diff options
| author | Sean Christopherson <seanjc@google.com> | 2021-09-01 15:10:22 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-09-06 06:19:07 -0400 |
| commit | ca41c34cab1f50f13ab5ac95739483871637a684 (patch) | |
| tree | f063a1b1da093fb634e41bcda131bb3180ad1991 /arch | |
| parent | e7177339d7b5f9594b316842122b5fda9513d5e2 (diff) | |
KVM: x86/mmu: Relocate kvm_mmu_page.tdp_mmu_page for better cache locality
Move "tdp_mmu_page" into the 1-byte void left by the recently removed
"mmio_cached" so that it resides in the first 64 bytes of kvm_mmu_page,
i.e. in the same cache line as the most commonly accessed fields.
Don't bother wrapping tdp_mmu_page in CONFIG_X86_64, including the field in
32-bit builds doesn't affect the size of kvm_mmu_page, and a future patch
can always wrap the field in the unlikely event KVM gains a 1-byte flag
that is 32-bit specific.
Note, the size of kvm_mmu_page is also unchanged on CONFIG_X86_64=y due
to it previously sharing an 8-byte chunk with write_flooding_count.
No functional change intended.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210901221023.1303578-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/mmu/mmu_internal.h | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h index 6b6f10895710..4e7b634efa38 100644 --- a/arch/x86/kvm/mmu/mmu_internal.h +++ b/arch/x86/kvm/mmu/mmu_internal.h @@ -35,6 +35,7 @@ struct kvm_mmu_page { struct hlist_node hash_link; struct list_head lpage_disallowed_link; + bool tdp_mmu_page; bool unsync; u8 mmu_valid_gen; bool lpage_disallowed; /* Can't be replaced by an equiv large page */ @@ -70,8 +71,6 @@ struct kvm_mmu_page { atomic_t write_flooding_count; #ifdef CONFIG_X86_64 - bool tdp_mmu_page; - /* Used for freeing the page asynchronously if it is a TDP MMU page. */ struct rcu_head rcu_head; #endif |