[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Re: Live migration fails due to c/s 20627
On 15/12/2009 18:25, "Jeremy Fitzhardinge" <jeremy@xxxxxxxx> wrote: > On 12/15/2009 09:24 AM, Xu, Dongxiao wrote: >> If CPU has rdtsc but no rdtscp, then the VM exec control bit in VMCS >> won't be turned on. Therefore if rdtscp instruction runs, it will encounter >> invalid op code directly but no VMEXIT. >> > > Ah, right. You'd need to make that particular illegal instruction vmexit. We'd need to VMEXIT on any guest #UD and then call into our x86 emulator. There's just a slight feeling that could have wider impact and implications than the specific case we'd want to handle here. Then again, #UD is rare and usually unexpected, so perhaps such a seemingly broad change is not so dangerous. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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