Re: [PATCH v2] mshv: Extend create partition ioctl to support cpu features

[kernel test robot]

Hi Nuno,

kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on v6.18-rc3 next-20251031]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Nuno-Das-Neves/mshv-Extend-create-partition-ioctl-to-support-cpu-features/20251031-054134
base:   linus/master
patch link:    https://lore.kernel.org/r/1761860431-11208-1-git-send-email-nunodasneves%40linux.microsoft.com
patch subject: [PATCH v2] mshv: Extend create partition ioctl to support cpu features
config: arm64-randconfig-001-20251102 (https://download.01.org/0day-ci/archive/20251102/202511022246.Tn2DmYLd-lkp@xxxxxxxxx/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project d2625a438020ad35330cda29c3def102c1687b1b)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251102/202511022246.Tn2DmYLd-lkp@xxxxxxxxx/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202511022246.Tn2DmYLd-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> drivers/hv/mshv_root_main.c:1875:47: warning: unused variable 'disabled_xsave' [-Wunused-variable]
    1875 |         union hv_partition_processor_xsave_features *disabled_xsave;
         |                                                      ^~~~~~~~~~~~~~
   1 warning generated.


vim +/disabled_xsave +1875 drivers/hv/mshv_root_main.c

  1864	
  1865	static_assert(MSHV_NUM_CPU_FEATURES_BANKS <=
  1866		      HV_PARTITION_PROCESSOR_FEATURES_BANKS);
  1867	
  1868	static long mshv_ioctl_process_pt_flags(void __user *user_arg, u64 *pt_flags,
  1869						struct hv_partition_creation_properties *cr_props,
  1870						union hv_partition_isolation_properties *isol_props)
  1871	{
  1872		int i;
  1873		struct mshv_create_partition_v2 args;
  1874		union hv_partition_processor_features *disabled_procs;
> 1875		union hv_partition_processor_xsave_features *disabled_xsave;
  1876	
  1877		/* First, copy orig struct in case user is on previous versions */
  1878		if (copy_from_user(&args, user_arg,
  1879				   sizeof(struct mshv_create_partition)))
  1880			return -EFAULT;
  1881	
  1882		if ((args.pt_flags & ~MSHV_PT_FLAGS_MASK) ||
  1883		     args.pt_isolation >= MSHV_PT_ISOLATION_COUNT)
  1884			return -EINVAL;
  1885	
  1886		disabled_procs = &cr_props->disabled_processor_features;
  1887	
  1888		/* Disable all processor features first */
  1889		for (i = 0; i < HV_PARTITION_PROCESSOR_FEATURES_BANKS; i++)
  1890			disabled_procs->as_uint64[i] = -1;
  1891	

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