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Re: [Xen-devel] [PATCH][RFC] FPU LWP 3/5: define new FPU interface funct
| To: | "Wei Huang" <wei.huang2@xxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH][RFC] FPU LWP 3/5: define new FPU interface functions: fpu_save, fpu_restore, fpu_reload |
| From: | "Jan Beulich" <JBeulich@xxxxxxxxxx> |
| Date: | Fri, 15 Apr 2011 10:11:21 +0100 |
| Cc: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Fri, 15 Apr 2011 02:10:53 -0700 |
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| In-reply-to: | <4DA75B57.404@xxxxxxx> |
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>>> On 14.04.11 at 22:38, Wei Huang <wei.huang2@xxxxxxx> wrote: > Current Xen implementation only support lazy FPU reload via CR0.TS. But > new FPU state isn't always tracked by CR0.TS bit. One example is AMD's > lightweight profiling. With this patch, Xen calls fpu_save() on vcpu > which is being scheduled out and fpu_restore() on vcpu which is being > scheduled in. The nonlazy FPU state is saved and restored in these two > functions. This doesn't match the actual patch - only fpu_restore() is being added to the context switch path, fpu_save() was there already, saving both lazy and non-lazy state. > This patch also defines fpu_reload() to handle lazy FPU state when #NM > is triggered. > > Signed-off-by: Wei Huang <wei.huang2@xxxxxxx> >... >+/* Restore VCPU's FPU state when the vcpu is scheduled out */ >+void fpu_restore(struct vcpu *v) The comment ought so say "in" rather than "out". Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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