KVM: optimize apic interrupt delivery
Most interrupt are delivered to only one vcpu. Use pre-build tables to
find interrupt destination instead of looping through all vcpus. In case
of logical mode loop only through vcpus in a logical cluster irq is sent
to.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 43aeb94..0b902c9 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -525,6 +525,16 @@
struct kvm_lpage_info *lpage_info[KVM_NR_PAGE_SIZES - 1];
};
+struct kvm_apic_map {
+ struct rcu_head rcu;
+ u8 ldr_bits;
+ /* fields bellow are used to decode ldr values in different modes */
+ u32 cid_shift, cid_mask, lid_mask;
+ struct kvm_lapic *phys_map[256];
+ /* first index is cluster id second is cpu id in a cluster */
+ struct kvm_lapic *logical_map[16][16];
+};
+
struct kvm_arch {
unsigned int n_used_mmu_pages;
unsigned int n_requested_mmu_pages;
@@ -542,6 +552,8 @@
struct kvm_ioapic *vioapic;
struct kvm_pit *vpit;
int vapics_in_nmi_mode;
+ struct mutex apic_map_lock;
+ struct kvm_apic_map *apic_map;
unsigned int tss_addr;
struct page *apic_access_page;