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qemu-kvm/SOURCES/kvm-virtio-pci-decouple-the...

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From 58cd577ff157cfaf7506bba135db58e75c330ff0 Mon Sep 17 00:00:00 2001
From: Cindy Lu <lulu@redhat.com>
Date: Thu, 22 Dec 2022 15:04:44 +0800
Subject: [PATCH 03/31] virtio-pci: decouple the single vector from the
interrupt process
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Cindy Lu <lulu@redhat.com>
RH-MergeRequest: 132: vhost-vdpa: support config interrupt in vhost-vdpa
RH-Bugzilla: 1905805
RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
RH-Acked-by: Eugenio Pérez <eperezma@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Commit: [3/10] 2c79cb678f005fb2f53b2db0f237347634ab3422 (lulu6/qemu-kvm3)
https://bugzilla.redhat.com/show_bug.cgi?id=1905805
To reuse the interrupt process in configure interrupt
Need to decouple the single vector from the interrupt process.
We add new function kvm_virtio_pci_vector_use_one and _release_one.
These functions are used for the single vector, the whole process will
finish in the loop with vq number.
Signed-off-by: Cindy Lu <lulu@redhat.com>
Message-Id: <20221222070451.936503-4-lulu@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry picked from commit ee3b8dc6cc496ba7f4e27aed4493275c706a7942)
Signed-off-by: Cindy Lu <lulu@redhat.com>
---
hw/virtio/virtio-pci.c | 131 +++++++++++++++++++++++------------------
1 file changed, 73 insertions(+), 58 deletions(-)
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index 52c7692fff..ec816ea367 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -699,7 +699,6 @@ static uint32_t virtio_read_config(PCIDevice *pci_dev,
}
static int kvm_virtio_pci_vq_vector_use(VirtIOPCIProxy *proxy,
- unsigned int queue_no,
unsigned int vector)
{
VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
@@ -764,87 +763,103 @@ static int virtio_pci_get_notifier(VirtIOPCIProxy *proxy, int queue_no,
return 0;
}
-static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs)
+static int kvm_virtio_pci_vector_use_one(VirtIOPCIProxy *proxy, int queue_no)
{
+ unsigned int vector;
+ int ret;
+ EventNotifier *n;
PCIDevice *dev = &proxy->pci_dev;
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
- unsigned int vector;
- int ret, queue_no;
- EventNotifier *n;
- for (queue_no = 0; queue_no < nvqs; queue_no++) {
- if (!virtio_queue_get_num(vdev, queue_no)) {
- break;
- }
- ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector);
- if (ret < 0) {
- break;
- }
- if (vector >= msix_nr_vectors_allocated(dev)) {
- continue;
- }
- ret = kvm_virtio_pci_vq_vector_use(proxy, queue_no, vector);
+
+ ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector);
+ if (ret < 0) {
+ return ret;
+ }
+ if (vector >= msix_nr_vectors_allocated(dev)) {
+ return 0;
+ }
+ ret = kvm_virtio_pci_vq_vector_use(proxy, vector);
+ if (ret < 0) {
+ goto undo;
+ }
+ /*
+ * If guest supports masking, set up irqfd now.
+ * Otherwise, delay until unmasked in the frontend.
+ */
+ if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
+ ret = kvm_virtio_pci_irqfd_use(proxy, n, vector);
if (ret < 0) {
+ kvm_virtio_pci_vq_vector_release(proxy, vector);
goto undo;
}
- /* If guest supports masking, set up irqfd now.
- * Otherwise, delay until unmasked in the frontend.
- */
- if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
- ret = kvm_virtio_pci_irqfd_use(proxy, n, vector);
- if (ret < 0) {
- kvm_virtio_pci_vq_vector_release(proxy, vector);
- goto undo;
- }
- }
}
- return 0;
+ return 0;
undo:
- while (--queue_no >= 0) {
- vector = virtio_queue_vector(vdev, queue_no);
- if (vector >= msix_nr_vectors_allocated(dev)) {
- continue;
+
+ vector = virtio_queue_vector(vdev, queue_no);
+ if (vector >= msix_nr_vectors_allocated(dev)) {
+ return ret;
+ }
+ if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
+ ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector);
+ if (ret < 0) {
+ return ret;
}
- if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
- ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector);
- if (ret < 0) {
- break;
- }
- kvm_virtio_pci_irqfd_release(proxy, n, vector);
+ kvm_virtio_pci_irqfd_release(proxy, n, vector);
+ }
+ return ret;
+}
+static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs)
+{
+ int queue_no;
+ int ret = 0;
+ VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
+
+ for (queue_no = 0; queue_no < nvqs; queue_no++) {
+ if (!virtio_queue_get_num(vdev, queue_no)) {
+ return -1;
}
- kvm_virtio_pci_vq_vector_release(proxy, vector);
+ ret = kvm_virtio_pci_vector_use_one(proxy, queue_no);
}
return ret;
}
-static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs)
+
+static void kvm_virtio_pci_vector_release_one(VirtIOPCIProxy *proxy,
+ int queue_no)
{
- PCIDevice *dev = &proxy->pci_dev;
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
unsigned int vector;
- int queue_no;
- VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
EventNotifier *n;
- int ret ;
+ int ret;
+ VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
+ PCIDevice *dev = &proxy->pci_dev;
+
+ ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector);
+ if (ret < 0) {
+ return;
+ }
+ if (vector >= msix_nr_vectors_allocated(dev)) {
+ return;
+ }
+ if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
+ kvm_virtio_pci_irqfd_release(proxy, n, vector);
+ }
+ kvm_virtio_pci_vq_vector_release(proxy, vector);
+}
+
+static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs)
+{
+ int queue_no;
+ VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
+
for (queue_no = 0; queue_no < nvqs; queue_no++) {
if (!virtio_queue_get_num(vdev, queue_no)) {
break;
}
- ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector);
- if (ret < 0) {
- break;
- }
- if (vector >= msix_nr_vectors_allocated(dev)) {
- continue;
- }
- /* If guest supports masking, clean up irqfd now.
- * Otherwise, it was cleaned when masked in the frontend.
- */
- if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
- kvm_virtio_pci_irqfd_release(proxy, n, vector);
- }
- kvm_virtio_pci_vq_vector_release(proxy, vector);
+ kvm_virtio_pci_vector_release_one(proxy, queue_no);
}
}
--
2.31.1
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