kernel/linux.git/include/uapi/linux/hyperv.h, branch v6.19.11

hyper-v: Mark inner union in hv_kvp_exchg_msg_value as packed

2026-03-04T12:20:05+00:00

[ Upstream commit 1e5271393d777f6159d896943b4c44c4f3ecff52 ] The unpacked union within a packed struct generates alignment warnings on clang for 32-bit ARM: ./usr/include/linux/hyperv.h:361:2: error: field within 'struct hv_kvp_exchg_msg_value' is less aligned than 'union hv_kvp_exchg_msg_value::(anonymous at ./usr/include/linux/hyperv.h:361:2)' and is usually due to 'struct hv_kvp_exchg_msg_value' being packed, which can lead to unaligned accesses [-Werror,-Wunaligned-access] 361 | union { | ^ With the recent changes to compile-test the UAPI headers in more cases, this warning in combination with CONFIG_WERROR breaks the build. Fix the warning. Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202512140314.DzDxpIVn-lkp@intel.com/ Reported-by: Nathan Chancellor Closes: https://lore.kernel.org/linux-kbuild/20260110-uapi-test-disable-headers-arm-clang-unaligned-access-v1-1-b7b0fa541daa@kernel.org/ Suggested-by: Arnd Bergmann Link: https://lore.kernel.org/linux-kbuild/29b2e736-d462-45b7-a0a9-85f8d8a3de56@app.fastmail.com/ Signed-off-by: Thomas Weißschuh Acked-by: Wei Liu (Microsoft) Tested-by: Nicolas Schier Reviewed-by: Nicolas Schier Acked-by: Greg Kroah-Hartman Link: https://patch.msgid.link/20260115-kbuild-alignment-vbox-v1-1-076aed1623ff@linutronix.de Signed-off-by: Nathan Chancellor Signed-off-by: Sasha Levin

hv_utils: Add comment about max VMbus packet size in VSS driver

2022-02-18T13:08:18+00:00

The VSS driver allocates a VMbus receive buffer significantly larger than sizeof(hv_vss_msg), with no explanation. To help prevent future mistakes, add a #define and comment about why this is done. No functional change. Signed-off-by: Michael Kelley Link: https://lore.kernel.org/r/1644423070-75125-1-git-send-email-mikelley@microsoft.com Signed-off-by: Wei Liu

hyper-v: Replace uuid.h with types.h

2021-10-06T12:05:51+00:00

There is no user of anything in uuid.h in the hyperv.h. Replace it with more appropriate types.h. Fixes: f081bbb3fd03 ("hyper-v: Remove internal types from UAPI header") Reported-by: Greg Kroah-Hartman Signed-off-by: Andy Shevchenko Reviewed-by: Haiyang Zhang Link: https://lore.kernel.org/r/20211001135544.1823-1-andriy.shevchenko@linux.intel.com Signed-off-by: Wei Liu

hyperv: hyperv.h: drop a duplicated word

2020-07-23T17:55:20+00:00

Drop the repeated word "the" in a comment. Signed-off-by: Randy Dunlap Cc: "K. Y. Srinivasan" Cc: Haiyang Zhang Cc: Stephen Hemminger Cc: Wei Liu Cc: linux-hyperv@vger.kernel.org Link: https://lore.kernel.org/r/20200719002841.20369-1-rdunlap@infradead.org Signed-off-by: Wei Liu

hyper-v: Remove internal types from UAPI header

2020-04-22T20:10:05+00:00

The uuid_le mistakenly comes to be an UAPI type. Since it's luckily not used by Hyper-V APIs, we may replace with POD types, i.e. __u8 array. Note, previously shared uuid_be had been removed from UAPI few releases ago. This is a continuation of that process towards removing uuid_le one. Note, there is no ABI change! Signed-off-by: Andy Shevchenko Link: https://lore.kernel.org/r/20200422131818.23088-1-andriy.shevchenko@linux.intel.com Signed-off-by: Wei Liu

License cleanup: add SPDX license identifier to uapi header files with a license

2017-11-02T10:20:11+00:00

Many user space API headers have licensing information, which is either incomplete, badly formatted or just a shorthand for referring to the license under which the file is supposed to be. This makes it hard for compliance tools to determine the correct license. Update these files with an SPDX license identifier. The identifier was chosen based on the license information in the file. GPL/LGPL licensed headers get the matching GPL/LGPL SPDX license identifier with the added 'WITH Linux-syscall-note' exception, which is the officially assigned exception identifier for the kernel syscall exception: NOTE! This copyright does *not* cover user programs that use kernel services by normal system calls - this is merely considered normal use of the kernel, and does *not* fall under the heading of "derived work". This exception makes it possible to include GPL headers into non GPL code, without confusing license compliance tools. Headers which have either explicit dual licensing or are just licensed under a non GPL license are updated with the corresponding SPDX identifier and the GPLv2 with syscall exception identifier. The format is: ((GPL-2.0 WITH Linux-syscall-note) OR SPDX-ID-OF-OTHER-LICENSE) SPDX license identifiers are a legally binding shorthand, which can be used instead of the full boiler plate text. The update does not remove existing license information as this has to be done on a case by case basis and the copyright holders might have to be consulted. This will happen in a separate step. This patch is based on work done by Thomas Gleixner and Kate Stewart and Philippe Ombredanne. See the previous patch in this series for the methodology of how this patch was researched. Reviewed-by: Kate Stewart Reviewed-by: Philippe Ombredanne Reviewed-by: Thomas Gleixner Signed-off-by: Greg Kroah-Hartman

tools: hv: report ENOSPC errors in hv_fcopy_daemon

2015-12-15T03:12:21+00:00

Currently some "Unspecified error 0x80004005" is reported on the Windows side if something fails. Handle the ENOSPC case and return ERROR_DISK_FULL, which allows at least Copy-VMFile to report a meaning full error. Signed-off-by: Olaf Hering Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman

Drivers: hv: fcopy: full handshake support

2015-05-24T19:17:42+00:00

Introduce FCOPY_VERSION_1 to support kernel replying to the negotiation message with its own version. Signed-off-by: Vitaly Kuznetsov Tested-by: Alex Ng Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman

Drivers: hv: vss: full handshake support

2015-05-24T19:17:41+00:00

Introduce VSS_OP_REGISTER1 to support kernel replying to the negotiation message with its own version. Signed-off-by: Vitaly Kuznetsov Tested-by: Alex Ng Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman

Drivers: hv: util: make struct hv_do_fcopy match Hyper-V host messages

2014-11-07T18:21:44+00:00

An attempt to fix fcopy on i586 (bc5a5b0 Drivers: hv: util: Properly pack the data for file copy functionality) led to a regression on x86_64 (and actually didn't fix i586 breakage). Fcopy messages from Hyper-V host come in the following format: struct do_fcopy_hdr | 36 bytes 0000 | 4 bytes offset | 8 bytes size | 4 bytes data | 6144 bytes On x86_64 struct hv_do_fcopy matched this format without ' __attribute__((packed))' and on i586 adding ' __attribute__((packed))' to it doesn't change anything. Keep the structure packed and add padding to match re reality. Tested both i586 and x86_64 on Hyper-V Server 2012 R2. Signed-off-by: Vitaly Kuznetsov Signed-off-by: K. Y. Srinivasan Cc: Signed-off-by: Greg Kroah-Hartman