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[Xen-devel] Re: [PATCH] Allow guest to register a secondary vcpu_time_in
| To: | Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] Re: [PATCH] Allow guest to register a secondary vcpu_time_info structure |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Tue, 06 Oct 2009 08:10:27 +0100 |
| Cc: | Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Tue, 06 Oct 2009 00:11:04 -0700 |
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| Thread-index: | AcpGGWPCVErznzFjTbm4UxglwdLSjAAOrDSg |
| Thread-topic: | [PATCH] Allow guest to register a secondary vcpu_time_info structure |
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On 06/10/2009 01:10, "Jeremy Fitzhardinge" <jeremy@xxxxxxxx> wrote: > The second vcpu_time_info structure is updated by copy, rather than > being a shared page between the guest and Xen. It is not directly > updated by copy; instead, Xen preserves and increments the existing > version number in place. This allows the guest to also update the > version number (useful to indicate vcpu context switches to usermode). > This assumes that the guest will only ever update the structure for a > given vcpu on that vcpu (as Xen does, so there are never any cross-cpu > accesses). How do you feel about the 32-bit version number? We have space to easily expand it to 64 bits, and now would be the time to do it while we're extending the ABI. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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