kvm: x86: mmu: Set SPTE_SPECIAL_MASK within mmu.c

Instead of the caller including the SPTE_SPECIAL_MASK in the masks being
supplied to kvm_mmu_set_mmio_spte_mask() and kvm_mmu_set_mask_ptes(),
those functions now themselves include the SPTE_SPECIAL_MASK.

Note that bit 63 is now reset in the default MMIO mask.

Signed-off-by: Junaid Shahid <junaids@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 64821ca..e3312e2 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -208,7 +208,7 @@ static void mmu_free_roots(struct kvm_vcpu *vcpu);
 
 void kvm_mmu_set_mmio_spte_mask(u64 mmio_mask)
 {
-       shadow_mmio_mask = mmio_mask;
+       shadow_mmio_mask = mmio_mask | SPTE_SPECIAL_MASK;
 }
 EXPORT_SYMBOL_GPL(kvm_mmu_set_mmio_spte_mask);
 
@@ -318,6 +318,9 @@ void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask,
                u64 dirty_mask, u64 nx_mask, u64 x_mask, u64 p_mask,
                u64 acc_track_mask)
 {
+       if (acc_track_mask != 0)
+               acc_track_mask |= SPTE_SPECIAL_MASK;
+
        shadow_user_mask = user_mask;
        shadow_accessed_mask = accessed_mask;
        shadow_dirty_mask = dirty_mask;

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 81c301d..d850d5d 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -5236,10 +5236,8 @@ static void ept_set_mmio_spte_mask(void)
        /*
         * EPT Misconfigurations can be generated if the value of bits 2:0
         * of an EPT paging-structure entry is 110b (write/execute).
-        * Also, special bit (62) is set to quickly identify mmio spte.
         */
-       kvm_mmu_set_mmio_spte_mask(SPTE_SPECIAL_MASK |
-                                  VMX_EPT_MISCONFIG_WX_VALUE);
+       kvm_mmu_set_mmio_spte_mask(VMX_EPT_MISCONFIG_WX_VALUE);
 }
 
 #define VMX_XSS_EXIT_BITMAP 0
@@ -6585,7 +6583,7 @@ void vmx_enable_tdp(void)
                enable_ept_ad_bits ? VMX_EPT_DIRTY_BIT : 0ull,
                0ull, VMX_EPT_EXECUTABLE_MASK,
                cpu_has_vmx_ept_execute_only() ? 0ull : VMX_EPT_READABLE_MASK,
-               enable_ept_ad_bits ? 0ull : SPTE_SPECIAL_MASK | VMX_EPT_RWX_MASK);
+               enable_ept_ad_bits ? 0ull : VMX_EPT_RWX_MASK);
 
        ept_set_mmio_spte_mask();
        kvm_enable_tdp();

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 6e2c71e..4fd4d4f 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5952,9 +5952,6 @@ static void kvm_set_mmio_spte_mask(void)
         /* Mask the reserved physical address bits. */
        mask = rsvd_bits(maxphyaddr, 51);
 
-       /* Bit 62 is always reserved for 32bit host. */
-       mask |= 0x3ull << 62;
-
        /* Set the present bit. */
        mask |= 1ull;