From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 6E5752E973F for ; Thu, 25 Sep 2025 15:35:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758814516; cv=none; b=oXHzpbHzQmL4YYDYUbBF6S/NCW9ZJMACclIkcXX3Dfo4BOTvOvEy+cMEvnpA1m884MBBb49ltqkC5x2zl2Rl+OrMGwUB61WSpuIgfuO1gTiRVMEYiWB7NtHdUrK19O323vkjyOCMz68dmtyKrisxJF+V6whGGZ9wKdGfBTh+SaI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758814516; c=relaxed/simple; bh=9RMOr58npqlFN9KJI/5cx8j0vBrzDeQhyz21uBdUCKg=; h=Date:Message-ID:From:To:Cc:Subject:In-Reply-To:References: MIME-Version:Content-Type; b=ng/U/O7/cJcR5wY1BM9Ilr/imMwaJ2gb7bj2ZMdQofXJyRHkUm3sTxYAlDu5c1GIe0rT+VbhSOsDcVSzYbJASQe/uRvIXm56VLqd5+wwgoWiM3LQxTzGqOoix4F1BIPxQBwWtJhnqRiHP+ytflq8uEMr9eOxy5mYBc59XMcEMv4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hEmkmI7T; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="hEmkmI7T" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 03F4BC4CEF0; Thu, 25 Sep 2025 15:35:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1758814516; bh=9RMOr58npqlFN9KJI/5cx8j0vBrzDeQhyz21uBdUCKg=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=hEmkmI7Tl4yh4WjRwRWYX35jgS6tMSxdSzwbuMMT56weEd6LfRhVcVDhceleUtwz5 EX7BleKXGfPJyZRBYIaYx22mnl3yGg8UlmK2IOQOlbnt+4axyrLlBHckAAyxds/kVP 9EoOBDyviCgQ63Kl5vFdAgvuUxnQ8ufwKoOZpG4Kq8GGjYes6uoe8KJayDIVagjjF+ +uzynrftbythofbfCqT099+Ezcv9u/t4xyppESSPlrVI2OAeDobS2TAQE4242m25yc x7O9/yU535LmRowetJO7cR+Jd/CG1ZkDlGWOTgi1tuWFKwB+GpNJNrEZNF7mW72CpN tbXohwLpylCiw== Received: from sofa.misterjones.org ([185.219.108.64] helo=goblin-girl.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1v1o02-00000009PZn-05JP; Thu, 25 Sep 2025 15:35:14 +0000 Date: Thu, 25 Sep 2025 16:35:13 +0100 Message-ID: <864isq1r66.wl-maz@kernel.org> From: Marc Zyngier To: Jan Kotas Cc: Oliver Upton , "kvmarm@lists.linux.dev" Subject: Re: KVM NV + SVE host OS warning In-Reply-To: References: <799DD5E5-8BC2-47B3-A919-33429D3FB2F1@global.cadence.com> <865xd61tt5.wl-maz@kernel.org> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/30.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: jank@cadence.com, oliver.upton@linux.dev, kvmarm@lists.linux.dev X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false On Thu, 25 Sep 2025 16:10:22 +0100, Jan Kotas wrote: >=20 > Hi Marc, >=20 > Thank you for a quick response. >=20 > > On 25 Sep 2025, at 16:38, Marc Zyngier wrote: > >=20 > > EXTERNAL MAIL > >=20 > >=20 > > [+Oliver for the SVE stuff] > >=20 > > Hi Jan, [...] > >=20 > > I would also recommend to update to 6.17 -- 6.16 was the first release > > with NV, and while it may work, it will also have a lot of ugly bugs. >=20 > I will try, but as I don=E2=80=99t own this machine, changing kernels mig= ht > be=E2=80=A6 challenging. Well, you're already passing something on the command-line that is documented as "experimental and should be used with extreme caution". Changing the kernel is a walk in the park compared to that ;-). > If there=E2=80=99s anything else I can provide to help track it down, > please let me know. Testing the provided patch would be good -- I would if I could. M. --=20 Without deviation from the norm, progress is not possible.