Re: [PATCH v2] iommu/hyper-v: Allow hyperv irq remapping without x2apic

[Tianyu Lan]

On 11/18/2022 4:11 AM, Nuno Das Neves wrote:
> If x2apic is not available, hyperv-iommu skips remapping
> irqs. This breaks root partition which always needs irqs
> remapped.
>
> Fix this by allowing irq remapping regardless of x2apic,
> and change hyperv_enable_irq_remapping() to return
> IRQ_REMAP_XAPIC_MODE in case x2apic is missing.
>
> Tested with root and non-root hyperv partitions.
>
> Signed-off-by: Nuno Das Neves<nunodasneves@xxxxxxxxxxxxxxxxxxx>
> ---
>   arch/x86/kernel/cpu/mshyperv.c |  6 ++++++
>   drivers/iommu/Kconfig          |  6 +++---
>   drivers/iommu/hyperv-iommu.c   | 11 ++++++++---
>   3 files changed, 17 insertions(+), 6 deletions(-)


Reviewed-by: Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx>