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Message-ID: <202411061526.RAuCXKJh-lkp@intel.com>
Date: Wed, 6 Nov 2024 16:22:08 +0800
From: kernel test robot <lkp@...el.com>
To: James Houghton <jthoughton@...gle.com>,
Sean Christopherson <seanjc@...gle.com>,
Paolo Bonzini <pbonzini@...hat.com>
Cc: oe-kbuild-all@...ts.linux.dev, David Matlack <dmatlack@...gle.com>,
David Rientjes <rientjes@...gle.com>,
James Houghton <jthoughton@...gle.com>,
Marc Zyngier <maz@...nel.org>,
Oliver Upton <oliver.upton@...ux.dev>, Wei Xu <weixugc@...gle.com>,
Yu Zhao <yuzhao@...gle.com>,
Axel Rasmussen <axelrasmussen@...gle.com>, kvm@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 04/11] KVM: x86/mmu: Relax locking for
kvm_test_age_gfn and kvm_age_gfn
Hi James,
kernel test robot noticed the following build warnings:
[auto build test WARNING on a27e0515592ec9ca28e0d027f42568c47b314784]
url: https://github.com/intel-lab-lkp/linux/commits/James-Houghton/KVM-Remove-kvm_handle_hva_range-helper-functions/20241106-025133
base: a27e0515592ec9ca28e0d027f42568c47b314784
patch link: https://lore.kernel.org/r/20241105184333.2305744-5-jthoughton%40google.com
patch subject: [PATCH v8 04/11] KVM: x86/mmu: Relax locking for kvm_test_age_gfn and kvm_age_gfn
config: x86_64-rhel-8.3 (https://download.01.org/0day-ci/archive/20241106/202411061526.RAuCXKJh-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241106/202411061526.RAuCXKJh-lkp@intel.com/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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202411061526.RAuCXKJh-lkp@intel.com/
All warnings (new ones prefixed by >>):
arch/x86/kvm/mmu/tdp_mmu.c: In function 'kvm_tdp_mmu_age_spte':
>> arch/x86/kvm/mmu/tdp_mmu.c:1189:23: warning: ignoring return value of '__tdp_mmu_set_spte_atomic' declared with attribute 'warn_unused_result' [-Wunused-result]
1189 | (void)__tdp_mmu_set_spte_atomic(iter, new_spte);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
vim +1189 arch/x86/kvm/mmu/tdp_mmu.c
1166
1167 /*
1168 * Mark the SPTEs range of GFNs [start, end) unaccessed and return non-zero
1169 * if any of the GFNs in the range have been accessed.
1170 *
1171 * No need to mark the corresponding PFN as accessed as this call is coming
1172 * from the clear_young() or clear_flush_young() notifier, which uses the
1173 * return value to determine if the page has been accessed.
1174 */
1175 static void kvm_tdp_mmu_age_spte(struct tdp_iter *iter)
1176 {
1177 u64 new_spte;
1178
1179 if (spte_ad_enabled(iter->old_spte)) {
1180 iter->old_spte = tdp_mmu_clear_spte_bits_atomic(iter->sptep,
1181 shadow_accessed_mask);
1182 new_spte = iter->old_spte & ~shadow_accessed_mask;
1183 } else {
1184 new_spte = mark_spte_for_access_track(iter->old_spte);
1185 /*
1186 * It is safe for the following cmpxchg to fail. Leave the
1187 * Accessed bit set, as the spte is most likely young anyway.
1188 */
> 1189 (void)__tdp_mmu_set_spte_atomic(iter, new_spte);
1190 }
1191
1192 trace_kvm_tdp_mmu_spte_changed(iter->as_id, iter->gfn, iter->level,
1193 iter->old_spte, new_spte);
1194 }
1195
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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