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Date: Mon, 10 Aug 2026 07:56:18 -0600
From: Tycho Andersen <tycho@kernel.org>
To: Sean Christopherson <seanjc@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>, torvalds@linux-foundation.org, 
	linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Yosry Ahmed <yosry@kernel.org>
Subject: Re: [GIT PULL] KVM (mostly s390) fixes for Linux 7.2-rc7
Message-ID: <annX2lP-5cCgRJBe@tycho.pizza>
References: <20260807135327.2629594-1-pbonzini@redhat.com>
 <anYQsMnpS2kpYoqA@google.com>
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In-Reply-To: <anYQsMnpS2kpYoqA@google.com>

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