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Wed, 27 Oct 2021 23:13:44 -0700 (PDT) From: Oleksandr Andrushchenko To: xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org Cc: boris.ostrovsky@oracle.com, jgross@suse.com, julien@xen.org, sstabellini@kernel.org, jbeulich@suse.com, Oleksandr Andrushchenko , Anastasiia Lukianenko Subject: [PATCH] xen-pciback: allow compiling on other archs than x86 Date: Thu, 28 Oct 2021 09:13:41 +0300 Message-Id: <20211028061341.1479333-1-andr2000@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1635401658674100001 Content-Type: text/plain; charset="utf-8" From: Oleksandr Andrushchenko Xen-pciback driver was designed to be built for x86 only. But it can also be used by other architectures, e.g. Arm. Currently PCI backend implements multiple functionalities at a time, such as: 1. It is used as a database for assignable PCI devices, e.g. xl pci-assignable-{add|remove|list} manipulates that list. So, whenever the toolstack needs to know which PCI devices can be passed through it reads that from the relevant sysfs entries of the pciback. 2. It is used to hold the unbound PCI devices list, e.g. when passing through a PCI device it needs to be unbound from the relevant device driver and bound to pciback (strictly speaking it is not required that the device is bound to pciback, but pciback is again used as a database of the passed through PCI devices, so we can re-bind the devices back to their original drivers when guest domain shuts down) 3. Device reset for the devices being passed through 4. Para-virtualised use-cases support The para-virtualised part of the driver is not always needed as some architectures, e.g. Arm or x86 PVH Dom0, are not using backend-frontend model for PCI device passthrough. For such use-cases make the very first step in splitting the xen-pciback driver into two parts: Xen PCI stub and PCI PV backend drivers. For that add new configuration options CONFIG_XEN_PCI_STUB and CONFIG_XEN_PCIDEV_STUB, so the driver can be limited in its functionality, e.g. no support for para-virtualised scenario. x86 platform will continue using CONFIG_XEN_PCIDEV_BACKEND for the fully featured backend driver. Signed-off-by: Oleksandr Andrushchenko Signed-off-by: Anastasiia Lukianenko Reviewed-by: Stefano Stabellini Reviewed-by: Juergen Gross Reported-by: kernel test robot --- Changes since v5: - rebased Changes since v4: - squashed two patches - simplified Makefile Changes since v3: - Fix >>32 shift for 32-bit architectures Changes since v2: - swap the patch order Since v1: - Do not move pci_xen_initial_domain as it is x86 specific --- arch/x86/include/asm/xen/pci.h | 19 ------ arch/x86/pci/xen.c | 76 +-------------------- drivers/xen/Kconfig | 24 +++++++ drivers/xen/Makefile | 2 +- drivers/xen/pci.c | 75 ++++++++++++++++++++ drivers/xen/xen-pciback/Makefile | 7 ++ drivers/xen/xen-pciback/conf_space_header.c | 8 ++- drivers/xen/xen-pciback/pci_stub.c | 3 +- drivers/xen/xen-pciback/pciback.h | 5 ++ drivers/xen/xen-pciback/xenbus.c | 8 ++- include/xen/pci.h | 28 ++++++++ 11 files changed, 155 insertions(+), 100 deletions(-) create mode 100644 include/xen/pci.h diff --git a/arch/x86/include/asm/xen/pci.h b/arch/x86/include/asm/xen/pci.h index 4557f7cb0fa6..9015b888edd6 100644 --- a/arch/x86/include/asm/xen/pci.h +++ b/arch/x86/include/asm/xen/pci.h @@ -22,25 +22,6 @@ static inline int __init pci_xen_initial_domain(void) return -1; } #endif -#ifdef CONFIG_XEN_DOM0 -int xen_find_device_domain_owner(struct pci_dev *dev); -int