECTOR:
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msix_vector_unuse(&proxy->pci_dev, |
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virtio_queue_vector(vdev, vdev->queue_sel)); |
321 |
/* Make it possible for guest to discover an error took place. */
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if (msix_vector_use(&proxy->pci_dev, val) < 0) |
323 |
val = VIRTIO_NO_VECTOR; |
324 |
virtio_queue_set_vector(vdev, vdev->queue_sel, val); |
325 |
break;
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default:
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327 |
error_report("%s: unexpected address 0x%x value 0x%x",
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__func__, addr, val); |
329 |
break;
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330 |
} |
331 |
} |
332 |
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static uint32_t virtio_ioport_read(VirtIOPCIProxy *proxy, uint32_t addr)
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{ |
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VirtIODevice *vdev = proxy->vdev; |
336 |
uint32_t ret = 0xFFFFFFFF;
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337 |
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338 |
switch (addr) {
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case VIRTIO_PCI_HOST_FEATURES:
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ret = proxy->host_features; |
341 |
break;
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case VIRTIO_PCI_GUEST_FEATURES:
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343 |
ret = vdev->guest_features; |
344 |
break;
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345 |
case VIRTIO_PCI_QUEUE_PFN:
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346 |
ret = virtio_queue_get_addr(vdev, vdev->queue_sel) |
347 |
>> VIRTIO_PCI_QUEUE_ADDR_SHIFT; |
348 |
break;
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349 |
case VIRTIO_PCI_QUEUE_NUM:
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350 |
ret = virtio_queue_get_num(vdev, vdev->queue_sel); |
351 |
break;
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352 |
case VIRTIO_PCI_QUEUE_SEL:
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ret = vdev->queue_sel; |
354 |
break;
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355 |
case VIRTIO_PCI_STATUS:
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356 |
ret = vdev->status; |
357 |
break;
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358 |
case VIRTIO_PCI_ISR:
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359 |
/* reading from the ISR also clears it. */
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360 |
ret = vdev->isr; |
361 |
vdev->isr = 0;
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362 |
qemu_set_irq(proxy->pci_dev.irq[0], 0); |
363 |
break;
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364 |
case VIRTIO_MSI_CONFIG_VECTOR:
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365 |
ret = vdev->config_vector; |
366 |
break;
|
367 |
case VIRTIO_MSI_QUEUE_VECTOR:
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368 |
ret = virtio_queue_vector(vdev, vdev->queue_sel); |
369 |
break;
|
370 |
default:
|
371 |
break;
|
372 |
} |
373 |
|
374 |
return ret;
|
375 |
} |
376 |
|
377 |
static uint64_t virtio_pci_config_read(void *opaque, hwaddr addr, |
378 |
unsigned size)
|
379 |
{ |
380 |
VirtIOPCIProxy *proxy = opaque; |
381 |
uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev); |
382 |
uint64_t val = 0;
|
383 |
if (addr < config) {
|
384 |
return virtio_ioport_read(proxy, addr);
|
385 |
} |
386 |
addr -= config; |
387 |
|
388 |
switch (size) {
|
389 |
case 1: |
390 |
val = virtio_config_readb(proxy->vdev, addr); |
391 |
break;
|
392 |
case 2: |
393 |
val = virtio_config_readw(proxy->vdev, addr); |
394 |
if (virtio_is_big_endian()) {
|
395 |
val = bswap16(val); |
396 |
} |
397 |
break;
|
398 |
case 4: |
399 |
val = virtio_config_readl(proxy->vdev, addr); |
400 |
if (virtio_is_big_endian()) {
|
401 |
val = bswap32(val); |
402 |
} |
403 |
break;
|
404 |
} |
405 |
return val;
|
406 |
} |
407 |
|
408 |
static void virtio_pci_config_write(void *opaque, hwaddr addr, |
409 |
uint64_t val, unsigned size)
|
410 |
{ |
411 |
VirtIOPCIProxy *proxy = opaque; |
412 |
uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev); |
413 |
if (addr < config) {
|
414 |
virtio_ioport_write(proxy, addr, val); |
415 |
return;
|
416 |
} |
417 |
addr -= config; |
418 |
/*
|
419 |
* Virtio-PCI is odd. Ioports are LE but config space is target native
|
420 |
* endian.
