Re: [PATCH v2 09/11] vpci/header: Reset the command register when adding devices

[Michal Orzel <michal.orzel@xxxxxxx>]

On 23.09.2021 14:54, Oleksandr Andrushchenko wrote:
> From: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
> 
> Reset the command register when passing through a PCI device:
> it is possible that when passing through a PCI device its memory
> decoding bits in the command register are already set. Thus, a
> guest OS may not write to the command register to update memory
> decoding, so guest mappings (guest's view of the BARs) are
> left not updated.
> 
> Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
> 
> ---
> Since v1:
>  - do not write 0 to the command register, but respect host settings.
> ---
>  xen/drivers/vpci/header.c | 17 +++++++++++++----
>  1 file changed, 13 insertions(+), 4 deletions(-)
> 

Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>