From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from out1-smtp.messagingengine.com ([66.111.4.25]:37133 "EHLO out1-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751505AbdHGUDP (ORCPT ); Mon, 7 Aug 2017 16:03:15 -0400 Subject: FAILED: patch "[PATCH] KVM: arm/arm64: Handle hva aging while destroying the vm" failed to apply to 4.9-stable tree To: Suzuki.Poulose@arm.com, agraf@suse.de, cdall@linaro.org, marc.zyngier@arm.com, suzuki.poulose@arm.com Cc: From: Date: Mon, 07 Aug 2017 13:03:14 -0700 Message-ID: <150213619410066@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: The patch below does not apply to the 4.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >>From 7e5a672289c9754d07e1c3b33649786d3d70f5e4 Mon Sep 17 00:00:00 2001 From: Suzuki K Poulose Date: Wed, 5 Jul 2017 09:57:00 +0100 Subject: [PATCH] KVM: arm/arm64: Handle hva aging while destroying the vm The mmu_notifier_release() callback of KVM triggers cleaning up the stage2 page table on kvm-arm. However there could be other notifier callbacks in parallel with the mmu_notifier_release(), which could cause the call backs ending up in an empty stage2 page table. Make sure we check it for all the notifier callbacks. Cc: stable@vger.kernel.org Fixes: commit 293f29363 ("kvm-arm: Unmap shadow pagetables properly") Reported-by: Alex Graf Reviewed-by: Christoffer Dall Signed-off-by: Suzuki K Poulose Signed-off-by: Marc Zyngier diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c index 0e1fc75f3585..2ea21dac0b44 100644 --- a/virt/kvm/arm/mmu.c +++ b/virt/kvm/arm/mmu.c @@ -1718,12 +1718,16 @@ static int kvm_test_age_hva_handler(struct kvm *kvm, gpa_t gpa, u64 size, void * int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end) { + if (!kvm->arch.pgd) + return 0; trace_kvm_age_hva(start, end); return handle_hva_to_gpa(kvm, start, end, kvm_age_hva_handler, NULL); } int kvm_test_age_hva(struct kvm *kvm, unsigned long hva) { + if (!kvm->arch.pgd) + return 0; trace_kvm_test_age_hva(hva); return handle_hva_to_gpa(kvm, hva, hva, kvm_test_age_hva_handler, NULL); }