Re: [Qemu-devel] ResettRe: [Xen-devel] [v5][PATCH 0/5] xen: add Intel IGD passthrough support

[Paolo Bonzini]

Il 02/07/2014 18:23, Konrad Rzeszutek Wilk ha scritto:
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index 651e65e..03f2829 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -433,6 +433,8 @@ void intel_detect_pch(struct drm_device *dev)
>                         unsigned short id = pch->device & 
> INTEL_PCH_DEVICE_ID_MASK;
>                         dev_priv->pch_id = id;
>
> +                       if (pch->subsystem_vendor == PCI_VENDOR_ID_XEN)
> +                               id = pch->device & INTEL_PCH_DEVICE_ID_MASK;

Actually you could look at *dev*'s subsystem IDs and skip the pch lookup 
completely.

Paolo

>                         if (id == INTEL_PCH_IBX_DEVICE_ID_TYPE) {
>                                 dev_priv->pch_type = PCH_IBX;
>                                 DRM_DEBUG_KMS("Found Ibex Peak PCH\n");
> > >