Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH MANUALSEL 5.14 5/5] KVM: MMU: Reset mmu->pkru_mask to avoid stale data | Date | Mon, 25 Oct 2021 16:38:27 -0400 |
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From: Chenyi Qiang <chenyi.qiang@intel.com>
[ Upstream commit a3ca5281bb771d8103ea16f0a6a8a5df9a7fb4f3 ]
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> Signed-off-by: Sasha Levin <sashal@kernel.org> --- 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 c268fb59f779..6719a8041f59 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -4465,10 +4465,10 @@ 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); -- 2.33.0
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