On Tue, Jun 24, 2025 at 02:29:27PM +0800, Huacai Chen wrote:

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 189c6c33ff421def040b9 ("PCI: Extend isolated function probing to s390").

Cc: stable@vger.kernel.org Signed-off-by: Huacai Chen chenhuacai@loongson.cn

Applied to pci/enumeration for v6.17, thanks!

---

include/linux/hypervisor.h | 3 +++ 1 file changed, 3 insertions(+)

diff --git a/include/linux/hypervisor.h b/include/linux/hypervisor.h index 9efbc54e35e5..be5417303ecf 100644 --- 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();

} -- 2.47.1