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RE: [Xen-devel] Re: [PATCH] Fix cpu hotplug bug of mtrr update inconsist
| To: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | RE: [Xen-devel] Re: [PATCH] Fix cpu hotplug bug of mtrr update inconsistency |
| From: | "Liu, Jinsong" <jinsong.liu@xxxxxxxxx> |
| Date: | Wed, 2 Jun 2010 13:30:12 +0800 |
| Accept-language: | en-US |
| Acceptlanguage: | en-US |
| Cc: | |
| Delivery-date: | Tue, 01 Jun 2010 22:32:26 -0700 |
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| In-reply-to: | <C82A943C.165A7%keir.fraser@xxxxxxxxxxxxx> |
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| Thread-topic: | [Xen-devel] Re: [PATCH] Fix cpu hotplug bug of mtrr update inconsistency |
Keir Fraser wrote: > On 01/06/2010 10:18, "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx> wrote: > >> I suggest we leave the call where it is, and fix set_mtrr() to not >> race CPUs coming online. It is called elsewhere other than >> mtrr_ap_init() after all. Also if you call mtrr_ap_init() before >> being in cpu_online_map, you then race further MTRR changes: >> - CPU X calls mtrr_ap_init() >> - CPU Y calls set_mtrr() to actually change an MTRR. >> - CPU X adds itself to cpu_online_map >> - Aiee, CPU X is missing Y's update >> >> I'll make a patch. > > xen-unstable:21499. > > -- Keir Yeah, good method :) _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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