From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E362C2472B6; Tue, 11 Aug 2026 15:01:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786460519; cv=none; b=hMmGpPseJTYZqdieoYctYiBuBOCMQv3JeOskHIbiBWpVElKXVD++LFLbuVpl97B0fmMhxS0MeB9viq4dMnmsPfF3MO/8zUW9wWJ881cfgFMrWxXZEe0Wrfb7xRjjnctE/Z0kbOOzVNynZthlpUqGciFXBzaoodgPuDviI0+vWcw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786460519; c=relaxed/simple; bh=5UYS20zcl93ZD2GvJ7ph/fpF1Dtf3Q7qsIbwI3L6D54=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=O/X3fTQDyFYcYXnhT58qGwTmYnObVu4jHFOFzKSRYIZ1hZ2nAbGnVlkUIRnemzONKRHMTjckwSjdxvMLHDUcbrvmnrJLyFoqnE5p14481hqidp6rGV92ReOBOklDXjzTn9lRvxcLdIasZ8Eqsy9SyrK7ovc4MRFtqNFRxXhihQI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=MJ9h2tj3; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="MJ9h2tj3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B33EC1F000E9; Tue, 11 Aug 2026 15:01:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1786460517; bh=ftk6Ob5ePi2NG4+2csEQu5wySUZgPfdaprbJPeK1WJM=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=MJ9h2tj3g/fUBUHukKY9PqJ7Phm1sT71oEsJp6U1a6kRBd2IZ/39qxMaceNktm9hb 4CeC9k52d+jvQcHEAJOFRDHVgAo7R2OY5LhBFgvO5OGHUxFDfswQP0S266ajMhZhYY 3srq8rMdTdgdEEKoi+XWt4awhuIJwsV7lgAlblGBdm+BjQ2wcO52dTCLQRI5IIYx9h T1V/SL7mYsLb1FrUxKBT0j3JzZ27EnPZgQuVQ05pnfmcUDQjO4s8Ahkyi68Pi4GAaw wy6w4hOnPOA2IRuguPhkHZCuCdQ/Y812icVTYLviXr95MGCdA4CvM4peVjtdO4/tMS TKGpwgD77TJCg== Date: Tue, 11 Aug 2026 09:01:55 -0600 From: Tycho Andersen To: Yosry Ahmed Cc: Paolo Bonzini , Sean Christopherson , Linus Torvalds , "Kernel Mailing List, Linux" , kvm , Borislav Petkov , Tom Lendacky Subject: Re: [GIT PULL] KVM (mostly s390) fixes for Linux 7.2-rc7 Message-ID: References: <20260807135327.2629594-1-pbonzini@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Mon, Aug 10, 2026 at 02:30:12PM -0700, Yosry Ahmed wrote: > On Fri, Aug 7, 2026 at 10:43 PM Paolo Bonzini wrote: > > > > Il sab 8 ago 2026, 00:39 Sean Christopherson ha scritto: > > > On Fri, Aug 07, 2026, Paolo Bonzini wrote: > > > > I consider two weeks of wait, on a review that so far had been > > > > exclusively about taste, to *be* an honest attempt to gather the next > > > > round of feedback (which never came). > > > > > > Heh, and I was waiting for a response to Yosry's thread: > > > https://lore.kernel.org/all/CAO9r8zODKgCcjTBK=P6BuXBBZRoOAFMeRJU8BmkWL-BCX2LoBw@mail.gmail.com > > > > Heh^2, "Pick your poison, I guess" was not really inviting a response. > > Overall the sense of my reply to you (that is: there are two callers > > so let's not overthink wrappers) applied just as much to his message; > > and checking AMD vs. Intel in common code is a total no-no so I kept > > the reply in one place. > > Aside from the code itself, I was really hoping for a better > understanding of the problem, and answers from AMD/Hyper-V folks if > possible. > > Basically: > > (a) Is INVLPGA intended to be used with NPT enabled to flush GVA > translations on behalf of the guest? > > I assume the answer is yes, and something is broken. But if the answer > is no, then we shouldn't be looking any further and the fix proposed > by you/Sean is correct regardless. I think the answer here is "no", but we would like to introduce a slightly different fix. In terms of my reproducing, I may have been doing it this whole time: Alexander's ssh script for liveness checking was working, but the uptimes of some of the VMs are different, suggesting that BSODs were happening along with automatic reboots. I'll see if I can get windows to stop doing that. I'm also about to go out of office for a while (kid++), so adding Boris and Tom to the thread. Thanks, Tycho