GVTg implemented guest shared_page register operation and read and write
shared_page functionality based on hypervisor read and write functionality.
the shared_page_gpa was passed from guest driver through PVINFO
shared_page_gpa register.
Signed-off-by: Xiaolin Zhang <xiaolin.zhang@xxxxxxxxx>
---
drivers/gpu/drm/i915/gvt/gvt.h | 11 +++++++--
drivers/gpu/drm/i915/gvt/handlers.c | 20 +++++++++++++++++
drivers/gpu/drm/i915/gvt/vgpu.c | 45 +++++++++++++++++++++++++++++++++++++
3 files changed, 74 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h
index 3810b17..ca2f656 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.h
+++ b/drivers/gpu/drm/i915/gvt/gvt.h
@@ -214,6 +214,8 @@ struct intel_vgpu {
u32 scan_nonprivbb;
u32 pv_caps;
+ u64 shared_page_gpa;
+ bool shared_page_enabled;
};
static inline void *intel_vgpu_vdev(struct intel_vgpu *vgpu)
@@ -536,7 +538,7 @@ static inline u64 intel_vgpu_get_bar_gpa(struct intel_vgpu *vgpu, int bar)
static inline bool intel_vgpu_enabled_pv_cap(struct intel_vgpu *vgpu,
enum intel_vgpu_pv_caps cap)
{
- return (vgpu->pv_caps & cap);
+ return vgpu->shared_page_enabled && (vgpu->pv_caps & cap);
}
void intel_vgpu_clean_opregion(struct intel_vgpu *vgpu);
@@ -692,7 +694,12 @@ void intel_gvt_debugfs_add_vgpu(struct intel_vgpu *vgpu);
void intel_gvt_debugfs_remove_vgpu(struct intel_vgpu *vgpu);
void intel_gvt_debugfs_init(struct intel_gvt *gvt);
void intel_gvt_debugfs_clean(struct intel_gvt *gvt);
-
+int intel_gvt_read_shared_page(struct intel_vgpu *vgpu,
+ unsigned int offset, void *buf,
+ unsigned long len);
+int intel_gvt_write_shared_page(struct intel_vgpu *vgpu,
+ unsigned int offset, void *buf,
+ unsigned long len);
#include "trace.h"
#include "mpt.h"
diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c
index 87d562e..67cdae4 100644
--- a/drivers/gpu/drm/i915/gvt/handlers.c
+++ b/drivers/gpu/drm/i915/gvt/handlers.c
@@ -1204,6 +1204,8 @@ static int pvinfo_mmio_read(struct intel_vgpu *vgpu, unsigned int offset,
case 0x78010: /* vgt_caps */
case 0x7881c:
case _vgtif_reg(pv_caps):
+ case _vgtif_reg(shared_page_gpa):
+ case _vgtif_reg(shared_page_gpa) + 4:
break;
default:
invalid_read = true;
@@ -1221,6 +1223,9 @@ static int handle_g2v_notification(struct intel_vgpu *vgpu, int notification)
enum intel_gvt_gtt_type root_entry_type = GTT_TYPE_PPGTT_ROOT_L4_ENTRY;
struct intel_vgpu_mm *mm;
u64 *pdps;
+ unsigned long gpa, gfn;
+ u16 ver_major = PV_MAJOR;
+ u16 ver_minor = PV_MINOR;
pdps = (u64 *)&vgpu_vreg64_t(vgpu, vgtif_reg(pdp[0]));
@@ -1234,6 +1239,19 @@ static int handle_g2v_notification(struct intel_vgpu *vgpu, int notification)
case VGT_G2V_PPGTT_L3_PAGE_TABLE_DESTROY:
case VGT_G2V_PPGTT_L4_PAGE_TABLE_DESTROY:
