From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 62B6735DD1C; Wed, 22 Jul 2026 15:31:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784734307; cv=none; b=W9dihA8DVAops1AwDXqph7zWE/qB+d0lniNAoUNS/qCACfRHdTu/ccAvEpqwxju2h/BtYlTKaeKSCNZeO9fBbHU217h9AgWLREhGDgkz13g5yzhgtHrWoIjcVDDSkhJMiB3Il+3WuEp73DpUIPFHcAyVkHKmelO2I8FKBziCm34= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784734307; c=relaxed/simple; bh=hEzwBV+PsJMZFHQUBE/OtSpPBhTaKSML/8YZA8FQaPc=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Lvku3DvymarZKEhBDOJa+2nDNaTFOlR41tuZfblbSb77lrmEx/A9ZfBBRfzMkcrQxfEsgnQzSAJJGSpaFwL2ixEBi2uxx5z5M/j+gJVN2dbN3CgaYsgO5Y3MmCdZceMlug98CoVcnrqSFfPNVV8inOt0unPNkzL1I0lF3xrvnT4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=CGzjPkOm; arc=none smtp.client-ip=217.140.110.172 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) header.d=arm.com header.i=@arm.com header.b="CGzjPkOm" 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 854831595; Wed, 22 Jul 2026 08:31:40 -0700 (PDT) Received: from e129823.arm.com (e129823.arm.com [10.2.213.3]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id C595E3F66F; Wed, 22 Jul 2026 08:31:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1784734304; bh=hEzwBV+PsJMZFHQUBE/OtSpPBhTaKSML/8YZA8FQaPc=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=CGzjPkOmqAddjbsG8ADR28xqNpwQCbCIVZQ28QPxQ470spehbu7sZXGkzEiyKQCoD 9tqpzRwhimPeUsyXWspyAEsWw7rw7IWTxF6vIlo+4hPzHZAP1YgBSnkFAgfGE034hI 0u2bUvl46g8HFbNHc47KLB4l2WViWfKtN28DE45Y= From: Yeoreum Yun Date: Wed, 22 Jul 2026 16:30:17 +0100 Subject: [PATCH RFC v2 09/20] loongarch: kvm: remove stack copy address of pXd in pXd_offset() Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260722-dummy_ptxp3-v2-9-d9e4bad31e0a@arm.com> References: <20260722-dummy_ptxp3-v2-0-d9e4bad31e0a@arm.com> In-Reply-To: <20260722-dummy_ptxp3-v2-0-d9e4bad31e0a@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=1993; i=yeoreum.yun@arm.com; h=from:subject:message-id; bh=hEzwBV+PsJMZFHQUBE/OtSpPBhTaKSML/8YZA8FQaPc=; b=owEB7QES/pANAwAKAW3Vw9FaxTEzAcsmYgBqYOITNOofyACG8/QiCZei8Ic1hoiiCQXEac7qC yPXQ1a1hn+JAbMEAAEKAB0WIQQtg+CS3QUzuFh1pJ1t1cPRWsUxMwUCamDiEwAKCRBt1cPRWsUx M0cgDADIz8U7Oh583pQ27I014VPnh9IxMAk2ecbKuCG9fQ0cfoJXO7FKXClIOvwmJMb+1doNs7y pnLXHfrzcROqjlTIY4MzxF97/uzFMjwMVPLeUTg3f9AgeYTtMCTkukqo2k1FOOjd2GMbivyvbmt byvNk66OHNYCC7ny4sUIqRzocrl4arOXlfLn9qTAaE7O/D3E+y2c+HgeDcikVt6fmwNuSLQlnsO duGz8XaSPaZAiytq7Knyo+dn/smQ5WZ1rt/0C7kENuI/dP88VtKsJUFqVFndL6Eq7ftgSbN/qAS pUgbXo6AEn00FnJ1//leWcvPuf3h+Giag5012lyG/teyPR9hv4ksXdc476DwrNshgkhHWkz6wx+ Jhh+VYegE8+aQQSZqdgh9xIb+Geg5itZ0BaOoPAOlK5iNx5ZW6dfJhud63h1RIhIrdbAqEL3eSk n9h+7AYiZRJHvZzaxeJopt3mxwL/gzUQy8f3AzWEO5OSl9XPu4VNsTuHVFzCatpC3pFkY= 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. 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 e104897aa532..837b40bb694f 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