linux-kernel - [PATCH 2/4] KVM: x86/tdp_mmu: Merge the prefetch into the is_access

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Message-ID: <20250207030810.1701-1-yan.y.zhao@intel.com>
Date: Fri,  7 Feb 2025 11:08:10 +0800
From: Yan Zhao <yan.y.zhao@...el.com>
To: pbonzini@...hat.com,
	seanjc@...gle.com
Cc: rick.p.edgecombe@...el.com,
	linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org,
	Yan Zhao <yan.y.zhao@...el.com>
Subject: [PATCH 2/4] KVM: x86/tdp_mmu: Merge the prefetch into the is_access_allowed() check

Merge the prefetch check into the is_access_allowed() check to determine a
spurious fault.

In the TDP MMU, a spurious prefetch fault should also pass the
is_access_allowed() check. Combining these checks to avoid redundancy.

Signed-off-by: Yan Zhao <yan.y.zhao@...el.com>
---
 arch/x86/kvm/mmu/tdp_mmu.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index ab65fd915ef2..5f9e7374220e 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -1137,10 +1137,6 @@ static int tdp_mmu_map_handle_target_level(struct kvm_vcpu *vcpu,
 	if (WARN_ON_ONCE(sp->role.level != fault->goal_level))
 		return RET_PF_RETRY;
 
-	if (fault->prefetch && is_shadow_present_pte(iter->old_spte) &&
-	    is_last_spte(iter->old_spte, iter->level))
-		return RET_PF_SPURIOUS;
-
 	if (is_shadow_present_pte(iter->old_spte) &&
 	    is_access_allowed(fault, iter->old_spte) &&
 	    is_last_spte(iter->old_spte, iter->level))
-- 
2.43.2