GVTg implemented the read_shared_page functionality based on
hypervisor_read_gpa().
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 | 4 +++-
drivers/gpu/drm/i915/gvt/handlers.c | 5 +++++
drivers/gpu/drm/i915/gvt/vgpu.c | 14 ++++++++++++++
3 files changed, 22 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h
index 31f6cdb..7562f75 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.h
+++ b/drivers/gpu/drm/i915/gvt/gvt.h
@@ -232,6 +232,7 @@ struct intel_vgpu {
struct completion vblank_done;
u32 scan_nonprivbb;
+ u64 shared_page_gpa;
};
/* validating GM healthy status*/
@@ -690,7 +691,8 @@ static inline void intel_gvt_mmio_set_in_ctx(
void intel_gvt_debugfs_remove_vgpu(struct intel_vgpu *vgpu);
int intel_gvt_debugfs_init(struct intel_gvt *gvt);
void intel_gvt_debugfs_clean(struct intel_gvt *gvt);
-
+void intel_gvt_read_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 36171e6..a229770 100644
--- a/drivers/gpu/drm/i915/gvt/handlers.c
+++ b/drivers/gpu/drm/i915/gvt/handlers.c
@@ -1251,6 +1251,11 @@ static int pvinfo_mmio_write(struct intel_vgpu *vgpu, unsigned int offset,
vgpu_vreg(vgpu, offset) = 0;
}
break;
+ case _vgtif_reg(shared_page_gpa.lo):
+ case _vgtif_reg(shared_page_gpa.hi):
+ vgpu->shared_page_gpa = vgpu_vreg64_t(vgpu,
+ vgtif_reg(shared_page_gpa));
+ break;
/* add xhot and yhot to handled list to avoid error log */
case _vgtif_reg(cursor_x_hot):
case _vgtif_reg(cursor_y_hot):
diff --git a/drivers/gpu/drm/i915/gvt/vgpu.c b/drivers/gpu/drm/i915/gvt/vgpu.c
index 1aed197..7101e45 100644
--- a/drivers/gpu/drm/i915/gvt/vgpu.c
+++ b/drivers/gpu/drm/i915/gvt/vgpu.c
@@ -589,3 +589,17 @@ 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
+ */
+void intel_gvt_read_shared_page(struct intel_vgpu *vgpu,
+ unsigned int offset, void *buf, unsigned long len)
+{
+ int ret = 0;
+ unsigned long gpa = vgpu->shared_page_gpa + offset;
+
+ ret = intel_gvt_hypervisor_read_gpa(vgpu, gpa, buf, len);
+ if (ret)
+ gvt_vgpu_err("read shared page (offset %x) failed", offset);
+}
--
1.8.3.1
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