From: Lai Jiangshan <jiangshan.ljs@antgroup.com>
Date: Thu, 16 Feb 2023 23:53:18 +0000 (+0800)
Subject: KVM: x86/mmu: Allow the roots to be invalid in FNAME(invlpg)
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=ed335278bd1282641748b2b0ca23291c457038ef;p=linux.git

KVM: x86/mmu: Allow the roots to be invalid in FNAME(invlpg)

Don't assume the current root to be valid, just check it and remove
the WARN().

Also move the code to check if the root is valid into FNAME(invlpg)
to simplify the code.

Signed-off-by: Lai Jiangshan <jiangshan.ljs@antgroup.com>
Link: https://lore.kernel.org/r/20230216235321.735214-2-jiangshanlai@gmail.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
---

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index aafa431a35336..32291a84fdc63 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -5787,8 +5787,7 @@ void kvm_mmu_invalidate_addr(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
 		mmu->invlpg(vcpu, addr, mmu->root.hpa);
 
 	for (i = 0; i < KVM_MMU_NUM_PREV_ROOTS; i++) {
-		if ((roots & KVM_MMU_ROOT_PREVIOUS(i)) &&
-		    VALID_PAGE(mmu->prev_roots[i].hpa))
+		if (roots & KVM_MMU_ROOT_PREVIOUS(i))
 			mmu->invlpg(vcpu, addr, mmu->prev_roots[i].hpa);
 	}
 }
diff --git a/arch/x86/kvm/mmu/paging_tmpl.h b/arch/x86/kvm/mmu/paging_tmpl.h
index 4047b8ff83d6e..0b4e3c9a3f05b 100644
--- a/arch/x86/kvm/mmu/paging_tmpl.h
+++ b/arch/x86/kvm/mmu/paging_tmpl.h
@@ -863,10 +863,8 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, u64 addr, hpa_t root_hpa)
 	 */
 	mmu_topup_memory_caches(vcpu, true);
 
-	if (!VALID_PAGE(root_hpa)) {
-		WARN_ON(1);
+	if (!VALID_PAGE(root_hpa))
 		return;
-	}
 
 	write_lock(&vcpu->kvm->mmu_lock);
 	for_each_shadow_entry_using_root(vcpu, root_hpa, addr, iterator) {