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| author | Sean Christopherson <seanjc@google.com> | 2021-09-01 15:10:23 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-09-06 06:20:05 -0400 |
| commit | 1148bfc47be3f885a10945ecbc1e3789a0313603 (patch) | |
| tree | 36f8aa4b5f9b9615d5f85f41f51f68033dfe7399 /arch/x86/kvm | |
| parent | ca41c34cab1f50f13ab5ac95739483871637a684 (diff) | |
| download | linux-1148bfc47be3f885a10945ecbc1e3789a0313603.tar.bz2 | |
KVM: x86/mmu: Move lpage_disallowed_link further "down" in kvm_mmu_page
Move "lpage_disallowed_link" out of the first 64 bytes, i.e. out of the
first cache line, of kvm_mmu_page so that "spt" and to a lesser extent
"gfns" land in the first cache line. "lpage_disallowed_link" is accessed
relatively infrequently compared to "spt", which is accessed any time KVM
is walking and/or manipulating the shadow page tables.
No functional change intended.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210901221023.1303578-4-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
| -rw-r--r-- | arch/x86/kvm/mmu/mmu_internal.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h index 4e7b634efa38..bf2bdbf333c2 100644 --- a/arch/x86/kvm/mmu/mmu_internal.h +++ b/arch/x86/kvm/mmu/mmu_internal.h @@ -31,9 +31,12 @@ extern bool dbg; #define IS_VALID_PAE_ROOT(x) (!!(x)) struct kvm_mmu_page { + /* + * Note, "link" through "spt" fit in a single 64 byte cache line on + * 64-bit kernels, keep it that way unless there's a reason not to. + */ struct list_head link; struct hlist_node hash_link; - struct list_head lpage_disallowed_link; bool tdp_mmu_page; bool unsync; @@ -59,6 +62,7 @@ struct kvm_mmu_page { struct kvm_rmap_head parent_ptes; /* rmap pointers to parent sptes */ DECLARE_BITMAP(unsync_child_bitmap, 512); + struct list_head lpage_disallowed_link; #ifdef CONFIG_X86_32 /* * Used out of the mmu-lock to avoid reading spte values while an |