linux-kernel - [PATCH 04/22] mm/hmm: support automatic NUMA balancing

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Message-Id: <20190701062020.19239-5-hch@lst.de>
Date:   Mon,  1 Jul 2019 08:20:02 +0200
From:   Christoph Hellwig <hch@....de>
To:     Dan Williams <dan.j.williams@...el.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Ben Skeggs <bskeggs@...hat.com>
Cc:     Ira Weiny <ira.weiny@...el.com>, linux-mm@...ck.org,
        nouveau@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-nvdimm@...ts.01.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, Philip Yang <Philip.Yang@....com>,
        Felix Kuehling <Felix.Kuehling@....com>
Subject: [PATCH 04/22] mm/hmm: support automatic NUMA balancing

From: Philip Yang <Philip.Yang@....com>

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.

Signed-off-by: Philip Yang <Philip.Yang@....com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@....com>
Reviewed-by: Jérôme Glisse <jglisse@...hat.com>
Signed-off-by: Jason Gunthorpe <jgg@...lanox.com>
---
 mm/hmm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/hmm.c b/mm/hmm.c
index 4db5dcf110ba..dce4e70e648a 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -548,7 +548,7 @@ 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] :
-- 
2.20.1