CC: [email protected] In-Reply-To: <[email protected]> References: <[email protected]> TO: David Matlack <[email protected]> TO: [email protected] CC: Ben Gardon <[email protected]> CC: Joerg Roedel <[email protected]> CC: Jim Mattson <[email protected]> CC: Wanpeng Li <[email protected]> CC: Vitaly Kuznetsov <[email protected]> CC: Sean Christopherson <[email protected]> CC: Paolo Bonzini <[email protected]> CC: Junaid Shahid <[email protected]> CC: Andrew Jones <[email protected]>
Hi David, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on kvm/queue] [also build test WARNING on vhost/linux-next linus/master v5.14-rc1 next-20210714] [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/David-Matlack/KVM-x86-mmu-Fast-page-fault-support-for-the-TDP-MMU/20210714-061057 base: https://git.kernel.org/pub/scm/virt/kvm/kvm.git queue :::::: branch date: 13 hours ago :::::: commit date: 13 hours ago config: x86_64-rhel-8.3-kselftests (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-341-g8af24329-dirty # https://github.com/0day-ci/linux/commit/b49595e7d2c56cc13bb1d6de2ab41002178b26ec git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review David-Matlack/KVM-x86-mmu-Fast-page-fault-support-for-the-TDP-MMU/20210714-061057 git checkout b49595e7d2c56cc13bb1d6de2ab41002178b26ec # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <[email protected]> sparse warnings: (new ones prefixed by >>) >> arch/x86/kvm/mmu/mmu.c:687:13: sparse: sparse: context imbalance in >> 'walk_shadow_page_lockless_begin' - different lock contexts for basic block arch/x86/kvm/mmu/mmu.c: note: in included file (through include/linux/rbtree.h, include/linux/mm_types.h, arch/x86/kvm/irq.h): include/linux/rcupdate.h:709:9: sparse: sparse: context imbalance in 'walk_shadow_page_lockless_end' - unexpected unlock arch/x86/kvm/mmu/mmu.c:4382:57: sparse: sparse: cast truncates bits from constant value (ffffff33 becomes 33) arch/x86/kvm/mmu/mmu.c:4384:56: sparse: sparse: cast truncates bits from constant value (ffffff0f becomes f) arch/x86/kvm/mmu/mmu.c:4386:57: sparse: sparse: cast truncates bits from constant value (ffffff55 becomes 55) vim +/walk_shadow_page_lockless_begin +687 arch/x86/kvm/mmu/mmu.c f160c7b7bb322b arch/x86/kvm/mmu.c Junaid Shahid 2016-12-06 686 c2a2ac2b563ccc arch/x86/kvm/mmu.c Xiao Guangrong 2011-07-12 @687 static void walk_shadow_page_lockless_begin(struct kvm_vcpu *vcpu) c2a2ac2b563ccc arch/x86/kvm/mmu.c Xiao Guangrong 2011-07-12 688 { b49595e7d2c56c arch/x86/kvm/mmu/mmu.c David Matlack 2021-07-13 689 if (is_tdp_mmu(vcpu->arch.mmu)) { b49595e7d2c56c arch/x86/kvm/mmu/mmu.c David Matlack 2021-07-13 690 kvm_tdp_mmu_walk_lockless_begin(); b49595e7d2c56c arch/x86/kvm/mmu/mmu.c David Matlack 2021-07-13 691 return; b49595e7d2c56c arch/x86/kvm/mmu/mmu.c David Matlack 2021-07-13 692 } b49595e7d2c56c arch/x86/kvm/mmu/mmu.c David Matlack 2021-07-13 693 c142786c629118 arch/x86/kvm/mmu.c Avi Kivity 2012-05-14 694 /* c142786c629118 arch/x86/kvm/mmu.c Avi Kivity 2012-05-14 695 * Prevent page table teardown by making any free-er wait during c142786c629118 arch/x86/kvm/mmu.c Avi Kivity 2012-05-14 696 * kvm_flush_remote_tlbs() IPI to all active vcpus. c142786c629118 arch/x86/kvm/mmu.c Avi Kivity 2012-05-14 697 */ c142786c629118 arch/x86/kvm/mmu.c Avi Kivity 2012-05-14 698 local_irq_disable(); 36ca7e0a577aa6 arch/x86/kvm/mmu.c Lan Tianyu 2016-03-13 699 c142786c629118 arch/x86/kvm/mmu.c Avi Kivity 2012-05-14 700 /* c142786c629118 arch/x86/kvm/mmu.c Avi Kivity 2012-05-14 701 * Make sure a following spte read is not reordered ahead of the write c142786c629118 arch/x86/kvm/mmu.c Avi Kivity 2012-05-14 702 * to vcpu->mode. c142786c629118 arch/x86/kvm/mmu.c Avi Kivity 2012-05-14 703 */ 36ca7e0a577aa6 arch/x86/kvm/mmu.c Lan Tianyu 2016-03-13 704 smp_store_mb(vcpu->mode, READING_SHADOW_PAGE_TABLES); c2a2ac2b563ccc arch/x86/kvm/mmu.c Xiao Guangrong 2011-07-12 705 } c2a2ac2b563ccc arch/x86/kvm/mmu.c Xiao Guangrong 2011-07-12 706 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/[email protected]
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