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 C51DBC433F5 for ; Fri, 4 Mar 2022 17:43:39 +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=P095ikzsbZeAK+UkA6ZaKtt43wfPvFAwc37ia5dfXOQ=; b=JlIyKdkH/hhXN7 /G/o0/0cj0joJHDkqybEdbBNF1k3OVIDV0psdGPz36BwvYx4SQqZTfyTdr5Z/jeN2UXE2bBuyLXzH 0Qgd9X1T2FK9TgqkcqI4YIyxwFNZ3tmt5705LqFYKDSRLRj9DSdIz411YCjyFA97BUWVnFgB4A/bt t+VuU4633Nph/JnFNI9kJ/EGh7vy3Mim7IC6hrWIszIMFP/qYIjcCns2tc3e+Fe54mdo8sjYlSuqO uodx7Y9ZGFDQFwt6lyyYfCRP8qQwN83aBuimvIv2dxd64u4DHW/N2CympTXyasGGueVcbPCEPeybx GFVCTKpBv0IxAfC1H9Zw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nQBxg-00BQPE-6h; Fri, 04 Mar 2022 17:43:28 +0000 Received: from verein.lst.de ([213.95.11.211]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nQBxS-00BQK1-HR; Fri, 04 Mar 2022 17:43:15 +0000 Received: by verein.lst.de (Postfix, from userid 2407) id 18C7068BEB; Fri, 4 Mar 2022 18:43:09 +0100 (CET) Date: Fri, 4 Mar 2022 18:43:08 +0100 From: Christoph Hellwig To: Boris Ostrovsky Cc: Christoph Hellwig , Stefano Stabellini , iommu@lists.linux-foundation.org, x86@kernel.org, Anshuman Khandual , Tom Lendacky , Konrad Rzeszutek Wilk , Juergen Gross , Joerg Roedel , David Woodhouse , Lu Baolu , Robin Murphy , linux-arm-kernel@lists.infradead.org, xen-devel@lists.xenproject.org, linux-ia64@vger.kernel.org, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-hyperv@vger.kernel.org, tboot-devel@lists.sourceforge.net, linux-pci@vger.kernel.org Subject: Re: [PATCH 11/12] swiotlb: merge swiotlb-xen initialization into swiotlb Message-ID: <20220304174308.GA13515@lst.de> References: <20220301105311.885699-1-hch@lst.de> <20220301105311.885699-12-hch@lst.de> <20220304172859.GA12860@lst.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17 (2007-11-01) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220304_094314_739330_43057695 X-CRM114-Status: GOOD ( 16.79 ) 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 Fri, Mar 04, 2022 at 12:36:17PM -0500, Boris Ostrovsky wrote: >>> I bisected it to "x86: remove the IOMMU table infrastructure" but haven't actually looked at the code yet. >> That looks like the swiotlb buffer did not get initialized at all, but I >> can't really explain why. >> >> Can you stick in a printk and see if xen_swiotlb_init_early gets called >> at all? > > > > Actually, that's the only thing I did do so far and yes, it does get called. So, specifically for "x86: remove the IOMMU table infrastructure" I think we need the one-liner below so that swiotlb_exit doesn't get called for the Xen case. But that should have been fixed up by the next patch already. diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c index 2ac0ef9c2fb76..1173aa282ab27 100644 --- a/arch/x86/kernel/pci-dma.c +++ b/arch/x86/kernel/pci-dma.c @@ -70,7 +70,7 @@ static void __init pci_xen_swiotlb_init(void) if (!xen_initial_domain() && !x86_swiotlb_enable && swiotlb_force != SWIOTLB_FORCE) return; - x86_swiotlb_enable = false; + x86_swiotlb_enable = true; xen_swiotlb = true; xen_swiotlb_init_early(); dma_ops = &xen_swiotlb_dma_ops; _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv