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[2620:137:e000::1:20]) by mx.google.com with ESMTP id j14-20020a636e0e000000b0053424040bb7si6982790pgc.298.2023.06.12.08.25.57; Mon, 12 Jun 2023 08:26:11 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=bombadil.20210309 header.b="gi/Nxa/z"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238844AbjFLO2q (ORCPT + 99 others); Mon, 12 Jun 2023 10:28:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37870 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235781AbjFLO16 (ORCPT ); Mon, 12 Jun 2023 10:27:58 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:3::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 543664222 for ; Mon, 12 Jun 2023 07:26:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=xk7UcK2JitL8EW9ZuelDDstRDKvC7QWgJZaUJF9iY8U=; b=gi/Nxa/zQEPmiix7WWxiDcuGaQ UXWNUHjwEt1uV9G92Cki/tGyE4Fxl9h7Uw5/VW0QgnJaASa9uwWV+jTL1gGuqDpKpZSeQCnal1E5J qEv0DtE4DOdI2krZd7P/X4lJwG0qNpuqNQ/o25wL+x7eif+U1SXUWZb60We+k49zNk8r/rmi/Tl4E SoZuJ+wCJxNYD4SRNiAsgCiNftC3faUgZS/u0LJDBvs8x175TAWPm0lP2tjb4Cswk2u4xkFViVI4h PPfk9D+URfM35VS9Ur/NWziYDFfRS0b4rQtJX0lZUcaXERtO1ykJfsTkvpjcFifFd0gsamVHI2h6y NlYvrHJA==; Received: from 2a02-8389-2341-5b80-8c8c-28f8-1274-e038.cable.dynamic.v6.surfer.at ([2a02:8389:2341:5b80:8c8c:28f8:1274:e038] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1q8iUQ-004I8Z-1u; Mon, 12 Jun 2023 14:25:50 +0000 From: Christoph Hellwig To: Juergen Gross , Stefano Stabellini , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" Cc: xen-devel@lists.xenproject.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH 1/3] xen/pci: add flag for PCI passthrough being possible Date: Mon, 12 Jun 2023 16:25:40 +0200 Message-Id: <20230612142542.111581-2-hch@lst.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230612142542.111581-1-hch@lst.de> References: <20230612142542.111581-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-Spam-Status: No, score=-4.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_EF,HEADER_FROM_DIFFERENT_DOMAINS, RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1768511054733298140?= X-GMAIL-MSGID: =?utf-8?q?1768511054733298140?= From: Juergen Gross When running as a Xen PV guests passed through PCI devices only have a chance to work if the Xen supplied memory map has some PCI space reserved. Add a flag xen_pv_pci_possible which will be set in early boot in case the memory map has at least one area with the type E820_TYPE_RESERVED. Signed-off-by: Juergen Gross Signed-off-by: Christoph Hellwig --- arch/x86/xen/setup.c | 6 ++++++ include/xen/xen.h | 6 ++++++ 2 files changed, 12 insertions(+) diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c index c2be3efb2ba0fa..716f76c4141651 100644 --- a/arch/x86/xen/setup.c +++ b/arch/x86/xen/setup.c @@ -43,6 +43,9 @@ struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata; /* Number of pages released from the initial allocation. */ unsigned long xen_released_pages; +/* Memory map would allow PCI passthrough. */ +bool xen_pv_pci_possible; + /* E820 map used during setting up memory. */ static struct e820_table xen_e820_table __initdata; @@ -804,6 +807,9 @@ char * __init xen_memory_setup(void) chunk_size = size; type = xen_e820_table.entries[i].type; + if (type == E820_TYPE_RESERVED) + xen_pv_pci_possible = true; + if (type == E820_TYPE_RAM) { if (addr < mem_end) { chunk_size = min(size, mem_end - addr); diff --git a/include/xen/xen.h b/include/xen/xen.h index 0efeb652f9b8fb..5eb0a974a11e7e 100644 --- a/include/xen/xen.h +++ b/include/xen/xen.h @@ -29,6 +29,12 @@ extern bool xen_pvh; extern uint32_t xen_start_flags; +#ifdef CONFIG_XEN_PV +extern bool xen_pv_pci_possible; +#else +#define xen_pv_pci_possible 0 +#endif + #include extern struct hvm_start_info pvh_start_info; From patchwork Mon Jun 12 14:25:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 106658 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:994d:0:b0:3d9:f83d:47d9 