KVM: x86/mmu: Set mmio_value to '0' if reserved #PF can't be generated

Set the mmio_value to '0' instead of simply clearing the present bit to
squash a benign warning in kvm_mmu_set_mmio_spte_mask() that complains
about the mmio_value overlapping the lower GFN mask on systems with 52
bits of PA space.

Opportunistically clean up the code and comments.

Cc: stable@vger.kernel.org
Fixes: d43e2675e96fc ("KVM: x86: only do L1TF workaround on affected processors")
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200527084909.23492-1-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 86619631ff6ad88b41fc1a855fc951cc6d081874..92d05695419438f5712551f447dd69e99b1051c2 100644 (file)
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -6143,25 +6143,16 @@ static void kvm_set_mmio_spte_mask(void)
        u64 mask;
 
        /*
-        * Set the reserved bits and the present bit of an paging-structure
-        * entry to generate page fault with PFER.RSV = 1.
+        * 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.
         */
-
-       /*
-        * Mask the uppermost physical address bit, which would be reserved as
-        * long as the supported physical address width is less than 52.
-        */
-       mask = 1ull << 51;
-
-       /* Set the present bit. */
-       mask |= 1ull;
-
-       /*
-        * If reserved bit is not supported, clear the present bit to disable
-        * mmio page fault.
-        */
-       if (shadow_phys_bits == 52)
-               mask &= ~1ull;
+       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);
 }