xen_register_device_domain_owner(struct pci_dev *dev, uint16_t domain); -int xen_unregister_device_domain_owner(struct pci_dev *dev); -#else -static inline int xen_find_device_domain_owner(struct pci_dev *dev) -{ - return -1; -} -static inline int xen_register_device_domain_owner(struct pci_dev *dev, - uint16_t domain) -{ - return -1; -} -static inline int xen_unregister_device_domain_owner(struct pci_dev *dev) -{ - return -1; -} -#endif =20 #if defined(CONFIG_PCI_MSI) #if defined(CONFIG_PCI_XEN) diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c index 5debe4ac6f81..12da00558631 100644 --- a/arch/x86/pci/xen.c +++ b/arch/x86/pci/xen.c @@ -23,6 +23,7 @@ =20 #include #include +#include #include #include #include @@ -585,78 +586,3 @@ int __init pci_xen_initial_domain(void) } #endif =20 -#ifdef CONFIG_XEN_DOM0 - -struct xen_device_domain_owner { - domid_t domain; - struct pci_dev *dev; - struct list_head list; -}; - -static DEFINE_SPINLOCK(dev_domain_list_spinlock); -static struct list_head dev_domain_list =3D LIST_HEAD_INIT(dev_domain_list= ); - -static struct xen_device_domain_owner *find_device(struct pci_dev *dev) -{ - struct xen_device_domain_owner *owner; - - list_for_each_entry(owner, &dev_domain_list, list) { - if (owner->dev =3D=3D dev) - return owner; - } - return NULL; -} - -int xen_find_device_domain_owner(struct pci_dev *dev) -{ - struct xen_device_domain_owner *owner; - int domain =3D -ENODEV; - - spin_lock(&dev_domain_list_spinlock); - owner =3D find_device(dev); - if (owner) - domain =3D owner->domain; - spin_unlock(&dev_domain_list_spinlock); - return domain; -} -EXPORT_SYMBOL_GPL(xen_find_device_domain_owner); - -int xen_register_device_domain_owner(struct pci_dev *dev, uint16_t domain) -{ - struct xen_device_domain_owner *owner; - - owner =3D kzalloc(sizeof(struct xen_device_domain_owner), GFP_KERNEL); - if (!owner) - return -ENODEV; - - spin_lock(&dev_domain_list_spinlock); - if (find_device(dev)) { - spin_unlock(&dev_domain_list_spinlock); - kfree(owner); - return -EEXIST; - } - owner->domain =3D domain; - owner->dev =3D dev; - list_add_tail(&owner->list, &dev_domain_list); - spin_unlock(&dev_domain_list_spinlock); - return 0; -} -EXPORT_SYMBOL_GPL(xen_register_device_domain_owner); - -int xen_unregister_device_domain_owner(struct pci_dev *dev) -{ - struct xen_device_domain_owner *owner; - - spin_lock(&dev_domain_list_spinlock); - owner =3D find_device(dev); - if (!owner) { - spin_unlock(&dev_domain_list_spinlock); - return -ENODEV; - } - list_del(&owner->list); - spin_unlock(&dev_domain_list_spinlock); - kfree(owner); - return 0; -} -EXPORT_SYMBOL_GPL(xen_unregister_device_domain_owner); -#endif /* CONFIG_XEN_DOM0 */ diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig index 1b2c3aca6887..a1b11c62da9e 100644 --- a/drivers/xen/Kconfig +++ b/drivers/xen/Kconfig @@ -181,10 +181,34 @@ config SWIOTLB_XEN select DMA_OPS select SWIOTLB =20 +config XEN_PCI_STUB + bool + +config XEN_PCIDEV_STUB + tristate "Xen PCI-device stub driver" + depends on PCI && !X86 && XEN + depends on XEN_BACKEND + select XEN_PCI_STUB + default m + help + The PCI device stub driver provides limited version of the PCI + device backend driver without para-virtualized support for guests. + If you select this to be a module, you will need to make sure no + other driver has bound to the device(s) you want to make visible to + other guests. + + The "hide" parameter (only applicable if backend driver is compiled + into the kernel) allows you to bind the PCI devices to this module + from the default