with SMTP id k13csp2640508vqr; Mon, 12 Jun 2023 07:48:21 -0700 (PDT) X-Google-Smtp-Source: ACHHUZ5ZGug5f7gL6s4WcOCUQXH19oi6Gm35UqHGE1hCjAq7Bxrh9eZAiKua2EkEYctWl466ogmJ X-Received: by 2002:a17:907:1c03:b0:96f:32ae:a7e1 with SMTP id nc3-20020a1709071c0300b0096f32aea7e1mr9989836ejc.63.1686581301616; Mon, 12 Jun 2023 07:48:21 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1686581301; cv=none; d=google.com; s=arc-20160816; b=x031T7dzDTrsUeKoKspeCh2nmEz7CMTvKhMQxJRzBppLwSmvTimkAcrSkk9tWNqOso XXMfqoWJ0QfqtPJ3ApXEK8uFkKWEU71RZiHE2zbfMutRJtF/JSemF/1rD8TVIzPiNdZw KR0cRAlwjdSZl8WBchOWpObDMEsk1FKXsCyd8BbcdDSscNGvqHJaVNtdUSIn3N23d2pq z4c18FVRJ062G9WCG7T8QHW1pMVF+uACAV+/PYR/AB5FUVofsUVpgQ5U1gXmIaXiM2lN OcbpBQFgOxJSP783g5Il91kumJOpWKKmvbam1A0zfPmE0ppC8I4+krsIWjW4h52wPZf2 Hbzw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=Do07+ZJ8mt79MyKnagn3FmtuEPVS6qLM8Uvv604VtrU=; b=NC8fn8x+tKBfCGSXqNjho7Ar+QbYEPhYNUBHqq11kHgT3tnGF7Y+iHL65QIpkU87N/ RAYl1sMZt/ym1OY6bwQ5JqUqpfVS/IZwQ1uyohwCJQeLKssxHnDXCtsHcUr75tE709bE x9GtEVALa0hM8ix6XPBDrWeXb9weWBRzOLu07NhrDnVgfbQu1A3oJnKZcjfudwiy6ZRY DayKpMxQkRVgCHEzdrzba6WS53Qz3JsRpW8y1QJJNG88QG/LvmoXqoqTu35YRvkf/a75 MuYbuojoNgy3hitb9ETFK4V3v7r7MN8vXpxeN3mG0duApd7Xz75X2jzt1ji52+03/vQy pnSQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=bombadil.20210309 header.b=ft+LfENS; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: from out1.vger.email (out1.vger.email. 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Peter Anvin" Cc: xen-devel@lists.xenproject.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH 2/3] x86: always initialize xen-swiotlb when xen-pcifront is enabling Date: Mon, 12 Jun 2023 16:25:41 +0200 Message-Id: <20230612142542.111581-3-hch@lst.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230612142542.111581-1-hch@lst.de> References: <20230612142542.111581-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-Spam-Status: No, score=-4.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_EF,HEADER_FROM_DIFFERENT_DOMAINS, RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1768508674900703332?= X-GMAIL-MSGID: =?utf-8?q?1768508674900703332?= Remove the dangerous late initialization of xen-swiotlb in pci_xen_swiotlb_init_late and instead just always initialize xen-swiotlb in the boot code if CONFIG_XEN_PCIDEV_FRONTEND is enabled and Xen PV PCI is possible. Signed-off-by: Christoph Hellwig Reviewed-by: Juergen Gross --- arch/x86/include/asm/xen/swiotlb-xen.h | 6 ------ arch/x86/kernel/pci-dma.c | 29 +++++++------------------- drivers/pci/xen-pcifront.c | 6 ------ 3 files changed, 7 insertions(+), 34 deletions(-) diff --git a/arch/x86/include/asm/xen/swiotlb-xen.h b/arch/x86/include/asm/xen/swiotlb-xen.h index 77a2d19cc9909e..abde0f44df57dc 100644 --- a/arch/x86/include/asm/xen/swiotlb-xen.h +++ b/arch/x86/include/asm/xen/swiotlb-xen.h @@ -2,12 +2,6 @@ #ifndef _ASM_X86_SWIOTLB_XEN_H #define _ASM_X86_SWIOTLB_XEN_H -#ifdef CONFIG_SWIOTLB_XEN -extern int pci_xen_swiotlb_init_late(void); -#else -static inline int pci_xen_swiotlb_init_late(void) { return -ENXIO; } -#endif - int xen_swiotlb_fixup(void *buf, unsigned long nslabs); int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order, unsigned int address_bits, diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c index de6be0a3965ee4..f323d83e40a70b 100644 --- a/arch/x86/kernel/pci-dma.c +++ b/arch/x86/kernel/pci-dma.c @@ -72,9 +72,15 @@ static inline void __init pci_swiotlb_detect(void) #endif /* CONFIG_SWIOTLB */ #ifdef CONFIG_SWIOTLB_XEN +static bool xen_swiotlb_enabled(void) +{ + return xen_initial_domain() || x86_swiotlb_enable || + (IS_ENABLED(CONFIG_XEN_PCIDEV_FRONTEND) && xen_pv_pci_possible); +} + static void __init pci_xen_swiotlb_init(void) { - if (!xen_initial_domain() && !x86_swiotlb_enable) + if (!xen_swiotlb_enabled()) return; x86_swiotlb_enable = true; x86_swiotlb_flags |= SWIOTLB_ANY; @@ -83,27 +89,6 @@ static void __init