Re: [PATCH] x86/its: use Sapphire Rapids+ feature to opt out

[Jon Kohler <jon@nutanix.com>]

> On Oct 20, 2025, at 12:21 PM, Dave Hansen <dave.hansen@intel.com> wrote:
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> On 10/20/25 09:05, Jon Kohler wrote:
>> Was running into some testing issues with my qemu change internally,
>> but I’ll get that out this week once I clear them.
> 
> BTW, if there are folks out there that are working on things like QEMU
> and want more formal or regular notification from vendors that a FOO_NO
> bit has been added, that can probably be arranged.

That’d be nice! I’d be game for that.

> The real issue here is that nobody cared enough to get QEMU to
> comprehend ITS_NO right after the embargo was lifted, right?

As a general statement, yes, but I’m not privy to any conversations that
may have happened on non-googleable list(s), so it may have been
discussed but never materialized … or maybe it was never discussed
at all.

Net-net though, you’re right, the drama is that the guests/distros have
gotten hit with this, and on the virtualization platform side, we’ve
effectively had zero time to prepare for this.