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[RFC 2/8] virtio-pci: Lock ioeventfd state with VIRTIO_F_NOTIFICATION_DATA

Jonah Palmer posted 8 patches 8 months, 4 weeks ago
Maintainers: Raphael Norwitz <raphael@enfabrica.net>, "Michael S. Tsirkin" <mst@redhat.com>, Kevin Wolf <kwolf@redhat.com>, Hanna Reitz <hreitz@redhat.com>, Jason Wang <jasowang@redhat.com>, Richard Henderson <richard.henderson@linaro.org>, David Hildenbrand <david@redhat.com>, Ilya Leoshkevich <iii@linux.ibm.com>, Halil Pasic <pasic@linux.ibm.com>, Christian Borntraeger <borntraeger@linux.ibm.com>, Eric Farman <farman@linux.ibm.com>, Thomas Huth <thuth@redhat.com>, Cornelia Huck <cohuck@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, Fam Zheng <fam@euphon.net>, Stefan Hajnoczi <stefanha@redhat.com>
There is a newer version of this series
[RFC 2/8] virtio-pci: Lock ioeventfd state with VIRTIO_F_NOTIFICATION_DATA
Posted by Jonah Palmer 8 months, 4 weeks ago 
Prevent ioeventfd from being enabled/disabled when a virtio-pci
device has negotiated the VIRTIO_F_NOTIFICATION_DATA transport
feature.

Due to ioeventfd not being able to carry the extra data associated with
this feature, the ioeventfd should be left in a disabled state for
emulated virtio-pci devices using this feature.

Signed-off-by: Jonah Palmer <jonah.palmer@oracle.com>
---
 hw/virtio/virtio-pci.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index c7c577b177..fd9717a0f5 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -420,13 +420,15 @@ static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
         }
         break;
     case VIRTIO_PCI_STATUS:
-        if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) {
+        if (!(val & VIRTIO_CONFIG_S_DRIVER_OK) &&
+            !virtio_vdev_has_feature(vdev, VIRTIO_F_NOTIFICATION_DATA)) {
             virtio_pci_stop_ioeventfd(proxy);
         }
 
         virtio_set_status(vdev, val & 0xFF);
 
-        if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
+        if ((val & VIRTIO_CONFIG_S_DRIVER_OK) &&
+            !virtio_vdev_has_feature(vdev, VIRTIO_F_NOTIFICATION_DATA)) {
             virtio_pci_start_ioeventfd(proxy);
         }
 
-- 
2.39.3
Re: [RFC 2/8] virtio-pci: Lock ioeventfd state with VIRTIO_F_NOTIFICATION_DATA
Posted by Eugenio Perez Martin 8 months, 4 weeks ago 
On Fri, Mar 1, 2024 at 2:44 PM Jonah Palmer <jonah.palmer@oracle.com> wrote:
>
> Prevent ioeventfd from being enabled/disabled when a virtio-pci
> device has negotiated the VIRTIO_F_NOTIFICATION_DATA transport
> feature.
>
> Due to ioeventfd not being able to carry the extra data associated with
> this feature, the ioeventfd should be left in a disabled state for
> emulated virtio-pci devices using this feature.
>
> Signed-off-by: Jonah Palmer <jonah.palmer@oracle.com>

Reviewed-by: Eugenio Pérez <eperezma@redhat.com>

Thanks!

> ---
>  hw/virtio/virtio-pci.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
> index c7c577b177..fd9717a0f5 100644
> --- a/hw/virtio/virtio-pci.c
> +++ b/hw/virtio/virtio-pci.c
> @@ -420,13 +420,15 @@ static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
>          }
>          break;
>      case VIRTIO_PCI_STATUS:
> -        if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) {
> +        if (!(val & VIRTIO_CONFIG_S_DRIVER_OK) &&
> +            !virtio_vdev_has_feature(vdev, VIRTIO_F_NOTIFICATION_DATA)) {
>              virtio_pci_stop_ioeventfd(proxy);
>          }
>
>          virtio_set_status(vdev, val & 0xFF);
>
> -        if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
> +        if ((val & VIRTIO_CONFIG_S_DRIVER_OK) &&
> +            !virtio_vdev_has_feature(vdev, VIRTIO_F_NOTIFICATION_DATA)) {
>              virtio_pci_start_ioeventfd(proxy);
>          }
>
> --
> 2.39.3
>

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