From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=217.140.110.172 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793618554; b=O8QOedE0iMA1SsJRvAhSItn3PA2TlsWFzOtzHemRAl6CyIHgVTnkXupMGkh/Kkzn1lT7 gdvZKk4K3NFZebrbv1f9jLR2wwUSw2o38kzxqqKsUY85LDjydyXC6pQkYlxycMBzcB7mn 5aeHMJgYnhhfXXcSTlvRGKGMFiQ/ZSD2JZqLvdCfiZckLxGgt8+4DHbBaglasWL0eRAK5 UnuRFIXIKJj/Ly7tdcRAY9xMPpIe71FVwODi6/gik4ijOgRdkbGqTJZloGV47Ld3CKaPY DBE467B/V2CVPcohTbSBEzbDAhILQGfKXQLOOtKMgpgKMwDVS14xIRng3KWgHg8iq8w== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793618554; h=DMARC-Filter:Received:Received:DKIM-Signature:From:Date:Subject: MIME-Version:Content-Type:Content-Transfer-Encoding:Message-Id: References:In-Reply-To:To:Cc:X-Mailer:X-Developer-Signature: X-Developer-Key; bh=HLNvHrR0Fpj6ftr47GYXDwUrEMv6CUTbezLhLSAnnFs=; b=r0sDtbAdzjh2aBSY524l9XBWzrgXSVKQTqDzHDLkNVr8vzOXbqHmPtWhrx9BRfo+NnFt hCfnXWGXi49i5+IUOh49YUqrWSetOT0r56zf0LcBW6pdzvtKTIL4n/KXRAqyL4s6aZNF/ PVDjWHJsnb7i5FFoICxr48xJ3+XDhvVWC4q9vqlKCKlS0SNeN93rMzgDVbzFp0nxNmEW7 lPeduFxXiTgfXXXr/Am6ha8x71V8GZggPGnkalGwXMi2K8rTXU8uRf+9NIolSuCCrsjtf fpiUT0mGuXGCnJjpIYiHjkc3TwidoY3cOkpKt/OtVRNcuDdqa+YDMl54q+Xx54TKFwA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass header.d=arm.com header.i=@arm.com header.a=rsa-sha256 header.s=foss header.b=NGzAi2YU; arc=none smtp.remote-ip=217.140.110.172 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 8B4CF60A380D; Mon, 2 Nov 2026 11:22:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 8B4CF60A380D Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=arm.com header.i=@arm.com header.a=rsa-sha256 header.s=foss header.b=NGzAi2YU Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 092802A68; Mon, 2 Nov 2026 03:22:30 -0800 (PST) Received: from e129823.arm.com (e129823.arm.com [10.2.213.3]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 00DBA3F632; Mon, 2 Nov 2026 03:22:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1793618553; bh=QYmfwdLe215hLGuFdCj5safJ8gxdq3zlW1ht1LiurFo=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=NGzAi2YUuhqkVXhnAdJL2xqwg1sWWuNnmUOJc6WYMvcZsOaHYodWzzAQDylogAHGF sAlnvTGEoaWaY/k2K8WvP84MmxrLyH3UL6M62DxDMZKwAFnAf1wnmUlSt9sVt9I0mu Q2N9zAaDmNiAxl2O123nlIpmLVp78QCa6wl12pEo= From: Yeoreum Yun Date: Mon, 02 Nov 2026 11:21:22 +0000 Subject: [PATCH RESEND v2 09/21] loongarch: kvm: remove stack copy address of pXd in pXd_offset() X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261102-dummy_ptxp3-v2-9-78840b2ec73c@arm.com> References: <20261102-dummy_ptxp3-v2-0-78840b2ec73c@arm.com> In-Reply-To: <20261102-dummy_ptxp3-v2-0-78840b2ec73c@arm.com> To: Russell King , Huacai Chen , WANG Xuerui , Thomas Bogendoerfer , Catalin Marinas , Will Deacon , Arnd Bergmann , Andrew Morton , Kairui Song , Qi Zheng , Shakeel Butt , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Johannes Weiner , David Hildenbrand , Michal Hocko , Lorenzo Stoakes , Tianrui Zhao , Bibo Mao , Anup Patel , Atish Patra , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. 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=QYmfwdLe215hLGuFdCj5safJ8gxdq3zlW1ht1LiurFo=; b=owEB7QES/pANAwAKAW3Vw9FaxTEzAcsmYgBq6HIzqxNaFzhvjoxpWT/tFvwVycvQLXxje++RP KuCMEyxm3SJAbMEAAEKAB0WIQQtg+CS3QUzuFh1pJ1t1cPRWsUxMwUCauhyMwAKCRBt1cPRWsUx MwUIDACW8rDfN4PXoaycRrecOSJ5P2sV/Skn8cOJ9F/ArQxVMCOkJHu/jozzrN/5ZWRoyfVV6qI hDxzX47bfW4GqsHO5E1uaj6xJ9OnTVdhFE4l/Z+UE2LIN2XI1Bin4FtP4AUH6tjSrIcQmyrNuOY XpIxrn+T3hDCqyoo51zdCIbgMvWpEbTre5IJV1a6Mqp1c9cAMKvBQOnCovyb5XsRcbIXCK8GBUL 2aP3pPNFUvXRH3QTlxhUPhWul1wCFo4bQXDbwm3jT1xU3N3aXNrX3vH+jBPPeM7le+WT+nLhcpw JPwBBCr35AoUF9s0nSKAF8CEAIqpWUI4RFhNipztYZBEkGzzdx93KCdMunXOhPaOscVKbSwRRW1 mKOv00ylFBZKNhssbxn6+dLKmk1it/0MZ4POP9C9XuNAa2KUbJdt9fNpzJ29FeV5L8d5guM5A+f InDzrZ916vWbbdE91pO/GFYPPVhW3wBYZ+/6ONFGYaYRLD9E0AY3bJ6iH3q3dxINcdz1c= X-Developer-Key: i=yeoreum.yun@arm.com; a=openpgp; fpr=2D83E092DD0533B85875A49D6DD5C3D15AC53133 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 64fddd9f0ada1..ab0a06b73e8d3 100644 --- a/arch/loongarch/kvm/mmu.c +++ b/arch/loongarch/kvm/mmu.c @@ -679,10 +679,10 @@ 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() @@ -708,19 +708,23 @@ 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