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Commit b611581b authored by Changbin Du's avatar Changbin Du Committed by Zhenyu Wang
Browse files

drm/i915/gvt: introuduce intel_vgpu_reset_gtt() to reset gtt 



This patch introduces a new function intel_vgpu_reset_gtt() to reset
the all GTT related status, including GGTT, PPGTT, scratch page. This
function can free all shadowed PPGTT, clear all GGTT entry, and clear
scratch page to all zero. After this, we can ensure no gtt related
information can be leakaged from one VM to anothor one when assign
vgpu instance across different VMs (not simultaneously).

Signed-off-by: default avatarChangbin Du <changbin.du@intel.com>
Signed-off-by: default avatarZhenyu Wang <zhenyuw@linux.intel.com>
parent d22a48bf

drivers/gpu/drm/i915/gvt/gtt.c

+27 −0
Original line number Diff line number Diff line
@@ -2277,3 +2277,30 @@ void intel_vgpu_reset_ggtt(struct intel_vgpu *vgpu) 
	for (offset = 0; offset < num_entries; offset++)

		ops->set_entry(NULL, &e, index + offset, false, 0, vgpu);

}



/**

 * intel_vgpu_reset_gtt - reset the all GTT related status

 * @vgpu: a vGPU

 * @dmlr: true for vGPU Device Model Level Reset, false for GT Reset

 *

 * This function is called from vfio core to reset reset all

 * GTT related status, including GGTT, PPGTT, scratch page.

 *

 */

void intel_vgpu_reset_gtt(struct intel_vgpu *vgpu, bool dmlr)

{

	int i;



	ppgtt_free_all_shadow_page(vgpu);

	if (!dmlr)

		return;



	intel_vgpu_reset_ggtt(vgpu);



	/* clear scratch page for security */

	for (i = GTT_TYPE_PPGTT_PTE_PT; i < GTT_TYPE_MAX; i++) {

		if (vgpu->gtt.scratch_pt[i].page != NULL)

			memset(page_address(vgpu->gtt.scratch_pt[i].page),

				0, PAGE_SIZE);

	}

}

drivers/gpu/drm/i915/gvt/gtt.h

+1 −0
Original line number Diff line number Diff line
@@ -208,6 +208,7 @@ extern void intel_vgpu_clean_gtt(struct intel_vgpu *vgpu); 
void intel_vgpu_reset_ggtt(struct intel_vgpu *vgpu);



extern int intel_gvt_init_gtt(struct intel_gvt *gvt);

extern void intel_vgpu_reset_gtt(struct intel_vgpu *vgpu, bool dmlr);

extern void intel_gvt_clean_gtt(struct intel_gvt *gvt);



extern struct intel_vgpu_mm *intel_gvt_find_ppgtt_mm(struct intel_vgpu *vgpu,