From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8BF8CCD4840 for ; Mon, 11 May 2026 12:31:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=xkCvZoAY5oDD05o+wGI+Hfj49WqA42ugK7+zzh3tsZs=; b=EvQNRTL2J2gdNZmL3JK21Q3LI+ W3i9PEzGvFWixc1Rj8pX9XptLMlEr69W7P1sPN9u2RJiuzN8lkyL1amHQz10LRUc+SB2EhJE+30hf hEGUB1IbuMsaxe42xHKMZuWk8vNpUvF6BYgqkSk2nmwmkVlerW+dKTbCPJ0Z1171OIlsyGRdn+/BK PAJ9BuNbDNGRiJ8h0k2acHtmNrlQkl210KgZ0abIgdpJv6k7sY7F8Cedt2zmJGXLxFyqwhFMl+5PH i+vJ6x8YFZ7G7Jl7nLXEllqEuTHOgQptUPKulSE7a/ALSctSltJZIqNoQZhlRW4csDpFT4LkLCX4I AeBjf6eA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wMPmz-0000000DXXv-1P4T; Mon, 11 May 2026 12:31:13 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wMPmw-0000000DXWR-2udS for linux-arm-kernel@lists.infradead.org; Mon, 11 May 2026 12:31:11 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 76AA740DC0; Mon, 11 May 2026 12:31:09 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 37C90C2BCB0; Mon, 11 May 2026 12:31:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778502669; bh=4cj4AFpxR7VfRzsb4XVcpSOKHntygkHpeH2TRzpG76A=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=Ik+Jsoeg6Q3DJuanPHz1lpNamzmd17Yr5QPCV8lyzZTR8FB/LKe+SXBQRARyF3Q6E ugGWVkLSx7xQOY2BOpClEh36pzqyfKnvC/6lBvcZNDtCRocKIM4VnXlk2Jk4QSDHY6 fIhnWYrcmxdyarFsFke6+3jj7kE38dPsZIsTKtGv43mZcGCF0tH37wnju55G8vayL1 l5Uj4B7pK9w4MJR2hHx6sIJg37t4GoDh7lquM0WSg6eHo3uGZWmY2DNGWjuA1YB3Pl 5batzUW6ViddTwtV6B7gw53TbJHoAuZBsxoahpSezLjrNCGGgBz6IMl7VUfifq6jz+ o/fVhTzgqoYeA== Received: by finisterre.sirena.org.uk (Postfix, from userid 1000) id 1B24E1AC58A9; Mon, 11 May 2026 13:31:07 +0100 (BST) Date: Mon, 11 May 2026 21:31:07 +0900 From: Mark Brown To: Mark Rutland Cc: Marc Zyngier , Joey Gouly , Catalin Marinas , Suzuki K Poulose , Will Deacon , Paolo Bonzini , Jonathan Corbet , Shuah Khan , Oliver Upton , Dave Martin , Fuad Tabba , Ben Horgan , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Peter Maydell , Eric Auger Subject: Re: [PATCH v10 01/30] arm64/sysreg: Update SMIDR_EL1 to DDI0601 2025-06 Message-ID: References: <20260306-kvm-arm64-sme-v10-0-43f7683a0fb7@kernel.org> <20260306-kvm-arm64-sme-v10-1-43f7683a0fb7@kernel.org> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="pfCVkcJhE9mTQmhr" Content-Disposition: inline In-Reply-To: X-Cookie: Truckers welcome. X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260511_053110_817305_724CF1D1 X-CRM114-Status: GOOD ( 24.24 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --pfCVkcJhE9mTQmhr Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Mon, May 11, 2026 at 11:40:02AM +0100, Mark Rutland wrote: > On Sat, May 09, 2026 at 09:43:11AM +0900, Mark Brown wrote: > > We're exposing the affinity fields so there's a build time issue. > What I'm asking is what is the rationale for updating these definitions? > e.g. > * Are we planning to use any of the fields in a specific way in the > *host*? > * Are we planning to use any of the fields in a specific way in the > *guest*? > * Is this updated just out of habit? > Knowing the rationale would help with review, even if that rationale is > just "it seemed nice to use the latest". The immediate motivation for including this in the current series is the above. > Which people are aware? Probably a conversation best taken off list. > > > Do we expect to expose that to VMs, or just hide priorities entirely? I > > > suspect we probably want to require that the guest sees > > > SMIDR_EL1.SMPS==0, and not care about any of that. > > Currently we're not exposing priority support to guests so we don't need > > to worry about it yet. > Do we plan to in future? The plan to evaluate the priority support that hardware implements in the context of practical systems and consider if and how to expose it for either hosts or guests, we need to ensure we've got a good understanding of the system impacts and user needs. Architecturally the priority support is all very implementation defined. --pfCVkcJhE9mTQmhr Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAABCgAdFiEEreZoqmdXGLWf4p/qJNaLcl1Uh9AFAmoBzAoACgkQJNaLcl1U h9DPQAf/SInPpjUAtj1bRvp1YePRMRh2qdaVto7ygoI98Dhsvq+5UWD7dCYSDKJt 2aAm55eLL3hSs4fkLK4HPUnXDsBez6ZxoGQPvFtcuM74FRKPBHuKQ9GvWB6ueO08 owAzkEPBUqaDWkHup7eQwXwlXtksLw2WaTniQaAaKLprrLIDAr97U30kaLowRMbm /1HPUx42NG+yEZs7O0KfEPKzl6WdApz2zxBxRgLYzgs3QHKJDiQZ9g9z1NryLgSK +QHdfRFhN/iRUaHqgHY50zCrysR8LUXjYSjS/VbSk3c4O1m2AF0GV84j3uwAunYy 4Y6zZmylTgiqhjTcKPAYWPsp8DKdiQ== =Gq3j -----END PGP SIGNATURE----- --pfCVkcJhE9mTQmhr--