From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-176.mta0.migadu.com (out-176.mta0.migadu.com [91.218.175.176]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C70564E1D2 for ; Wed, 1 May 2024 08:17:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.176 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714551457; cv=none; b=ab3DurJAezAAyzhmcAC1VCqDl2vVlQxnafHEQgh2AMNjKpvt9daX5W/dvD5ymz3lyYgbJiZ6uOQzxy7TrgYuRZZ86tDqqZwwscIDXb4y3blZC4LEk0AALXr53NFqUwSrzoDnP7MaTuhhhmiwfeuLMVDySru5vHoBsFUodCv67vI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714551457; c=relaxed/simple; bh=MNK5gLF/R3MmhNubtHY49Z4q3G20BNl/rBdmK8H7BG8=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=SamkQt8wkqxDRRZNhGBPm3mLZ5LpCdcuGPZoycbXU2qq4+Tv1vMxiGTd2ZwgPONeC/xCcOzZglKHwrcTOA4V/MIUFU3u9/MuDKtvcu4zlQRkUwOuOQpJKMh9XV25d2dFc/n+fSKsxSi6XOqHzPdqItMw+bFYGwy4zOsxRHvJD/M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=MIwH6gqc; arc=none smtp.client-ip=91.218.175.176 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="MIwH6gqc" Date: Wed, 1 May 2024 08:17:30 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1714551453; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=akW+2UMs2xoloXlr720i0CCqdD/KMrFp+0W48l7CE/E=; b=MIwH6gqcLnuS2znrPZs4k8FP7bQYUTCRBRlB3CubDp2sfoKsbpAowrVD2I8jIe32QOQxD4 vsNGZtvghVrvnorcdQEGF0cO/8rRalhFMj0yjWAOZ5JMjivARWW/3Go/9xCZY2xn3zxZI8 aKXxqiEY+SrUnVP3LLvW9oJ/LBSxfCM= X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Oliver Upton To: Sebastian Ott Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, Marc Zyngier , James Morse , Suzuki K Poulose , Catalin Marinas , Will Deacon Subject: Re: [PATCH v2 0/6] KVM: arm64: emulation for CTR_EL0 Message-ID: References: <20240426104950.7382-1-sebott@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240426104950.7382-1-sebott@redhat.com> X-Migadu-Flow: FLOW_OUT Hi Sebastian, On Fri, Apr 26, 2024 at 12:49:44PM +0200, Sebastian Ott wrote: > Hej folks, > > I'm looking into supporting migration between 2 Ampere Altra (Max) > machines (using Neoverse-N1). They are almost identical regarding > their feature id register state except for CTR_EL0.DIC which is set > on one machine but not the other. > > CTR_EL0 is currently marked as invariant and migrating a VM between > those 2 machines using qemu fails. I left some feedback on the series, but in addition to that would it be possible to augment the set_id_regs selftest to exercise the CTR_EL0 mutability? -- Thanks, Oliver