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 mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8457CC43334 for ; Wed, 20 Jul 2022 09:30:05 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 00C9D4CF9E; Wed, 20 Jul 2022 05:30:05 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Authentication-Results: mm01.cs.columbia.edu (amavisd-new); dkim=softfail (fail, message has been altered) header.i=@kernel.org Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id kLWc77TXwRSK; Wed, 20 Jul 2022 05:30:03 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id CFB634CF8D; Wed, 20 Jul 2022 05:30:03 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id AC5C84CF8D for ; Wed, 20 Jul 2022 05:30:02 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id UgMu9MppDdIU for ; Wed, 20 Jul 2022 05:30:01 -0400 (EDT) Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 80BF64CF8B for ; Wed, 20 Jul 2022 05:30:01 -0400 (EDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 43C54B81EB3; Wed, 20 Jul 2022 09:30:00 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0D3E4C3411E; Wed, 20 Jul 2022 09:29:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1658309399; bh=Phz+YWd+DcqweUutFdlcYiu3GURZNE1BaXMUzpsP+74=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=GXJCNyOPQLAzSoS3NXnj8av0Q9BvY1KhKY+mnyoV1ncVf3R5oHWET9FTHBeCWX7uQ gIgG8n3ztdb/1+gUFZegJ3P7J6gVspoTGoA5bje41Nr1XrxmDExDZGYmZ7zf5oRwSp wwGlTqiaJVGQdC6/lmOPx0xt0XE3NR1VOjXd9dLHQvL4vL5o3K3jX8CKCisjp5NnhP FlimlLFF/wBkcJZv86vylNbgj9/kTosY16/gNL4p4Dt2zZWn3S/HKMALxwHUA1slSY cY4jMwysMwc4qdcypCfEnCbbqyqAq0ZpTKgwZChu127RRd5Dly3VM25Vlv7kaMWLEF hNnvDcD3VvSqQ== Received: from sofa.misterjones.org ([185.219.108.64] helo=why.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1oE61k-008jwx-Ms; Wed, 20 Jul 2022 10:29:56 +0100 Date: Wed, 20 Jul 2022 10:29:56 +0100 Message-ID: <878rooyvvv.wl-maz@kernel.org> From: Marc Zyngier To: Mark Brown Subject: Re: [PATCH v2 7/7] arm64/sve: Don't zero non-FPSIMD register state on syscall by default In-Reply-To: References: <20220620124158.482039-1-broonie@kernel.org> <20220620124158.482039-8-broonie@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/27.1 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: broonie@kernel.org, catalin.marinas@arm.com, will@kernel.org, zhang.lei@jp.fujitsu.com, james.morse@arm.com, alexandru.elisei@arm.com, andre.przywara@arm.com, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, mark.rutland@arm.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Cc: Catalin Marinas , Zhang Lei , Andre Przywara , Will Deacon , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu On Tue, 19 Jul 2022 20:35:46 +0100, Mark Brown wrote: > > On Tue, Jul 19, 2022 at 06:35:37PM +0100, Catalin Marinas wrote: > > IIRC both Will and Mark R commented in the past that they'd like the > > current de-facto ABI to become the official one. I'll let them comment. > > That would be good. I've not heard anything from Will either directly > or indirectly. Mark R has indicated privately directly to me that he > originally pushed for the currently implemented behaviour and prefers > it. Marc Zyngier has previously noted publicly the current behaviour > being a consideration in the context of discusion of optimisation ideas > like this one, I was a bit surprised that he commented on an earlier > patch in the series but not this one. Just because I don't repeat myself doesn't mean I changed my mind. I still don't buy the ABI change, as there is already a large(-ish) body of SW that assumes the current semantics. M. -- Without deviation from the norm, progress is not possible. _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm 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 A9487C433EF for ; Wed, 20 Jul 2022 09:31:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Subject:Cc:To:From:Message-ID:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; 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Wed, 20 Jul 2022 09:30:00 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0D3E4C3411E; Wed, 20 Jul 2022 09:29:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1658309399; bh=Phz+YWd+DcqweUutFdlcYiu3GURZNE1BaXMUzpsP+74=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=GXJCNyOPQLAzSoS3NXnj8av0Q9BvY1KhKY+mnyoV1ncVf3R5oHWET9FTHBeCWX7uQ gIgG8n3ztdb/1+gUFZegJ3P7J6gVspoTGoA5bje41Nr1XrxmDExDZGYmZ7zf5oRwSp wwGlTqiaJVGQdC6/lmOPx0xt0XE3NR1VOjXd9dLHQvL4vL5o3K3jX8CKCisjp5NnhP FlimlLFF/wBkcJZv86vylNbgj9/kTosY16/gNL4p4Dt2zZWn3S/HKMALxwHUA1slSY cY4jMwysMwc4qdcypCfEnCbbqyqAq0ZpTKgwZChu127RRd5Dly3VM25Vlv7kaMWLEF hNnvDcD3VvSqQ== Received: from sofa.misterjones.org ([185.219.108.64] helo=why.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1oE61k-008jwx-Ms; Wed, 20 Jul 2022 10:29:56 +0100 Date: Wed, 20 Jul 2022 10:29:56 +0100 Message-ID: <878rooyvvv.wl-maz@kernel.org> From: Marc Zyngier To: Mark Brown Cc: Catalin Marinas , Will Deacon , Zhang Lei , James Morse , Alexandru Elisei , Andre Przywara , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, Mark Rutland Subject: Re: [PATCH v2 7/7] arm64/sve: Don't zero non-FPSIMD register state on syscall by default In-Reply-To: References: <20220620124158.482039-1-broonie@kernel.org> <20220620124158.482039-8-broonie@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/27.1 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: broonie@kernel.org, catalin.marinas@arm.com, will@kernel.org, zhang.lei@jp.fujitsu.com, james.morse@arm.com, alexandru.elisei@arm.com, andre.przywara@arm.com, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, mark.rutland@arm.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220720_023004_417016_A35FD143 X-CRM114-Status: GOOD ( 19.12 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, 19 Jul 2022 20:35:46 +0100, Mark Brown wrote: > > On Tue, Jul 19, 2022 at 06:35:37PM +0100, Catalin Marinas wrote: > > IIRC both Will and Mark R commented in the past that they'd like the > > current de-facto ABI to become the official one. I'll let them comment. > > That would be good. I've not heard anything from Will either directly > or indirectly. Mark R has indicated privately directly to me that he > originally pushed for the currently implemented behaviour and prefers > it. Marc Zyngier has previously noted publicly the current behaviour > being a consideration in the context of discusion of optimisation ideas > like this one, I was a bit surprised that he commented on an earlier > patch in the series but not this one. Just because I don't repeat myself doesn't mean I changed my mind. I still don't buy the ABI change, as there is already a large(-ish) body of SW that assumes the current semantics. M. -- Without deviation from the norm, progress is not possible. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel