From: Jason Wang <jasowang@redhat.com>
To: Cindy Lu <lulu@redhat.com>, mst@redhat.com, qemu-devel@nongnu.org
Subject: Re: [PATCH v6 2/9] virtio-pci:decouple virtqueue from interrupt setting process
Date: Tue, 27 Apr 2021 14:40:44 +0800 [thread overview]
Message-ID: <78e0debd-a63f-cffc-b252-b138fef4c12d@redhat.com> (raw)
In-Reply-To: <20210427033951.29805-3-lulu@redhat.com>
在 2021/4/27 上午11:39, Cindy Lu 写道:
> Now the code for interrupt/vector are coupling
> with the vq number, this patch will decouple the vritqueue
> numbers from these functions.
So you need to describe why such kind of decoupling is needed,
>
> Signed-off-by: Cindy Lu <lulu@redhat.com>
> ---
> hw/virtio/virtio-pci.c | 51 ++++++++++++++++++++++++------------------
> 1 file changed, 29 insertions(+), 22 deletions(-)
>
> diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
> index 36524a5728..2b7e6cc0d9 100644
> --- a/hw/virtio/virtio-pci.c
> +++ b/hw/virtio/virtio-pci.c
> @@ -691,23 +691,17 @@ static void kvm_virtio_pci_vq_vector_release(VirtIOPCIProxy *proxy,
> }
>
> static int kvm_virtio_pci_irqfd_use(VirtIOPCIProxy *proxy,
> - unsigned int queue_no,
> + EventNotifier *n,
> unsigned int vector)
> {
> VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
> - VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
> - VirtQueue *vq = virtio_get_queue(vdev, queue_no);
> - EventNotifier *n = virtio_queue_get_guest_notifier(vq);
> return kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, n, NULL, irqfd->virq);
> }
>
> static void kvm_virtio_pci_irqfd_release(VirtIOPCIProxy *proxy,
> - unsigned int queue_no,
> + EventNotifier *n ,
> unsigned int vector)
> {
> - VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
> - VirtQueue *vq = virtio_get_queue(vdev, queue_no);
> - EventNotifier *n = virtio_queue_get_guest_notifier(vq);
> VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
> int ret;
>
> @@ -722,7 +716,8 @@ static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs)
> VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
> unsigned int vector;
> int ret, queue_no;
> -
> + VirtQueue *vq;
> + EventNotifier *n;
> for (queue_no = 0; queue_no < nvqs; queue_no++) {
> if (!virtio_queue_get_num(vdev, queue_no)) {
> break;
> @@ -739,7 +734,9 @@ static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs)
> * Otherwise, delay until unmasked in the frontend.
> */
> if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
> - ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector);
> + vq = virtio_get_queue(vdev, queue_no);
> + n = virtio_queue_get_guest_notifier(vq);
> + ret = kvm_virtio_pci_irqfd_use(proxy, n, vector);
> if (ret < 0) {
> kvm_virtio_pci_vq_vector_release(proxy, vector);
> goto undo;
> @@ -755,7 +752,9 @@ undo:
> continue;
> }
> if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
> - kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
> + vq = virtio_get_queue(vdev, queue_no);
> + n = virtio_queue_get_guest_notifier(vq);
> + kvm_virtio_pci_irqfd_release(proxy, n, vector);
> }
> kvm_virtio_pci_vq_vector_release(proxy, vector);
> }
> @@ -769,7 +768,8 @@ static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs)
> unsigned int vector;
> int queue_no;
> VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
> -
> + VirtQueue *vq;
> + EventNotifier *n;
> for (queue_no = 0; queue_no < nvqs; queue_no++) {
> if (!virtio_queue_get_num(vdev, queue_no)) {
> break;
> @@ -782,7 +782,9 @@ static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs)
> * 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, queue_no, vector);
> + vq = virtio_get_queue(vdev, queue_no);
> + n = virtio_queue_get_guest_notifier(vq);
> + kvm_virtio_pci_irqfd_release(proxy, n, vector);
> }
> kvm_virtio_pci_vq_vector_release(proxy, vector);
> }
> @@ -791,12 +793,11 @@ static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs)
> static int virtio_pci_vq_vector_unmask(VirtIOPCIProxy *proxy,
> unsigned int queue_no,
> unsigned int vector,
> - MSIMessage msg)
> + MSIMessage msg,
> + EventNotifier *n)
So you switch to use EventNotifier but keep using queue_no/vector, this
looks kind of duplication.
If we can keep queue_no or virtio_queue_get_guest_notifier working as in
the past, I don't see any reason for this effort.