device drivers. The argument is the list of PCI BDFs: + xen-pciback.hide=3D(03:00.0)(04:00.0) + + If in doubt, say m. + config XEN_PCIDEV_BACKEND tristate "Xen PCI-device backend driver" depends on PCI && X86 && XEN depends on XEN_BACKEND + select XEN_PCI_STUB default m help The PCI device backend driver allows the kernel to export arbitrary diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile index 3434593455b2..5aae66e638a7 100644 --- a/drivers/xen/Makefile +++ b/drivers/xen/Makefile @@ -24,7 +24,7 @@ obj-$(CONFIG_XEN_SYS_HYPERVISOR) +=3D sys-hypervisor.o obj-$(CONFIG_XEN_PVHVM_GUEST) +=3D platform-pci.o obj-$(CONFIG_SWIOTLB_XEN) +=3D swiotlb-xen.o obj-$(CONFIG_XEN_MCE_LOG) +=3D mcelog.o -obj-$(CONFIG_XEN_PCIDEV_BACKEND) +=3D xen-pciback/ +obj-$(CONFIG_XEN_PCI_STUB) +=3D xen-pciback/ obj-$(CONFIG_XEN_PRIVCMD) +=3D xen-privcmd.o obj-$(CONFIG_XEN_ACPI_PROCESSOR) +=3D xen-acpi-processor.o obj-$(CONFIG_XEN_EFI) +=3D efi.o diff --git a/drivers/xen/pci.c b/drivers/xen/pci.c index 224df03ce42e..fc8c1249d49f 100644 --- a/drivers/xen/pci.c +++ b/drivers/xen/pci.c @@ -254,3 +254,78 @@ static int xen_mcfg_late(void) return 0; } #endif + +#ifdef CONFIG_XEN_DOM0 +struct xen_device_domain_owner { + domid_t domain; + struct pci_dev *dev; + struct list_head list; +}; + +static DEFINE_SPINLOCK(dev_domain_list_spinlock); +static struct list_head dev_domain_list =3D LIST_HEAD_INIT(dev_domain_list= ); + +static struct xen_device_domain_owner *find_device(struct pci_dev *dev) +{ + struct xen_device_domain_owner *owner; + + list_for_each_entry(owner, &dev_domain_list, list) { + if (owner->dev =3D=3D dev) + return owner; + } + return NULL; +} + +int xen_find_device_domain_owner(struct pci_dev *dev) +{ + struct xen_device_domain_owner *owner; + int domain =3D -ENODEV; + + spin_lock(&dev_domain_list_spinlock); + owner =3D find_device(dev); + if (owner) + domain =3D owner->domain; + spin_unlock(&dev_domain_list_spinlock); + return domain; +} +EXPORT_SYMBOL_GPL(xen_find_device_domain_owner); + +int xen_register_device_domain_owner(struct pci_dev *dev, uint16_t domain) +{ + struct xen_device_domain_owner *owner; + + owner =3D kzalloc(sizeof(struct xen_device_domain_owner), GFP_KERNEL); + if (!owner) + return -ENODEV; + + spin_lock(&dev_domain_list_spinlock); + if (find_device(dev)) { + spin_unlock(&dev_domain_list_spinlock); + kfree(owner); + return -EEXIST; + } + owner->domain =3D domain; + owner->dev =3D dev; + list_add_tail(&owner->list, &dev_domain_list); + spin_unlock(&dev_domain_list_spinlock); + return 0; +} +EXPORT_SYMBOL_GPL(xen_register_device_domain_owner); + +int xen_unregister_device_domain_owner(struct pci_dev *dev) +{ + struct xen_device_domain_owner *owner; + + spin_lock(&dev_domain_list_spinlock); + owner =3D find_device(dev); + if (!owner) { + spin_unlock(&dev_domain_list_spinlock); + return -ENODEV; + } + list_del(&owner->list); + spin_unlock(&dev_domain_list_spinlock); + kfree(owner); + return 0; +} +EXPORT_SYMBOL_GPL(xen_unregister_device_domain_owner); +#endif diff --git a/drivers/xen/xen-pciback/Makefile b/drivers/xen/xen-pciback/Mak= efile index e8d981d43235..d63df09de81c 100644 --- a/drivers/xen/xen-pciback/Makefile +++ b/drivers/xen/xen-pciback/Makefile @@ -1,5 +1,12 @@ # SPDX-License-Identifier: GPL-2.0 + +# N.B. The below cannot be expressed with a single line using +# CONFIG_XEN_PCI_STUB as it always remains in "y" state, +# thus preventing the driver to be built as a module. +# Please note, that CONFIG_XEN_PCIDEV_BACKEND and +# CONFIG_XEN_PCIDEV_STUB are mutually