|
421 |
*/
|
422 |
switch (size) {
|
423 |
case 1: |
424 |
virtio_config_writeb(proxy->vdev, addr, val); |
425 |
break;
|
426 |
case 2: |
427 |
if (virtio_is_big_endian()) {
|
428 |
val = bswap16(val); |
429 |
} |
430 |
virtio_config_writew(proxy->vdev, addr, val); |
431 |
break;
|
432 |
case 4: |
433 |
if (virtio_is_big_endian()) {
|
434 |
val = bswap32(val); |
435 |
} |
436 |
virtio_config_writel(proxy->vdev, addr, val); |
437 |
break;
|
438 |
} |
439 |
} |
440 |
|
441 |
static const MemoryRegionOps virtio_pci_config_ops = { |
442 |
.read = virtio_pci_config_read, |
443 |
.write = virtio_pci_config_write, |
444 |
.impl = { |
445 |
.min_access_size = 1,
|
446 |
.max_access_size = 4,
|
447 |
}, |
448 |
.endianness = DEVICE_LITTLE_ENDIAN, |
449 |
}; |
450 |
|
451 |
static void virtio_write_config(PCIDevice *pci_dev, uint32_t address, |
452 |
uint32_t val, int len)
|
453 |
{ |
454 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
455 |
|
456 |
pci_default_write_config(pci_dev, address, val, len); |
457 |
|
458 |
if (range_covers_byte(address, len, PCI_COMMAND) &&
|
459 |
!(pci_dev->config[PCI_COMMAND] & PCI_COMMAND_MASTER) && |
460 |
!(proxy->flags & VIRTIO_PCI_FLAG_BUS_MASTER_BUG)) { |
461 |
virtio_pci_stop_ioeventfd(proxy); |
462 |
virtio_set_status(proxy->vdev, |
463 |
proxy->vdev->status & ~VIRTIO_CONFIG_S_DRIVER_OK); |
464 |
} |
465 |
} |
466 |
|
467 |
static unsigned virtio_pci_get_features(void *opaque) |
468 |
{ |
469 |
VirtIOPCIProxy *proxy = opaque; |
470 |
return proxy->host_features;
|
471 |
} |
472 |
|
473 |
static int kvm_virtio_pci_vq_vector_use(VirtIOPCIProxy *proxy, |
474 |
unsigned int queue_no, |
475 |
unsigned int vector, |
476 |
MSIMessage msg) |
477 |
{ |
478 |
VirtQueue *vq = virtio_get_queue(proxy->vdev, queue_no); |
479 |
EventNotifier *n = virtio_queue_get_guest_notifier(vq); |
480 |
VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector]; |
481 |
int ret;
|
482 |
|
483 |
if (irqfd->users == 0) { |
484 |
ret = kvm_irqchip_add_msi_route(kvm_state, msg); |
485 |
if (ret < 0) { |
486 |
return ret;
|
487 |
} |
488 |
irqfd->virq = ret; |
489 |
} |
490 |
irqfd->users++; |
491 |
|
492 |
ret = kvm_irqchip_add_irqfd_notifier(kvm_state, n, irqfd->virq); |
493 |
if (ret < 0) { |
494 |
if (--irqfd->users == 0) { |
495 |
kvm_irqchip_release_virq(kvm_state, irqfd->virq); |
496 |
} |
497 |
return ret;
|
498 |
} |
499 |
|
500 |
virtio_queue_set_guest_notifier_fd_handler(vq, true, true); |
501 |
return 0; |
502 |
} |
503 |
|
504 |
static void kvm_virtio_pci_vq_vector_release(VirtIOPCIProxy *proxy, |
505 |
unsigned int queue_no, |
506 |
unsigned int vector) |
507 |
{ |
508 |
VirtQueue *vq = virtio_get_queue(proxy->vdev, queue_no); |
509 |
EventNotifier *n = virtio_queue_get_guest_notifier(vq); |
510 |
VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector]; |
511 |
int ret;
|
512 |
|
513 |
ret = kvm_irqchip_remove_irqfd_notifier(kvm_state, n, irqfd->virq); |
514 |
assert(ret == 0);
|
515 |
|
516 |
if (--irqfd->users == 0) { |
517 |
kvm_irqchip_release_virq(kvm_state, irqfd->virq); |
518 |
} |
519 |
|
520 |
virtio_queue_set_guest_notifier_fd_handler(vq, true, false); |