Thanks
> {
> VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
> VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
> - VirtQueue *vq = virtio_get_queue(vdev, queue_no);
> - EventNotifier *n = virtio_queue_get_guest_notifier(vq);
> VirtIOIRQFD *irqfd;
> int ret = 0;
>
> @@ -823,14 +824,15 @@ static int virtio_pci_vq_vector_unmask(VirtIOPCIProxy *proxy,
> event_notifier_set(n);
> }
> } else {
> - ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector);
> + ret = kvm_virtio_pci_irqfd_use(proxy, n, vector);
> }
> return ret;
> }
>
> static void virtio_pci_vq_vector_mask(VirtIOPCIProxy *proxy,
> unsigned int queue_no,
> - unsigned int vector)
> + unsigned int vector,
> + EventNotifier *n)
> {
> VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
> VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
> @@ -841,7 +843,7 @@ static void virtio_pci_vq_vector_mask(VirtIOPCIProxy *proxy,
> if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
> k->guest_notifier_mask(vdev, queue_no, true);
> } else {
> - kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
> + kvm_virtio_pci_irqfd_release(proxy, n, vector);
> }
> }
>
> @@ -851,6 +853,7 @@ static int virtio_pci_vector_unmask(PCIDevice *dev, unsigned vector,
> VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
> VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
> VirtQueue *vq = virtio_vector_first_queue(vdev, vector);
> + EventNotifier *n;
> int ret, index, unmasked = 0;
>
> while (vq) {
> @@ -859,7 +862,8 @@ static int virtio_pci_vector_unmask(PCIDevice *dev, unsigned vector,
> break;
> }
> if (index < proxy->nvqs_with_notifiers) {
> - ret = virtio_pci_vq_vector_unmask(proxy, index, vector, msg);
> + n = virtio_queue_get_guest_notifier(vq);
> + ret = virtio_pci_vq_vector_unmask(proxy, index, vector, msg, n);
> if (ret < 0) {
> goto undo;
> }
> @@ -875,7 +879,8 @@ undo:
> while (vq && unmasked >= 0) {
> index = virtio_get_queue_index(vq);
> if (index < proxy->nvqs_with_notifiers) {
> - virtio_pci_vq_vector_mask(proxy, index, vector);
> + n = virtio_queue_get_guest_notifier(vq);
> + virtio_pci_vq_vector_mask(proxy, index, vector, n);
> --unmasked;
> }
> vq = virtio_vector_next_queue(vq);
> @@ -888,15 +893,17 @@ static void virtio_pci_vector_mask(PCIDevice *dev, unsigned vector)
> VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
> VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
> VirtQueue *vq = virtio_vector_first_queue(vdev, vector);
> + EventNotifier *n;
> int index;
>
> while (vq) {
> index = virtio_get_queue_index(vq);
> + n = virtio_queue_get_guest_notifier(vq);
> if (!virtio_queue_get_num(vdev, index)) {
> break;
> }
> if (index < proxy->nvqs_with_notifiers) {
> - virtio_pci_vq_vector_mask(proxy, index, vector);
> + virtio_pci_vq_vector_mask(proxy, index, vector, n);
> }
> vq = virtio_vector_next_queue(vq);
> }
next prev parent reply other threads:[~2021-04-27 6:42 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-27 3:39 [PATCH v6 0/9] vhost-vdpa: add support for configure interrupt Cindy Lu
2021-04-27 3:39 ` [PATCH v6 1/9] hw: Add check for queue number Cindy Lu
2021-04-27 5:39 ` Jason Wang
2021-04-29 3:08 ` Cindy Lu
2021-04-27 3:39 ` [PATCH v6 2/9] virtio-pci:decouple virtqueue from interrupt setting process Cindy Lu
2021-04-27 6:40 ` Jason Wang [this message]
2021-04-27 7:17 ` Jason Wang
2021-04-27 3:39 ` [PATCH v6 3/9] vhost: add new call back function for config interrupt Cindy Lu
2021-04-27 3:39 ` [PATCH v6 4/9] vhost-vdpa: add support for config interrupt call back Cindy Lu
2021-04-27 3:39 ` [PATCH v6 5/9] vhost:add support for configure interrupt Cindy Lu
2021-04-27 7:04 ` Jason Wang
2021-04-27 3:39 ` [PATCH v6 6/9] virtio-mmio: add " Cindy Lu
2021-04-27 3:39 ` [PATCH v6 7/9] virtio-pci: " Cindy Lu
2021-04-27 7:12 ` Jason Wang
2021-04-29 3:07 ` Cindy Lu
2021-04-27 3:39 ` [PATCH v6 8/9] virtio: decouple virtqueue from set notifier fd handler Cindy Lu
2021-04-27 7:14 ` Jason Wang
2021-04-27 3:39 ` [PATCH v6 9/9] virtio-net: add peer_deleted check in virtio_net_handle_rx Cindy Lu
2021-04-27 7:15 ` Jason Wang
2021-04-27 3:57 ` [PATCH v6 0/9] vhost-vdpa: add support for configure interrupt no-reply
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