Re: [Qemu-devel] [PATCH v2] xen-pvdevice: Introduce a simplistic xen-pvdevice save state

[Anthony PERARD <anthony.perard@citrix.com>]

On Tue, Mar 13, 2018 at 11:14:54PM +0000, Igor Druzhinin wrote:
> This should help to avoid problems with accessing the device after
> migration/resume without PV drivers by migrating its PCI configuration
> space state. Without an explicitly defined state record it resets
> every time a VM migrates which confuses the OS and makes every
> access to xen-pvdevice MMIO region to fail. PV tools enable some
> logic to save and restore PCI configuration state from within the VM
> every time it migrates which basically hides the issue.
> 
> Older systems will acquire the new record when migrated which should
> not change their state for worse.
> 
> Signed-off-by: Igor Druzhinin <igor.druzhinin@citrix.com>
> Reviewed-by: Paul Durrant <paul.durrant@citrix.com>
> ---
> v2: add more concrete info
> ---
>  hw/i386/xen/xen_pvdevice.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)

Acked-by: Anthony PERARD <anthony.perard@citrix.com>

Thanks,

-- 
Anthony PERARD