linux-kernel - [PATCH v4 0/2] ARM64 support for doorbell and intercept SINTs

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Message-Id: <20260211170728.3056226-1-anirudh@anirudhrb.com>
Date: Wed, 11 Feb 2026 17:07:26 +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 v4 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 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.

Changes in v4:
  - Hypervisor now exposes a synthetic register to read the SINT vector
    instead of using an ACPI platform device. So make changes to accomodate that.

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     | 181 +++++++++++++++++++++++++++++++++---
 include/hyperv/hvgdk_mini.h |   2 +
 4 files changed, 181 insertions(+), 66 deletions(-)

-- 
2.34.1