From: Changbin Du <changbin.du@xxxxxxxxx>
Now GVTg supports shadowing both 2M/64K huge gtt pages. So this is to
remove the restriction on guest side.
To be compatible with old host kernel, we defined a new cap info bit
VGT_CAPS_HUGE_GTT.
Cc: Zhenyu Wang <zhenyuw@xxxxxxxxxxxxxxx>
Signed-off-by: Changbin Du <changbin.du@xxxxxxxxx>
---
drivers/gpu/drm/i915/gvt/vgpu.c | 1 +
drivers/gpu/drm/i915/i915_gem.c | 8 ++------
drivers/gpu/drm/i915/i915_pvinfo.h | 1 +
drivers/gpu/drm/i915/i915_vgpu.h | 6 ++++++
4 files changed, 10 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/gvt/vgpu.c b/drivers/gpu/drm/i915/gvt/vgpu.c
index 2e0a02a..861b398 100644
--- a/drivers/gpu/drm/i915/gvt/vgpu.c
+++ b/drivers/gpu/drm/i915/gvt/vgpu.c
@@ -46,6 +46,7 @@ void populate_pvinfo_page(struct intel_vgpu *vgpu)
vgpu_vreg_t(vgpu, vgtif_reg(vgt_caps)) = VGT_CAPS_FULL_48BIT_PPGTT;
vgpu_vreg_t(vgpu, vgtif_reg(vgt_caps)) |= VGT_CAPS_HWSP_EMULATION;
+ vgpu_vreg_t(vgpu, vgtif_reg(vgt_caps)) |= VGT_CAPS_HUGE_GTT;
vgpu_vreg_t(vgpu, vgtif_reg(avail_rs.mappable_gmadr.base)) =
vgpu_aperture_gmadr_base(vgpu);
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 484354f..e0ddfa1 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -5355,12 +5355,8 @@ 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;
diff --git a/drivers/gpu/drm/i915/i915_pvinfo.h b/drivers/gpu/drm/i915/i915_pvinfo.h
index 195203f..55bde4a 100644
--- a/drivers/gpu/drm/i915/i915_pvinfo.h
+++ b/drivers/gpu/drm/i915/i915_pvinfo.h
@@ -54,6 +54,7 @@ enum vgt_g2v_type {
*/
#define VGT_CAPS_FULL_48BIT_PPGTT BIT(2)
#define VGT_CAPS_HWSP_EMULATION BIT(3)
+#define VGT_CAPS_HUGE_GTT BIT(4)
struct vgt_if {
u64 magic; /* VGT_MAGIC */
diff --git a/drivers/gpu/drm/i915/i915_vgpu.h b/drivers/gpu/drm/i915/i915_vgpu.h
index bb83384..551acc3 100644
--- a/drivers/gpu/drm/i915/i915_vgpu.h
+++ b/drivers/gpu/drm/i915/i915_vgpu.h
@@ -36,6 +36,12 @@ intel_vgpu_has_hwsp_emulation(struct drm_i915_private *dev_priv)
return dev_priv->vgpu.caps & VGT_CAPS_HWSP_EMULATION;
}
+static inline bool
+intel_vgpu_has_huge_gtt(struct drm_i915_private *dev_priv)
+{
+ return dev_priv->vgpu.caps & VGT_CAPS_HUGE_GTT;
+}
+
int intel_vgt_balloon(struct drm_i915_private *dev_priv);
void intel_vgt_deballoon(struct drm_i915_private *dev_priv);
--
2.7.4
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