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Re: [Xen-devel] [PATCH] Fix races in iret hypercall
| To: | Christoph Egger <Christoph.Egger@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] Fix races in iret hypercall |
| From: | Keir Fraser <keir@xxxxxxxxxxxxx> |
| Date: | Thu, 09 Aug 2007 09:44:41 +0100 |
| Delivery-date: | Thu, 09 Aug 2007 01:42:31 -0700 |
| Envelope-to: | www-data@xxxxxxxxxxxxxxxxxx |
| In-reply-to: | <200708091035.08282.Christoph.Egger@xxxxxxx> |
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| Thread-index: | AcfaYYa0xVa1iUZUEdyJlwAX8io7RQ== |
| Thread-topic: | [Xen-devel] [PATCH] Fix races in iret hypercall |
| User-agent: | Microsoft-Entourage/11.3.3.061214 |
On 9/8/07 09:35, "Christoph Egger" <Christoph.Egger@xxxxxxx> wrote: > Attached patch fixes races seen on SMP when multiple HVM guests > execute the iret instruction at the same time. > > current vcpu can change in the middle of do_iret(). This is fine as a cleanup, but it does not fix any bugs! For two reasons: 1. Current vcpu *cannot* change in the middle of do_iret(). Xen does not support involuntary preemption. 2. HVM guests do not ever execute do_iret(). That function is for pv guests only. How did you conclude there was a bug? -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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