On Thu, Mar 09, 2017 at 06:25:37PM +0800, Zhenyu Wang wrote:
> From commit a6508ded2a66 ("drm/i915: Use page coloring to provide the guard
> page at the end of the GTT"), we no longer explicitly subtract guard page
> at end for GGTT address space init, so shouldn't subtract that for vGPU
> balloon too, as that will leave that end page to be available for
> vGPU. Change balloon to cover full range too.
>
> This fixes to use recent drm-intel tip kernel for guest OS. Found by GVT-g
> cmd parser that guest kernel uses end page as scratch then try to run
> MI_STORE_REG_MEM onto it.
>
> Cc: Terrence Xu <terrence.xu@xxxxxxxxx>
> Signed-off-by: Zhenyu Wang <zhenyuw@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_vgpu.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_vgpu.c b/drivers/gpu/drm/i915/i915_vgpu.c
> index 14014068dfcf..e0a3d61bd232 100644
> --- a/drivers/gpu/drm/i915/i915_vgpu.c
> +++ b/drivers/gpu/drm/i915/i915_vgpu.c
> @@ -222,9 +222,9 @@ int intel_vgt_balloon(struct drm_i915_private *dev_priv)
> * No need to partition out the last physical page,
> * because it is reserved to the guard page.
> */
And update the comment.
> - if (unmappable_end < ggtt_end - PAGE_SIZE) {
> + if (unmappable_end < ggtt_end) {
> ret = vgt_balloon_space(ggtt, &bl_info.space[3],
> - unmappable_end, ggtt_end - PAGE_SIZE);
> + unmappable_end, ggtt_end);
> if (ret)
> goto err;
> }
--
Chris Wilson, Intel Open Source Technology Centre
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