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

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To: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Subject: Re: [PATCH 3/6] x86/kvm/emulate: Avoid RET for fastops
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Sat, 26 Apr 2025 12:01:34 +0200
Cc: x86@xxxxxxxxxx, kys@xxxxxxxxxxxxx, haiyangz@xxxxxxxxxxxxx, wei.liu@xxxxxxxxxx, decui@xxxxxxxxxxxxx, tglx@xxxxxxxxxxxxx, mingo@xxxxxxxxxx, bp@xxxxxxxxx, dave.hansen@xxxxxxxxxxxxxxx, hpa@xxxxxxxxx, pawan.kumar.gupta@xxxxxxxxxxxxxxx, seanjc@xxxxxxxxxx, pbonzini@xxxxxxxxxx, ardb@xxxxxxxxxx, kees@xxxxxxxxxx, Arnd Bergmann <arnd@xxxxxxxx>, gregkh@xxxxxxxxxxxxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, linux-efi@xxxxxxxxxxxxxxx, samitolvanen@xxxxxxxxxx, ojeda@xxxxxxxxxx
In-reply-to: <20250416083859.GH4031@noisy.programming.kicks-ass.net>
References: <20250414111140.586315004@infradead.org> <20250414113754.172767741@infradead.org> <7vfbchsyhlsvdl4hszdtmapdghw32nrj2qd652f3pjzg3yb6vn@po3bsa54b6ta> <20250415074421.GI5600@noisy.programming.kicks-ass.net> <zgsycf7arbsadpphod643qljqqsk5rbmidrhhrnm2j7qie4gu2@g7pzud43yj4q> <20250416083859.GH4031@noisy.programming.kicks-ass.net>

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?

Follow-Ups:
- Re: [PATCH 3/6] x86/kvm/emulate: Avoid RET for fastops
  - From: Sean Christopherson

References:
- [PATCH 0/6] objtool: Detect and warn about indirect calls in __nocfi functions
  - From: Peter Zijlstra
- [PATCH 3/6] x86/kvm/emulate: Avoid RET for fastops
  - From: Peter Zijlstra
- Re: [PATCH 3/6] x86/kvm/emulate: Avoid RET for fastops
  - From: Josh Poimboeuf
- Re: [PATCH 3/6] x86/kvm/emulate: Avoid RET for fastops
  - From: Peter Zijlstra
- Re: [PATCH 3/6] x86/kvm/emulate: Avoid RET for fastops
  - From: Josh Poimboeuf
- Re: [PATCH 3/6] x86/kvm/emulate: Avoid RET for fastops
  - From: Peter Zijlstra

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