Re: Thoughts of AMX KVM support based on latest kernel

Paolo Bonzini
2021-11-17T07:31:31Z

On 11/17/21 05:52, Nakajima, Jun wrote:
> If a (creative) guest wants to set XFD[AMX] = 1 for fun while keeping
> AMX state alive without saving the AXM state, it may lose the state
> after VM exit/entry.

I think this should not happen, unless you also document that other
random events (hypothetically, it could be some other core using AMX?)
can cause the loss of XTILEDATA if XFD[AMX]=1. Virtualization should
not be special, I'd prefer that the guest has the same behavior as bare
metal in this respect.

Paolo