exclusive. obj-$(CONFIG_XEN_PCIDEV_BACKEND) +=3D xen-pciback.o +obj-$(CONFIG_XEN_PCIDEV_STUB) +=3D xen-pciback.o =20 xen-pciback-y :=3D pci_stub.o pciback_ops.o xenbus.o xen-pciback-y +=3D conf_space.o conf_space_header.o \ diff --git a/drivers/xen/xen-pciback/conf_space_header.c b/drivers/xen/xen-= pciback/conf_space_header.c index ac45cdc38e85..981435103af1 100644 --- a/drivers/xen/xen-pciback/conf_space_header.c +++ b/drivers/xen/xen-pciback/conf_space_header.c @@ -236,8 +236,12 @@ static void *bar_init(struct pci_dev *dev, int offset) else { pos =3D (offset - PCI_BASE_ADDRESS_0) / 4; if (pos && (res[pos - 1].flags & IORESOURCE_MEM_64)) { - bar->val =3D res[pos - 1].start >> 32; - bar->len_val =3D -resource_size(&res[pos - 1]) >> 32; + /* + * Use ">> 16 >> 16" instead of direct ">> 32" shift + * to avoid warnings on 32-bit architectures. + */ + bar->val =3D res[pos - 1].start >> 16 >> 16; + bar->len_val =3D -resource_size(&res[pos - 1]) >> 16 >> 16; return bar; } } diff --git a/drivers/xen/xen-pciback/pci_stub.c b/drivers/xen/xen-pciback/p= ci_stub.c index f8e4faa96ad6..bba527620507 100644 --- a/drivers/xen/xen-pciback/pci_stub.c +++ b/drivers/xen/xen-pciback/pci_stub.c @@ -19,7 +19,8 @@ #include #include #include -#include +#include +#include #include #include #include "pciback.h" diff --git a/drivers/xen/xen-pciback/pciback.h b/drivers/xen/xen-pciback/pc= iback.h index 95e28ee48d52..9a64196e831d 100644 --- a/drivers/xen/xen-pciback/pciback.h +++ b/drivers/xen/xen-pciback/pciback.h @@ -71,6 +71,11 @@ struct pci_dev *pcistub_get_pci_dev(struct xen_pcibk_dev= ice *pdev, struct pci_dev *dev); void pcistub_put_pci_dev(struct pci_dev *dev); =20 +static inline bool xen_pcibk_pv_support(void) +{ + return IS_ENABLED(CONFIG_XEN_PCIDEV_BACKEND); +} + /* Ensure a device is turned off or reset */ void xen_pcibk_reset_device(struct pci_dev *pdev); =20 diff --git a/drivers/xen/xen-pciback/xenbus.c b/drivers/xen/xen-pciback/xen= bus.c index c09c7ebd6968..bde63ef677b8 100644 --- a/drivers/xen/xen-pciback/xenbus.c +++ b/drivers/xen/xen-pciback/xenbus.c @@ -14,7 +14,7 @@ #include #include #include -#include +#include #include "pciback.h" =20 #define INVALID_EVTCHN_IRQ (-1) @@ -743,6 +743,9 @@ const struct xen_pcibk_backend *__read_mostly xen_pcibk= _backend; =20 int __init xen_pcibk_xenbus_register(void) { + if (!xen_pcibk_pv_support()) + return 0; + xen_pcibk_backend =3D &xen_pcibk_vpci_backend; if (passthrough) xen_pcibk_backend =3D &xen_pcibk_passthrough_backend; @@ -752,5 +755,6 @@ int __init xen_pcibk_xenbus_register(void) =20 void __exit xen_pcibk_xenbus_unregister(void) { - xenbus_unregister_driver(&xen_pcibk_driver); + if (xen_pcibk_pv_support()) + xenbus_unregister_driver(&xen_pcibk_driver); } diff --git a/include/xen/pci.h b/include/xen/pci.h new file mode 100644 index 000000000000..b8337cf85fd1 --- /dev/null +++ b/include/xen/pci.h @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef __XEN_PCI_H__ +#define __XEN_PCI_H__ + +#if defined(CONFIG_XEN_DOM0) +int xen_find_device_domain_owner(struct pci_dev *dev); +int xen_register_device_domain_owner(struct pci_dev *dev, uint16_t domain); +int xen_unregister_device_domain_owner(struct pci_dev *dev); +#else +static inline int xen_find_device_domain_owner(struct pci_dev *dev) +{ + return -1; +} + +static inline int xen_register_device_domain_owner(struct pci_dev *dev, + uint16_t domain) +{ + return -1; +} + +static inline int xen_unregister_device_domain_owner(struct pci_dev *dev) +{ + return -1; +} +#endif + +#endif --=20 2.25.1