From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoffer Dall Subject: [PULL 10/13] kvm: arm/arm64: Force reading uncached stage2 PGD Date: Thu, 18 May 2017 11:47:19 +0200 Message-ID: <20170518094722.9926-11-cdall@linaro.org> References: <20170518094722.9926-1-cdall@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: Christoffer Dall , kvm@vger.kernel.org, Marc Zyngier , stable@vger.kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org To: Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= Return-path: In-Reply-To: <20170518094722.9926-1-cdall@linaro.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu List-Id: kvm.vger.kernel.org From: Suzuki K Poulose Make sure we don't use a cached value of the KVM stage2 PGD while resetting the PGD. Cc: Marc Zyngier Cc: stable@vger.kernel.org Signed-off-by: Suzuki K Poulose Reviewed-by: Christoffer Dall Signed-off-by: Christoffer Dall --- virt/kvm/arm/mmu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c index 909a1a7..704e35f 100644 --- a/virt/kvm/arm/mmu.c +++ b/virt/kvm/arm/mmu.c @@ -837,7 +837,7 @@ void kvm_free_stage2_pgd(struct kvm *kvm) spin_lock(&kvm->mmu_lock); if (kvm->arch.pgd) { unmap_stage2_range(kvm, 0, KVM_PHYS_SIZE); - pgd = kvm->arch.pgd; + pgd = READ_ONCE(kvm->arch.pgd); kvm->arch.pgd = NULL; } spin_unlock(&kvm->mmu_lock); -- 2.9.0