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KVM: MMU: Reset mmu->pkru_mask to avoid stale data

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When updating mmu->pkru_mask, the value can only be added but it isn't
reset in advance. This will make mmu->pkru_mask keep the stale data.
Fix this issue.

Fixes: 2d344105f57c ("KVM, pkeys: introduce pkru_mask to cache conditions")
Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
Message-Id: <20211021071022.1140-1-chenyi.qiang@intel.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Chenyi Qiang 2021-10-21 15:10:22 +08:00 committed by Paolo Bonzini
parent 3a25dfa67f
commit a3ca5281bb
1 changed files with 3 additions and 3 deletions
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6
arch/x86/kvm/mmu/mmu.c
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@ -4596,10 +4596,10 @@ static void update_pkru_bitmask(struct kvm_mmu *mmu)
unsigned bit;
bool wp;
if (!is_cr4_pke(mmu)) {
mmu->pkru_mask = 0;
mmu->pkru_mask = 0;
if (!is_cr4_pke(mmu))
return;
}
wp = is_cr0_wp(mmu);