Messages in this thread Patch in this message | | | From | Chenyi Qiang <> | Subject | [PATCH] KVM: MMU: Reset mmu->pkru_mask to avoid stale data | Date | Thu, 21 Oct 2021 15:10:22 +0800 |
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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: commit 2d344105f57c ("KVM, pkeys: introduce pkru_mask to cache conditions") Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com> --- arch/x86/kvm/mmu/mmu.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index c6ddb042b281..fe73d7ee5492 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -4556,10 +4556,10 @@ 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); -- 2.17.1
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