pci_xen_swiotlb_init(void) if (IS_ENABLED(CONFIG_PCI)) pci_request_acs(); } - -int pci_xen_swiotlb_init_late(void) -{ - if (dma_ops == &xen_swiotlb_dma_ops) - return 0; - - /* we can work with the default swiotlb */ - if (!io_tlb_default_mem.nslabs) { - int rc = swiotlb_init_late(swiotlb_size_or_default(), - GFP_KERNEL, xen_swiotlb_fixup); - if (rc < 0) - return rc; - } - - /* XXX: this switches the dma ops under live devices! */ - dma_ops = &xen_swiotlb_dma_ops; - if (IS_ENABLED(CONFIG_PCI)) - pci_request_acs(); - return 0; -} -EXPORT_SYMBOL_GPL(pci_xen_swiotlb_init_late); #else static inline void __init pci_xen_swiotlb_init(void) { diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c index 83c0ab50676dff..11636634ae512f 100644 --- a/drivers/pci/xen-pcifront.c +++ b/drivers/pci/xen-pcifront.c @@ -22,7 +22,6 @@ #include #include #include -#include #include #include @@ -669,11 +668,6 @@ static int pcifront_connect_and_init_dma(struct pcifront_device *pdev) spin_unlock(&pcifront_dev_lock); - if (!err && !is_swiotlb_active(&pdev->xdev->dev)) { - err = pci_xen_swiotlb_init_late(); - if (err) - dev_err(&pdev->xdev->dev, "Could not setup SWIOTLB!\n"); - } return err; } From patchwork Mon Jun 12 14:25:42 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 106659 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:994d:0:b0:3d9:f83d:47d9 with SMTP id k13csp2641239vqr; Mon, 12 Jun 2023 07:49:42 -0700 (PDT) X-Google-Smtp-Source: ACHHUZ5zNXtYeTTYypudU9SV6XnN50zoKc99NGe499N1BHBcKvRZleVREZocP1lZ/DHmtTpEeqrO X-Received: by 2002:a17:907:6d81:b0:978:88bc:f232 with SMTP id sb1-20020a1709076d8100b0097888bcf232mr9010749ejc.13.1686581382035; Mon, 12 Jun 2023 07:49:42 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1686581382; cv=none; d=google.com; s=arc-20160816; b=Gjq9Nv9KeC3Fxcf98BiMX0yqt/KOXq8QPCjDsc2zvIwyTzvNakSbDQvN5PqOXb1uZ+ 1tfUY9xvGKGQ+MO1Lr9M82OvUAu5CBc02Yz1k54bu+4d5UeDf9wxyP/GT2uPRu/BS8gk NS7kpfsf26lYaTnv6f8KflKE9pD5wUb0ZEyRYhAo6pZYUBkzMGriSG5FbTmySilnwISA RFPy7mzPtsgmAwrGjf72SjJ+yoKHwpxfjT6bEBJc9qB7Iy7ZZixSSK8iCvOQIQ4RKlqW vSgNr8qtrGjE+VghD6y007C+0i4SdWC2Ei/+Hb4SbKydO3NSiks8wXHtYG/wYZCOXZxX HG4Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=7+xegEsHtqdZfD90PqdQG2V9qml0A9VagIuPc+XndpY=; b=DmXAAbL9e49M1XTAHVohp0ZQ7zLGOROHgRuNOiWbk1FS7a6e96RI1apuN2ZQUwYHj3 Ck0QWWoT6YXihTJmIhuZvFtFIOw1r8ydWLKM+bXoFg1lu4OOUV1dsB/FX7ggvy1uXsYY cNDXcfwdY33UXpiRbnk6AVTv8Q7aIow+cw1Z4I7GH46pUTqTqCgYSSAz0qwKGLPJ7rP0 mbDLI8HbLPYuMRapToTlX3rlZrpQK8K/dVU13YEpd3YjOOE0YmUukUamyr6dKhrC0ltR NrmkBa8MqsFIQ054DkYLND725/5sLeFyWjh816h7Qg8njnVLe1PxvhTOm9vxj3NGC0xb ae6g== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=bombadil.20210309 header.b=nOfGMv5B; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: from out1.vger.email (out1.vger.email. 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Peter Anvin" Cc: xen-devel@lists.xenproject.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH 3/3] swiotlb: unexport is_swiotlb_active Date: Mon, 12 Jun 2023 16:25:42 +0200 Message-Id: <20230612142542.111581-4-hch@lst.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230612142542.111581-1-hch@lst.de> References: <20230612142542.111581-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-Spam-Status: No, score=-4.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_EF,HEADER_FROM_DIFFERENT_DOMAINS, RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1768508759052381178?= X-GMAIL-MSGID: =?utf-8?q?1768508759052381178?= Drivers have no business looking at dma-mapping or swiotlb internals. Signed-off-by: Christoph Hellwig Reviewed-by: Juergen Gross --- kernel/dma/swiotlb.c | 1 - 1 file changed, 1 deletion(-) diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index 775f7bb10ab184..1891faa3a6952e 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -932,7 +932,6 @@ bool is_swiotlb_active(struct device *dev) return mem && mem->nslabs; } -EXPORT_SYMBOL_GPL(is_swiotlb_active); #ifdef CONFIG_DEBUG_FS