On Mon, Feb 23, 2026 at 08:40:19AM -0800, Sean Christopherson wrote:
> On Mon, Feb 23, 2026, Tycho Andersen wrote:
> > From: "Tycho Andersen (AMD)" <[email protected]>
> >
> > The kernel allows setting the RAPL_DIS policy bit, but had no way to set
>
> Please actually say what RAPL_DIS is and does, and explain why this is the
> correct approach. I genuinely have no idea what the impact of this patch is,
> (beyond disabling something, obviously).
Sure, the easiest thing is probably to quote the firmware PDF:
Some processors support the Running Average Power Limit (RAPL)
feature which provides information about power utilization of
software. RAPL can be disabled using the RAPL_DIS flag in
SNP_INIT_EX to disable RAPL while SNP firmware is in the INIT
state. Guests may require that RAPL is disabled by using the
POLICY.RAPL_DIS guest policy flag.
I'll add this to the message in the next version.
I will also split out the RAPL_DIS stuff from the test fix for the
firmware update.
Tycho
