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From 56af71944396f0376a44b8ea94c896cba63efc7d Mon Sep 17 00:00:00 2001
From: Philip Yang <Philip.Yang@amd.com>
Date: Tue, 28 May 2019 15:28:58 -0400
Subject: [PATCH 2049/2940] mm/hmm.c: support automatic NUMA balancing
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
While the page is migrating by NUMA balancing, HMM failed to detect this
condition and still return the old page. Application will use the new
page migrated, but driver pass the old page physical address to GPU, this
crash the application later.
Use pte_protnone(pte) to return this condition and then hmm_vma_do_fault
will allocate new page.
Link: http://lkml.kernel.org/r/20190510195258.9930-2-Felix.Kuehling@amd.com
Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Jérôme Glisse <jglisse@redhat.com>
Cc: Alex Deucher <alex.deucher@amd.com>
Cc: Dave Airlie <airlied@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/hmm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/hmm.c b/mm/hmm.c
index c5cb352f5276..4609bde6997e 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -512,7 +512,7 @@ static int hmm_vma_handle_pmd(struct mm_walk *walk,
static inline uint64_t pte_to_hmm_pfn_flags(struct hmm_range *range, pte_t pte)
{
- if (pte_none(pte) || !pte_present(pte))
+ if (pte_none(pte) || !pte_present(pte) || pte_protnone(pte))
return 0;
return pte_write(pte) ? range->flags[HMM_PFN_VALID] |
range->flags[HMM_PFN_WRITE] :
--
2.17.1
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