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Re: [Xen-devel] x86's context switch ordering of operations
| To: | "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] x86's context switch ordering of operations |
| From: | "Jan Beulich" <jbeulich@xxxxxxxxxx> |
| Date: | Tue, 29 Apr 2008 16:37:44 +0100 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Tue, 29 Apr 2008 08:37:46 -0700 |
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>>> Keir Fraser <keir.fraser@xxxxxxxxxxxxx> 29.04.08 15:58 >>>
>Um, good point, I'd forgotten exactly how the code fitted together. Anyhow,
>the reason you see ctxt_switch_{from,to} happening after set_current() is
>because context_switch() and __context_switch() can actually be decoupled.
>When switching to the idle vcpu we run context_switch() but we do not run
>__context_switch().
Okay, that could be easily dealt with by doing set_current() explicitly
in the switch-to-idle case, and moving it into __context_switch() in
the other cases.
Any word on the significance of doing write_ptbase() after calling
ctxt_switch_to()?
Jan
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