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spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; 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; bh=tMEE98c4PnNRIhXrdZKjL9EwLiTFgnWY2tdiPdJnalA=; b=AoiYFonbzeT3WNTcaovapWqua jzSMej5kOV1qj9tRTIlg6cpiaMX5dwUHepmrxc/VGSUIzyjpjdyE2LMk4lG6pLn0uxwuloscXddJC Yc7MTtqpgdkHSaDLTOmS30jZn2u4/07EVqqxNs9fqOM9enqpmlci6Vn5JPvH5+YZJ8Dt9CDZoay0/ 5DpFpVOHchCf4cwTWLvOHwAy6Ktlz37rFp9rSl1Viw14aNfzGYK1/b52BF3C/A5pWnwBNH9qJryf5 7FsuVcfln88MLaaRxBOprULhYVSE0DNs9jB5rMOWT3pD87puZHpgISXPgnf3sEsD9igB0hhvdkb5F x0yUp51AQ==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lMteC-005USX-Ee; Thu, 18 Mar 2021 14:29:12 +0000 Received: from mail.kernel.org ([198.145.29.99]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lMte6-005URb-U2 for linux-arm-kernel@lists.infradead.org; Thu, 18 Mar 2021 14:29:08 +0000 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 619D964EE1; Thu, 18 Mar 2021 14:29:05 +0000 (UTC) Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=why.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94) (envelope-from ) id 1lMte3-002Q6d-FD; Thu, 18 Mar 2021 14:29:03 +0000 Date: Thu, 18 Mar 2021 14:29:02 +0000 Message-ID: <871rccilht.wl-maz@kernel.org> From: Marc Zyngier To: Will Deacon Cc: kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, dave.martin@arm.com, daniel.kiss@arm.com, Catalin Marinas , James Morse , Julien Thierry , Suzuki K Poulose , broonie@kernel.org, ascull@google.com, qperret@google.com, kernel-team@android.com Subject: Re: [PATCH v2 09/11] KVM: arm64: Trap host SVE accesses when the FPSIMD state is dirty In-Reply-To: <20210318141144.GE7055@willie-the-truck> References: <20210318122532.505263-1-maz@kernel.org> <20210318122532.505263-10-maz@kernel.org> <20210318141144.GE7055@willie-the-truck> 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: 62.31.163.78 X-SA-Exim-Rcpt-To: will@kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, dave.martin@arm.com, daniel.kiss@arm.com, catalin.marinas@arm.com, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com, broonie@kernel.org, ascull@google.com, qperret@google.com, kernel-team@android.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-20210318_142907_159564_2D64578A X-CRM114-Status: GOOD ( 16.66 ) 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 Thu, 18 Mar 2021 14:11:44 +0000, Will Deacon wrote: > > On Thu, Mar 18, 2021 at 12:25:30PM +0000, Marc Zyngier wrote: > > ZCR_EL2 controls the upper bound for ZCR_EL1, and is set to > > a potentially lower limit when the guest uses SVE. In order > > to restore the SVE state on the EL1 host, we must first > > reset ZCR_EL2 to its original value. > > > > To make it as lazy as possible on the EL1 host side, set > > the SVE trapping in place when returning exiting from > > "returning exiting"? Meh. Kept the latter. Thanks, 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