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=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 1532FC0650E for ; Wed, 3 Jul 2019 16:13:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D9218218A0 for ; Wed, 3 Jul 2019 16:13:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726955AbfGCQN5 (ORCPT ); Wed, 3 Jul 2019 12:13:57 -0400 Received: from foss.arm.com ([217.140.110.172]:51754 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726574AbfGCQN4 (ORCPT ); Wed, 3 Jul 2019 12:13:56 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 2DB5B344; Wed, 3 Jul 2019 09:13:56 -0700 (PDT) Received: from e103592.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 5FEE63F718; Wed, 3 Jul 2019 09:13:55 -0700 (PDT) Date: Wed, 3 Jul 2019 17:13:53 +0100 From: Dave Martin To: Marc Zyngier Cc: kvm@vger.kernel.org, Andre Przywara , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH 02/59] KVM: arm64: Move __load_guest_stage2 to kvm_mmu.h Message-ID: <20190703161353.GT2790@e103592.cambridge.arm.com> References: <20190621093843.220980-1-marc.zyngier@arm.com> <20190621093843.220980-3-marc.zyngier@arm.com> <20190624111924.GK2790@e103592.cambridge.arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Wed, Jul 03, 2019 at 10:30:03AM +0100, Marc Zyngier wrote: > On 24/06/2019 12:19, Dave Martin wrote: > > On Fri, Jun 21, 2019 at 10:37:46AM +0100, Marc Zyngier wrote: > >> Having __load_guest_stage2 in kvm_hyp.h is quickly going to trigger > >> a circular include problem. In order to avoid this, let's move > >> it to kvm_mmu.h, where it will be a better fit anyway. > >> > >> In the process, drop the __hyp_text annotation, which doesn't help > >> as the function is marked as __always_inline. > > > > Does GCC always inline things marked __always_inline? > > > > I seem to remember some gotchas in this area, but I may be being > > paranoid. > > Yes, this is a strong guarantee. Things like static keys rely on that, > for example. > > > > > If this still only called from hyp, I'd be tempted to heep the > > __hyp_text annotation just to be on the safe side. > > The trouble with that is that re-introduces the circular dependency with > kvm_hyp.h that this patch is trying to break... Ah, right. I guess it's easier to put up with this, then. Cheers ---Dave 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=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 DD6D4C0650E for ; Wed, 3 Jul 2019 16:14:00 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 6FE6B218A0 for ; Wed, 3 Jul 2019 16:14:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6FE6B218A0 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvmarm-bounces@lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id CCE204A51B; Wed, 3 Jul 2019 12:13:59 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 64d5T8lfEzST; Wed, 3 Jul 2019 12:13:58 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id A587B4A4FF; Wed, 3 Jul 2019 12:13:58 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id C95444A4CD for ; Wed, 3 Jul 2019 12:13:57 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ttIng-A9dXnW for ; Wed, 3 Jul 2019 12:13:56 -0400 (EDT) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 847384A4A4 for ; Wed, 3 Jul 2019 12:13:56 -0400 (EDT) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 2DB5B344; Wed, 3 Jul 2019 09:13:56 -0700 (PDT) Received: from e103592.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 5FEE63F718; Wed, 3 Jul 2019 09:13:55 -0700 (PDT) Date: Wed, 3 Jul 2019 17:13:53 +0100 From: Dave Martin To: Marc Zyngier Subject: Re: [PATCH 02/59] KVM: arm64: Move __load_guest_stage2 to kvm_mmu.h Message-ID: <20190703161353.GT2790@e103592.cambridge.arm.com> References: <20190621093843.220980-1-marc.zyngier@arm.com> <20190621093843.220980-3-marc.zyngier@arm.com> <20190624111924.GK2790@e103592.cambridge.arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) Cc: linux-arm-kernel@lists.infradead.org, Andre Przywara , kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu On Wed, Jul 03, 2019 at 10:30:03AM +0100, Marc Zyngier wrote: > On 24/06/2019 12:19, Dave Martin wrote: > > On Fri, Jun 21, 2019 