521 |
} |
522 |
|
523 |
static int kvm_virtio_pci_vector_use(PCIDevice *dev, unsigned vector, |
524 |
MSIMessage msg) |
525 |
{ |
526 |
VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev); |
527 |
VirtIODevice *vdev = proxy->vdev; |
528 |
int ret, queue_no;
|
529 |
|
530 |
for (queue_no = 0; queue_no < VIRTIO_PCI_QUEUE_MAX; queue_no++) { |
531 |
if (!virtio_queue_get_num(vdev, queue_no)) {
|
532 |
break;
|
533 |
} |
534 |
if (virtio_queue_vector(vdev, queue_no) != vector) {
|
535 |
continue;
|
536 |
} |
537 |
ret = kvm_virtio_pci_vq_vector_use(proxy, queue_no, vector, msg); |
538 |
if (ret < 0) { |
539 |
goto undo;
|
540 |
} |
541 |
} |
542 |
return 0; |
543 |
|
544 |
undo:
|
545 |
while (--queue_no >= 0) { |
546 |
if (virtio_queue_vector(vdev, queue_no) != vector) {
|
547 |
continue;
|
548 |
} |
549 |
kvm_virtio_pci_vq_vector_release(proxy, queue_no, vector); |
550 |
} |
551 |
return ret;
|
552 |
} |
553 |
|
554 |
static void kvm_virtio_pci_vector_release(PCIDevice *dev, unsigned vector) |
555 |
{ |
556 |
VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev); |
557 |
VirtIODevice *vdev = proxy->vdev; |
558 |
int queue_no;
|
559 |
|
560 |
for (queue_no = 0; queue_no < VIRTIO_PCI_QUEUE_MAX; queue_no++) { |
561 |
if (!virtio_queue_get_num(vdev, queue_no)) {
|
562 |
break;
|
563 |
} |
564 |
if (virtio_queue_vector(vdev, queue_no) != vector) {
|
565 |
continue;
|
566 |
} |
567 |
kvm_virtio_pci_vq_vector_release(proxy, queue_no, vector); |
568 |
} |
569 |
} |
570 |
|
571 |
static int virtio_pci_set_guest_notifier(void *opaque, int n, bool assign) |
572 |
{ |
573 |
VirtIOPCIProxy *proxy = opaque; |
574 |
VirtQueue *vq = virtio_get_queue(proxy->vdev, n); |
575 |
EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); |
576 |
|
577 |
if (assign) {
|
578 |
int r = event_notifier_init(notifier, 0); |
579 |
if (r < 0) { |
580 |
return r;
|
581 |
} |
582 |
virtio_queue_set_guest_notifier_fd_handler(vq, true, false); |
583 |
} else {
|
584 |
virtio_queue_set_guest_notifier_fd_handler(vq, false, false); |
585 |
event_notifier_cleanup(notifier); |
586 |
} |
587 |
|
588 |
return 0; |
589 |
} |
590 |
|
591 |
static bool virtio_pci_query_guest_notifiers(void *opaque) |
592 |
{ |
593 |
VirtIOPCIProxy *proxy = opaque; |
594 |
return msix_enabled(&proxy->pci_dev);
|
595 |
} |
596 |
|
597 |
static int virtio_pci_set_guest_notifiers(void *opaque, bool assign) |
598 |
{ |
599 |
VirtIOPCIProxy *proxy = opaque; |
600 |
VirtIODevice *vdev = proxy->vdev; |
601 |
int r, n;
|
602 |
|
603 |
/* Must unset vector notifier while guest notifier is still assigned */
|
604 |
if (kvm_msi_via_irqfd_enabled() && !assign) {
|
605 |
msix_unset_vector_notifiers(&proxy->pci_dev); |
606 |
g_free(proxy->vector_irqfd); |
607 |
proxy->vector_irqfd = NULL;
|
608 |
} |
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 |
/* Must set vector notifier after guest notifier has been assigned */
|
622 |
if (kvm_msi_via_irqfd_enabled() && assign) {
|
623 |
proxy->vector_irqfd = |
624 |
g_malloc0(sizeof(*proxy->vector_irqfd) *
|
625 |
msix_nr_vectors_allocated(&proxy->pci_dev)); |
626 |
