Re: [Xen-devel] [PATCH] hw/xen: Set emu_mask for igd_opregion register

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

On Fri, Jul 07, 2017 at 12:07:58PM +0800, Xiong Zhang wrote:
> In igd passthrough environment, guest could only access opregion at the
> first bootup time. Once guest shutdown, later guest couldn't access 
> opregion anymore.
> This is because qemu set emulated guest opregion base address to host
> register. Later guest get a wrong host opregion base address, and couldn't
> access it anymore.
> 
> This patch set emu_mask for igd_opregion register, so guest won't set
> guest opregion base address to host.
> 
> Signed-off-by: Xiong Zhang <xiong.y.zhang@xxxxxxxxx>

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

> ---
>  hw/xen/xen_pt_config_init.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/hw/xen/xen_pt_config_init.c b/hw/xen/xen_pt_config_init.c
> index 6f18366..1f04ec5 100644
> --- a/hw/xen/xen_pt_config_init.c
> +++ b/hw/xen/xen_pt_config_init.c
> @@ -1535,6 +1535,7 @@ static XenPTRegInfo xen_pt_emu_reg_igd_opregion[] = {
>          .offset     = 0x0,
>          .size       = 4,
>          .init_val   = 0,
> +        .emu_mask   = 0xFFFFFFFF,
>          .u.dw.read   = xen_pt_intel_opregion_read,
>          .u.dw.write  = xen_pt_intel_opregion_write,
>      },
> -- 
> 2.7.4
> 

-- 
Anthony PERARD

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel