Re: [PATCHi v2] drm/i915: Enhanced disable access to stolen memory as a guest

[Zhenyu Wang <zhenyuw@linux.intel.com>]

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On 2017.03.24 18:23:44 +0800, Xiong Zhang wrote:
> commit "04a68a3 drm/i915/gvt: Disable access to stolen memory as a guest"
> isn't enough in GVT-d which will pass through IGD to guest and don't run
> vgt code. While intel_vgpu_active() is true only when vgt code run on
> host and guest in GVT-g.
> 
> v2:GVT-g may run in non qemu (Zhenyu)
> 
> Signed-off-by: Xiong Zhang <xiong.y.zhang@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_drv.c        | 1 +
>  drivers/gpu/drm/i915/i915_drv.h        | 1 +
>  drivers/gpu/drm/i915/i915_gem_stolen.c | 4 ++--
>  3 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index 03d9e45..8b807a9 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -223,6 +223,7 @@ static void intel_detect_pch(struct drm_i915_private *dev_priv)
>  					    PCI_SUBVENDOR_ID_REDHAT_QUMRANET &&
>  				    pch->subsystem_device ==
>  					    PCI_SUBDEVICE_ID_QEMU)) {
> +				dev_priv->run_on_qemu = true;
>  				dev_priv->pch_type =
>  					intel_virt_detect_pch(dev_priv);
>  			} else
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index a5947a4..ad95c87 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -2145,6 +2145,7 @@ struct drm_i915_private {
>  	struct intel_uncore uncore;
>  
>  	struct i915_virtual_gpu vgpu;
> +	bool run_on_qemu;
>  
>  	struct intel_gvt *gvt;
>  
> diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
> index f3abdc2..6a011b0 100644
> --- a/drivers/gpu/drm/i915/i915_gem_stolen.c
> +++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
> @@ -409,8 +409,8 @@ int i915_gem_init_stolen(struct drm_i915_private *dev_priv)
>  
>  	mutex_init(&dev_priv->mm.stolen_lock);
>  
> -	if (intel_vgpu_active(dev_priv)) {
> -		DRM_INFO("iGVT-g active, disabling use of stolen memory\n");
> +	if (dev_priv->run_on_qemu || intel_vgpu_active(dev_priv)) {
> +		DRM_INFO("Running in guest, disabling use of stolen memory\n");
>  		return 0;
>  	}
>  
> -- 

Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>

-- 
Open Source Technology Center, Intel ltd.

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