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| author | Jiqian Chen <Jiqian.Chen@amd.com> | 2024-06-06 18:22:05 +0800 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2024-07-01 17:16:05 -0400 |
| commit | 5d98e18823af6d5230fca8098a7ee966aaedeb29 (patch) | |
| tree | a658408abfc2f3110a63ac39e1ef70479c71d7db /include | |
| parent | e6c9c9e7f46a9ecaf1d90a68595915d65cd9d72d (diff) | |
| download | qemu-5d98e18823af6d5230fca8098a7ee966aaedeb29.zip qemu-5d98e18823af6d5230fca8098a7ee966aaedeb29.tar.gz qemu-5d98e18823af6d5230fca8098a7ee966aaedeb29.tar.bz2 | |
virtio-pci: implement No_Soft_Reset bit
In current code, when guest does S3, virtio-gpu are reset due to the
bit No_Soft_Reset is not set. After resetting, the display resources
of virtio-gpu are destroyed, then the display can't come back and only
show blank after resuming.
Implement No_Soft_Reset bit of PCI_PM_CTRL register, then guest can check
this bit, if this bit is set, the devices resetting will not be done, and
then the display can work after resuming.
No_Soft_Reset bit is implemented for all virtio devices, and was tested
only on virtio-gpu device. Set it false by default for safety.
Signed-off-by: Jiqian Chen <Jiqian.Chen@amd.com>
Message-Id: <20240606102205.114671-3-Jiqian.Chen@amd.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/hw/virtio/virtio-pci.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/hw/virtio/virtio-pci.h b/include/hw/virtio/virtio-pci.h index 59d8801..9e67ba3 100644 --- a/include/hw/virtio/virtio-pci.h +++ b/include/hw/virtio/virtio-pci.h @@ -43,6 +43,7 @@ enum { VIRTIO_PCI_FLAG_INIT_FLR_BIT, VIRTIO_PCI_FLAG_AER_BIT, VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED_BIT, + VIRTIO_PCI_FLAG_PM_NO_SOFT_RESET_BIT, }; /* Need to activate work-arounds for buggy guests at vmstate load. */ @@ -79,6 +80,10 @@ enum { /* Init Power Management */ #define VIRTIO_PCI_FLAG_INIT_PM (1 << VIRTIO_PCI_FLAG_INIT_PM_BIT) +/* Init The No_Soft_Reset bit of Power Management */ +#define VIRTIO_PCI_FLAG_PM_NO_SOFT_RESET \ + (1 << VIRTIO_PCI_FLAG_PM_NO_SOFT_RESET_BIT) + /* Init Function Level Reset capability */ #define VIRTIO_PCI_FLAG_INIT_FLR (1 << VIRTIO_PCI_FLAG_INIT_FLR_BIT) |