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| author | Avi Kivity <avi@redhat.com> | 2009-12-30 12:40:26 +0200 |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2010-03-01 12:35:50 -0300 |
| commit | 02daab21d94dc4cf01b2fd09863d59a436900322 (patch) | |
| tree | e7caff282dd9019e1b19cd549609c6b991f29152 /include/linux | |
| parent | e8467fda83cdc9de53972fee0cd2e6916cf66f41 (diff) | |
| download | linux-stable-02daab21d94dc4cf01b2fd09863d59a436900322.tar.gz linux-stable-02daab21d94dc4cf01b2fd09863d59a436900322.tar.bz2 linux-stable-02daab21d94dc4cf01b2fd09863d59a436900322.zip | |
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')
| -rw-r--r-- | include/linux/kvm_host.h | 1 |
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 @@ #define KVM_REQ_MMU_SYNC 7 #define KVM_REQ_KVMCLOCK_UPDATE 8 #define KVM_REQ_KICK 9 +#define KVM_REQ_DEACTIVATE_FPU 10 #define KVM_USERSPACE_IRQ_SOURCE_ID 0 |