r = msix_set_vector_notifiers(&proxy->pci_dev, |
627 |
kvm_virtio_pci_vector_use, |
628 |
kvm_virtio_pci_vector_release); |
629 |
if (r < 0) { |
630 |
goto assign_error;
|
631 |
} |
632 |
} |
633 |
|
634 |
return 0; |
635 |
|
636 |
assign_error:
|
637 |
/* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */
|
638 |
assert(assign); |
639 |
while (--n >= 0) { |
640 |
virtio_pci_set_guest_notifier(opaque, n, !assign); |
641 |
} |
642 |
return r;
|
643 |
} |
644 |
|
645 |
static int virtio_pci_set_host_notifier(void *opaque, int n, bool assign) |
646 |
{ |
647 |
VirtIOPCIProxy *proxy = opaque; |
648 |
|
649 |
/* Stop using ioeventfd for virtqueue kick if the device starts using host
|
650 |
* notifiers. This makes it easy to avoid stepping on each others' toes.
|
651 |
*/
|
652 |
proxy->ioeventfd_disabled = assign; |
653 |
if (assign) {
|
654 |
virtio_pci_stop_ioeventfd(proxy); |
655 |
} |
656 |
/* We don't need to start here: it's not needed because backend
|
657 |
* currently only stops on status change away from ok,
|
658 |
* reset, vmstop and such. If we do add code to start here,
|
659 |
* need to check vmstate, device state etc. */
|
660 |
return virtio_pci_set_host_notifier_internal(proxy, n, assign, false); |
661 |
} |
662 |
|
663 |
static void virtio_pci_vmstate_change(void *opaque, bool running) |
664 |
{ |
665 |
VirtIOPCIProxy *proxy = opaque; |
666 |
|
667 |
if (running) {
|
668 |
/* Try to find out if the guest has bus master disabled, but is
|
669 |
in ready state. Then we have a buggy guest OS. */
|
670 |
if ((proxy->vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) &&
|
671 |
!(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) { |
672 |
proxy->flags |= VIRTIO_PCI_FLAG_BUS_MASTER_BUG; |
673 |
} |
674 |
virtio_pci_start_ioeventfd(proxy); |
675 |
} else {
|
676 |
virtio_pci_stop_ioeventfd(proxy); |
677 |
} |
678 |
} |
679 |
|
680 |
static const VirtIOBindings virtio_pci_bindings = { |
681 |
.notify = virtio_pci_notify, |
682 |
.save_config = virtio_pci_save_config, |
683 |
.load_config = virtio_pci_load_config, |
684 |
.save_queue = virtio_pci_save_queue, |
685 |
.load_queue = virtio_pci_load_queue, |
686 |
.get_features = virtio_pci_get_features, |
687 |
.query_guest_notifiers = virtio_pci_query_guest_notifiers, |
688 |
.set_host_notifier = virtio_pci_set_host_notifier, |
689 |
.set_guest_notifiers = virtio_pci_set_guest_notifiers, |
690 |
.vmstate_change = virtio_pci_vmstate_change, |
691 |
}; |
692 |
|
693 |
void virtio_init_pci(VirtIOPCIProxy *proxy, VirtIODevice *vdev)
|
694 |
{ |
695 |
uint8_t *config; |
696 |
uint32_t size; |
697 |
|
698 |
proxy->vdev = vdev; |
699 |
|
700 |
config = proxy->pci_dev.config; |
701 |
|
702 |
if (proxy->class_code) {
|
703 |
pci_config_set_class(config, proxy->class_code); |
704 |
} |
705 |
pci_set_word(config + PCI_SUBSYSTEM_VENDOR_ID, |
706 |
pci_get_word(config + PCI_VENDOR_ID)); |
707 |
pci_set_word(config + PCI_SUBSYSTEM_ID, vdev->device_id); |
708 |
config[PCI_INTERRUPT_PIN] = 1;
|
709 |
|
710 |
if (vdev->nvectors &&
|
711 |
msix_init_exclusive_bar(&proxy->pci_dev, vdev->nvectors, 1)) {
|
712 |
