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authorSean Christopherson <seanjc@google.com>2021-09-01 15:10:22 -0700
committerPaolo Bonzini <pbonzini@redhat.com>2021-09-06 06:19:07 -0400
commitca41c34cab1f50f13ab5ac95739483871637a684 (patch)
treef063a1b1da093fb634e41bcda131bb3180ad1991 /arch
parente7177339d7b5f9594b316842122b5fda9513d5e2 (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.h3
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