linux-kernel - Re: [PATCH v2 0/4] Improve Hyper-V memory deposit error handling

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <617915e0-f63b-2f0d-e285-2c968a992486@linux.microsoft.com>
Date: Tue, 3 Feb 2026 15:03:45 -0800
From: Mukesh R <mrathor@...ux.microsoft.com>
To: Stanislav Kinsburskii <skinsburskii@...ux.microsoft.com>,
 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: Re: [PATCH v2 0/4] Improve Hyper-V memory deposit error handling

On 2/2/26 09:58, Stanislav Kinsburskii wrote:
> 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.
> 
> 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           |   54 +++++++++++++++++++++++++++++++++++---
>   drivers/hv/mshv_root_hv_call.c |   45 +++++++++++++-------------------
>   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, 119 insertions(+), 60 deletions(-)
> 

for the whole series:

Reviewed-by: Mukesh R <mrathor@...ux.microsoft.com>