linux-kernel - [PATCH v2 4/4] KVM: x86/mmu: fix comment about mmu_unsync_pages

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Message-Id: <20231125083400.1399197-5-pbonzini@redhat.com>
Date:   Sat, 25 Nov 2023 03:34:00 -0500
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     seanjc@...gle.com, mlevitsk@...hat.com
Subject: [PATCH v2 4/4] KVM: x86/mmu: fix comment about mmu_unsync_pages_lock

Fix the comment about what can and cannot happen when mmu_unsync_pages_lock
is not help.  The comment correctly mentions "clearing sp->unsync", but then
it talks about unsync going from 0 to 1.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/mmu/mmu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 1cb81573a60b..a71b8813febe 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -2840,9 +2840,9 @@ int mmu_try_to_unsync_pages(struct kvm *kvm, const struct kvm_memory_slot *slot,
 			/*
 			 * Recheck after taking the spinlock, a different vCPU
 			 * may have since marked the page unsync.  A false
-			 * positive on the unprotected check above is not
+			 * negative on the unprotected check above is not
 			 * possible as clearing sp->unsync _must_ hold mmu_lock
-			 * for write, i.e. unsync cannot transition from 0->1
+			 * for write, i.e. unsync cannot transition from 1->0
 			 * while this CPU holds mmu_lock for read (or write).
 			 */
 			if (READ_ONCE(sp->unsync))
-- 
2.39.1