Commit 7e5a6722 authored Jul 05, 2017 by Suzuki K Poulose Committed by Marc Zyngier Jul 25, 2017

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 293f2936 ("kvm-arm: Unmap shadow pagetables properly")
Reported-by: Alex Graf <agraf@suse.de>
Reviewed-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

parent d9f89b4e

virt/kvm/arm/mmu.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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);
		}

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