return intel_vgpu_put_ppgtt_mm(vgpu, pdps);
+ case VGT_G2V_SHARED_PAGE_REGISTER:
+ gpa = vgpu_vreg64_t(vgpu, vgtif_reg(shared_page_gpa));
+ gfn = gpa >> PAGE_SHIFT;
+ if (!intel_gvt_hypervisor_is_valid_gfn(vgpu, gfn)) {
+ vgpu_vreg_t(vgpu, vgtif_reg(pv_caps)) = 0;
+ return 0;
+ }
+ vgpu->shared_page_gpa = gpa;
+ vgpu->shared_page_enabled = true;
+
+ intel_gvt_write_shared_page(vgpu, 0, &ver_major, 2);
+ intel_gvt_write_shared_page(vgpu, 2, &ver_minor, 2);
+ break;
case VGT_G2V_EXECLIST_CONTEXT_CREATE:
case VGT_G2V_EXECLIST_CONTEXT_DESTROY:
case 1: /* Remove this in guest driver. */
@@ -1290,6 +1308,8 @@ static int pvinfo_mmio_write(struct intel_vgpu *vgpu, unsigned int offset,
case _vgtif_reg(pdp[3].hi):
case _vgtif_reg(execlist_context_descriptor_lo):
case _vgtif_reg(execlist_context_descriptor_hi):
+ case _vgtif_reg(shared_page_gpa):
+ case _vgtif_reg(shared_page_gpa) + 4:
break;
case _vgtif_reg(rsv5[0])..._vgtif_reg(rsv5[3]):
invalid_write = true;
diff --git a/drivers/gpu/drm/i915/gvt/vgpu.c b/drivers/gpu/drm/i915/gvt/vgpu.c
index 41d51ec..09bd00a 100644
--- a/drivers/gpu/drm/i915/gvt/vgpu.c
+++ b/drivers/gpu/drm/i915/gvt/vgpu.c
@@ -64,6 +64,8 @@ void populate_pvinfo_page(struct intel_vgpu *vgpu)
vgpu_vreg_t(vgpu, vgtif_reg(cursor_x_hot)) = UINT_MAX;
vgpu_vreg_t(vgpu, vgtif_reg(cursor_y_hot)) = UINT_MAX;
+ vgpu_vreg64_t(vgpu, vgtif_reg(shared_page_gpa)) = 0;
+
gvt_dbg_core("Populate PVINFO PAGE for vGPU %d\n", vgpu->id);
gvt_dbg_core("aperture base [GMADR] 0x%llx size 0x%llx\n",
vgpu_aperture_gmadr_base(vgpu), vgpu_aperture_sz(vgpu));
@@ -613,3 +615,46 @@ void intel_gvt_reset_vgpu(struct intel_vgpu *vgpu)
intel_gvt_reset_vgpu_locked(vgpu, true, 0);
mutex_unlock(&vgpu->vgpu_lock);
}
+
+/**
+ * intel_gvt_read_shared_page - read content from shared page
+ */
+int intel_gvt_read_shared_page(struct intel_vgpu *vgpu,
+ unsigned int offset, void *buf,
+ unsigned long len)
+{
+ int ret = -EINVAL;
+ unsigned long gpa;
+
+ if (offset >= PAGE_SIZE)
+ goto err;
+
+ gpa = vgpu->shared_page_gpa + offset;
+ ret = intel_gvt_hypervisor_read_gpa(vgpu, gpa, buf, len);
+ if (!ret)
+ return ret;
+err:
+ gvt_vgpu_err("read shared page (offset %x) failed", offset);
+ memset(buf, 0, len);
+ return ret;
+}
+
+int intel_gvt_write_shared_page(struct intel_vgpu *vgpu,
+ unsigned int offset, void *buf,
+ unsigned long len)
+{
+ int ret = -EINVAL;
+ unsigned long gpa;
+
+ if (offset >= PAGE_SIZE)
+ goto err;
+
+ gpa = vgpu->shared_page_gpa + offset;
+ ret = intel_gvt_hypervisor_write_gpa(vgpu, gpa, buf, len);
+ if (!ret)
+ return ret;
+err:
+ gvt_vgpu_err("write shared page (offset %x) failed", offset);
+ memset(buf, 0, len);
+ return ret;
+}
--
2.7.4
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