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| author | Niklas Schnelle <schnelle@linux.ibm.com> | 2022-06-28 16:30:59 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2022-07-22 16:06:03 -0500 |
| commit | 189c6c33ff421def040b904fb14ef76c5bf5af4c (patch) | |
| tree | 864dd92ce7aec34c0cf4929b14c70214ee29f3a8 /include/linux/hypervisor.h | |
| parent | db360b1ea7faef290471bc1b2a7463b96fd20a07 (diff) | |
| download | lwn-189c6c33ff421def040b904fb14ef76c5bf5af4c.tar.gz lwn-189c6c33ff421def040b904fb14ef76c5bf5af4c.zip | |
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.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>
Diffstat (limited to 'include/linux/hypervisor.h')
| -rw-r--r-- | include/linux/hypervisor.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/hypervisor.h b/include/linux/hypervisor.h index fc08b433c856..9efbc54e35e5 100644 --- a/include/linux/hypervisor.h +++ b/include/linux/hypervisor.h @@ -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 */ |