Messages in this thread | | | Date | Mon, 20 Apr 2009 10:59:51 +0200 | From | Gerd Hoffmann <> | Subject | Re: [PATCH] Add MCE support to KVM |
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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. 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".
> The Hyper-V hypercall page is more problematic, as it's specified to > be an overlay; the page doesn't have to exist in guest RAM.
In userspace it should be easy to handle though as qemu can just create a new memory slot, right?
cheers, Gerd
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