PCI: Extend isolated function probing to LoongArch

Like s390 and the jailhouse hypervisor, LoongArch's PCI architecture allows
passing isolated PCI functions to a guest OS instance. So it is possible
that there is a multi-function device without function 0 for the host or
guest.

Allow probing such functions by adding a IS_ENABLED(CONFIG_LOONGARCH) case
in the hypervisor_isolated_pci_functions() helper.

This is similar to commit 189c6c33ff42 ("PCI: Extend isolated function
probing to s390").

Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20250624062927.4037734-1-chenhuacai@loongson.cn

diff --git a/include/linux/hypervisor.h b/include/linux/hypervisor.h
index 9efbc54e35e5967174c586509961dab3764679ca..be5417303ecf698941b27914992544c72b4a39ff 100644 (file)
--- a/include/linux/hypervisor.h
+++ b/include/linux/hypervisor.h
@@ -37,6 +37,9 @@ static inline bool hypervisor_isolated_pci_functions(void)
        if (IS_ENABLED(CONFIG_S390))
                return true;
 
+       if (IS_ENABLED(CONFIG_LOONGARCH))
+               return true;
+
        return jailhouse_paravirt();
 }