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 9CD2AC4321E for ; Fri, 2 Dec 2022 18:56:09 +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=7rEB0LNU98KSd9iDEq1yMnfVUBVTkpEkm+gqHi8Yk30=; b=YtmiGf4VMJcfNx GVQUere2F2E/h7NhIsevfKOt9QJGxQZ+04u0vF1jCAG+lzCZE8Q0PWx2K/aTLBEvGnIks+ty3LPoK 3BTCWbZzY1E3TPtSyEQB2nZxn4oSN4kEuILoMdOABnwqxR+sWkYzRKB+n1LATHLYA+s35uD7gJKh7 qsMjRsxe6d5C9TTIZt4nXY9lA0Pkjot3JpymEjlH4fsAlkqcAFczdZ2Oqjrc4AG+TOZ0Vugrlt78d oBnGzmoco4s3FaSld9joJ3T803vBxQtaXcRtnBQUu7iltyMdihln8Lm/nxS/qSH/JrzYxRZnpHK7e lNTcAcxATCxNdbaFoUZg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1p1BBg-000ncB-Qg; Fri, 02 Dec 2022 18:55:05 +0000 Received: from out2.migadu.com ([2001:41d0:2:aacc::]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1p1BBc-000nXj-9A for linux-arm-kernel@lists.infradead.org; Fri, 02 Dec 2022 18:55:01 +0000 Date: Fri, 2 Dec 2022 18:54:51 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1670007296; 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=QF7YyY0zCO4x691PE+6++2gBpkKD4tpfGa6u+JeBMx4=; b=EXkS9mLpz+vLNs65I4j2M/dADkhs3aXj6C2J9/QQBDtzZvHcNqfe16I74H5FqC54X6IZh1 vDlLk2ztWLvPpDhIQey3K7nj4r9t8dEgpELG+MGppVJXr0vTOFEn8BqpFWmyYmdKr0UKQZ 7KgvNJRzvcj4Zw0lGfzfhiHCt5vdOM8= X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Oliver Upton To: Marc Zyngier Cc: Akihiko Odaki , linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, Mathieu Poirier , Suzuki K Poulose , Alexandru Elisei , James Morse , Will Deacon , Catalin Marinas , asahi@lists.linux.dev, Alyssa Rosenzweig , Sven Peter , Hector Martin Subject: Re: [PATCH 0/3] KVM: arm64: Handle CCSIDR associativity mismatches Message-ID: References: <20221201104914.28944-1-akihiko.odaki@daynix.com> <867czbmlh1.wl-maz@kernel.org> <87k03au36k.wl-maz@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <87k03au36k.wl-maz@kernel.org> X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221202_105500_509329_BFC08E57 X-CRM114-Status: GOOD ( 12.06 ) 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 Thu, Dec 01, 2022 at 11:14:43PM +0000, Marc Zyngier wrote: > On Thu, 01 Dec 2022 18:29:51 +0000, > Oliver Upton wrote: > > Could we extend your suggestion about accepting different topologies to > > effectively tolerate _any_ topology provided by userspace? KVM can > > default to the virtual topology, but a well-informed userspace could > > still provide different values to its guest. No point in trying to > > babyproofing the UAPI further, IMO. > > I think this is *exactly* what I suggested. Any valid topology should > be able to be restored, as we currently present the VM with any > topology the host HW may have. This must be preserved. Ah, I was narrowly reading into the conversation as it relates to the M2 implementation, my bad. SGTM :) -- Thanks, Oliver _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel