[PATCH] drm/amdgpu: add determine passthrough under arm64

[PATCH] drm/amdgpu: add determine passthrough under arm64

[Victor Zhao]

add determine for passthrough mode under arm64 by reading
CurrentEL register

Signed-off-by: Victor Zhao <Victor.Zhao@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
index c5edd84c1c12..40803aab136f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
@@ -296,6 +296,8 @@ static inline bool is_virtual_machine(void)
 {
 #ifdef CONFIG_X86
 	return boot_cpu_has(X86_FEATURE_HYPERVISOR);
+#elif CONFIG_ARM64
+	return !is_kernel_in_hyp_mode();
 #else
 	return false;
 #endif
-- 
2.25.1

Re: [PATCH] drm/amdgpu: add determine passthrough under arm64

[Alex Deucher]

Acked-by: Alex Deucher <alexander.deucher@amd.com>

On Mon, Jan 24, 2022 at 1:45 AM Victor Zhao <Victor.Zhao@amd.com> wrote:
>
> add determine for passthrough mode under arm64 by reading
> CurrentEL register
>
> Signed-off-by: Victor Zhao <Victor.Zhao@amd.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
> index c5edd84c1c12..40803aab136f 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
> @@ -296,6 +296,8 @@ static inline bool is_virtual_machine(void)
>  {
>  #ifdef CONFIG_X86
>         return boot_cpu_has(X86_FEATURE_HYPERVISOR);
> +#elif CONFIG_ARM64
> +       return !is_kernel_in_hyp_mode();
>  #else
>         return false;
>  #endif
> --
> 2.25.1
>