drm/i915: Add new vGPU cap info bit VGT_CAPS_HUGE_GTT
This adds a new vGPU cap info bit VGT_CAPS_HUGE_GTT, which is to detect
whether the host supports shadowing of huge gtt pages. If host does
support it, remove the page sizes restriction for vGPU.
Signed-off-by: Changbin Du <changbin.du@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1525770425-5373-1-git-send-email-changbin.du@intel.com
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index cb680dd..2a51a2b 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -5409,12 +5409,8 @@ int i915_gem_init(struct drm_i915_private *dev_priv)
{
int ret;
- /*
- * We need to fallback to 4K pages since gvt gtt handling doesn't
- * support huge page entries - we will need to check either hypervisor
- * mm can support huge guest page or just do emulation in gvt.
- */
- if (intel_vgpu_active(dev_priv))
+ /* We need to fallback to 4K pages if host doesn't support huge gtt. */
+ if (intel_vgpu_active(dev_priv) && !intel_vgpu_has_huge_gtt(dev_priv))
mkwrite_device_info(dev_priv)->page_sizes =
I915_GTT_PAGE_SIZE_4K;
