cfn/computing-offload
Code Issues Proposed changes
79c4324644
computing-offload/generic_vdpa/qemu/virtio-pci-add-support-for-configure-interrupt.patch
jiangdongxu 79c4324644 add generic_vdpa basecode 
Change-Id: I2d302dda68298877c65c99147f5bf22186a59aac
2024-09-19 17:19:46 +08:00

219 lines
8.2 KiB
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From ce91ab22c29c56e4e18ee2e861b65657f7bb3e90 Mon Sep 17 00:00:00 2001
From: fangyi <eric.fangyi@huawei.com>
Date: Thu, 16 Nov 2023 09:54:54 +0800
Subject: [PATCH] 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>
Signed-off-by: fangyi <eric.fangyi@huawei.com>
---
hw/virtio/virtio-pci.c | 92 ++++++++++++++++++++++++++++++++++++------
hw/virtio/virtio-pci.h | 4 +-
2 files changed, 83 insertions(+), 13 deletions(-)
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index 75be770971..90237f523e 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -812,7 +812,8 @@ 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;
@@ -887,6 +888,10 @@ 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)
@@ -924,6 +929,11 @@ 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,
@@ -1005,9 +1015,17 @@ 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) {
@@ -1041,6 +1059,8 @@ 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,
@@ -1072,6 +1092,34 @@ 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,
@@ -1080,17 +1128,25 @@ 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);
}
@@ -1132,6 +1188,7 @@ 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;
}
@@ -1147,7 +1204,11 @@ 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) {
@@ -1156,11 +1217,14 @@ 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) {
@@ -1175,7 +1239,11 @@ 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);
diff --git a/hw/virtio/virtio-pci.h b/hw/virtio/virtio-pci.h
index d95b1a13a5..6d8e071d8d 100644
--- a/hw/virtio/virtio-pci.h
+++ b/hw/virtio/virtio-pci.h
@@ -256,5 +256,7 @@ 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
--
2.27.0
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