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virtio-pci: add support for configure interrupt 

Add support for configure interrupt, The process is used kvm_irqfd_assign
to set the gsi to kernel. When the configure notifier was signal by
host, qemu will inject a msix interrupt to guest

Signed-off-by: Cindy Lu <lulu@redhat.com>
Message-Id: <20211104164827.21911-11-lulu@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Cindy Lu 2021-11-05 00:48:27 +08:00 committed by Michael S. Tsirkin
parent d48185f1a4
commit d5d24d859c
2 changed files with 83 additions and 13 deletions
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92
hw/virtio/virtio-pci.c
View File

@ -727,7 +727,8 @@ static int virtio_pci_get_notifier(VirtIOPCIProxy *proxy, int queue_no,
VirtQueue *vq;
if (queue_no == VIRTIO_CONFIG_IRQ_IDX) {
return -1;
*n = virtio_config_get_guest_notifier(vdev);
*vector = vdev->config_vector;
} else {
if (!virtio_queue_get_num(vdev, queue_no)) {
return -1;
@ -802,6 +803,10 @@ static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs)
return ret;
}
static int kvm_virtio_pci_vector_config_use(VirtIOPCIProxy *proxy)
{
return kvm_virtio_pci_vector_use_one(proxy, VIRTIO_CONFIG_IRQ_IDX);
}
static void kvm_virtio_pci_vector_release_one(VirtIOPCIProxy *proxy,
int queue_no)
@ -839,6 +844,11 @@ static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs)
}
}
static void kvm_virtio_pci_vector_config_release(VirtIOPCIProxy *proxy)
{
kvm_virtio_pci_vector_release_one(proxy, VIRTIO_CONFIG_IRQ_IDX);
}
static int virtio_pci_one_vector_unmask(VirtIOPCIProxy *proxy,
unsigned int queue_no,
unsigned int vector,
@ -920,9 +930,17 @@ static int virtio_pci_vector_unmask(PCIDevice *dev, unsigned vector,
}
vq = virtio_vector_next_queue(vq);
}
/* unmask config intr */
n = virtio_config_get_guest_notifier(vdev);
ret = virtio_pci_one_vector_unmask(proxy, VIRTIO_CONFIG_IRQ_IDX, vector,
msg, n);
if (ret < 0) {
goto undo_config;
}
return 0;
undo_config:
n = virtio_config_get_guest_notifier(vdev);
virtio_pci_one_vector_mask(proxy, VIRTIO_CONFIG_IRQ_IDX, vector, n);
undo:
vq = virtio_vector_first_queue(vdev, vector);
while (vq && unmasked >= 0) {
@ -956,6 +974,8 @@ static void virtio_pci_vector_mask(PCIDevice *dev, unsigned vector)
}
vq = virtio_vector_next_queue(vq);
}
n = virtio_config_get_guest_notifier(vdev);
virtio_pci_one_vector_mask(proxy, VIRTIO_CONFIG_IRQ_IDX, vector, n);
}
static void virtio_pci_vector_poll(PCIDevice *dev,
@ -987,6 +1007,34 @@ static void virtio_pci_vector_poll(PCIDevice *dev,
msix_set_pending(dev, vector);
}
}
/* poll the config intr */
ret = virtio_pci_get_notifier(proxy, VIRTIO_CONFIG_IRQ_IDX, &notifier,
&vector);
if (ret < 0) {
return;
}
if (vector < vector_start || vector >= vector_end ||
!msix_is_masked(dev, vector)) {
return;
}
if (k->guest_notifier_pending) {
if (k->guest_notifier_pending(vdev, VIRTIO_CONFIG_IRQ_IDX)) {
msix_set_pending(dev, vector);
}
} else if (event_notifier_test_and_clear(notifier)) {
msix_set_pending(dev, vector);
}
}
void virtio_pci_set_guest_notifier_fd_handler(VirtIODevice *vdev, VirtQueue *vq,
int n, bool assign,
