5:33 a.m.
Hi Steven,
[FYI, it's a private test report for your RFC patch.]
[auto build test WARNING on arm64/for-next/core]
[also build test WARNING on v5.11-rc3]
[cannot apply to kvmarm/next kvm/linux-next next-20210115]
[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]
url:
https://github.com/0day-ci/linux/commits/Steven-Price/MTE-support-for-KVM...
base: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
config: arm64-allyesconfig (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O
~/bin/make.cross
chmod +x ~/bin/make.cross
#
https://github.com/0day-ci/linux/commit/ddde8cff287aad027c9fa0015afe26ced...
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review
Steven-Price/MTE-support-for-KVM-guest/20210115-233109
git checkout ddde8cff287aad027c9fa0015afe26ced5041f50
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp(a)intel.com>
All warnings (new ones prefixed by >>):
arch/arm64/kvm/arm.c: In function 'kvm_vm_ioctl_mte_copy_tags':
> arch/arm64/kvm/arm.c:1313:9: warning: variable 'pages'
set but not used [-Wunused-but-set-variable]
1313 | size_t pages;
| ^~~~~
vim +/pages +1313 arch/arm64/kvm/arm.c
1305
1306 static int kvm_vm_ioctl_mte_copy_tags(struct kvm *kvm,
1307 struct kvm_arm_copy_mte_tags *copy_tags)
1308 {
1309 gpa_t guest_ipa = copy_tags->guest_ipa;
1310 size_t length = copy_tags->length;
1311 void __user *tags = copy_tags->addr;
1312 gpa_t gfn;
1313 size_t pages;
1314 bool write = !(copy_tags->flags
& KVM_ARM_TAGS_FROM_GUEST);
1315
1316 if (copy_tags->flags & ~KVM_ARM_TAGS_FROM_GUEST)
1317 return -EINVAL;
1318
1319 if (length & ~PAGE_MASK || guest_ipa & ~PAGE_MASK)
1320 return -EINVAL;
1321
1322 gfn = gpa_to_gfn(guest_ipa);
1323 pages = length >> PAGE_SHIFT;
1324
1325 while (length > 0) {
1326 kvm_pfn_t pfn = gfn_to_pfn_prot(kvm, gfn, write, NULL);
1327 void *maddr;
1328 unsigned long num_tags = PAGE_SIZE / MTE_GRANULE_SIZE;
1329
1330 if (is_error_noslot_pfn(pfn))
1331 return -ENOENT;
1332
1333 maddr = page_address(pfn_to_page(pfn));
1334
1335 if (!write) {
1336 num_tags = mte_copy_tags_to_user(tags, maddr, num_tags);
1337 kvm_release_pfn_clean(pfn);
1338 } else {
1339 num_tags = mte_copy_tags_from_user(maddr, tags,
1340 num_tags);
1341 kvm_release_pfn_dirty(pfn);
1342 }
1343
1344 if (num_tags != PAGE_SIZE / MTE_GRANULE_SIZE)
1345 return -EFAULT;
1346
1347 gfn++;
1348 tags += num_tags;
1349 length -= PAGE_SIZE;
1350 }
1351
1352 return 0;
1353 }
1354
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org