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authorSuzuki K Poulose <Suzuki.Poulose@arm.com>2017-07-05 09:57:00 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-08-12 19:31:23 -0700
commit3f0075cdbdd8ec09cd04034c87d1d1fb9069571e (patch)
tree7ad88390801d0eab154e97b3c33533cd1111ff8a
parent6309eb77d823393ff427312bfd53e2b7f1bdcab2 (diff)
KVM: arm/arm64: Handle hva aging while destroying the vm
commit 7e5a672289c9754d07e1c3b33649786d3d70f5e4 upstream. 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. Fixes: commit 293f29363 ("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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--arch/arm/kvm/mmu.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
index 332ce3b5a34f..710511cadd50 100644
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -1664,12 +1664,16 @@ static int kvm_test_age_hva_handler(struct kvm *kvm, gpa_t gpa, void *data)
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);
}