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 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
