From patchwork Thu Aug 5 00:52:14 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuppuswamy Sathyanarayanan X-Patchwork-Id: 12420001 X-Patchwork-Delegate: bhelgaas@google.com 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 DDC8DC43216 for ; Thu, 5 Aug 2021 00:54:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B96A86104F for ; Thu, 5 Aug 2021 00:54:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236633AbhHEAyX (ORCPT ); Wed, 4 Aug 2021 20:54:23 -0400 Received: from mga09.intel.com ([134.134.136.24]:27477 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236905AbhHEAyH (ORCPT ); Wed, 4 Aug 2021 20:54:07 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10066"; a="214027483" X-IronPort-AV: E=Sophos;i="5.84,296,1620716400"; d="scan'208";a="214027483" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Aug 2021 17:53:45 -0700 X-IronPort-AV: E=Sophos;i="5.84,296,1620716400"; d="scan'208";a="437617274" Received: from mjkendri-mobl.amr.corp.intel.com (HELO skuppusw-desk1.amr.corp.intel.com) ([10.254.17.117]) by orsmga002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Aug 2021 17:53:42 -0700 From: Kuppuswamy Sathyanarayanan To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Peter Zijlstra , Andy Lutomirski , Bjorn Helgaas , Richard Henderson , Thomas Bogendoerfer , James E J Bottomley , Helge Deller , "David S . Miller" , Arnd Bergmann , Jonathan Corbet , "Michael S . Tsirkin" Cc: Peter H Anvin , Dave Hansen , Tony Luck , Dan Williams , Andi Kleen , Kirill Shutemov , Sean Christopherson , Kuppuswamy Sathyanarayanan , x86@kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-alpha@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, sparclinux@vger.kernel.org, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, virtualization@lists.linux-foundation.org Subject: [PATCH v4 11/15] pci: Add pci_iomap_shared{,_range} Date: Wed, 4 Aug 2021 17:52:14 -0700 Message-Id: <20210805005218.2912076-12-sathyanarayanan.kuppuswamy@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210805005218.2912076-1-sathyanarayanan.kuppuswamy@linux.intel.com> References: <20210805005218.2912076-1-sathyanarayanan.kuppuswamy@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Andi Kleen Add a new variant of pci_iomap for mapping all PCI resources of a devices as shared memory with a hypervisor in a confidential guest. Signed-off-by: Andi Kleen Signed-off-by: Kuppuswamy Sathyanarayanan --- include/asm-generic/pci_iomap.h | 6 +++++ lib/pci_iomap.c | 46 +++++++++++++++++++++++++++++++++ 2 files changed, 52 insertions(+) diff --git a/include/asm-generic/pci_iomap.h b/include/asm-generic/pci_iomap.h index d4f16dcc2ed7..0178ddd7ad88 100644 --- a/include/asm-generic/pci_iomap.h +++ b/include/asm-generic/pci_iomap.h @@ -18,6 +18,12 @@ extern void __iomem *pci_iomap_range(struct pci_dev *dev, int bar, extern void __iomem *pci_iomap_wc_range(struct pci_dev *dev, int bar, unsigned long offset, unsigned long maxlen); +extern void __iomem *pci_iomap_shared(struct pci_dev *dev, int bar, + unsigned long max); +extern void __iomem *pci_iomap_shared_range(struct pci_dev *dev, int bar, + unsigned long offset, + unsigned long maxlen); + /* Create a virtual mapping cookie for a port on a given PCI device. * Do not call this directly, it exists to make it easier for architectures * to override */ diff --git a/lib/pci_iomap.c b/lib/pci_iomap.c index 6251c3f651c6..b04e8689eab3 100644 --- a/lib/pci_iomap.c +++ b/lib/pci_iomap.c @@ -25,6 +25,11 @@ static void __iomem *map_ioremap_wc(phys_addr_t addr, size_t size) return ioremap_wc(addr, size); } +static void __iomem *map_ioremap_shared(phys_addr_t addr, size_t size) +{ + return ioremap_shared(addr, size); +} + static void __iomem *pci_iomap_range_map(struct pci_dev *dev, int bar, unsigned long offset, @@ -101,6 +106,47 @@ void __iomem *pci_iomap_wc_range(struct pci_dev *dev, } EXPORT_SYMBOL_GPL(pci_iomap_wc_range); +/** + * pci_iomap_shared_range - create a virtual shared mapping cookie for a + * PCI BAR + * @dev: PCI device that owns the BAR + * @bar: BAR number + * @offset: map memory at the given offset in BAR + * @maxlen: max length of the memory to map + * + * Remap a pci device's resources shared in a confidential guest. + * For more details see pci_iomap_range's documentation. + * + * @maxlen specifies the maximum length to map. To get access to + * the complete BAR from offset to the end, pass %0 here. + */ +void __iomem *pci_iomap_shared_range(struct pci_dev *dev, int bar, + unsigned long offset, unsigned long maxlen) +{ + return pci_iomap_range_map(dev, bar, offset, maxlen, + map_ioremap_shared); +} +EXPORT_SYMBOL_GPL(pci_iomap_shared_range); + +/** + * pci_iomap_shared - create a virtual shared mapping cookie for a PCI BAR + * @dev: PCI device that owns the BAR + * @bar: BAR number + * @maxlen: length of the memory to map + * + * See pci_iomap for details. This function creates a shared mapping + * with the host for confidential hosts. + * + * @maxlen specifies the maximum length to map. To get access to the + * complete BAR without checking for its length first, pass %0 here. + */ +void __iomem *pci_iomap_shared(struct pci_dev *dev, int bar, + unsigned long maxlen) +{ + return pci_iomap_shared_range(dev, bar, 0, maxlen); +} +EXPORT_SYMBOL_GPL(pci_iomap_shared); + /** * pci_iomap - create a virtual mapping cookie for a PCI BAR * @dev: PCI device that owns the BAR