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Subject: Re: [virtio-dev] Re: [VIRTIO PCI PATCH v5 1/1] transport-pci: Add freeze_mode to virtio_pci_common_cfg
On Tue, Sep 26, 2023 at 11:37:37AM +0000, Parav Pandit wrote: > Hi Jiqian, > > > From: Chen, Jiqian <Jiqian.Chen@amd.com> > > Sent: Tuesday, September 26, 2023 4:30 PM > > > It is not to trigger resume behavior to device by setting unfreeze in my scenario. > > You may misunderstand my intention. > > In current kernel and qemu code, it will trigger reset device behavior by setting > > device_status to 0 during resuming, and I found some operations of reset is not > > reasonable during resuming, like virtio_gpu_reset, it will destroy render > > resources and then caused the display gone after guest finishing reusming. > > When suspend is done, resume must not be done. > I donât see a need to mix these operations from guest specially when suspend is done. > > Did I miss your response for my suggestion few days ago in [1] for not mixing reset with suspend? > > When new feature bit of suspend is offered, guest will _not_ do reset, hence no need to mix reset with suspend. > > [1] https://lists.oasis-open.org/archives/virtio-comment/202309/msg00260.html I frankly don't understand what you proposed there. reset is a simple operation, it just erases all virtio state from the device. It is very commonly is performed at OS/driver startup. Making it not reset some virtio state is a bad idea since suddenly you kexec a guest that attempts a reset and device is stuck in some weird state. -- MST
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