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 797A6C433F5 for ; Mon, 17 Jan 2022 16:58:48 +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:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=cseilIuNlDGTpI9/ilQ/Qm3l+tc+CCLvRrGLCSdOUd0=; b=lq9n9CdiLJ5s9a 2YaKp0gdUmy50WESZAvLkqMTbZ607Qk6Nc+c2uPuHT8K9QPuh+hTbVxn/Ocw3hJk5qaGEsxwHVPUL jWxeTxg0xshHs9NFe0TEwJFyfh4TkqCoe379rxJ6IUPpgurafoivVYSqb3x9b8urNDJV5s5wW7CPx 56/H2+wg4u+QMR8+q7EkHTpdsI2TLazQ5P3rC7nr8Lm5qb86ia+WeUo9HUy2qUv24TnwdbF4UGgo0 dRjXxUNMwJNPQJ9g9xe9jk6vu8p+0aWZu9DigMRJUnwusKaE55U5xPZC/j4J8VoW4NQ+1i6jQhBHP HneXQ6kmNHx1bnGdSMqg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1n9VK5-00FeFf-3B; Mon, 17 Jan 2022 16:57:37 +0000 Received: from pandora.armlinux.org.uk ([2001:4d48:ad52:32c8:5054:ff:fe00:142]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1n9VK1-00FeF8-6M for linux-arm-kernel@lists.infradead.org; Mon, 17 Jan 2022 16:57:34 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Sender: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-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=yHWRLlRI9bn6GVVwZA6rSW6DL/TTFRIYe9kwoc6Tfq8=; b=BZcYL9devfiMA5mpw714+i66I+ /uYs84bal7O5nwUXGFomOWM6xGy00o9Eo5Vs/gQcHjdDUCWKP8y6TkJg6hmGGZRZPYjmGg/F/A7nw apF66Fj2hkgWpIuoMpNC0kMXwo0X3i4qL8qo5PxgyQkdZLIjQkhuOteePuw/lfH5MQNBzJEUWUhs5 JK8gxKKscyg+zgsHAMR0kwxZzgUBCzFKqLNZ9W0tbcZDM7DeO4okPw9/F8E8rY79gqxMRFNZAnzME b+cW2A2OtfsSGpeVzSl7fzBTWOzKdkJwlAyoTN1bHEawgs1ijgzmJ48YiSFJvMiZCSuil8Az1/EYX PKWXMyYQ==; Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:56734) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1n9VJu-0002rW-CX; Mon, 17 Jan 2022 16:57:26 +0000 Received: from linux by shell.armlinux.org.uk with local (Exim 4.94.2) (envelope-from ) id 1n9VJn-0003UD-Mo; Mon, 17 Jan 2022 16:57:19 +0000 Date: Mon, 17 Jan 2022 16:57:19 +0000 From: "Russell King (Oracle)" To: Marc Zyngier Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, Andre Przywara , Christoffer Dall , Jintack Lim , Haibo Xu , Ganapatrao Kulkarni , James Morse , Suzuki K Poulose , Alexandru Elisei , kernel-team@android.com Subject: Re: [PATCH v5 07/69] KVM: arm64: nv: Introduce nested virtualization VCPU feature Message-ID: References: <20211129200150.351436-1-maz@kernel.org> <20211129200150.351436-8-maz@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20211129200150.351436-8-maz@kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220117_085733_254191_87FDF01E X-CRM114-Status: GOOD ( 10.34 ) 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 Mon, Nov 29, 2021 at 08:00:48PM +0000, Marc Zyngier wrote: > From: Christoffer Dall > > Introduce the feature bit and a primitive that checks if the feature is > set behind a static key check based on the cpus_have_const_cap check. > > Checking nested_virt_in_use() on systems without nested virt enabled > should have neglgible overhead. > > We don't yet allow userspace to actually set this feature. > > Signed-off-by: Christoffer Dall > Signed-off-by: Marc Zyngier Reviewed-by: Russell King (Oracle) -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last! _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel