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 X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 49FEEC0650F for ; Thu, 8 Aug 2019 11:31:21 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 16C1F217F4 for ; Thu, 8 Aug 2019 11:31:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="OTnuMTMg" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 16C1F217F4 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-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=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject: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=fP39+fWUjLJNjYwmmrRUV4XQs+sSRD36fRx6RS2QEug=; b=OTnuMTMguuVo0f qBMfHwogo9dWVf7NvmYbYFe27irr0OY+Aa5I9hadyhDnbfQX5jPWnnb+e5wZQgePNTwDM0CNGqv2q kCNKeKx+artLrQp632QJvCV/+PAsF4z6Lo1PZA5gjZ5WYIaVk55Iv2lDxCEH05uIQoRyR5vfxlwwO WneSjWKmsv83YkKJP9/SaR7iOzHI4dp4/LdilbVrlVCGwc3U4MOjFKogH5sAKCp54rLNPLP/Jntig fBssYDwU6uwH6dqd8OO2CRC5134kijhDOgSBQ0DnomKVnV5lXvxx44tccEDL0Ndtu+6q0s73JwehC zoH4k8tP4tJop1m0+/bg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hvgdX-00078P-2t; Thu, 08 Aug 2019 11:31:15 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hvgdU-000786-AB for linux-arm-kernel@lists.infradead.org; Thu, 08 Aug 2019 11:31:13 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 51D0B1597; Thu, 8 Aug 2019 04:31:11 -0700 (PDT) Received: from arm.com (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 691A33F694; Thu, 8 Aug 2019 04:31:10 -0700 (PDT) Date: Thu, 8 Aug 2019 12:31:08 +0100 From: Dave Martin To: Stefan Agner Subject: Re: Detecting AArch32 support from a AArch64 process in user space Message-ID: <20190808113107.GI10425@arm.com> References: <7bfc8611-0b2c-9d6d-0348-afd580e2a403@arm.com> <2adcb1ed626fb7829481b2b8d0ff54d1@agner.ch> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <2adcb1ed626fb7829481b2b8d0ff54d1@agner.ch> User-Agent: Mutt/1.5.23 (2014-03-12) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190808_043112_400556_AB5198D4 X-CRM114-Status: GOOD ( 11.25 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Marc Zyngier , ynorov@caviumnetworks.com, will.deacon@arm.com, linux-arm-kernel@lists.infradead.org, suzuki.poulose@arm.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Aug 08, 2019 at 12:17:26PM +0200, Stefan Agner wrote: > On 2019-08-08 11:04, Marc Zyngier wrote: [...] > > Hey, you could create a VM, a vcpu and dump the ID registers by issuing > > a set of KVM_GET_ONE_REG ioctls. Not necessarily recommended... ;-) > > I see, no no, I think I leave that exercise for somebody else to try :) I think KVM guest AArch32 support can exist even when compat is configured out though. So just because it works in a guest doesn't mean that the host kernel supports it for userspace, IIUC. Otherwise, this would be a fun hack ;) Cheers ---Dave _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel