From nobody Sun Feb 8 23:57:47 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=fail(p=none dis=none) header.from=arm.com Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1633542124765574.7376891263781; Wed, 6 Oct 2021 10:42:04 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.202989.358030 (Exim 4.92) (envelope-from ) id 1mYAvM-0004wo-PG; Wed, 06 Oct 2021 17:41:48 +0000 Received: by outflank-mailman (output) from mailman id 202989.358030; Wed, 06 Oct 2021 17:41:48 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1mYAvM-0004wh-L5; Wed, 06 Oct 2021 17:41:48 +0000 Received: by outflank-mailman (input) for mailman id 202989; Wed, 06 Oct 2021 17:41:47 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1mYAvL-0004w1-R7 for xen-devel@lists.xenproject.org; Wed, 06 Oct 2021 17:41:47 +0000 Received: from foss.arm.com (unknown [217.140.110.172]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTP id ad59c5ca-26cc-11ec-bf8b-12813bfff9fa; Wed, 06 Oct 2021 17:41:46 +0000 (UTC) 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 30DD1113E; Wed, 6 Oct 2021 10:41:46 -0700 (PDT) Received: from e109506.cambridge.arm.com (e109506.cambridge.arm.com [10.1.199.62]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 81D523F70D; Wed, 6 Oct 2021 10:41:44 -0700 (PDT) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: ad59c5ca-26cc-11ec-bf8b-12813bfff9fa From: Rahul Singh To: xen-devel@lists.xenproject.org Cc: bertrand.marquis@arm.com, rahul.singh@arm.com, Andre.Przywara@arm.com, Andrew Cooper , George Dunlap , Ian Jackson , Jan Beulich , Julien Grall , Stefano Stabellini , Wei Liu , Volodymyr Babchuk , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= Subject: [PATCH v5 03/11] xen/arm: Add cmdline boot option "pci-passthrough = " Date: Wed, 6 Oct 2021 18:40:29 +0100 Message-Id: X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZM-MESSAGEID: 1633542126821100001 Content-Type: text/plain; charset="utf-8" Add cmdline boot option "pci-passthrough =3D =3D " to enable or disable the PCI passthrough support on ARM. Signed-off-by: Rahul Singh Reviewed-by: Stefano Stabellini Reviewed-by: Bertrand Marquis Acked-by: Jan Beulich --- Change in v5: none Change in v4: - Fixe minor comments - Added Reviewed-by: Bertrand Marquis - Added Reviewed-by: Stefano Stabellini Change in v3: - Remove "define pci_passthrough_enabled (false)" - Fixed coding style and minor comment Change in v2: - Add option in xen-command-line.pandoc - Change pci option to pci-passthrough - modify option from custom_param to boolean param --- --- docs/misc/xen-command-line.pandoc | 7 +++++++ xen/arch/arm/pci/pci.c | 12 ++++++++++++ xen/drivers/pci/physdev.c | 6 ++++++ xen/include/asm-arm/pci.h | 11 +++++++++++ xen/include/asm-x86/pci.h | 6 ++++++ 5 files changed, 42 insertions(+) diff --git a/docs/misc/xen-command-line.pandoc b/docs/misc/xen-command-line= .pandoc index 5cae4adc58..b1f7978aa4 100644 --- a/docs/misc/xen-command-line.pandoc +++ b/docs/misc/xen-command-line.pandoc @@ -1819,6 +1819,13 @@ All numbers specified must be hexadecimal ones. =20 This option can be specified more than once (up to 8 times at present). =20 +### pci-passthrough (arm) +> `=3D ` + +> Default: `false` + +Flag to enable or disable support for PCI passthrough + ### pcid (x86) > `=3D | xpti=3D` =20 diff --git a/xen/arch/arm/pci/pci.c b/xen/arch/arm/pci/pci.c index e359bab9ea..73540045d1 100644 --- a/xen/arch/arm/pci/pci.c +++ b/xen/arch/arm/pci/pci.c @@ -16,6 +16,7 @@ #include #include #include +#include #include =20 /* @@ -62,8 +63,19 @@ static int __init acpi_pci_init(void) } #endif =20 +/* By default pci passthrough is disabled. */ +bool __read_mostly pci_passthrough_enabled; +boolean_param("pci-passthrough", pci_passthrough_enabled); + static int __init pci_init(void) { + /* + * Enable PCI passthrough when has been enabled explicitly + * (pci-passthrough=3Don). + */ + if ( !pci_passthrough_enabled ) + return 0; + pci_segments_init(); =20 if ( acpi_disabled ) diff --git a/xen/drivers/pci/physdev.c b/xen/drivers/pci/physdev.c index 4f3e1a96c0..42db3e6d13 100644 --- a/xen/drivers/pci/physdev.c +++ b/xen/drivers/pci/physdev.c @@ -18,6 +18,9 @@ ret_t pci_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void= ) arg) struct pci_dev_info pdev_info; nodeid_t node =3D NUMA_NO_NODE; =20 + if ( !is_pci_passthrough_enabled() ) + return -EOPNOTSUPP; + ret =3D -EFAULT; if ( copy_from_guest(&add, arg, 1) !=3D 0 ) break; @@ -53,6 +56,9 @@ ret_t pci_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void= ) arg) case PHYSDEVOP_pci_device_remove: { struct physdev_pci_device dev; =20 + if ( !is_pci_passthrough_enabled() ) + return -EOPNOTSUPP; + ret =3D -EFAULT; if ( copy_from_guest(&dev, arg, 1) !=3D 0 ) break; diff --git a/xen/include/asm-arm/pci.h b/xen/include/asm-arm/pci.h index 7dd9eb3dba..0cf849e26f 100644 --- a/xen/include/asm-arm/pci.h +++ b/xen/include/asm-arm/pci.h @@ -19,14 +19,25 @@ =20 #define pci_to_dev(pcidev) (&(pcidev)->arch.dev) =20 +extern bool_t pci_passthrough_enabled; + /* Arch pci dev struct */ struct arch_pci_dev { struct device dev; }; =20 +static always_inline bool is_pci_passthrough_enabled(void) +{ + return pci_passthrough_enabled; +} #else /*!CONFIG_HAS_PCI*/ =20 struct arch_pci_dev { }; =20 +static always_inline bool is_pci_passthrough_enabled(void) +{ + return false; +} + #endif /*!CONFIG_HAS_PCI*/ #endif /* __ARM_PCI_H__ */ diff --git a/xen/include/asm-x86/pci.h b/xen/include/asm-x86/pci.h index cc05045e9c..e076951032 100644 --- a/xen/include/asm-x86/pci.h +++ b/xen/include/asm-x86/pci.h @@ -32,4 +32,10 @@ bool_t pci_ro_mmcfg_decode(unsigned long mfn, unsigned i= nt *seg, extern int pci_mmcfg_config_num; extern struct acpi_mcfg_allocation *pci_mmcfg_config; =20 +/* Unlike ARM, PCI passthrough is always enabled for x86. */ +static always_inline bool is_pci_passthrough_enabled(void) +{ + return true; +} + #endif /* __X86_PCI_H__ */ --=20 2.25.1