On Mon, May 23, 2011 at 05:34:20PM +0300, Avi Kivity wrote:
> On 05/23/2011 05:28 PM, Joerg Roedel wrote:
>> To user-space we can provide a VCPU_FREEZE/VCPU_UNFREEZE ioctl which
>> does all the necessary things.
>
> Or we can automatically flush things on any exit to userspace. They
> should be very rare in guest mode.
This would make nesting mostly transparent to migration, so it sounds
good in this regard.
I do not completly agree that user-space exits in guest-mode are rare,
this depends on the hypervisor in the L1. In Hyper-V for example the
root-domain uses hardware virtualization too and has direct access to
devices (at least to some degree). IOIO is not intercepted in the
root-domain, for example. Not sure about the MMIO regions.
Joerg
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