From: Sean Christopherson <seanjc@google.com>
To: Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Michael Roth <michael.roth@amd.com>,
Binbin Wu <binbin.wu@linux.intel.com>
Subject: [PATCH 03/13] KVM: WARN if *any* MMU invalidation sequence doesn't add a range
Date: Thu, 21 Sep 2023 13:33:20 -0700 [thread overview]
Message-ID: <20230921203331.3746712-4-seanjc@google.com> (raw)
In-Reply-To: <20230921203331.3746712-1-seanjc@google.com>
Tweak the assertion in kvm_mmu_invalidate_end() to unconditionally require
a range to be added between start() and end(). Asserting if and only if
kvm->mmu_invalidate_in_progress is non-zero makes the assertion all but
useless as it would fire only when there are multiple invalidations in
flight, which is not common and would also get a false negative if one or
more sequences, but not all, added a range.
Reported-by: Binbin Wu <binbin.wu@linux.intel.com>
Fixes: 145725d1542a ("KVM: Use gfn instead of hva for mmu_notifier_retry")
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
virt/kvm/kvm_main.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 30708e460568..54480655bcce 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -873,11 +873,10 @@ void kvm_mmu_invalidate_end(struct kvm *kvm)
KVM_BUG_ON(kvm->mmu_invalidate_in_progress < 0, kvm);
/*
- * Assert that at least one range must be added between start() and
- * end(). Not adding a range isn't fatal, but it is a KVM bug.
+ * Assert that at least one range was added between start() and end().
+ * Not adding a range isn't fatal, but it is a KVM bug.
*/
- WARN_ON_ONCE(kvm->mmu_invalidate_in_progress &&
- kvm->mmu_invalidate_range_start == INVALID_GPA);
+ WARN_ON_ONCE(kvm->mmu_invalidate_range_start == INVALID_GPA);
}
static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
--
2.42.0.515.g380fc7ccd1-goog
next prev parent reply other threads:[~2023-09-21 22:55 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-21 20:33 [PATCH 00/13] KVM: guest_memfd fixes Sean Christopherson
2023-09-21 20:33 ` [PATCH 01/13] KVM: Assert that mmu_invalidate_in_progress *never* goes negative Sean Christopherson
2023-09-21 20:33 ` [PATCH 02/13] KVM: Actually truncate the inode when doing PUNCH_HOLE for guest_memfd Sean Christopherson
2023-09-21 20:33 ` Sean Christopherson [this message]
2023-09-21 20:33 ` [PATCH 04/13] KVM: WARN if there are danging MMU invalidations at VM destruction Sean Christopherson
2023-09-27 3:16 ` Binbin Wu
2023-09-28 18:11 ` Sean Christopherson
2023-09-21 20:33 ` [PATCH 05/13] KVM: Fix MMU invalidation bookkeeping in guest_memfd Sean Christopherson
2023-09-21 20:33 ` [PATCH 06/13] KVM: Disallow hugepages for incompatible gmem bindings, but let 'em succeed Sean Christopherson
2023-09-22 22:42 ` Michael Roth
2023-09-28 18:31 ` Sean Christopherson
2023-10-02 15:53 ` Michael Roth
2023-10-02 16:49 ` Sean Christopherson
2023-09-21 20:33 ` [PATCH 07/13] KVM: x86/mmu: Track PRIVATE impact on hugepage mappings for all memslots Sean Christopherson
2023-09-27 6:01 ` Binbin Wu
2023-09-27 14:25 ` Sean Christopherson
2023-09-21 20:33 ` [PATCH 08/13] KVM: x86/mmu: Zap shared-only memslots when private attribute changes Sean Christopherson
2023-09-21 20:33 ` [PATCH 09/13] KVM: Always add relevant ranges to invalidation set when changing attributes Sean Christopherson
2023-09-21 20:33 ` [PATCH 10/13] KVM: x86/mmu: Drop repeated add() of to-be-invalidated range Sean Christopherson
2023-09-21 20:33 ` [PATCH 11/13] KVM: selftests: Refactor private mem conversions to prep for punch_hole test Sean Christopherson
2023-09-21 20:33 ` [PATCH 12/13] KVM: selftests: Add a "pure" PUNCH_HOLE on guest_memfd testcase Sean Christopherson
2023-09-21 20:33 ` [PATCH 13/13] KVM: Rename guest_mem.c to guest_memfd.c Sean Christopherson
2023-09-29 2:22 ` [PATCH 00/13] KVM: guest_memfd fixes Sean Christopherson
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