Re: [GIT PULL] KVM (mostly s390) fixes for Linux 7.2-rc7

[Tycho Andersen]

On Fri, Aug 07, 2026 at 10:06:56AM -0700, Sean Christopherson wrote:
> +Yosry
> 
> On Fri, Aug 07, 2026, Paolo Bonzini wrote:
> > - disable use of INVLPGA when NPT is enabled, because it doesn't seem
> >   to flush TLBs correctly
> 
> ...
> 
> > Paolo Bonzini (3):
> >       KVM: SVM: make svm_flush_tlb_gva do a full asid flush if NPT enabled
> 
> Why did this get rushed in?  There was quite a bit of discussion, both on the
> code itself[1][2] and on the assessment that this appears to be hardware issue[3].
> IMO, neither of those discussions was resolved enough to merge the patch as-is.

I have tried Pretty Hard to reproduce this and not been successful. I
asked Alexander offlist for his disk image last week to try with that,
but haven't received a response yet.

We would definitely like a reproducer and to look into exactly what's
going on here.

Thanks,

Tycho