[PATCH 1/4] KVM: x86/mmu: Remove redundant is_tdp_mmu_root check

From: David Matlack <dmatlack@google.com>
To: kvm@vger.kernel.org
Cc: Ben Gardon <bgardon@google.com>, Joerg Roedel <joro@8bytes.org>,
	Jim Mattson <jmattson@google.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Sean Christopherson <seanjc@google.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Junaid Shahid <junaids@google.com>,
	David Matlack <dmatlack@google.com>
Subject: [PATCH 1/4] KVM: x86/mmu: Remove redundant is_tdp_mmu_root check
Date: Thu, 17 Jun 2021 23:19:45 +0000	[thread overview]
Message-ID: <20210617231948.2591431-2-dmatlack@google.com> (raw)
In-Reply-To: <20210617231948.2591431-1-dmatlack@google.com>

The check for is_tdp_mmu_root in kvm_tdp_mmu_map is redundant because
kvm_tdp_mmu_map's only caller (direct_page_fault) already checks
is_tdp_mmu_root.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: David Matlack <dmatlack@google.com>
---
 arch/x86/kvm/mmu/tdp_mmu.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index 95eeb5ac6a8a..5888f2ba417c 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -979,8 +979,6 @@ int kvm_tdp_mmu_map(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
 
 	if (WARN_ON(!VALID_PAGE(vcpu->arch.mmu->root_hpa)))
 		return RET_PF_RETRY;
-	if (WARN_ON(!is_tdp_mmu_root(vcpu->kvm, vcpu->arch.mmu->root_hpa)))
-		return RET_PF_RETRY;
 
 	level = kvm_mmu_hugepage_adjust(vcpu, gfn, max_level, &pfn,
 					huge_page_disallowed, &req_level);
-- 
2.32.0.288.g62a8d224e6-goog

