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Peter Anvin" , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jonas Bonn , Stefan Kristiansson , Stafford Horne Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-openrisc@vger.kernel.org, Yeoreum Yun X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2052; i=yeoreum.yun@arm.com; h=from:subject:message-id; bh=tenWdx/UAPDDmgqvhn1jTW0rtV2ElcnA6e+1jtwaJs8=; b=owEB7QES/pANAwAKAW3Vw9FaxTEzAcsmYgBqsQ1PJaEMk0o9SRiHZSjHIfm+GrA188fN+4hRU 6wJUgjEtAaJAbMEAAEKAB0WIQQtg+CS3QUzuFh1pJ1t1cPRWsUxMwUCarENTwAKCRBt1cPRWsUx M8LxC/9j9lKenvxhbWb1SDdCXY3s7kZnCDH1casxpL2CIqsMn1jRkSXlvvWc0FK7/ooO4WCtNPY isddhbQdba3tQ14ARwFYleVeWNNmiT05JGvjASoPg50ySoGJaDe19OE4hZWOghnmxjkdc86g7jL gcCOPOwe9mQY4LNYG8oZF9///bcv3szPoREYgWxSzP1vxiY0prT9Dyfrv3zTgfStuBUY4ntnptW G6zFnDbNPzkifb/jVOuDI1ksUJyOcnJzCCWQh8wAul/S21IO6AC6udNQZCpR4UHngkTh0e7kUgq arNAcFyIjLTCw2utF3PQlxLJylHPboWGN6Qby0dJF/WPvfwiMZ5ZqM7rzEP8W0iKnUglDk7bkpP V87UdgAwIoTi1oSvrjliTDJV5yEBgdqYWHvSXN54WMH8yzs8AO3xWzAryfmg1jwsGVfcCNvBtRA 5hUpniFYmqdNtZll1Rh6ljx/ikMnaZyFYSHYscH16HGIFR1qU5Wck0IPfXF0jYchNE1jQ= X-Developer-Key: i=yeoreum.yun@arm.com; a=openpgp; fpr=2D83E092DD0533B85875A49D6DD5C3D15AC53133 X-Stat-Signature: ei1winoa193x8muyc4t1ykicca5yfchx X-Rspam-User: X-Rspamd-Queue-Id: 6C62640006 X-Rspamd-Server: rspam03 X-HE-Tag: 1789988257-469439 X-HE-Meta: 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 PeoYxMYs rrT7iatELz0IkJWDhLqtaTTABfbmnXcf7Y1T3olO7NXEvcJK+BBivOLez2S7IkrV9T1kyulw5xd6lZIetazPapjgHpQkHf6qfrDTLzWJnTqc2IUqOJFMESTFFzELaexuWy0aMnMtxfiqHknPMzWvFx0P7hQaHAPxUiCAE4p5IYMmTYiy8DONdnchsBP7nRsjP89hxuEzncdmrULXVr43RdwJC5JRRJjAnGLMg8VhzNrZusAIInVWVcBEJ7DqcGTodeTigF829VLZop3WCX12Nd7JylVxYRXn3tZDxNwKQhCJtrKNaYhB7g97qUClch9sdhtfbay6gg9lMN+Y= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The behaviour of pXdp_get() will change with generic compile-time folded page tables. To prepare for that, rework host_pfn_mapping_level() to avoid use of a stack copy of a pXd and pass it as argument to pXd_offset() so that the folded entries value is ignored. Replace direct uses of stack-based pXd values with pXd_offset_lockless(). And there should be no functional change. Reviewed-by: David Hildenbrand (Arm) Signed-off-by: Yeoreum Yun --- arch/loongarch/kvm/mmu.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-) diff --git a/arch/loongarch/kvm/mmu.c b/arch/loongarch/kvm/mmu.c index e104897aa5328..837b40bb694f4 100644 --- a/arch/loongarch/kvm/mmu.c +++ b/arch/loongarch/kvm/mmu.c @@ -669,10 +669,10 @@ static int host_pfn_mapping_level(struct kvm *kvm, gfn_t gfn, int level = 0; unsigned long hva; unsigned long flags; - pgd_t pgd; - p4d_t p4d; - pud_t pud; - pmd_t pmd; + pgd_t *pgdp, pgd; + p4d_t *p4dp, p4d; + pud_t *pudp, pud; + pmd_t *pmdp, pmd; /* * Note, using the already-retrieved memslot and __gfn_to_hva_memslot() @@ -698,19 +698,23 @@ static int host_pfn_mapping_level(struct kvm *kvm, gfn_t gfn, * value) and then p*d_offset() walks into the target huge page instead * of the old page table (sees the new value). */ - pgd = pgdp_get(pgd_offset(kvm->mm, hva)); + pgdp = pgd_offset(kvm->mm, hva); + pgd = pgdp_get(pgdp); if (pgd_none(pgd)) goto out; - p4d = p4dp_get(p4d_offset(&pgd, hva)); + p4dp = p4d_offset_lockless(pgdp, pgd, hva); + p4d = p4dp_get(p4dp); if (p4d_none(p4d) || !p4d_present(p4d)) goto out; - pud = pudp_get(pud_offset(&p4d, hva)); + pudp = pud_offset_lockless(p4dp, p4d, hva); + pud = pudp_get(pudp); if (pud_none(pud) || !pud_present(pud)) goto out; - pmd = pmdp_get(pmd_offset(&pud, hva)); + pmdp = pmd_offset_lockless(pudp, pud, hva); + pmd = pmdp_get(pmdp); if (pmd_none(pmd) || !pmd_present(pmd)) goto out; -- 2.43.0