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authorAvi Kivity <avi@redhat.com>2009-12-30 05:40:26 -0500
committerMarcelo Tosatti <mtosatti@redhat.com>2010-03-01 10:35:50 -0500
commit02daab21d94dc4cf01b2fd09863d59a436900322 (patch)
treee7caff282dd9019e1b19cd549609c6b991f29152 /include/linux/kvm_host.h
parente8467fda83cdc9de53972fee0cd2e6916cf66f41 (diff)
KVM: Lazify fpu activation and deactivation
Defer fpu deactivation as much as possible - if the guest fpu is loaded, keep it loaded until the next heavyweight exit (where we are forced to unload it). This reduces unnecessary exits. We also defer fpu activation on clts; while clts signals the intent to use the fpu, we can't be sure the guest will actually use it. Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'include/linux/kvm_host.h')
-rw-r--r--include/linux/kvm_host.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index bb0314ea9267..dfde04b0d453 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -38,6 +38,7 @@
38#define KVM_REQ_MMU_SYNC 7 38#define KVM_REQ_MMU_SYNC 7
39#define KVM_REQ_KVMCLOCK_UPDATE 8 39#define KVM_REQ_KVMCLOCK_UPDATE 8
40#define KVM_REQ_KICK 9 40#define KVM_REQ_KICK 9
41#define KVM_REQ_DEACTIVATE_FPU 10
41 42
42#define KVM_USERSPACE_IRQ_SOURCE_ID 0 43#define KVM_USERSPACE_IRQ_SOURCE_ID 0
43 44