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PCI: Extend isolated function probing to s390

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Like the jailhouse hypervisor, s390's PCI architecture allows passing
isolated PCI functions to a guest 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.

Link: https://lore.kernel.org/r/20220628143100.3228092-5-schnelle@linux.ibm.com
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
This commit is contained in:
Niklas Schnelle 2022-06-28 16:30:59 +02:00 • committed by Bjorn Helgaas
parent db360b1ea7
commit 189c6c33ff
2 changed files with 9 additions and 1 deletions
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2
drivers/pci/probe.c
View file

@ -2668,7 +2668,7 @@ int pci_scan_slot(struct pci_bus *bus, int devfn)
* a hypervisor that passes through individual PCI * a hypervisor that passes through individual PCI
* functions. * functions.
*/ */
if (!jailhouse_paravirt()) if (!hypervisor_isolated_pci_functions())
break; break;
} }
fn = next_fn(bus, dev, fn); fn = next_fn(bus, dev, fn);

8
include/linux/hypervisor.h
View file

@ -32,4 +32,12 @@ static inline bool jailhouse_paravirt(void)
#endif /* !CONFIG_X86 */ #endif /* !CONFIG_X86 */
static inline bool hypervisor_isolated_pci_functions(void)
{
if (IS_ENABLED(CONFIG_S390))
return true;
return jailhouse_paravirt();
}
#endif /* __LINUX_HYPEVISOR_H */ #endif /* __LINUX_HYPEVISOR_H */