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| author | Wei Huang <wei.huang2@amd.com> | 2011-05-09 11:39:23 +0100 |
|---|---|---|
| committer | Wei Huang <wei.huang2@amd.com> | 2011-05-09 11:39:23 +0100 |
| commit | 5968755d6dab2b3e193bdaf1d23658d3f1328a25 (patch) | |
| tree | f4fb78f9015766fc70f665080abfa20daa9a91db /xen/include/asm-x86/i387.h | |
| parent | 0217c28adbb1656e72ce68239eb6092fdc7cde0c (diff) | |
| download | xen-5968755d6dab2b3e193bdaf1d23658d3f1328a25.tar.gz xen-5968755d6dab2b3e193bdaf1d23658d3f1328a25.tar.bz2 xen-5968755d6dab2b3e193bdaf1d23658d3f1328a25.zip | |
x86/fpu: create lazy and non-lazy FPU restore functions
Currently Xen relies on #NM (via CR0.TS) to trigger FPU context
restore. But not all FPU state is tracked by TS bit. This function
creates two FPU restore functions: vcpu_restore_fpu_lazy() and
vcpu_restore_fpu_eager(). vcpu_restore_fpu_lazy() is still used when
#NM is triggered. vcpu_restore_fpu_eager(), as a comparision, is
called for vcpu which is being scheduled in on every context
switch. To minimize restore overhead, it creates a flag,
nonlazy_xstate_used, to control non-lazy restore.
Signed-off-by: Wei Huang <wei.huang2@amd.com>
Diffstat (limited to 'xen/include/asm-x86/i387.h')
| -rw-r--r-- | xen/include/asm-x86/i387.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/xen/include/asm-x86/i387.h b/xen/include/asm-x86/i387.h index f3a7df0229..27399c0bbf 100644 --- a/xen/include/asm-x86/i387.h +++ b/xen/include/asm-x86/i387.h @@ -14,7 +14,8 @@ #include <xen/types.h> #include <xen/percpu.h> -void vcpu_restore_fpu(struct vcpu *v); +void vcpu_restore_fpu_eager(struct vcpu *v); +void vcpu_restore_fpu_lazy(struct vcpu *v); void vcpu_save_fpu(struct vcpu *v); int vcpu_init_fpu(struct vcpu *v); |