vdev->nvectors = 0;
|
713 |
} |
714 |
|
715 |
proxy->pci_dev.config_write = virtio_write_config; |
716 |
|
717 |
size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev) + vdev->config_len; |
718 |
if (size & (size-1)) |
719 |
size = 1 << qemu_fls(size);
|
720 |
|
721 |
memory_region_init_io(&proxy->bar, &virtio_pci_config_ops, proxy, |
722 |
"virtio-pci", size);
|
723 |
pci_register_bar(&proxy->pci_dev, 0, PCI_BASE_ADDRESS_SPACE_IO,
|
724 |
&proxy->bar); |
725 |
|
726 |
if (!kvm_has_many_ioeventfds()) {
|
727 |
proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD; |
728 |
} |
729 |
|
730 |
virtio_bind_device(vdev, &virtio_pci_bindings, proxy); |
731 |
proxy->host_features |= 0x1 << VIRTIO_F_NOTIFY_ON_EMPTY;
|
732 |
proxy->host_features |= 0x1 << VIRTIO_F_BAD_FEATURE;
|
733 |
proxy->host_features = vdev->get_features(vdev, proxy->host_features); |
734 |
} |
735 |
|
736 |
static int virtio_blk_init_pci(PCIDevice *pci_dev) |
737 |
{ |
738 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
739 |
VirtIODevice *vdev; |
740 |
|
741 |
if (proxy->class_code != PCI_CLASS_STORAGE_SCSI &&
|
742 |
proxy->class_code != PCI_CLASS_STORAGE_OTHER) |
743 |
proxy->class_code = PCI_CLASS_STORAGE_SCSI; |
744 |
|
745 |
vdev = virtio_blk_init(&pci_dev->qdev, &proxy->blk); |
746 |
if (!vdev) {
|
747 |
return -1; |
748 |
} |
749 |
vdev->nvectors = proxy->nvectors; |
750 |
virtio_init_pci(proxy, vdev); |
751 |
/* make the actual value visible */
|
752 |
proxy->nvectors = vdev->nvectors; |
753 |
return 0; |
754 |
} |
755 |
|
756 |
static void virtio_exit_pci(PCIDevice *pci_dev) |
757 |
{ |
758 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
759 |
|
760 |
memory_region_destroy(&proxy->bar); |
761 |
msix_uninit_exclusive_bar(pci_dev); |
762 |
} |
763 |
|
764 |
static void virtio_blk_exit_pci(PCIDevice *pci_dev) |
765 |
{ |
766 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
767 |
|
768 |
virtio_pci_stop_ioeventfd(proxy); |
769 |
virtio_blk_exit(proxy->vdev); |
770 |
virtio_exit_pci(pci_dev); |
771 |
} |
772 |
|
773 |
static int virtio_serial_init_pci(PCIDevice *pci_dev) |
774 |
{ |
775 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
776 |
VirtIODevice *vdev; |
777 |
|
778 |
if (proxy->class_code != PCI_CLASS_COMMUNICATION_OTHER &&
|
779 |
proxy->class_code != PCI_CLASS_DISPLAY_OTHER && /* qemu 0.10 */
|
780 |
proxy->class_code != PCI_CLASS_OTHERS) /* qemu-kvm */
|
781 |
proxy->class_code = PCI_CLASS_COMMUNICATION_OTHER; |
782 |
|
783 |
vdev = virtio_serial_init(&pci_dev->qdev, &proxy->serial); |
784 |
if (!vdev) {
|
785 |
return -1; |
786 |
} |
787 |
vdev->nvectors = proxy->nvectors == DEV_NVECTORS_UNSPECIFIED |
788 |
? proxy->serial.max_virtserial_ports + 1
|
789 |
: proxy->nvectors; |
790 |
virtio_init_pci(proxy, vdev); |
791 |
proxy->nvectors = vdev->nvectors; |
792 |
return 0; |
793 |
} |
794 |
|
795 |
static void virtio_serial_exit_pci(PCIDevice *pci_dev) |
796 |
{ |
797 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
798 |
|
799 |
virtio_pci_stop_ioeventfd(proxy); |
800 |
virtio_serial_exit(proxy->vdev); |
801 |
virtio_exit_pci(pci_dev); |
802 |
} |
803 |
