From: Chenyi Qiang chenyi.qiang@intel.com
commit a3ca5281bb771d8103ea16f0a6a8a5df9a7fb4f3 upstream.
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: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/kvm/mmu/mmu.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -4465,10 +4465,10 @@ static void update_pkru_bitmask(struct k 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);