Re: [Qemu-devel] [PATCH v5] i386: Introduce ARAT CPU feature

[Eduardo Habkost]

On Sun, Jun 07, 2015 at 11:15:08AM +0200, Jan Kiszka wrote:
> From: Jan Kiszka <address@hidden>
> 
> ARAT signals that the APIC timer does not stop in power saving states.
> As our APICs are emulated, it's fine to expose this feature to guests,
> at least when asking for KVM host features or with CPU types that
> include the flag. The exact model number that introduced the feature is
> not known, but reports can be found that it's at least available since
> Sandy Bridge.
> 
> Signed-off-by: Jan Kiszka <address@hidden>

The code looks good now, but: what are the real consequences of
enabling/disabling the flag? What exactly guests use it for?

Isn't this going to make guests have additional expectations about the
APIC timer that may be broken when live-migrating or pausing the VM?

-- 
Eduardo