diff options
| author | David Matlack <dmatlack@google.com> | 2022-01-14 00:30:18 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-01-19 18:06:45 +0100 |
| commit | f082d86ea68559e4bd1ecaffa04981b72281e28f (patch) | |
| tree | 47d1a8868b92411e5a065c83054932bb4ab3bbd7 /arch | |
| parent | KVM: x86/mmu: Fix write-protection of PTs mapped by the TDP MMU (diff) | |
| download | linux-f082d86ea68559e4bd1ecaffa04981b72281e28f.tar.xz linux-f082d86ea68559e4bd1ecaffa04981b72281e28f.zip | |
KVM: x86/mmu: Clear MMU-writable during changed_pte notifier
When handling the changed_pte notifier and the new PTE is read-only,
clear both the Host-writable and MMU-writable bits in the SPTE. This
preserves the invariant that MMU-writable is set if-and-only-if
Host-writable is set.
No functional change intended. Nothing currently relies on the
aforementioned invariant and technically the changed_pte notifier is
dead code.
Signed-off-by: David Matlack <dmatlack@google.com>
Message-Id: <20220113233020.3986005-3-dmatlack@google.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/mmu/spte.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kvm/mmu/spte.c b/arch/x86/kvm/mmu/spte.c index 8a7b03207762..f8677404c93c 100644 --- a/arch/x86/kvm/mmu/spte.c +++ b/arch/x86/kvm/mmu/spte.c @@ -215,6 +215,7 @@ u64 kvm_mmu_changed_pte_notifier_make_spte(u64 old_spte, kvm_pfn_t new_pfn) new_spte &= ~PT_WRITABLE_MASK; new_spte &= ~shadow_host_writable_mask; + new_spte &= ~shadow_mmu_writable_mask; new_spte = mark_spte_for_access_track(new_spte); |