|
804 |
static int virtio_net_init_pci(PCIDevice *pci_dev) |
805 |
{ |
806 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
807 |
VirtIODevice *vdev; |
808 |
|
809 |
vdev = virtio_net_init(&pci_dev->qdev, &proxy->nic, &proxy->net); |
810 |
|
811 |
vdev->nvectors = proxy->nvectors; |
812 |
virtio_init_pci(proxy, vdev); |
813 |
|
814 |
/* make the actual value visible */
|
815 |
proxy->nvectors = vdev->nvectors; |
816 |
return 0; |
817 |
} |
818 |
|
819 |
static void virtio_net_exit_pci(PCIDevice *pci_dev) |
820 |
{ |
821 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
822 |
|
823 |
virtio_pci_stop_ioeventfd(proxy); |
824 |
virtio_net_exit(proxy->vdev); |
825 |
virtio_exit_pci(pci_dev); |
826 |
} |
827 |
|
828 |
static int virtio_balloon_init_pci(PCIDevice *pci_dev) |
829 |
{ |
830 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
831 |
VirtIODevice *vdev; |
832 |
|
833 |
if (proxy->class_code != PCI_CLASS_OTHERS &&
|
834 |
proxy->class_code != PCI_CLASS_MEMORY_RAM) { /* qemu < 1.1 */
|
835 |
proxy->class_code = PCI_CLASS_OTHERS; |
836 |
} |
837 |
|
838 |
vdev = virtio_balloon_init(&pci_dev->qdev); |
839 |
if (!vdev) {
|
840 |
return -1; |
841 |
} |
842 |
virtio_init_pci(proxy, vdev); |
843 |
return 0; |
844 |
} |
845 |
|
846 |
static void virtio_balloon_exit_pci(PCIDevice *pci_dev) |
847 |
{ |
848 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
849 |
|
850 |
virtio_pci_stop_ioeventfd(proxy); |
851 |
virtio_balloon_exit(proxy->vdev); |
852 |
virtio_exit_pci(pci_dev); |
853 |
} |
854 |
|
855 |
static Property virtio_blk_properties[] = {
|
856 |
DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0), |
857 |
DEFINE_BLOCK_PROPERTIES(VirtIOPCIProxy, blk.conf), |
858 |
DEFINE_BLOCK_CHS_PROPERTIES(VirtIOPCIProxy, blk.conf), |
859 |
DEFINE_PROP_STRING("serial", VirtIOPCIProxy, blk.serial),
|
860 |
#ifdef __linux__
|
861 |
DEFINE_PROP_BIT("scsi", VirtIOPCIProxy, blk.scsi, 0, true), |
862 |
#endif
|
863 |
DEFINE_PROP_BIT("config-wce", VirtIOPCIProxy, blk.config_wce, 0, true), |
864 |
DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true), |
865 |
DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2), |
866 |
DEFINE_VIRTIO_BLK_FEATURES(VirtIOPCIProxy, host_features), |
867 |
DEFINE_PROP_END_OF_LIST(), |
868 |
}; |
869 |
|
870 |
static void virtio_blk_class_init(ObjectClass *klass, void *data) |
871 |
{ |
872 |
DeviceClass *dc = DEVICE_CLASS(klass); |
873 |
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); |
874 |
|
875 |
k->init = virtio_blk_init_pci; |
876 |
k->exit = virtio_blk_exit_pci; |
877 |
k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET; |
878 |
k->device_id = PCI_DEVICE_ID_VIRTIO_BLOCK; |
879 |
k->revision = VIRTIO_PCI_ABI_VERSION; |
880 |
k->class_id = PCI_CLASS_STORAGE_SCSI; |
881 |
dc->reset = virtio_pci_reset; |
882 |
dc->props = virtio_blk_properties; |
883 |
} |
884 |
|
885 |
static TypeInfo virtio_blk_info = {
|
886 |
.name = "virtio-blk-pci",
|
887 |
.parent = TYPE_PCI_DEVICE, |
888 |
.instance_size = sizeof(VirtIOPCIProxy),
|
889 |
.class_init = virtio_blk_class_init, |
890 |
}; |
891 |
|
892 |
