@@ -2602,11 +2602,11 @@ static int next_fn(struct pci_bus *bus, struct pci_dev *dev, int fn)
if (dev && !dev->multifunction)
return -ENODEV;
/*
- * Usually a function 0 is required but the jailhouse hypervisor may
- * pass individual functions. For non-contiguous multifunction devices
- * some functions may also be missing.
+ * Usually a function 0 is required but some hypervisors may pass
+ * individual functions. For non-contiguous multifunction devices some
+ * functions may also be missing.
*/
- if (!fn && !dev && !jailhouse_paravirt())
+ if (!fn && !dev && !hypervisor_isolated_pci_functions())
return -ENODEV;
return (fn <= 6) ? fn + 1 : -ENODEV;
}
@@ -32,4 +32,13 @@ static inline bool jailhouse_paravirt(void)
#endif /* !CONFIG_X86 */
+static inline bool hypervisor_isolated_pci_functions(void)
+{
+ if (IS_ENABLED(CONFIG_S390))
+ return true;
+ else
+ return jailhouse_paravirt();
+}
+
+
#endif /* __LINUX_HYPEVISOR_H */
Like the jailhouse hypervisor s390's PCI architecture allows passing isolated PCI functions to an OS instance. As of now this is was not utilized even with multi-function support as the s390 PCI code makes sure that only virtual PCI busses including a function with devfn 0 are presented to the PCI subsystem. A subsequent change will remove this restriction. Allow probing such functions by replacing the existing check for jailhouse_paravirt() with a new hypervisor_isolated_pci_functions() helper. Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> --- drivers/pci/probe.c | 8 ++++---- include/linux/hypervisor.h | 9 +++++++++ 2 files changed, 13 insertions(+), 4 deletions(-)