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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Oct 2024 03:43:18.3293 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 644d0b3d-81bf-4d68-c85f-08dce9a6d872 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DS2PEPF00003442.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB7758 X-ZohoMail-DKIM: pass (identity @amd.com) X-ZM-MESSAGEID: 1728618237450116600 Commit 2fae6bb7be32 ("xen/privcmd: Add new syscall to get gsi from dev") adds a weak reverse dependency to the config XEN_PRIVCMD definition, that dependency causes xen-privcmd can't be loaded on domU, because dependent xen-pciback isn't always be loaded successfully on domU. To solve above problem, remove that dependency, and do not call pcistub_get_gsi_from_sbdf() directly, instead add a hook in drivers/xen/apci.c, xen-pciback register the real call function, then in privcmd_ioctl_pcidev_get_gsi call that hook. Fixes: 2fae6bb7be32 ("xen/privcmd: Add new syscall to get gsi from dev") Reported-by: Marek Marczykowski-G=C3=B3recki Signed-off-by: Jiqian Chen Reviewed-by: Juergen Gross --- v2->v3 changes: Added rwlock get_gsi_from_sbdf_lock to avoid races. Called xen_acpi_register_get_gsi_func to register function in xen_pcibk_ini= t and set NULL to hook in xen_pcibk_cleanup when unloading. v1->v2 changes: Added hook xen_acpi_get_gsi_from_sbdf. Changed pcistub_get_gsi_from_sbdf to static and pciback register it as the = real hook function. --- drivers/xen/Kconfig | 1 - drivers/xen/acpi.c | 24 ++++++++++++++++++++++++ drivers/xen/privcmd.c | 6 ++---- drivers/xen/xen-pciback/pci_stub.c | 11 +++++++++-- include/xen/acpi.h | 12 ++++-------- 5 files changed, 39 insertions(+), 15 deletions(-) diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig index 72ddee4c1544..f7d6f47971fd 100644 --- a/drivers/xen/Kconfig +++ b/drivers/xen/Kconfig @@ -261,7 +261,6 @@ config XEN_SCSI_BACKEND config XEN_PRIVCMD tristate "Xen hypercall passthrough driver" depends on XEN - imply XEN_PCIDEV_BACKEND default m help The hypercall passthrough driver allows privileged user programs to diff --git a/drivers/xen/acpi.c b/drivers/xen/acpi.c index 9e2096524fbc..d2ee605c5ca1 100644 --- a/drivers/xen/acpi.c +++ b/drivers/xen/acpi.c @@ -125,3 +125,27 @@ int xen_acpi_get_gsi_info(struct pci_dev *dev, return 0; } EXPORT_SYMBOL_GPL(xen_acpi_get_gsi_info); + +static get_gsi_from_sbdf_t get_gsi_from_sbdf; +static DEFINE_RWLOCK(get_gsi_from_sbdf_lock); + +void xen_acpi_register_get_gsi_func(get_gsi_from_sbdf_t func) +{ + write_lock(&get_gsi_from_sbdf_lock); + get_gsi_from_sbdf =3D func; + write_unlock(&get_gsi_from_sbdf_lock); +} +EXPORT_SYMBOL_GPL(xen_acpi_register_get_gsi_func); + +int xen_acpi_get_gsi_from_sbdf(u32 sbdf) +{ + int ret =3D -EOPNOTSUPP; + + read_lock(&get_gsi_from_sbdf_lock); + if (get_gsi_from_sbdf) + ret =3D get_gsi_from_sbdf(sbdf); + read_unlock(&get_gsi_from_sbdf_lock); + + return ret; +} +EXPORT_SYMBOL_GPL(xen_acpi_get_gsi_from_sbdf); diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c index 3273cb8c2a66..4f75bc876454 100644 --- a/drivers/xen/privcmd.c +++ b/drivers/xen/privcmd.c @@ -850,15 +850,13 @@ static long privcmd_ioctl_mmap_resource(struct file *= file, static long privcmd_ioctl_pcidev_get_gsi(struct file *file, void __user *u= data) { #if defined(CONFIG_XEN_ACPI) - int rc =3D -EINVAL; + int rc; struct privcmd_pcidev_get_gsi kdata; =20 if (copy_from_user(&kdata, udata, sizeof(kdata))) return -EFAULT; =20 - if (IS_REACHABLE(CONFIG_XEN_PCIDEV_BACKEND)) - rc =3D pcistub_get_gsi_from_sbdf(kdata.sbdf); - + rc =3D xen_acpi_get_gsi_from_sbdf(kdata.sbdf); if (rc < 0) return rc; =20 diff --git a/drivers/xen/xen-pciback/pci_stub.c b/drivers/xen/xen-pciback/p= ci_stub.c index 2f3da5ac62cd..b616b7768c3b 100644 --- a/drivers/xen/xen-pciback/pci_stub.c +++ b/drivers/xen/xen-pciback/pci_stub.c @@ -227,7 +227,7 @@ static struct pci_dev *pcistub_device_get_pci_dev(struc= t xen_pcibk_device *pdev, } =20 #ifdef CONFIG_XEN_ACPI -int pcistub_get_gsi_from_sbdf(unsigned int sbdf) +static int pcistub_get_gsi_from_sbdf(unsigned int sbdf) { struct pcistub_device *psdev; int domain =3D (sbdf >> 16) & 0xffff; @@ -242,7 +242,6 @@ int pcistub_get_gsi_from_sbdf(unsigned int sbdf) =20 return psdev->gsi; } -EXPORT_SYMBOL_GPL(pcistub_get_gsi_from_sbdf); #endif =20 struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev, @@ -1757,11 +1756,19 @@ static int __init xen_pcibk_init(void) bus_register_notifier(&pci_bus_type, &pci_stub_nb); #endif =20 +#ifdef CONFIG_XEN_ACPI + xen_acpi_register_get_gsi_func(pcistub_get_gsi_from_sbdf); +#endif + return err; } =20 static void __exit xen_pcibk_cleanup(void) { +#ifdef CONFIG_XEN_ACPI + xen_acpi_register_get_gsi_func(NULL); +#endif + #ifdef CONFIG_PCI_IOV bus_unregister_notifier(&pci_bus_type, &pci_stub_nb); #endif diff --git a/include/xen/acpi.h b/include/xen/acpi.h index daa96a22d257..8cb081c633cc 100644 --- a/include/xen/acpi.h +++ b/include/xen/acpi.h @@ -91,13 +91,9 @@ static inline int xen_acpi_get_gsi_info(struct pci_dev *= dev, } #endif =20 -#ifdef CONFIG_XEN_PCI_STUB -int pcistub_get_gsi_from_sbdf(unsigned int sbdf); -#else -static inline int pcistub_get_gsi_from_sbdf(unsigned int sbdf) -{ - return -1; -} -#endif +typedef int (*get_gsi_from_sbdf_t)(u32 sbdf); + +void xen_acpi_register_get_gsi_func(get_gsi_from_sbdf_t func); +int xen_acpi_get_gsi_from_sbdf(u32 sbdf); =20 #endif /* _XEN_ACPI_H */ --=20 2.34.1