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Fri, 26 Jun 2026 06:42:27 -0700 (PDT) Received: from grower.astra-academy.ru ([185.32.135.49]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5ad69580fcbsm3476839e87.67.2026.06.26.06.42.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Jun 2026 06:42:26 -0700 (PDT) From: Alexander Martyniuk To: stable@vger.kernel.org, Greg Kroah-Hartman Cc: Alexander Martyniuk , Marc Zyngier , Oliver Upton , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, Oliver Upton , Hyunwoo Kim Subject: [PATCH 6.12] KVM: arm64: Take the SRCU lock for page table walks in fault injection and AT emulation Date: Fri, 26 Jun 2026 16:42:07 +0300 Message-ID: <20260626134210.228892-1-alexevgmart@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Hyunwoo Kim commit f2ca45b50d4216c9cc7ffabf50d9ad1932209251 upstream. walk_s1() and kvm_walk_nested_s2() expect to be called while holding kvm->srcu to guard against memslot changes. While this is generally the case, __kvm_at_s12() and __kvm_find_s1_desc_level() call into the respective walkers without taking kvm->srcu. Fix by acquiring kvm->srcu prior to the table walk in both instances. Cc: stable@vger.kernel.org Fixes: 50f77dc87f13 ("KVM: arm64: Populate level on S1PTW SEA injection") Fixes: be04cebf3e78 ("KVM: arm64: nv: Add emulation of AT S12E{0,1}{R,W}") Suggested-by: Oliver Upton Signed-off-by: Hyunwoo Kim Reviewed-by: Oliver Upton Link: https://patch.msgid.link/aiAZfdeyanIvP8SD@v4bel Signed-off-by: Marc Zyngier [Alexander: __kvm_find_s1_desc_level() not present, patching only __kvm_at_s12()] Signed-off-by: Alexander Martyniuk --- arch/arm64/kvm/at.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kvm/at.c b/arch/arm64/kvm/at.c index 39f0e87a340e..8192bc0bbc87 100644 --- a/arch/arm64/kvm/at.c +++ b/arch/arm64/kvm/at.c @@ -1087,7 +1087,8 @@ void __kvm_at_s12(struct kvm_vcpu *vcpu, u32 op, u64 vaddr) /* Do the stage-2 translation */ ipa = (par & GENMASK_ULL(47, 12)) | (vaddr & GENMASK_ULL(11, 0)); out.esr = 0; - ret = kvm_walk_nested_s2(vcpu, ipa, &out); + scoped_guard(srcu, &vcpu->kvm->srcu) + ret = kvm_walk_nested_s2(vcpu, ipa, &out); if (ret < 0) return; -- 2.43.0