[5/8] drm/i915/gvt: Align the guest gm aperture start offset for live migration

Submitted by Zhao, Yan Y on Feb. 19, 2019, 7:24 a.m.

Details

Message ID 20190219072439.13781-1-yan.y.zhao@intel.com
State New
Headers show
Series "VFIO Device states interface in GVT" ( rev: 1 ) in Intel GVT devel

Not browsing as part of any series.

Commit Message

Zhao, Yan Y Feb. 19, 2019, 7:24 a.m.
From: Yulei Zhang <yulei.zhang@intel.com>

As guest gm aperture region start offset is initialized when vGPU created,
in order to make sure that start offset is remain the same after migration,
align the aperture start offset to 0 for guest.

Signed-off-by: Yulei Zhang <yulei.zhang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
---
 drivers/gpu/drm/i915/gvt/kvmgt.c |  3 +--
 drivers/gpu/drm/i915/gvt/vgpu.c  | 10 ++++++++--
 2 files changed, 9 insertions(+), 4 deletions(-)

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diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index c1072143da1d..223c67e87680 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -1198,8 +1198,7 @@  static long intel_vgpu_ioctl(struct mdev_device *mdev, unsigned int cmd,
 			sparse->header.version = 1;
 			sparse->nr_areas = nr_areas;
 			cap_type_id = VFIO_REGION_INFO_CAP_SPARSE_MMAP;
-			sparse->areas[0].offset =
-					PAGE_ALIGN(vgpu_aperture_offset(vgpu));
+			sparse->areas[0].offset = 0;
 			sparse->areas[0].size = vgpu_aperture_sz(vgpu);
 			break;
 
diff --git a/drivers/gpu/drm/i915/gvt/vgpu.c b/drivers/gpu/drm/i915/gvt/vgpu.c
index c628be05fbfe..fcccda35a456 100644
--- a/drivers/gpu/drm/i915/gvt/vgpu.c
+++ b/drivers/gpu/drm/i915/gvt/vgpu.c
@@ -48,8 +48,7 @@  void populate_pvinfo_page(struct intel_vgpu *vgpu)
 	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);
+	vgpu_vreg_t(vgpu, vgtif_reg(avail_rs.mappable_gmadr.base)) = 0;
 	vgpu_vreg_t(vgpu, vgtif_reg(avail_rs.mappable_gmadr.size)) =
 		vgpu_aperture_sz(vgpu);
 	vgpu_vreg_t(vgpu, vgtif_reg(avail_rs.nonmappable_gmadr.base)) =
@@ -524,6 +523,9 @@  void intel_gvt_reset_vgpu_locked(struct intel_vgpu *vgpu, bool dmlr,
 {
 	struct intel_gvt *gvt = vgpu->gvt;
 	struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
+	u64 maddr = vgpu_vreg_t(vgpu, vgtif_reg(avail_rs.mappable_gmadr.base));
+	u64 unmaddr = vgpu_vreg_t(vgpu,
+				vgtif_reg(avail_rs.nonmappable_gmadr.base));
 	unsigned int resetting_eng = dmlr ? ALL_ENGINES : engine_mask;
 
 	gvt_dbg_core("------------------------------------------\n");
@@ -556,6 +558,10 @@  void intel_gvt_reset_vgpu_locked(struct intel_vgpu *vgpu, bool dmlr,
 
 		intel_vgpu_reset_mmio(vgpu, dmlr);
 		populate_pvinfo_page(vgpu);
+		vgpu_vreg_t(vgpu, vgtif_reg(avail_rs.mappable_gmadr.base)) =
+			maddr;
+		vgpu_vreg_t(vgpu, vgtif_reg(avail_rs.nonmappable_gmadr.base)) =
+			unmaddr;
 		intel_vgpu_reset_display(vgpu);
 
 		if (dmlr) {

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