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kvm: arm/arm64: Force reading uncached stage2 PGD

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commit 2952a6070e07ebdd5896f1f5b861acad677caded upstream.

Make sure we don't use a cached value of the KVM stage2 PGD while
resetting the PGD.

Cc: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Suzuki K Poulose 2017-05-16 10:34:54 +01:00 • committed by Greg Kroah-Hartman
parent 57ff696f54
commit 628212c89f
1 changed files with 1 additions and 1 deletions
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2
arch/arm/kvm/mmu.c
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@ -833,7 +833,7 @@ 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);
hwpgd = kvm_get_hwpgd(kvm);
kvm->arch.pgd = NULL;
}