linux-kernel - [PATCH v3 0/4] Improve Hyper-V memory deposit error handling

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Message-ID: 
 <177031674698.186911.179832109354647364.stgit@skinsburskii-cloud-desktop.internal.cloudapp.net>
Date: Thu, 05 Feb 2026 18:42:04 +0000
From: Stanislav Kinsburskii <skinsburskii@...ux.microsoft.com>
To: kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
 decui@...rosoft.com, longli@...rosoft.com
Cc: linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 0/4] Improve Hyper-V memory deposit error handling

This series extends the MSHV driver to properly handle additional
memory-related error codes from the Microsoft Hypervisor by depositing
memory pages when needed.

Currently, when the hypervisor returns HV_STATUS_INSUFFICIENT_MEMORY
during partition creation, the driver calls hv_call_deposit_pages() to
provide the necessary memory. However, there are other memory-related
error codes that indicate the hypervisor needs additional memory
resources, but the driver does not attempt to deposit pages for these
cases.

This series introduces a dedicated helper function macro to identify all
memory-related error codes (HV_STATUS_INSUFFICIENT_MEMORY,
HV_STATUS_INSUFFICIENT_BUFFERS, HV_STATUS_INSUFFICIENT_DEVICE_DOMAINS, and
HV_STATUS_INSUFFICIENT_ROOT_MEMORY) and ensures the driver attempts to
deposit pages for all of them via new hv_deposit_memory() helper.

With these changes, partition creation becomes more robust by handling
all scenarios where the hypervisor requires additional memory deposits.

v3:
- Fix uninitialized num_pages variable in hv_deposit_memory_node() in case
  of HV_STATUS_INSUFFICIENT_ROOT_MEMORY status

v2:
- Rename hv_result_oom() into hv_result_needs_memory()

---

Stanislav Kinsburskii (4):
      mshv: Introduce hv_result_needs_memory() helper function
      mshv: Introduce hv_deposit_memory helper functions
      mshv: Handle insufficient contiguous memory hypervisor status
      mshv: Handle insufficient root memory hypervisor statuses

 drivers/hv/hv_common.c         |    3 ++
 drivers/hv/hv_proc.c           |   53 ++++++++++++++++++++++++++++++++++---
 drivers/hv/mshv_root_hv_call.c |   50 +++++++++++++++--------------------
 drivers/hv/mshv_root_main.c    |    5 +---
 include/asm-generic/mshyperv.h |   13 +++++++++
 include/hyperv/hvgdk_mini.h    |   57 +++++++++++++++++++++-------------------
 include/hyperv/hvhdk_mini.h    |    2 +
 7 files changed, 120 insertions(+), 63 deletions(-)