bool with_irqfd)
{
if (n == VIRTIO_CONFIG_IRQ_IDX) {
virtio_config_set_guest_notifier_fd_handler(vdev, assign, with_irqfd);
} else {
virtio_queue_set_guest_notifier_fd_handler(vq, assign, with_irqfd);
}
}
static int virtio_pci_set_guest_notifier(DeviceState *d, int n, bool assign,
@ -995,17 +1043,25 @@ static int virtio_pci_set_guest_notifier(DeviceState *d, int n, bool assign,
VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
VirtQueue *vq = virtio_get_queue(vdev, n);
EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
VirtQueue *vq = NULL;
EventNotifier *notifier = NULL;
if (n == VIRTIO_CONFIG_IRQ_IDX) {
notifier = virtio_config_get_guest_notifier(vdev);
} else {
vq = virtio_get_queue(vdev, n);
notifier = virtio_queue_get_guest_notifier(vq);
}
if (assign) {
int r = event_notifier_init(notifier, 0);
if (r < 0) {
return r;
}
virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd);
virtio_pci_set_guest_notifier_fd_handler(vdev, vq, n, true, with_irqfd);
} else {
virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd);
virtio_pci_set_guest_notifier_fd_handler(vdev, vq, n, false,
with_irqfd);
event_notifier_cleanup(notifier);
}
@ -1047,6 +1103,7 @@ static int virtio_pci_set_guest_notifiers(DeviceState *d, int nvqs, bool assign)
msix_unset_vector_notifiers(&proxy->pci_dev);
if (proxy->vector_irqfd) {
kvm_virtio_pci_vector_release(proxy, nvqs);
kvm_virtio_pci_vector_config_release(proxy);
g_free(proxy->vector_irqfd);
proxy->vector_irqfd = NULL;
}
@ -1062,7 +1119,11 @@ static int virtio_pci_set_guest_notifiers(DeviceState *d, int nvqs, bool assign)
goto assign_error;
}
}
r = virtio_pci_set_guest_notifier(d, VIRTIO_CONFIG_IRQ_IDX, assign,
with_irqfd);
if (r < 0) {
goto config_assign_error;
}
/* Must set vector notifier after guest notifier has been assigned */
if ((with_irqfd || k->guest_notifier_mask) && assign) {
if (with_irqfd) {
@ -1071,11 +1132,14 @@ static int virtio_pci_set_guest_notifiers(DeviceState *d, int nvqs, bool assign)
msix_nr_vectors_allocated(&proxy->pci_dev));
r = kvm_virtio_pci_vector_use(proxy, nvqs);
if (r < 0) {
goto assign_error;
goto config_assign_error;
}
}
r = msix_set_vector_notifiers(&proxy->pci_dev,
virtio_pci_vector_unmask,
r = kvm_virtio_pci_vector_config_use(proxy);
if (r < 0) {
goto config_error;
}
r = msix_set_vector_notifiers(&proxy->pci_dev, virtio_pci_vector_unmask,
virtio_pci_vector_mask,
virtio_pci_vector_poll);
if (r < 0) {
@ -1090,7 +1154,11 @@ notifiers_error:
assert(assign);
kvm_virtio_pci_vector_release(proxy, nvqs);
}
config_error:
kvm_virtio_pci_vector_config_release(proxy);
config_assign_error:
virtio_pci_set_guest_notifier(d, VIRTIO_CONFIG_IRQ_IDX, !assign,
with_irqfd);
assign_error:
/* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */
assert(assign);

4
hw/virtio/virtio-pci.h
View File

@ -251,5 +251,7 @@ void virtio_pci_types_register(const VirtioPCIDeviceTypeInfo *t);
* @fixed_queues.
*/
unsigned virtio_pci_optimal_num_queues(unsigned fixed_queues);
void virtio_pci_set_guest_notifier_fd_handler(VirtIODevice *vdev, VirtQueue *vq,
int n, bool assign,
bool with_irqfd);
#endif