motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-02 15:23:53 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

virtio-pci: implement No_Soft_Reset bit

Browse source 
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>
This commit is contained in:
Jiqian Chen 2024-06-06 18:22:05 +08:00 • committed by Michael S. Tsirkin
parent e6c9c9e7f4
commit 5d98e18823
3 changed files with 35 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

5
include/hw/virtio/virtio-pci.h
View file

@ -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)