Re: [PATCH v6 0/2] ARM64 support for doorbell and intercept SINTs

[Wei Liu <wei.liu@kernel.org>]

On Wed, Feb 25, 2026 at 12:44:01PM +0000, Anirudh Rayabharam wrote:
> From: "Anirudh Rayabharam (Microsoft)" <anirudh@anirudhrb.com>
> 
> On x86, the HYPERVISOR_CALLBACK_VECTOR is used to receive synthetic
> interrupts (SINTs) from the hypervisor for doorbells and intercepts.
> There is no such vector reserved for arm64.
> 
> On arm64, the hypervisor exposes a synthetic register that can be read
> to find the INTID that should be used for SINTs. This INTID is in the
> PPI range.
> 
[...]
> Anirudh Rayabharam (Microsoft) (2):
>   mshv: refactor synic init and cleanup
>   mshv: add arm64 support for doorbell & intercept SINTs
> 
>  drivers/hv/mshv_root.h      |   5 +-
>  drivers/hv/mshv_root_main.c |  64 ++----------
>  drivers/hv/mshv_synic.c     | 188 +++++++++++++++++++++++++++++++++---
>  include/hyperv/hvgdk_mini.h |   2 +
>  4 files changed, 185 insertions(+), 74 deletions(-)

Applied to hyperv-fixes.

I debated a bit whether this is a new feature or a fix and decided it
fixes an important gap in arm64 support.

Wei

> 
> -- 
> 2.34.1
> 
>