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Re: [Qemu-devel] [PATCH v2] xen-pvdevice: Introduce a simplistic xen-pvd
From: |
Anthony PERARD |
Subject: |
Re: [Qemu-devel] [PATCH v2] xen-pvdevice: Introduce a simplistic xen-pvdevice save state |
Date: |
Tue, 27 Mar 2018 10:42:05 +0100 |
User-agent: |
Mutt/1.9.4 (2018-02-28) |
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 <address@hidden>
> Reviewed-by: Paul Durrant <address@hidden>
> ---
> v2: add more concrete info
> ---
> hw/i386/xen/xen_pvdevice.c | 11 +++++++++++
> 1 file changed, 11 insertions(+)
Acked-by: Anthony PERARD <address@hidden>
Thanks,
--
Anthony PERARD