[PATCH v4 6/9] KVM: x86: When KVM judges CR3 valid or not, consider LAM bits

[Robert Hoo <robert.hu@linux.intel.com>]

Before apply to kvm_vcpu_is_illegal_gpa(), clear LAM bits if it's valid.

Signed-off-by: Robert Hoo <robert.hu@linux.intel.com>
Reviewed-by: Jingqi Liu <jingqi.liu@intel.com>
---
 arch/x86/kvm/x86.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 1bdc8c0c80c0..3218f465ae71 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1231,6 +1231,14 @@ static void kvm_invalidate_pcid(struct kvm_vcpu *vcpu, unsigned long pcid)
 	kvm_mmu_free_roots(vcpu->kvm, mmu, roots_to_free);
 }
 
+static bool kvm_is_valid_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
+{
+	if (guest_cpuid_has(vcpu, X86_FEATURE_LAM))
+		cr3 &= ~(X86_CR3_LAM_U48 | X86_CR3_LAM_U57);
+
+	return kvm_vcpu_is_legal_gpa(vcpu, cr3);
+}
+
 int kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
 {
 	bool skip_tlb_flush = false;
@@ -1254,7 +1262,7 @@ int kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
 	 * stuff CR3, e.g. for RSM emulation, and there is no guarantee that
 	 * the current vCPU mode is accurate.
 	 */
-	if (kvm_vcpu_is_illegal_gpa(vcpu, cr3))
+	if (!kvm_is_valid_cr3(vcpu, cr3))
 		return 1;
 
 	if (is_pae_paging(vcpu) && !load_pdptrs(vcpu, cr3))
-- 
2.31.1