linux-kernel - Re: [PATCH 3/6] x86/kvm/emulate: Avoid RET for fastops

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Message-ID: <20250429100919.GH4198@noisy.programming.kicks-ass.net>
Date: Tue, 29 Apr 2025 12:09:19 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Josh Poimboeuf <jpoimboe@...nel.org>, x86@...nel.org, kys@...rosoft.com,
	haiyangz@...rosoft.com, wei.liu@...nel.org, decui@...rosoft.com,
	tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
	dave.hansen@...ux.intel.com, hpa@...or.com,
	pawan.kumar.gupta@...ux.intel.com, pbonzini@...hat.com,
	ardb@...nel.org, kees@...nel.org, Arnd Bergmann <arnd@...db.de>,
	gregkh@...uxfoundation.org, linux-hyperv@...r.kernel.org,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	linux-efi@...r.kernel.org, samitolvanen@...gle.com,
	ojeda@...nel.org
Subject: Re: [PATCH 3/6] x86/kvm/emulate: Avoid RET for fastops

On Mon, Apr 28, 2025 at 10:13:31AM -0700, Sean Christopherson wrote:
> On Sat, Apr 26, 2025, Peter Zijlstra wrote:
> > On Wed, Apr 16, 2025 at 10:38:59AM +0200, Peter Zijlstra wrote:
> > 
> > > Yeah, I finally got there. I'll go cook up something else.
> > 
> > Sean, Paolo, can I once again ask how best to test this fastop crud?
> 
> Apply the below, build KVM selftests, 

Patch applied, my own hackery applied, host kernel built and booted,
foce_emulation_prefix set, but now I'm stuck at this seemingly simple
step..

$ cd tools/testing/selftests/kvm/
$ make
... metric ton of fail ...

Clearly I'm doing something wrong :/