Re: [PATCH v2 11/11] drm/amdgpu: set TMZ bits in PTEs for secure BO (v4)

["Koenig, Christian" <Christian.Koenig-5C7GfCeVMHo@public.gmane.org>]

Am 25.09.19 um 15:45 schrieb Huang, Ray:
> From: Alex Deucher <alexander.deucher@amd.com>
>
> If a buffer object is secure, i.e. created with
> AMDGPU_GEM_CREATE_ENCRYPTED, then the TMZ bit of
> the PTEs that belong the buffer object should be
> set.
>
> v1: design and draft the skeletion of TMZ bits setting on PTEs (Alex)
> v2: return failure once create secure BO on non-TMZ platform  (Ray)
> v3: amdgpu_bo_encrypted() only checks the BO (Luben)
> v4: move TMZ flag setting into amdgpu_vm_bo_update  (Christian)
>
> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
> Reviewed-by: Huang Rui <ray.huang@amd.com>
> Signed-off-by: Huang Rui <ray.huang@amd.com>
> Signed-off-by: Luben Tuikov <luben.tuikov@amd.com>
> Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c    | 12 +++++++++++-
>   drivers/gpu/drm/amd/amdgpu/amdgpu_object.h | 11 +++++++++++
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c     |  5 +++++
>   3 files changed, 27 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> index 22eab74..5332104 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> @@ -222,7 +222,8 @@ int amdgpu_gem_create_ioctl(struct drm_device *dev, void *data,
>   		      AMDGPU_GEM_CREATE_CPU_GTT_USWC |
>   		      AMDGPU_GEM_CREATE_VRAM_CLEARED |
>   		      AMDGPU_GEM_CREATE_VM_ALWAYS_VALID |
> -		      AMDGPU_GEM_CREATE_EXPLICIT_SYNC))
> +		      AMDGPU_GEM_CREATE_EXPLICIT_SYNC |
> +		      AMDGPU_GEM_CREATE_ENCRYPTED))
>   
>   		return -EINVAL;
>   
> @@ -230,6 +231,11 @@ int amdgpu_gem_create_ioctl(struct drm_device *dev, void *data,
>   	if (args->in.domains & ~AMDGPU_GEM_DOMAIN_MASK)
>   		return -EINVAL;
>   
> +	if (!adev->tmz.enabled && (flags & AMDGPU_GEM_CREATE_ENCRYPTED)) {
> +		DRM_ERROR("Cannot allocate secure buffer while tmz is disabled\n");
> +		return -EINVAL;
> +	}
> +
>   	/* create a gem object to contain this object in */
>   	if (args->in.domains & (AMDGPU_GEM_DOMAIN_GDS |
>   	    AMDGPU_GEM_DOMAIN_GWS | AMDGPU_GEM_DOMAIN_OA)) {
> @@ -251,6 +257,10 @@ int amdgpu_gem_create_ioctl(struct drm_device *dev, void *data,
>   		resv = vm->root.base.bo->tbo.resv;
>   	}
>   
> +	if (flags & AMDGPU_GEM_CREATE_ENCRYPTED) {
> +		/* XXX: pad out alignment to meet TMZ requirements */
> +	}
> +
>   	r = amdgpu_gem_object_create(adev, size, args->in.alignment,
>   				     (u32)(0xffffffff & args->in.domains),
>   				     flags, ttm_bo_type_device, resv, &gobj);
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
> index 5a3c177..75c7392 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
> @@ -224,6 +224,17 @@ static inline bool amdgpu_bo_explicit_sync(struct amdgpu_bo *bo)
>   	return bo->flags & AMDGPU_GEM_CREATE_EXPLICIT_SYNC;
>   }
>   
> +/**
> + * amdgpu_bo_encrypted - test if the BO is encrypted
> + * @bo: pointer to a buffer object
> + *
> + * Return true if the buffer object is encrypted, false otherwise.
> + */
> +static inline bool amdgpu_bo_encrypted(struct amdgpu_bo *bo)
> +{
> +	return bo->flags & AMDGPU_GEM_CREATE_ENCRYPTED;
> +}
> +
>   bool amdgpu_bo_is_amdgpu_bo(struct ttm_buffer_object *bo);
>   void amdgpu_bo_placement_from_domain(struct amdgpu_bo *abo, u32 domain);
>   
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> index b285ab2..8e13b1fd3 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> @@ -1688,6 +1688,11 @@ int amdgpu_vm_bo_update(struct amdgpu_device *adev,
>   
>   	if (bo) {
>   		flags = amdgpu_ttm_tt_pte_flags(adev, bo->tbo.ttm, mem);
> +
> +		if (amdgpu_bo_encrypted(bo)) {
> +			flags |= AMDGPU_PTE_TMZ;
> +		}
> +

You can drop the {} here, apart from that the patch is Reviewed-by: 
Christian König <christian.koenig@amd.com>.

 From the design it would be indeed nicer to have that in 
amdgpu_ttm_tt_pte_flags(), but we would need to make sure that this is 
not called any more from binding a tt.

Regards,
Christian.

>   		bo_adev = amdgpu_ttm_adev(bo->tbo.bdev);
>   	} else {
>   		flags = 0x0;

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