[MODERATED] Re: [PATCH 1/2] v3 more sampling fun 1

On Thu, Mar 12, 2020 at 01:34:50AM +0000, speck for Andrew Cooper wrote:
> Particularly with this issue where it seems that no hypervisor is
> interested in offering the knob to guest kernels (so could at least
> infer based on SRBDS_CTRL), nor is there an ARCH_CAPS_$FOO_NO bit which
> could be filled in by a hypervisor on unaffected or mitigated hardware.

Maybe that is the solution?  We allocated a s/w (VMM) bit in
ARCH_CAPABILITIES for the TLB DoS issue for the nested hypervisor case.
Should we do that again for this issue?

If you think so, then we can take this discussion to Keybase so
that the other VMM vendors who hang out there can chime in.

[Note that it isn't my call to allocate a bit in ARCH_CAPABILITIES,
but I can campaign for it if folks want it].

-Tony