linux-kernel - [PATCH v2 2/5] KVM: fix direction of dependency on MMU notifiers

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Date: Mon,  8 Jan 2024 07:47:37 -0500
From: Paolo Bonzini <pbonzini@...hat.com>
To: linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org
Cc: ajones@...tanamicro.com
Subject: [PATCH v2 2/5] KVM: fix direction of dependency on MMU notifiers

KVM_GENERIC_MEMORY_ATTRIBUTES requires the generic MMU notifier code, because
it uses kvm_mmu_invalidate_begin/end.  However, it would not work with a bespoke
implementation of MMU notifiers that does not use KVM_GENERIC_MMU_NOTIFIER,
because most likely it would not synchronize correctly on invalidation.  So
the right thing to do is to note the problematic configuration if the
architecture does not select itself KVM_GENERIC_MMU_NOTIFIER; not to
enable it blindly.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 virt/kvm/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig
index ace72be98fb2..184dab4ee871 100644
--- a/virt/kvm/Kconfig
+++ b/virt/kvm/Kconfig
@@ -97,7 +97,7 @@ config KVM_GENERIC_MMU_NOTIFIER
        bool

 config KVM_GENERIC_MEMORY_ATTRIBUTES
-       select KVM_GENERIC_MMU_NOTIFIER
+       depends on KVM_GENERIC_MMU_NOTIFIER
        bool

 config KVM_PRIVATE_MEM
-- 
2.39.1