linux-kernel - [RFC PATCH 2/6] KVM: X86: Walk shadow page starting with shadow_root

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Message-Id: <20211210092508.7185-3-jiangshanlai@gmail.com>
Date:   Fri, 10 Dec 2021 17:25:04 +0800
From:   Lai Jiangshan <jiangshanlai@...il.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>
Cc:     Lai Jiangshan <laijs@...ux.alibaba.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>
Subject: [RFC PATCH 2/6] KVM: X86: Walk shadow page starting with shadow_root_level

From: Lai Jiangshan <laijs@...ux.alibaba.com>

Walking from the root page of the shadow page table should start with
the level of the shadow page table: shadow_root_level.

Also change a small defect in audit_mappings(), it is believed
that the current walking level is more valuable to print.

Signed-off-by: Lai Jiangshan <laijs@...ux.alibaba.com>
---
 arch/x86/kvm/mmu/mmu_audit.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu_audit.c b/arch/x86/kvm/mmu/mmu_audit.c
index 9e7dcf999f08..6bbbf85b3e46 100644
--- a/arch/x86/kvm/mmu/mmu_audit.c
+++ b/arch/x86/kvm/mmu/mmu_audit.c
@@ -63,7 +63,7 @@ static void mmu_spte_walk(struct kvm_vcpu *vcpu, inspect_spte_fn fn)
 		hpa_t root = vcpu->arch.mmu->root_hpa;
 
 		sp = to_shadow_page(root);
-		__mmu_spte_walk(vcpu, sp, fn, vcpu->arch.mmu->root_level);
+		__mmu_spte_walk(vcpu, sp, fn, vcpu->arch.mmu->shadow_root_level);
 		return;
 	}
 
@@ -119,8 +119,7 @@ static void audit_mappings(struct kvm_vcpu *vcpu, u64 *sptep, int level)
 	hpa =  pfn << PAGE_SHIFT;
 	if ((*sptep & PT64_BASE_ADDR_MASK) != hpa)
 		audit_printk(vcpu->kvm, "levels %d pfn %llx hpa %llx "
-			     "ent %llxn", vcpu->arch.mmu->root_level, pfn,
-			     hpa, *sptep);
+			     "ent %llxn", level, pfn, hpa, *sptep);
 }
 
 static void inspect_spte_has_rmap(struct kvm *kvm, u64 *sptep)
-- 
2.19.1.6.gb485710b