From mboxrd@z Thu Jan  1 00:00:00 1970
From: Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: ResettRe: [Xen-devel] [v5][PATCH 0/5] xen: add
 Intel IGD passthrough support
Date: Wed, 02 Jul 2014 18:27:58 +0200
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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");
>> >