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xen: Remove dependency between pciback and privcmd
Commit2fae6bb7be
("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:2fae6bb7be
("xen/privcmd: Add new syscall to get gsi from dev") Reported-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com> Signed-off-by: Jiqian Chen <Jiqian.Chen@amd.com> Reviewed-by: Juergen Gross <jgross@suse.com> Message-ID: <20241012084537.1543059-1-Jiqian.Chen@amd.com> Signed-off-by: Juergen Gross <jgross@suse.com>
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@ -261,7 +261,6 @@ config XEN_SCSI_BACKEND
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config XEN_PRIVCMD
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tristate "Xen hypercall passthrough driver"
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depends on XEN
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imply XEN_PCIDEV_BACKEND
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default m
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help
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The hypercall passthrough driver allows privileged user programs to
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@ -125,3 +125,27 @@ int xen_acpi_get_gsi_info(struct pci_dev *dev,
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return 0;
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}
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EXPORT_SYMBOL_GPL(xen_acpi_get_gsi_info);
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static get_gsi_from_sbdf_t get_gsi_from_sbdf;
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static DEFINE_RWLOCK(get_gsi_from_sbdf_lock);
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void xen_acpi_register_get_gsi_func(get_gsi_from_sbdf_t func)
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{
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write_lock(&get_gsi_from_sbdf_lock);
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get_gsi_from_sbdf = func;
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write_unlock(&get_gsi_from_sbdf_lock);
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}
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EXPORT_SYMBOL_GPL(xen_acpi_register_get_gsi_func);
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int xen_acpi_get_gsi_from_sbdf(u32 sbdf)
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{
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int ret = -EOPNOTSUPP;
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read_lock(&get_gsi_from_sbdf_lock);
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if (get_gsi_from_sbdf)
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ret = get_gsi_from_sbdf(sbdf);
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read_unlock(&get_gsi_from_sbdf_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(xen_acpi_get_gsi_from_sbdf);
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@ -850,15 +850,13 @@ out:
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static long privcmd_ioctl_pcidev_get_gsi(struct file *file, void __user *udata)
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{
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#if defined(CONFIG_XEN_ACPI)
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int rc = -EINVAL;
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int rc;
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struct privcmd_pcidev_get_gsi kdata;
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if (copy_from_user(&kdata, udata, sizeof(kdata)))
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return -EFAULT;
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if (IS_REACHABLE(CONFIG_XEN_PCIDEV_BACKEND))
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rc = pcistub_get_gsi_from_sbdf(kdata.sbdf);
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rc = xen_acpi_get_gsi_from_sbdf(kdata.sbdf);
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if (rc < 0)
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return rc;
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@ -227,7 +227,7 @@ static struct pci_dev *pcistub_device_get_pci_dev(struct xen_pcibk_device *pdev,
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}
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#ifdef CONFIG_XEN_ACPI
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int pcistub_get_gsi_from_sbdf(unsigned int sbdf)
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static int pcistub_get_gsi_from_sbdf(unsigned int sbdf)
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{
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struct pcistub_device *psdev;
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int domain = (sbdf >> 16) & 0xffff;
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@ -242,7 +242,6 @@ int pcistub_get_gsi_from_sbdf(unsigned int sbdf)
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return psdev->gsi;
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}
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EXPORT_SYMBOL_GPL(pcistub_get_gsi_from_sbdf);
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#endif
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struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev,
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@ -1757,11 +1756,19 @@ static int __init xen_pcibk_init(void)
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bus_register_notifier(&pci_bus_type, &pci_stub_nb);
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#endif
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#ifdef CONFIG_XEN_ACPI
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xen_acpi_register_get_gsi_func(pcistub_get_gsi_from_sbdf);
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#endif
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return err;
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}
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static void __exit xen_pcibk_cleanup(void)
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{
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#ifdef CONFIG_XEN_ACPI
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xen_acpi_register_get_gsi_func(NULL);
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#endif
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#ifdef CONFIG_PCI_IOV
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bus_unregister_notifier(&pci_bus_type, &pci_stub_nb);
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#endif
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@ -35,6 +35,8 @@
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#include <linux/types.h>
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typedef int (*get_gsi_from_sbdf_t)(u32 sbdf);
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#ifdef CONFIG_XEN_DOM0
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#include <asm/xen/hypervisor.h>
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#include <xen/xen.h>
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@ -72,6 +74,8 @@ int xen_acpi_get_gsi_info(struct pci_dev *dev,
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int *gsi_out,
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int *trigger_out,
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int *polarity_out);
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void xen_acpi_register_get_gsi_func(get_gsi_from_sbdf_t func);
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int xen_acpi_get_gsi_from_sbdf(u32 sbdf);
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#else
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static inline void xen_acpi_sleep_register(void)
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{
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@ -89,12 +93,12 @@ static inline int xen_acpi_get_gsi_info(struct pci_dev *dev,
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{
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return -1;
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}
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#endif
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#ifdef CONFIG_XEN_PCI_STUB
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int pcistub_get_gsi_from_sbdf(unsigned int sbdf);
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#else
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static inline int pcistub_get_gsi_from_sbdf(unsigned int sbdf)
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static inline void xen_acpi_register_get_gsi_func(get_gsi_from_sbdf_t func)
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{
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}
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static inline int xen_acpi_get_gsi_from_sbdf(u32 sbdf)
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{
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return -1;
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}
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