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 C8505C282DE for ; Mon, 10 Mar 2025 18:50:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=1+ofQwuGVRqhE03VmsYlGEcNUurWgNiie1yoZECtaVQ=; b=WoqBiA1tTwrFZOrg12DCGPTUwZ cXkV+mUvlfU8VUr3im9oPnL/YnDw20TE7pCiWt8atpByGnG7g2V3utK0YKaasCqb/3zYpIFMXRulX LVdXWryLGr0SBhU30QJUU8acAmT5k6+4LN5tMd89S2dxTU0J0HjQLIlWd2cDNHQKdKT/mmqtRrQvI LMj0W4UGLKNScl3UxVCPQHK5xkJxsnxLs/GxUgvJnGz1wWO8W79wk0rH4eIy7KgTTk27IMoawnpKZ EMsJg9dI6HkXer5Igq1mNlQFSc5dPQAbZuSrRk+K6vM376MZknuVBm6d/m4TApOZ7NBj8Z7NVC/48 dX3MoRbA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1triCu-00000003fkj-0pnb; Mon, 10 Mar 2025 18:50:32 +0000 Received: from linux.microsoft.com ([13.77.154.182]) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1trh1v-00000003VoA-0Of0 for linux-arm-kernel@lists.infradead.org; Mon, 10 Mar 2025 17:35:08 +0000 Received: from [10.137.184.60] (unknown [131.107.160.188]) by linux.microsoft.com (Postfix) with ESMTPSA id 64E3B2038F33; Mon, 10 Mar 2025 10:35:05 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 64E3B2038F33 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1741628105; bh=1+ofQwuGVRqhE03VmsYlGEcNUurWgNiie1yoZECtaVQ=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=TKhga+c9cuJgMknPM13jAgQP1DCYNGUPpcl+c1m94c8yVqD62xkfoXvk7bLjOxBY2 Jd/ln5jDO+gGUjD6Z3n3nQwi1hJPN7SvGVn7aNlAeIKOpA9Lr5y1NMvcg21OqMdsUE Sb7ps3xymomjl6NcnK+v0qVmLnYE/BpYP3OBs4GY= Message-ID: Date: Mon, 10 Mar 2025 10:35:05 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH hyperv-next v5 03/11] Drivers: hv: Enable VTL mode for arm64 To: Arnd Bergmann , Michael Kelley Cc: apais@microsoft.com, benhill@microsoft.com, bperkins@microsoft.com, sunilmut@microsoft.com, bhelgaas@google.com, Borislav Petkov , Catalin Marinas , Conor Dooley , Dave Hansen , Dexuan Cui , Haiyang Zhang , "H. Peter Anvin" , Joey Gouly , krzk+dt@kernel.org, =?UTF-8?Q?Krzysztof_Wilczy=C5=84ski?= , "K. Y. Srinivasan" , Len Brown , Lorenzo Pieralisi , Manivannan Sadhasivam , Mark Rutland , Marc Zyngier , Ingo Molnar , Oliver Upton , "Rafael J . Wysocki" , Rob Herring , ssengar@linux.microsoft.com, Sudeep Holla , Suzuki K Poulose , Thomas Gleixner , Wei Liu , Will Deacon , Zenghui Yu , devicetree@vger.kernel.org, kvmarm@lists.linux.dev, linux-acpi@vger.kernel.org, Linux-Arch , linux-arm-kernel@lists.infradead.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, x86@kernel.org References: <20250307220304.247725-1-romank@linux.microsoft.com> <20250307220304.247725-4-romank@linux.microsoft.com> Content-Language: en-US From: Roman Kisel In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250310_103507_183923_7557D745 X-CRM114-Status: GOOD ( 15.01 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 3/8/2025 1:05 PM, Arnd Bergmann wrote: > On Fri, Mar 7, 2025, at 23:02, Roman Kisel wrote: >> @@ -5,18 +5,20 @@ menu "Microsoft Hyper-V guest support" >> config HYPERV >> tristate "Microsoft Hyper-V client drivers" >> depends on (X86 && X86_LOCAL_APIC && HYPERVISOR_GUEST) \ >> - || (ACPI && ARM64 && !CPU_BIG_ENDIAN) >> + || (ARM64 && !CPU_BIG_ENDIAN) >> + depends on (ACPI || HYPERV_VTL_MODE) >> select PARAVIRT >> select X86_HV_CALLBACK_VECTOR if X86 >> - select OF_EARLY_FLATTREE if OF >> help >> Select this option to run Linux as a Hyper-V client operating >> system. >> >> config HYPERV_VTL_MODE >> bool "Enable Linux to boot in VTL context" >> - depends on X86_64 && HYPERV >> + depends on (X86_64 || ARM64) >> depends on SMP >> + select OF_EARLY_FLATTREE >> + select OF >> default n >> help > > Having the dependency below the top-level Kconfig entry feels a little > counterintuitive. You could flip that back as it was before by doing > > select HYPERV_VTL_MODE if !ACPI > depends on ACPI || SMP > > in the HYPERV option, leaving the dependency on HYPERV in > HYPERV_VTL_MODE. > I was implementing Michael's suggestion, and might've gone a bit overboard, my bad. I'll fix this, thanks a lot for reviewing! > Is OF_EARLY_FLATTREE actually needed on x86? > No, it is not needed on x86. It is only needed when VTL mode is used. > Arnd -- Thank you, Roman