[PATCH v3 4/9] KVM: x86: MMU: Commets update

From: Robert Hoo <robert.hu@linux.intel.com>
To: pbonzini@redhat.com, seanjc@google.com,
	kirill.shutemov@linux.intel.com, kvm@vger.kernel.org
Cc: Robert Hoo <robert.hu@linux.intel.com>
Subject: [PATCH v3 4/9] KVM: x86: MMU: Commets update
Date: Fri,  9 Dec 2022 12:45:52 +0800	[thread overview]
Message-ID: <20221209044557.1496580-5-robert.hu@linux.intel.com> (raw)
In-Reply-To: <20221209044557.1496580-1-robert.hu@linux.intel.com>

kvm_mmu_ensure_valid_pgd() is stale. Update the comments according to
latest code.

No function changes.

P.S. Sean firstly noticed this in
https://lore.kernel.org/kvm/Yg%2FguAXFLJBmDflh@google.com/.

Signed-off-by: Robert Hoo <robert.hu@linux.intel.com>
---
 arch/x86/kvm/mmu/mmu.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index d433c8923b18..450500086932 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -4452,8 +4452,12 @@ void kvm_mmu_new_pgd(struct kvm_vcpu *vcpu, gpa_t new_pgd)
 	struct kvm_mmu *mmu = vcpu->arch.mmu;
 	union kvm_mmu_page_role new_role = mmu->root_role;
 
+	/*
+	 * If no root is found in cache, current active root.hpa will be (set)
+	 * INVALID_PAGE, a new root will be set up during vcpu_enter_guest()
+	 * --> kvm_mmu_reload().
+	 */
 	if (!fast_pgd_switch(vcpu->kvm, mmu, new_pgd, new_role)) {
-		/* kvm_mmu_ensure_valid_pgd will set up a new root.  */
 		return;
 	}
 
-- 
2.31.1

