Messages in this thread |  | | | Date | Mon, 20 Apr 2009 13:23:22 +0200 | | From | Gerd Hoffmann <> | | Subject | Re: [PATCH] Add MCE support to KVM |
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On 04/20/09 11:05, Avi Kivity wrote: > Gerd Hoffmann wrote: >> On 04/20/09 10:26, Avi Kivity wrote: >>> Gerd Hoffmann wrote: >>>> The xen pv-on-hvm drivers use an msr to indicate "please place the >>>> hypercall page here". Handling that in kernel isn't an option IMHO. >>> >>> The contents of the hypercall page are vendor specific. This can be >>> handled from userspace (though ideally we'd abstract the cpu vendor >>> away). >> >> Well, xenner doesn't do vmcalls, so the page isn't vendor specific. > > Well, for true pv (not pv-on-hvm) it wouldn't use the MSR, would it?
Yes, the MSR is used for pv-on-hvm only.
>> It looks different for 32bit / 64bit guests though. And it actually >> can be multiple pages (with one msr write per page). So the interface >> for in-kernel handling would be more complex than "here is a hypercall >> page for you". > > To different MSRs, or multiple writes to the same MSR?
Same MSR, multiple writes (page number in the low bits).
cheers, Gerd
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