Messages in this thread Patch in this message | | | Date | Sun, 18 Jun 2023 00:08:54 +0000 | Subject | [PATCH 4/6] KVM: Documentation: Add the missing tdp_mmu_root_count into kvm_mmu_page | From | Mingwei Zhang <> |
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Add tdp_mmu_root_count into kvm_mmu_page description. tdp_mmu_root_count is an atomic counter used only in TDP MMU. Its usage and meaning is slightly different with root_counter in shadow MMU. Update the doc.
Signed-off-by: Mingwei Zhang <mizhang@google.com> --- Documentation/virt/kvm/x86/mmu.rst | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/Documentation/virt/kvm/x86/mmu.rst b/Documentation/virt/kvm/x86/mmu.rst index 36bfe0fe02bb..3dce2426ad6d 100644 --- a/Documentation/virt/kvm/x86/mmu.rst +++ b/Documentation/virt/kvm/x86/mmu.rst @@ -230,6 +230,12 @@ Shadow pages contain the following information: A counter keeping track of how many hardware registers (guest cr3 or pdptrs) are now pointing at the page. While this counter is nonzero, the page cannot be destroyed. See role.invalid. + tdp_mmu_root_count: + An atomic reference counter in TDP MMU that allows for parallel + accesses. Accessing the page requires lifting the counter value. The + initial value is set as 2 indicating one reference from vCPU and one + from TDP MMU itself. While this counter is nonzero, the page cannot be + destroyed. Note this field is a union with root_count. parent_ptes: The reverse mapping for the pte/ptes pointing at this page's spt. If parent_ptes bit 0 is zero, only one spte points at this page and -- 2.41.0.162.gfafddb0af9-goog
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