Re: [PATCH v5 04/16] iommu/hyperv: don't setup IRQ remapping when running as root

Pavel Tatashin
2021-01-20T16:13:33Z

On Wed, Jan 20, 2021 at 7:01 AM Wei Liu <wei.liu@kernel.org> wrote:
>
> 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@kernel.org>
> Acked-by: Joerg Roedel <jroedel@suse.de>
> Reviewed-by: Vitaly Kuznetsov <vkuznets@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;

Reviewed-by: Pavel Tatashin <pasha.tatashin@soleen.com>