[PATCH 11/12] KVM: X86: Check root_level only in fast_pgd_switch()

[Lai Jiangshan]

From: Lai Jiangshan <laijs@xxxxxxxxxxxxxxxxx>

If root_level >= 4, shadow_root_level must be >= 4 too.
Checking only root_level can reduce a check.

Signed-off-by: Lai Jiangshan <laijs@xxxxxxxxxxxxxxxxx>
---
 arch/x86/kvm/mmu/mmu.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 9fb9927264d8..1dc8bfd12ecd 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -4136,8 +4136,7 @@ static bool fast_pgd_switch(struct kvm_vcpu *vcpu, gpa_t new_pgd,
 	 * having to deal with PDPTEs. We may add support for 32-bit hosts/VMs
 	 * later if necessary.
 	 */
-	if (mmu->shadow_root_level >= PT64_ROOT_4LEVEL &&
-	    mmu->root_level >= PT64_ROOT_4LEVEL)
+	if (mmu->root_level >= PT64_ROOT_4LEVEL)
 		return cached_root_available(vcpu, new_pgd, new_role);
 
 	return false;
-- 
2.19.1.6.gb485710b