Alexander Graf wrote:
On 30.10.2008, at 20:29, Avi Kivity wrote:
Alexander Graf wrote:
I don't see any benefit from actually exporting that MSR atm. KVM
does never read it and it'd just add additional overhead on every
userspace transition, as it'd need to be synced every time.
We only sync MSRs on save/restore.
Oh, really? Looks like I interpreted that code wrong :-).
Nevertheless, we don't use the hsave given by the guest OS, because we
can't trust it. So saving and restoring a non-used value sounds pretty
useless - unless you're migrating from KVM to Qemu. Is this kind of
migration (going to be) possible?
But what if the guest tries to reread the hsave value it wrote?
Couldn't that break a guest?
Regards,
Anthony Liguori
Alex
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