From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 4780E433A4 for ; Thu, 19 Dec 2024 10:07:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734602862; cv=none; b=Xwf7SVK2nX9i7wPzd6nYzOf9kNzxTHoe3CBL+JLbsGZb5fahgNJ48yjXYQiRkiB242r+sr9wc8NZac8x3Vpqx7a5rdSW2gpK8t4feA/vlEEM2LMqxadtM/GTAXFbzV7QdUFpJAw/tSQZDvIFnHjFpLz0Z9xCpZ0y7AloJFXxKAA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734602862; c=relaxed/simple; bh=kTpvFJZx81GGCddn1uaeuT6TXgrOaV1RGpXPH6ZTP/U=; h=Date:Message-ID:From:To:Cc:Subject:In-Reply-To:References: MIME-Version:Content-Type; b=RMO/5MEy73Vf5OfdKVXWotEz6Zh4NLg0ufvUbJ6qZmxTaKRzm1UBPic5Ta1QmxA5hrkIsrFKAQIieRb5L4CmqdVKTAA2VlTVRY2HOzakXvBpeGdqT9DFX1+frpCt53ZPi+fjbU4v0nrXOw+Ou4+BlcQo/7S47e11iYPXW3SayUg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=AxvsVQjd; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="AxvsVQjd" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CC50FC4CECE; Thu, 19 Dec 2024 10:07:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1734602861; bh=kTpvFJZx81GGCddn1uaeuT6TXgrOaV1RGpXPH6ZTP/U=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=AxvsVQjd06HGvwlk4/6Qit6g/wiN63+LMk/9MD0DkTuAry4irqSpYTa9GUx9Uo71t wenrpuTxjUatdixUvRIevXXaCvG5A3aTrokHhNL4uRotXGXkq5YPH/qmu+vCNFFF0D tRg7CXm8KUYTgUYWggNtD/7hG7JiKhZML56KLN6DWAAQ4+XqE3uIHh/u/Hr5CUUeYj /of2Qcmk0CKIhmGEfAfMXmYjhiaS7jg5o7yE1B8VbRiTRv4+onQmIw/UkFrGnJdHnk MZg+yedMLo13yHuKQnhTYJgAJAtR9jFvfD3BE4wCOF2kY2NvcG5SqCT0kJ9FUi5xaR xx+NeMjd08Pow== Received: from sofa.misterjones.org ([185.219.108.64] helo=goblin-girl.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1tODRT-005EQP-Lw; Thu, 19 Dec 2024 10:07:39 +0000 Date: Thu, 19 Dec 2024 10:07:39 +0000 Message-ID: <86a5csq93o.wl-maz@kernel.org> From: Marc Zyngier To: Shameer Kolothum Cc: , , , , , , , , , , , , , , Subject: Re: [PATCH v4 0/3] KVM: arm64: Errata management for VM Live migration In-Reply-To: <20241218105345.73472-1-shameerali.kolothum.thodi@huawei.com> References: <20241218105345.73472-1-shameerali.kolothum.thodi@huawei.com> 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/29.4 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: shameerali.kolothum.thodi@huawei.com, kvmarm@lists.linux.dev, oliver.upton@linux.dev, catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com, cohuck@redhat.com, eric.auger@redhat.com, sebott@redhat.com, yuzenghui@huawei.com, wangzhou1@hisilicon.com, jiangkunkun@huawei.com, jonathan.cameron@huawei.com, anthony.jebson@huawei.com, linux-arm-kernel@lists.infradead.org, linuxarm@huawei.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Hi Shameer, On Wed, 18 Dec 2024 10:53:42 +0000, Shameer Kolothum wrote: > > Hi, > > v3 --> v4(Minor updates) > https://lore.kernel.org/kvmarm/20241209115311.40496-1-shameerali.kolothum.thodi@huawei.com/ > > -Changed MIDR/REVIDR to 64 bits based on feedback from Connie > and Marc(Patch #3). > -Added R-by tags from Sebastian (Thanks!). Thanks again for putting this together. I think it would be really good to have a sample userspace implementation of this extension so that we can play with it for real before fully committing to it. I am also wondering is we should make it mandatory that a guest is presented with an MIDR_EL1.Implementer value set to 0, which denotes SW use, and would make it plain to the guest (and crucially, guest userspace) that we are going to play tricks. Thoughts? M. -- Without deviation from the norm, progress is not possible.