linux-kernel - [PATCH v3 0/3] Nested virtualization fixes for root partition

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Message-Id: <1752261532-7225-1-git-send-email-nunodasneves@linux.microsoft.com>
Date: Fri, 11 Jul 2025 12:18:49 -0700
From: Nuno Das Neves <nunodasneves@...ux.microsoft.com>
To: linux-hyperv@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org,
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	Nuno Das Neves <nunodasneves@...ux.microsoft.com>
Subject: [PATCH v3 0/3] Nested virtualization fixes for root partition

Fixes for running as nested root partition on the Microsoft Hypervisor.

The first patch changes vmbus to make hypercalls to the L0 hypervisor
instead of the L1. This is needed because L0 hypervisor, not the L1, is
the one hosting the Windows root partition with the VMM that provides
vmbus.

The 2nd and 3rd patches fix interrupt unmasking on nested. In this
scenario, the L1 (nested) hypervisor does the interrupt mapping to root
partition cores. The vectors just need to be mapped with
MAP_DEVICE_INTERRUPT instead of affinitized with RETARGET_INTERRUPT.

Changes in v3:
- Remove 3 patches (#1,#3,#4 from v2) which were merged already (Wei Liu)
- Fix bug in #1 introduced in v2 (Michael Kelley)
- Improve commit message in #2 (Michael Kelley)
- Document return value of hv_map_msi_interrupt() in #2 (Michael Kelley)

Changes in v2:
- Reword commit messages for clarity (Michael Kelley, Bjorn Helgaas)
- Open-code nested hypercalls to reduce unnecessary code (Michael Kelley)
- Add patch (#3) to fix cpu_online_mask issue (Thomas Gleixner)
- Add patch (#4) to fix error return values (Michael Kelley)
- Remove several redundant error messages and checks (Michael Kelley)

Nuno Das Neves (1):
  Drivers: hv: Use nested hypercall for post message and signal event

Stanislav Kinsburskii (2):
  x86/hyperv: Expose hv_map_msi_interrupt()
  PCI: hv: Use the correct hypercall for unmasking interrupts on nested

 arch/x86/hyperv/irqdomain.c         | 40 +++++++++++++++++++++--------
 arch/x86/include/asm/mshyperv.h     | 22 ++--------------
 drivers/hv/connection.c             |  5 +++-
 drivers/hv/hv.c                     |  6 +++--
 drivers/pci/controller/pci-hyperv.c | 18 +++++++++++--
 5 files changed, 55 insertions(+), 36 deletions(-)

-- 
2.34.1