[PATCH 05/13] KVM: MMU: reset shadow_mmio_mask

[Xiao Guangrong]

Do not use the last byte (bit 56 ~ bit 63) in shadow_mmio_mask, the late
patch will store vcpu id in the last byte

Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx>
---
 arch/x86/kvm/mmu.c |    1 +
 arch/x86/kvm/vmx.c |    2 +-
 arch/x86/kvm/x86.c |    2 +-
 3 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index ad40647..bb4d292 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -190,6 +190,7 @@ static void mmu_spte_set(u64 *sptep, u64 spte);

 void kvm_mmu_set_mmio_spte_mask(u64 mmio_mask)
 {
+	WARN_ON(mmio_mask & (0xffull << 56));
 	shadow_mmio_mask = mmio_mask;
 }
 EXPORT_SYMBOL_GPL(kvm_mmu_set_mmio_spte_mask);
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 2c22fc7..5ef2b35 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3706,7 +3706,7 @@ static void ept_set_mmio_spte_mask(void)
 	 * Also, magic bits (0xffull << 49) is set to quickly identify mmio
 	 * spte.
 	 */
-	kvm_mmu_set_mmio_spte_mask(0xffull << 49 | 0x6ull);
+	kvm_mmu_set_mmio_spte_mask(0xffull << 46 | 0x6ull);
 }

 /*
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 9970ee6..19ef25e 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4834,7 +4834,7 @@ static void kvm_set_mmio_spte_mask(void)
 	 * Set the reserved bits and the present bit of an paging-structure
 	 * entry to generate page fault with PFER.RSV = 1.
 	 */
-	mask = ((1ull << (62 - maxphyaddr + 1)) - 1) << maxphyaddr;
+	mask = ((1ull << (55 - maxphyaddr + 1)) - 1) << maxphyaddr;
 	mask |= 1ull;

 #ifdef CONFIG_X86_64
-- 
1.7.7.6

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