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 5EDA4C433EF for ; Mon, 17 Jan 2022 16:57:38 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id C2C4040FAB; Mon, 17 Jan 2022 11:57:37 -0500 (EST) 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=@armlinux.org.uk 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 f48qzmomUVn0; Mon, 17 Jan 2022 11:57:36 -0500 (EST) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 157C641173; Mon, 17 Jan 2022 11:57:36 -0500 (EST) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 946B340FAC for ; Mon, 17 Jan 2022 11:57:34 -0500 (EST) 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 RCPNBaLJMT7m for ; Mon, 17 Jan 2022 11:57:32 -0500 (EST) Received: from pandora.armlinux.org.uk (pandora.armlinux.org.uk [78.32.30.218]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id CB5F340FAB for ; Mon, 17 Jan 2022 11:57:32 -0500 (EST) 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 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> Cc: kernel-team@android.com, kvm@vger.kernel.org, Andre Przywara , Christoffer Dall , kvmarm@lists.cs.columbia.edu, Ganapatrao Kulkarni , 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 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! _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm