[PATCH v4 04/17] iommu/hyperv: don't setup IRQ remapping when running as root

[Wei Liu]

The IOMMU code needs more work. We're sure for now the IRQ remapping
hooks are not applicable when Linux is the root partition.

Signed-off-by: Wei Liu <wei.liu@xxxxxxxxxx>
Acked-by: Joerg Roedel <jroedel@xxxxxxx>
Reviewed-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
---
 drivers/iommu/hyperv-iommu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/hyperv-iommu.c b/drivers/iommu/hyperv-iommu.c
index 1d21a0b5f724..b7db6024e65c 100644
--- a/drivers/iommu/hyperv-iommu.c
+++ b/drivers/iommu/hyperv-iommu.c
@@ -20,6 +20,7 @@
 #include <asm/io_apic.h>
 #include <asm/irq_remapping.h>
 #include <asm/hypervisor.h>
+#include <asm/mshyperv.h>
 
 #include "irq_remapping.h"
 
@@ -122,7 +123,7 @@ static int __init hyperv_prepare_irq_remapping(void)
 
 	if (!hypervisor_is_type(X86_HYPER_MS_HYPERV) ||
 	    x86_init.hyper.msi_ext_dest_id() ||
-	    !x2apic_supported())
+	    !x2apic_supported() || hv_root_partition)
 		return -ENODEV;
 
 	fn = irq_domain_alloc_named_id_fwnode("HYPERV-IR", 0);
-- 
2.20.1