diff options
| author | Sean Christopherson <seanjc@google.com> | 2021-02-25 23:47:41 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-03-15 11:43:47 +0300 |
| commit | d6b87f256591cf6be78825db6a09a5218666e539 (patch) | |
| tree | 8dd2ee1d59dcb95bf03c7ab97ad2a459d5e60b7d /arch/x86/kvm/mmu/spte.c | |
| parent | ec761cfd353f3b37072cda095d245c155c7cdb0f (diff) | |
| download | linux-d6b87f256591cf6be78825db6a09a5218666e539.tar.xz | |
KVM: x86/mmu: Co-locate code for setting various SPTE masks
Squish all the code for (re)setting the various SPTE masks into one
location. With the split code, it's not at all clear that the masks are
set once during module initialization. This will allow a future patch to
clean up initialization of the masks without shuffling code all over
tarnation.
No functional change intended.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210225204749.1512652-17-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/mmu/spte.c')
| -rw-r--r-- | arch/x86/kvm/mmu/spte.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/x86/kvm/mmu/spte.c b/arch/x86/kvm/mmu/spte.c index cf0e20b34cd3..b15d6006dbee 100644 --- a/arch/x86/kvm/mmu/spte.c +++ b/arch/x86/kvm/mmu/spte.c @@ -310,6 +310,7 @@ EXPORT_SYMBOL_GPL(kvm_mmu_set_mask_ptes); void kvm_mmu_reset_all_pte_masks(void) { u8 low_phys_bits; + u64 mask; shadow_user_mask = 0; shadow_accessed_mask = 0; @@ -344,4 +345,22 @@ void kvm_mmu_reset_all_pte_masks(void) shadow_nonpresent_or_rsvd_lower_gfn_mask = GENMASK_ULL(low_phys_bits - 1, PAGE_SHIFT); + + /* + * Set a reserved PA bit in MMIO SPTEs to generate page faults with + * PFEC.RSVD=1 on MMIO accesses. 64-bit PTEs (PAE, x86-64, and EPT + * paging) support a maximum of 52 bits of PA, i.e. if the CPU supports + * 52-bit physical addresses then there are no reserved PA bits in the + * PTEs and so the reserved PA approach must be disabled. + */ + if (shadow_phys_bits < 52) + mask = BIT_ULL(51) | PT_PRESENT_MASK; + else + mask = 0; + + kvm_mmu_set_mmio_spte_mask(mask, mask, ACC_WRITE_MASK | ACC_USER_MASK); + + kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK, + PT_DIRTY_MASK, PT64_NX_MASK, 0, + PT_PRESENT_MASK, 0, sme_me_mask); } |