static Property virtio_net_properties[] = {
|
893 |
DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, false), |
894 |
DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 3), |
895 |
DEFINE_VIRTIO_NET_FEATURES(VirtIOPCIProxy, host_features), |
896 |
DEFINE_NIC_PROPERTIES(VirtIOPCIProxy, nic), |
897 |
DEFINE_PROP_UINT32("x-txtimer", VirtIOPCIProxy, net.txtimer, TX_TIMER_INTERVAL),
|
898 |
DEFINE_PROP_INT32("x-txburst", VirtIOPCIProxy, net.txburst, TX_BURST),
|
899 |
DEFINE_PROP_STRING("tx", VirtIOPCIProxy, net.tx),
|
900 |
DEFINE_PROP_END_OF_LIST(), |
901 |
}; |
902 |
|
903 |
static void virtio_net_class_init(ObjectClass *klass, void *data) |
904 |
{ |
905 |
DeviceClass *dc = DEVICE_CLASS(klass); |
906 |
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); |
907 |
|
908 |
k->init = virtio_net_init_pci; |
909 |
k->exit = virtio_net_exit_pci; |
910 |
k->romfile = "pxe-virtio.rom";
|
911 |
k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET; |
912 |
k->device_id = PCI_DEVICE_ID_VIRTIO_NET; |
913 |
k->revision = VIRTIO_PCI_ABI_VERSION; |
914 |
k->class_id = PCI_CLASS_NETWORK_ETHERNET; |
915 |
dc->reset = virtio_pci_reset; |
916 |
dc->props = virtio_net_properties; |
917 |
} |
918 |
|
919 |
static TypeInfo virtio_net_info = {
|
920 |
.name = "virtio-net-pci",
|
921 |
.parent = TYPE_PCI_DEVICE, |
922 |
.instance_size = sizeof(VirtIOPCIProxy),
|
923 |
.class_init = virtio_net_class_init, |
924 |
}; |
925 |
|
926 |
static Property virtio_serial_properties[] = {
|
927 |
DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true), |
928 |
DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, DEV_NVECTORS_UNSPECIFIED),
|
929 |
DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0), |
930 |
DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features), |
931 |
DEFINE_PROP_UINT32("max_ports", VirtIOPCIProxy, serial.max_virtserial_ports, 31), |
932 |
DEFINE_PROP_END_OF_LIST(), |
933 |
}; |
934 |
|
935 |
static void virtio_serial_class_init(ObjectClass *klass, void *data) |
936 |
{ |
937 |
DeviceClass *dc = DEVICE_CLASS(klass); |
938 |
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); |
939 |
|
940 |
k->init = virtio_serial_init_pci; |
941 |
k->exit = virtio_serial_exit_pci; |
942 |
k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET; |
943 |
k->device_id = PCI_DEVICE_ID_VIRTIO_CONSOLE; |
944 |
k->revision = VIRTIO_PCI_ABI_VERSION; |
945 |
k->class_id = PCI_CLASS_COMMUNICATION_OTHER; |
946 |
dc->reset = virtio_pci_reset; |
947 |
dc->props = virtio_serial_properties; |
948 |
} |
949 |
|
950 |
static TypeInfo virtio_serial_info = {
|
951 |
.name = "virtio-serial-pci",
|
952 |
.parent = TYPE_PCI_DEVICE, |
953 |
.instance_size = sizeof(VirtIOPCIProxy),
|
954 |
.class_init = virtio_serial_class_init, |
955 |
}; |
956 |
|
957 |
static Property virtio_balloon_properties[] = {
|
958 |
DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features), |
959 |
DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0), |
960 |
DEFINE_PROP_END_OF_LIST(), |
961 |
}; |
962 |
|
963 |
static void virtio_balloon_class_init(ObjectClass *klass, void *data) |
964 |
{ |
965 |
