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SubjectRe: [PATCH] Add MCE support to KVM
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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