Re: [kvm-unit-tests PATCH v3 00/20] x86: Better backtraces for leaf functions

[Sean Christopherson <seanjc@google.com>]

On Thu, May 21, 2026, Mathias Krause wrote:
> On 21.05.26 12:48, Paolo Bonzini wrote:
> > On Thu, May 21, 2026 at 12:35 PM Mathias Krause <minipli@grsecurity.net> wrote:
> >>> I'm applying patches 1-18, adding the last two give
> >>
> >> Looks like Sean already integrated them into
> >> https://github.com/kvm-x86/kvm-unit-tests, including the fixups that
> >> came up during review.
> > 
> > Oopsie. I've merged manually everything from there up to commit
> > 0ddb0873cf4f1bd584c0981836778b795bab94f0.
> > 
> > Let's post what's left as a new submission to the mailing list.
> 
> In this case, Sean, can you please fold in the fixup for bbe76fbda4e1
> ("x86: Prevent realmode test code instrumentation with nop-mcount") I
> posted at [1]?

Given that the last two patches are yours, and that I can barely follow what the
patches are doing, can you post a new standalone mini-series with those two patches,
and whatever changes are needed to make 'em work?

> The cc-option test for -mfentry is probably too conservative but there
> were versions of gcc between 8 and 9 that did support -mnop-mcount but
> not -mfentry and the latter was, apparently, not needed until recently.
> 
> [1]
> https://lore.kernel.org/kvm/092d0688-0c8d-4b82-bb62-abeb26845df3@grsecurity.net/
> 
> Thanks,
> Mathias