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 DB0573EBF16; Thu, 19 Feb 2026 19:11:24 +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=1771528284; cv=none; b=JgJwUvsYx9Y9zmkhUOh8UPV/Rdz9hIz2wZcLfjdJSJbhjQNpezpM1BS/byxEHdD8GCVNpF3FilEvzIbdruckFWE3CBw64yWyiiXPJP+yZ4Zb4OUytR/xCopcechB/9+1V5UdqmT4bV3r9CiN3u20JLt5/IFFA3ebBKqNLMDtsW8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771528284; c=relaxed/simple; bh=9p0DfwiEGsHS8N8lLhDzityaVkttEOvhog9ekktjRc0=; h=Date:Message-ID:From:To:Cc:Subject:In-Reply-To:References: MIME-Version:Content-Type; b=JGRQQksXbMgqxY+8C1PyeQR36p4BaAemHwydXkxMgBRu99r3dyVedr70DH0TbS+T3jbM5MpC7jAD4PgyqUmcw4c/v0fp4WZumdLVJBQx+58KGxuIdNn5K2axknk4jTdxfY5XZtxtt6ilOo1ipWHU2+hz0nptiHl3iiNlZD7wxRk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=iLZa/tdX; 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="iLZa/tdX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A29BFC4CEF7; Thu, 19 Feb 2026 19:11:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771528284; bh=9p0DfwiEGsHS8N8lLhDzityaVkttEOvhog9ekktjRc0=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=iLZa/tdXSjtY+IhPqpxbOkvU6uy46FeFU74mPUys5QXzxKsoXkOBfNqr48ShSG0w5 /+Ofhedr1cNJ3oFPoDQUmLpoBxP000NdDP6CrN2xt66ZkExL19bY+933OZayflXn+Y XS2zN8HFCLAqCH/GlmDwm8hS68m5rmsneq+/jlvbwZkuqI1R3uYxjkQF622aaYZr57 YGhylOf1FRe2j3Ehl82WXL6jd4zKN0cDpIwTmlBUWLXoA64zYwfSnRMPpegBICFnHJ aiJBmIoG3ISn88YHnQLEitUwHJLQ075DETetkxXmN+FUellgKGfKY2ze2NxKsvgyLx iXaTWxw7wKdYA== Received: from sofa.misterjones.org ([185.219.108.64] helo=lobster-girl.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1vt9Qo-0000000CFY6-0SoG; Thu, 19 Feb 2026 19:11:22 +0000 Date: Thu, 19 Feb 2026 19:11:21 +0000 Message-ID: <87cy20eeg6.wl-maz@kernel.org> From: Marc Zyngier To: Steven Rostedt Cc: Vincent Donnefort , mhiramat@kernel.org, mathieu.desnoyers@efficios.com, linux-trace-kernel@vger.kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, jstultz@google.com, qperret@google.com, will@kernel.org, aneesh.kumar@kernel.org, kernel-team@android.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH v12 00/30] Tracefs support for pKVM In-Reply-To: <20260219130220.063c8db3@gandalf.local.home> References: <20260219150307.14538-1-vdonnefort@google.com> <20260219130220.063c8db3@gandalf.local.home> 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/30.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org 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: rostedt@goodmis.org, vdonnefort@google.com, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, linux-trace-kernel@vger.kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, jstultz@google.com, qperret@google.com, will@kernel.org, aneesh.kumar@kernel.org, kernel-team@android.com, linux-kernel@vger.kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false On Thu, 19 Feb 2026 18:02:20 +0000, Steven Rostedt wrote: > > On Thu, 19 Feb 2026 15:02:37 +0000 > Vincent Donnefort wrote: > > > The growing set of features supported by the hypervisor in protected > > mode necessitates debugging and profiling tools. Tracefs is the > > ideal candidate for this task: > > > > * It is simple to use and to script. > > > > * It is supported by various tools, from the trace-cmd CLI to the > > Android web-based perfetto. > > > > * The ring-buffer, where are stored trace events consists of linked > > pages, making it an ideal structure for sharing between kernel and > > hypervisor. > > > > This series first introduces a new generic way of creating remote events and > > remote buffers. Then it adds support to the pKVM hypervisor. > > > > So I finished my review of all the tracing patches, but I just realized > that there's likely going to be some major conflicts with changes in the > tracing tree that's going to happen against this series. > > To solve that, after -rc2 comes out, I'll apply the tracing portion of this > series to a branch in my tree directly on top of -rc2 and I will then use > that to base my changes for the next merge window. > > Then the arm/kvm folks could start with that branch and add the arm/KVM > portion of this series on top of it. This will prevent major merge > conflicts in linux-next. > > Does that sound OK? That works. Just send us a link to the branch after -rc2 and we'll get that sorted. Thanks, M. -- Jazz isn't dead. It just smells funny.