From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752455AbdEPJfg (ORCPT ); Tue, 16 May 2017 05:35:36 -0400 Received: from foss.arm.com ([217.140.101.70]:33662 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752067AbdEPJfN (ORCPT ); Tue, 16 May 2017 05:35:13 -0400 From: Suzuki K Poulose To: christoffer.dall@linaro.org Cc: agraf@suse.de, andreyknvl@google.com, marc.zyngier@arm.com, mark.rutland@arm.com, pbonzini@redhat.com, rkrcmar@redhat.com, suzuki.poulose@arm.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, Christoffer Dall Subject: [PATCH v3 1/2] kvm: arm/arm64: Force reading uncached stage2 PGD Date: Tue, 16 May 2017 10:34:54 +0100 Message-Id: <1494927295-29369-2-git-send-email-suzuki.poulose@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1494927295-29369-1-git-send-email-suzuki.poulose@arm.com> References: <1494927295-29369-1-git-send-email-suzuki.poulose@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Make sure we don't use a cached value of the KVM stage2 PGD while resetting the PGD. Cc: Marc Zyngier Cc: Christoffer Dall Signed-off-by: Suzuki K Poulose --- 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); -- 2.7.4