DeviceClass *dc = DEVICE_CLASS(klass); |
966 |
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); |
967 |
|
968 |
k->init = virtio_balloon_init_pci; |
969 |
k->exit = virtio_balloon_exit_pci; |
970 |
k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET; |
971 |
k->device_id = PCI_DEVICE_ID_VIRTIO_BALLOON; |
972 |
k->revision = VIRTIO_PCI_ABI_VERSION; |
973 |
k->class_id = PCI_CLASS_OTHERS; |
974 |
dc->reset = virtio_pci_reset; |
975 |
dc->props = virtio_balloon_properties; |
976 |
} |
977 |
|
978 |
static TypeInfo virtio_balloon_info = {
|
979 |
.name = "virtio-balloon-pci",
|
980 |
.parent = TYPE_PCI_DEVICE, |
981 |
.instance_size = sizeof(VirtIOPCIProxy),
|
982 |
.class_init = virtio_balloon_class_init, |
983 |
}; |
984 |
|
985 |
static int virtio_scsi_init_pci(PCIDevice *pci_dev) |
986 |
{ |
987 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
988 |
VirtIODevice *vdev; |
989 |
|
990 |
vdev = virtio_scsi_init(&pci_dev->qdev, &proxy->scsi); |
991 |
if (!vdev) {
|
992 |
return -EINVAL;
|
993 |
} |
994 |
|
995 |
vdev->nvectors = proxy->nvectors == DEV_NVECTORS_UNSPECIFIED |
996 |
? proxy->scsi.num_queues + 3
|
997 |
: proxy->nvectors; |
998 |
virtio_init_pci(proxy, vdev); |
999 |
|
1000 |
/* make the actual value visible */
|
1001 |
proxy->nvectors = vdev->nvectors; |
1002 |
return 0; |
1003 |
} |
1004 |
|
1005 |
static void virtio_scsi_exit_pci(PCIDevice *pci_dev) |
1006 |
{ |
1007 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
1008 |
|
1009 |
virtio_scsi_exit(proxy->vdev); |
1010 |
virtio_exit_pci(pci_dev); |
1011 |
} |
1012 |
|
1013 |
static Property virtio_scsi_properties[] = {
|
1014 |
DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true), |
1015 |
DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, DEV_NVECTORS_UNSPECIFIED),
|
1016 |
DEFINE_VIRTIO_SCSI_PROPERTIES(VirtIOPCIProxy, host_features, scsi), |
1017 |
DEFINE_PROP_END_OF_LIST(), |
1018 |
}; |
1019 |
|
1020 |
static void virtio_scsi_class_init(ObjectClass *klass, void *data) |
1021 |
{ |
1022 |
DeviceClass *dc = DEVICE_CLASS(klass); |
1023 |
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); |
1024 |
|
1025 |
k->init = virtio_scsi_init_pci; |
1026 |
k->exit = virtio_scsi_exit_pci; |
1027 |
k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET; |
1028 |
k->device_id = PCI_DEVICE_ID_VIRTIO_SCSI; |
1029 |
k->revision = 0x00;
|
1030 |
k->class_id = PCI_CLASS_STORAGE_SCSI; |
1031 |
dc->reset = virtio_pci_reset; |
1032 |
dc->props = virtio_scsi_properties; |
1033 |
} |
1034 |
|
1035 |
static TypeInfo virtio_scsi_info = {
|
1036 |
.name = "virtio-scsi-pci",
|
1037 |
.parent = TYPE_PCI_DEVICE, |
1038 |
.instance_size = sizeof(VirtIOPCIProxy),
|
1039 |
.class_init = virtio_scsi_class_init, |
1040 |
}; |
1041 |
|
1042 |
static void virtio_pci_register_types(void) |
1043 |
{ |
1044 |
type_register_static(&virtio_blk_info); |
1045 |
type_register_static(&virtio_net_info); |
1046 |
type_register_static(&virtio_serial_info); |
1047 |
type_register_static(&virtio_balloon_info); |
1048 |
type_register_static(&virtio_scsi_info); |
1049 |
} |
1050 |
|
1051 |
type_init(virtio_pci_register_types) |