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=-5.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 0CCB8C433F5 for ; Mon, 20 Sep 2021 12:22:50 +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 C690B6109D for ; Mon, 20 Sep 2021 12:22:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org C690B6109D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org 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:MIME-Version:References:In-Reply-To: Subject:Cc:To:From:Message-ID:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=H1M7XRsEHKBuCp1c+pD0faS/ZdBHw+X/s0wFjqCsBFI=; b=Tosyt7Czzko+gQ 9b4koQKjc7VHoEzy2HSPpd8lKFHxa8WWn7Wv4gB6FJm2RDHKH14A84ClnNIyqL0zkF09HjuYJxtgb Gb8QuqNhfThqd/t9/YL4BcOSLr/MIs3vyO1W0pw4ZyPAtjldaVImE46j4vZ1lVKISYqYZ4sWPaTiD mcYeOsDn4VKVy9y4AvGpO3gGSPr9ZV6Ac8p49cq7jGlDULUPlFU9BjU01/u0OF59BjyhAUSLjWuQP tQQCUXOL/ccmqrg81O8F6qOlqu9BI3OmFCqF9Sqd/0tYVF1ETc7wbNBmHInCMlW1+hExUdJLE8To3 kqXmcwOOlyRb2/ungyoA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mSIJQ-001WlX-TZ; Mon, 20 Sep 2021 12:22:20 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mSIJD-001Wi5-3l; Mon, 20 Sep 2021 12:22:08 +0000 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id CD81460F9D; Mon, 20 Sep 2021 12:22:06 +0000 (UTC) Received: from sofa.misterjones.org ([185.219.108.64] helo=why.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1mSIJA-00BkwX-Th; Mon, 20 Sep 2021 13:22:04 +0100 Date: Mon, 20 Sep 2021 13:22:04 +0100 Message-ID: <87tuifv3mb.wl-maz@kernel.org> From: Marc Zyngier To: Paolo Bonzini Cc: Peter Zijlstra , Sean Christopherson , Ingo Molnar , Arnaldo Carvalho de Melo , Will Deacon , Mark Rutland , Catalin Marinas , Guo Ren , Nick Hu , Greentime Hu , Vincent Chen , Paul Walmsley , Palmer Dabbelt , Albert Ou , Thomas Gleixner , Borislav Petkov , x86@kernel.org, Boris Ostrovsky , Juergen Gross , Alexander Shishkin , Jiri Olsa , Namhyung Kim , James Morse , Alexandru Elisei , Suzuki K Poulose , "H. Peter Anvin" , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Stefano Stabellini , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-csky@vger.kernel.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, Artem Kashkanov , Like Xu , Zhu Lingshan Subject: Re: [PATCH v2 00/13] perf: KVM: Fix, optimize, and clean up callbacks In-Reply-To: <662e93f9-e858-689d-d203-742731ecad2c@redhat.com> References: <20210828003558.713983-1-seanjc@google.com> <20210828201336.GD4353@worktop.programming.kicks-ass.net> <662e93f9-e858-689d-d203-742731ecad2c@redhat.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/27.1 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: pbonzini@redhat.com, peterz@infradead.org, seanjc@google.com, mingo@redhat.com, acme@kernel.org, will@kernel.org, mark.rutland@arm.com, catalin.marinas@arm.com, guoren@kernel.org, nickhu@andestech.com, green.hu@gmail.com, deanbo422@gmail.com, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, tglx@linutronix.de, bp@alien8.de, x86@kernel.org, boris.ostrovsky@oracle.com, jgross@suse.com, alexander.shishkin@linux.intel.com, jolsa@redhat.com, namhyung@kernel.org, james.morse@arm.com, alexandru.elisei@arm.com, suzuki.poulose@arm.com, hpa@zytor.com, vkuznets@redhat.com, wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org, sstabellini@kernel.org, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-csky@vger.kernel.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, artem.kashkanov@intel.com, like.xu.linux@gmail.com, lingsha n.zhu@intel.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210920_052207_235508_69B11ECF X-CRM114-Status: GOOD ( 22.47 ) X-BeenThere: linux-riscv@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-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Mon, 20 Sep 2021 13:05:25 +0100, Paolo Bonzini wrote: > > On 17/09/21 09:28, Peter Zijlstra wrote: > >> In theory, I like the idea of burying intel_pt inside x86 (and even in > >> Intel+VMX code for the most part), but the actual implementation is a > >> bit gross. Because of the whole "KVM can be a module" thing, > > > > ARGH!! we should really fix that. I've heard other archs have made much > > better choices here. > > I think that's only ARM, and even then it is only because of > limitations of the hardware which mostly apply only if VHE is not in > use. > > If anything, it's ARM that should support module build in VHE mode > (Linux would still need to know whether it will be running at EL1 or > EL2, but KVM's functionality is as self-contained as on x86 in the VHE > case). I don't see this happening anytime soon. At least not before we declare the arm64 single kernel image policy to be obsolete. M. -- Without deviation from the norm, progress is not possible. _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv