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From: Ben Gardon <bgardon@google.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>,
	Sean Christopherson <sean.j.christopherson@intel.com>,
	Peter Shier <pshier@google.com>,
	"Maciej S . Szmigiero" <maciej.szmigiero@oracle.com>,
	Leo Hou <leohou1402@gmail.com>, Ben Gardon <bgardon@google.com>
Subject: [PATCH 1/3] kvm: x86/mmu: Clarify TDP MMU page list invariants
Date: Tue,  5 Jan 2021 15:31:34 -0800	[thread overview]
Message-ID: <20210105233136.2140335-1-bgardon@google.com> (raw)

The tdp_mmu_roots and tdp_mmu_pages in struct kvm_arch should only contain
pages with tdp_mmu_page set to true. tdp_mmu_pages should not contain any
pages with a non-zero root_count and tdp_mmu_roots should only contain
pages with a positive root_count, unless a thread holds the MMU lock and
is in the process of modifying the list. Various functions expect these
invariants to be maintained, but they are not explictily documented. Add
to the comments on both fields to document the above invariants.

Signed-off-by: Ben Gardon <bgardon@google.com>
---
 arch/x86/include/asm/kvm_host.h | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 39707e72b062..2389735a29f3 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1010,9 +1010,21 @@ struct kvm_arch {
 	 */
 	bool tdp_mmu_enabled;
 
-	/* List of struct tdp_mmu_pages being used as roots */
+	/*
+	 * List of struct tdp_mmu_pages being used as roots.
+	 * All struct kvm_mmu_pages in the list should have
+	 * tdp_mmu_page set.
+	 * All struct kvm_mmu_pages in the list should have a positive
+	 * root_count except when a thread holds the MMU lock and is removing
+	 * an entry from the list.
+	 */
 	struct list_head tdp_mmu_roots;
-	/* List of struct tdp_mmu_pages not being used as roots */
+
+	/*
+	 * List of struct tdp_mmu_pages not being used as roots.
+	 * All struct kvm_mmu_pages in the list should have
+	 * tdp_mmu_page set and a root_count of 0.
+	 */
 	struct list_head tdp_mmu_pages;
 };
 
-- 
2.29.2.729.g45daf8777d-goog


             reply	other threads:[~2021-01-05 23:32 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-05 23:31 Ben Gardon [this message]
2021-01-05 23:31 ` [PATCH 2/3] kvm: x86/mmu: Ensure TDP MMU roots are freed after yield Ben Gardon
2021-01-05 23:38   ` Ben Gardon
2021-01-06  9:26     ` Maciej S. Szmigiero
2021-01-06 17:28       ` Ben Gardon
2021-01-06 17:37         ` Maciej S. Szmigiero
2021-01-06 17:56           ` Ben Gardon
2021-01-06 18:02             ` Maciej S. Szmigiero
2021-01-05 23:31 ` [PATCH 3/3] kvm: x86/mmu: Get/put TDP MMU root refs in iterator Ben Gardon

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