Commit 189c6c33 authored by Niklas Schnelle's avatar Niklas Schnelle Committed by Bjorn Helgaas

PCI: Extend isolated function probing to s390

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.comSigned-off-by: default avatarNiklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: default avatarPierre Morel <pmorel@linux.ibm.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
parent db360b1e
......@@ -2668,7 +2668,7 @@ int pci_scan_slot(struct pci_bus *bus, int devfn)
* a hypervisor that passes through individual PCI
* functions.
*/
if (!jailhouse_paravirt())
if (!hypervisor_isolated_pci_functions())
break;
}
fn = next_fn(bus, dev, fn);
......
......@@ -32,4 +32,12 @@ static inline bool jailhouse_paravirt(void)
#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 */
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