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From 0954dece4cd9593544905479c8ec25f68c4c485e Mon Sep 17 00:00:00 2001
From: Felix Kuehling <Felix.Kuehling@amd.com>
Date: Mon, 8 Jul 2019 20:01:22 -0400
Subject: [PATCH 3320/4256] drm/amdgpu: Mark KFD VRAM allocations for wipe on
release
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Memory used by KFD applications can contain sensitive information that
should not be leaked to other processes. The current approach to prevent
leaks is to clear VRAM at allocation time. This is not effective because
memory can be reused in other ways without being cleared. Synchronously
clearing memory on the allocation path also carries a significant
performance penalty.
Stop clearing memory at allocation time. Instead mark the memory for
wipe on release.
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index d144d04d7b0e..580f52eda694 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -1149,7 +1149,7 @@ int amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(
*/
if (flags & ALLOC_MEM_FLAGS_VRAM) {
domain = alloc_domain = AMDGPU_GEM_DOMAIN_VRAM;
- alloc_flags = AMDGPU_GEM_CREATE_VRAM_CLEARED;
+ alloc_flags = AMDGPU_GEM_CREATE_VRAM_WIPE_ON_RELEASE;
alloc_flags |= (flags & ALLOC_MEM_FLAGS_PUBLIC) ?
AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED :
AMDGPU_GEM_CREATE_NO_CPU_ACCESS;
--
2.17.1
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