From: Wei Liu <wei....@kernel.org> Sent: Wednesday, January 20, 2021 4:01 AM
>
> 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....@kernel.org>
> Acked-by: Joerg Roedel <jroe...@suse.de>
> Reviewed-by: Vitaly Kuznetsov <vkuzn...@redhat.com>
> ---
> 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
Reviewed-by: Michael Kelley <mikel...@microsoft.com>
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