at 10:37:46AM +0100, Marc Zyngier wrote: > >> Having __load_guest_stage2 in kvm_hyp.h is quickly going to trigger > >> a circular include problem. In order to avoid this, let's move > >> it to kvm_mmu.h, where it will be a better fit anyway. > >> > >> In the process, drop the __hyp_text annotation, which doesn't help > >> as the function is marked as __always_inline. > > > > Does GCC always inline things marked __always_inline? > > > > I seem to remember some gotchas in this area, but I may be being > > paranoid. > > Yes, this is a strong guarantee. Things like static keys rely on that, > for example. > > > > > If this still only called from hyp, I'd be tempted to heep the > > __hyp_text annotation just to be on the safe side. > > The trouble with that is that re-introduces the circular dependency with > kvm_hyp.h that this patch is trying to break... Ah, right. I guess it's easier to put up with this, then. Cheers ---Dave _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm 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=-2.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 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 D0816C0650E for ; Wed, 3 Jul 2019 16:14:09 +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 A6132218A0 for ; Wed, 3 Jul 2019 16:14:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="EWP9YJ5S" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A6132218A0 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject: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=m194yoVm9WAjAPsTkzNCYySwCM57cBMPCuIqf7RWtVc=; b=EWP9YJ5SUN6svF CTZ+Wqrdlu5LkwGbvFWuaNwsX45P2pUTaoRM3QKs44B8hyFijsuzWtgF9JC3I67e5MuKjzAh+dSv1 ddStjuC1t0QvP3MouV6BB8+bOGqdDg06/l8q4iobBVCfkzfeADGudVeY3WyhETefzUX5UkGCdm/Ln /x89caypeATyvI0uVAR3BY87txMRhJkdZFIzeWEX0tcQRA5zXKDFjIirxnn6moDxgu29r9JBsU4Ax W+DbAxpOj9vC7tCscrCQ+T/vjSA+36Wpj/5F33VMq3MjUxA1UAOXfohY2V+ABWQ7E4ZYxT2fgka8M 0ChpoEHlqG1Fm7T7L51Q==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hihtR-0001FY-CT; Wed, 03 Jul 2019 16:14:01 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hihtO-0001ED-R3 for linux-arm-kernel@lists.infradead.org; Wed, 03 Jul 2019 16:14:00 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 2DB5B344; Wed, 3 Jul 2019 09:13:56 -0700 (PDT) Received: from e103592.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 5FEE63F718; Wed, 3 Jul 2019 09:13:55 -0700 (PDT) Date: Wed, 3 Jul 2019 17:13:53 +0100 From: Dave Martin To: Marc Zyngier Subject: Re: [PATCH 02/59] KVM: arm64: Move __load_guest_stage2 to kvm_mmu.h Message-ID: <20190703161353.GT2790@e103592.cambridge.arm.com> References: <20190621093843.220980-1-marc.zyngier@arm.com> <20190621093843.220980-3-marc.zyngier@arm.com> <20190624111924.GK2790@e103592.cambridge.arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190703_091358_924305_29745191 X-CRM114-Status: GOOD ( 17.42 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arm-kernel@lists.infradead.org, Andre Przywara , kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Jul 03, 2019 at 10:30:03AM +0100, Marc Zyngier wrote: > On 24/06/2019 12:19, Dave Martin wrote: > > On Fri, Jun 21, 2019 at 10:37:46AM +0100, Marc Zyngier wrote: > >> Having __load_guest_stage2 in kvm_hyp.h is quickly going to trigger > >> a circular include problem. In order to avoid this, let's move > >> it to kvm_mmu.h, where it will be a better fit anyway. > >> > >> In the process, drop the __hyp_text annotation, which doesn't help > >> as the function is marked as __always_inline. > > > > Does GCC always inline things marked __always_inline? > > > > I seem to remember some gotchas in this area, but I may be being > > paranoid. > > Yes, this is a strong guarantee. Things like static keys rely on that, > for example. > > > > > If this still only called from hyp, I'd be tempted to heep the > > __hyp_text annotation just to be on the safe side. > > The trouble with that is that re-introduces the circular dependency with > kvm_hyp.h that this patch is trying to break... Ah, right. I guess it's easier to put up with this, then. Cheers ---Dave _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel