[PATCH v3 33/35] iommu/hyper-v: Disable IRQ pseudo-remapping if 15 bit APIC IDs are available

David Woodhouse
2020-10-24T21:37:58Z

From: David Woodhouse <dwmw@amazon.co.uk>

If the 15-bit APIC ID support is present in emulated MSI then there's no
need for the pseudo-remapping support.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
drivers/iommu/hyperv-iommu.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/iommu/hyperv-iommu.c b/drivers/iommu/hyperv-iommu.c
index a629a6be65c7..9438daa24fdb 100644
--- a/drivers/iommu/hyperv-iommu.c
+++ b/drivers/iommu/hyperv-iommu.c
@@ -121,6 +121,7 @@ static int __init hyperv_prepare_irq_remapping(void)
int i;

if (!hypervisor_is_type(X86_HYPER_MS_HYPERV) ||
+ x86_init.hyper.msi_ext_dest_id() ||
!x2apic_supported())
return -ENODEV;