Re: Patch "drm/i915/gvt: Disable access to stolen memory as a guest" has been added to the 4.4-stable tree

[Greg KH <gregkh@linuxfoundation.org>]

Ugh, this broke the build on 4.4, so I'm dropping it from there...

I try to include just a few i915 patches into the stable tree this time,
and all of them break or don't even apply...

Ugh.

greg k-h

On Tue, May 23, 2017 at 08:37:30PM +0200, gregkh@linuxfoundation.org wrote:
> 
> This is a note to let you know that I've just added the patch titled
> 
>     drm/i915/gvt: Disable access to stolen memory as a guest
> 
> to the 4.4-stable tree which can be found at:
>     http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
> 
> The filename of the patch is:
>      drm-i915-gvt-disable-access-to-stolen-memory-as-a-guest.patch
> and it can be found in the queue-4.4 subdirectory.
> 
> If you, or anyone else, feels it should not be added to the stable tree,
> please let <stable@vger.kernel.org> know about it.
> 
> 
> >From 04a68a35ce6d7b54749989f943993020f48fed62 Mon Sep 17 00:00:00 2001
> From: Chris Wilson <chris@chris-wilson.co.uk>
> Date: Wed, 9 Nov 2016 10:39:05 +0000
> Subject: drm/i915/gvt: Disable access to stolen memory as a guest
> 
> From: Chris Wilson <chris@chris-wilson.co.uk>
> 
> commit 04a68a35ce6d7b54749989f943993020f48fed62 upstream.
> 
> Explicitly disable stolen memory when running as a guest in a virtual
> machine, since the memory is not mediated between clients and reserved
> entirely for the host. The actual size should be reported as zero, but
> like every other quirk we want to tell the user what is happening.
> 
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=99028
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
> Link: http://patchwork.freedesktop.org/patch/msgid/20161109103905.17860-1-chris@chris-wilson.co.uk
> Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> 
> ---
>  drivers/gpu/drm/i915/i915_gem_stolen.c |    5 +++++
>  1 file changed, 5 insertions(+)
> 
> --- a/drivers/gpu/drm/i915/i915_gem_stolen.c
> +++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
> @@ -405,6 +405,11 @@ int i915_gem_init_stolen(struct drm_devi
>  
>  	mutex_init(&dev_priv->mm.stolen_lock);
>  
> +	if (intel_vgpu_active(dev_priv)) {
> +		DRM_INFO("iGVT-g active, disabling use of stolen memory\n");
> +		return 0;
> +	}
> +
>  #ifdef CONFIG_INTEL_IOMMU
>  	if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) {
>  		DRM_INFO("DMAR active, disabling use of stolen memory\n");
> 
> 
> Patches currently in stable-queue which might be from chris@chris-wilson.co.uk are
> 
> queue-4.4/drm-i915-gvt-disable-access-to-stolen-memory-as-a-guest.patch