# RE: \[PATCH v6 16/16\] iommu/hyperv: setup an IO-APIC IRQ remapping domain for root partition

- From: Michael Kelley via Virtualization \<hidden\>
- Date: 2021-02-04 17:55:30 
- List: virtualization
- Page: https://ratatoskr.run/virtualization/2021/02/6258937
- Thread: https://ratatoskr.run/linux-hyperv/2021/02/6257199/t.md

```text
From: Wei Liu <wei.liu@kernel.org> Sent: Wednesday, February 3, 2021 7:05 AM
> 
> Just like MSI/MSI-X, IO-APIC interrupts are remapped by Microsoft
> Hypervisor when Linux runs as the root partition. Implement an IRQ
> domain to handle mapping and unmapping of IO-APIC interrupts.
> 
> Signed-off-by: Wei Liu <wei.liu@kernel.org>
> ---
> v6:
> 1. Simplify code due to changes in a previous patch.
> ---
>  arch/x86/hyperv/irqdomain.c     |  25 +++++
>  arch/x86/include/asm/mshyperv.h |   4 +
>  drivers/iommu/hyperv-iommu.c    | 177 +++++++++++++++++++++++++++++++-
>  3 files changed, 203 insertions(+), 3 deletions(-)
> 

Reviewed-by: Michael Kelley <redacted>
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