diff options
| author | Sean Christopherson <seanjc@google.com> | 2022-08-03 22:49:56 +0000 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-08-10 15:08:24 -0400 |
| commit | c3e0c8c2e8b17bae30d5978bc2decdd4098f0f99 (patch) | |
| tree | 460b3db1631b5a7a65194c3902d896dcea11d327 /arch/x86/kvm/mmu/spte.h | |
| parent | 982bae43f11c37b51d2f1961bb25ef7cac3746fa (diff) | |
KVM: x86/mmu: Fully re-evaluate MMIO caching when SPTE masks change
Fully re-evaluate whether or not MMIO caching can be enabled when SPTE
masks change; simply clearing enable_mmio_caching when a configuration
isn't compatible with caching fails to handle the scenario where the
masks are updated, e.g. by VMX for EPT or by SVM to account for the C-bit
location, and toggle compatibility from false=>true.
Snapshot the original module param so that re-evaluating MMIO caching
preserves userspace's desire to allow caching. Use a snapshot approach
so that enable_mmio_caching still reflects KVM's actual behavior.
Fixes: 8b9e74bfbf8c ("KVM: x86/mmu: Use enable_mmio_caching to track if MMIO caching is enabled")
Reported-by: Michael Roth <michael.roth@amd.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: stable@vger.kernel.org
Tested-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Message-Id: <20220803224957.1285926-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/mmu/spte.h')
| -rw-r--r-- | arch/x86/kvm/mmu/spte.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kvm/mmu/spte.h b/arch/x86/kvm/mmu/spte.h index cabe3fbb4f39..26b144ffd146 100644 --- a/arch/x86/kvm/mmu/spte.h +++ b/arch/x86/kvm/mmu/spte.h @@ -450,6 +450,7 @@ static inline u64 restore_acc_track_spte(u64 spte) u64 kvm_mmu_changed_pte_notifier_make_spte(u64 old_spte, kvm_pfn_t new_pfn); +void __init kvm_mmu_spte_module_init(void); void kvm_mmu_reset_all_pte_masks(void); #endif |