linux-kernel - [PATCH v3 0/2] ARM64 support for doorbell and intercept SINTs

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Message-Id: <20260204174237.1201153-1-anirudh@anirudhrb.com>
Date: Wed,  4 Feb 2026 17:42:35 +0000
From: Anirudh Rayabharam <anirudh@...rudhrb.com>
To: kys@...rosoft.com,
	haiyangz@...rosoft.com,
	wei.liu@...nel.org,
	decui@...rosoft.com,
	longli@...rosoft.com,
	linux-hyperv@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: anirudh@...rudhrb.com
Subject: [PATCH v3 0/2] ARM64 support for doorbell and intercept SINTs

From: "Anirudh Rayabharam (Microsoft)" <anirudh@...rudhrb.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 INTID for SINTs should be in the SGI or PPI range. The
hypervisor exposes a virtual device in the ACPI that reserves a
PPI for this use. Introduce a platform_driver that binds to this ACPI
device and obtains the interrupt vector that can be used for SINTs.

Changes in v3:
  - Moved the hv_root_partition() check into the reboot notifier
    to avoid doing it multiple times.

v2: https://lore.kernel.org/linux-hyperv/20260202182706.648192-1-anirudh@anirudhrb.com/
Changes in v2:
Addressed review comments:
  - Moved more stuff into mshv_synic.c
  - Code simplifications
  - Removed unnecessary debug prints

v1: https://lore.kernel.org/linux-hyperv/20260128160437.3342167-1-anirudh@anirudhrb.com/

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 |  59 ++-------
 drivers/hv/mshv_synic.c     | 232 ++++++++++++++++++++++++++++++++++--
 3 files changed, 230 insertions(+), 66 deletions(-)

-- 
2.34.1