tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: 263cf8eeb5316aeebd9d692e9966df029f65889f commit: a74f93b7e7c0d8a2114055ed0c652cc735a7a07b [2665/2665] [backport]rme: populate guest memory region without guest_memfd config: arm64-allmodconfig (https://download.01.org/0day-ci/archive/20250812/202508121448.yD6lHdJT-lkp@i...) compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250812/202508121448.yD6lHdJT-lkp@i...) 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@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202508121448.yD6lHdJT-lkp@intel.com/ All warnings (new ones prefixed by >>):

...

arch/arm64/kvm/rme.c:740:6: warning: variable 'tmp_page' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] 740 | if (memslot->base_gfn + memslot->npages < end_gfn) { | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/arm64/kvm/rme.c:789:14: note: uninitialized use occurs here 789 | __free_page(tmp_page); | ^~~~~~~~ include/linux/gfp.h:333:41: note: expanded from macro '__free_page' 333 | #define __free_page(page) __free_pages((page), 0) | ^~~~ arch/arm64/kvm/rme.c:740:2: note: remove the 'if' if its condition is always false 740 | if (memslot->base_gfn + memslot->npages < end_gfn) { | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 741 | ret = -EINVAL; | ~~~~~~~~~~~~~~ 742 | goto out; | ~~~~~~~~~ 743 | } | ~ arch/arm64/kvm/rme.c:734:6: warning: variable 'tmp_page' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] 734 | if (!memslot) { | ^~~~~~~~ arch/arm64/kvm/rme.c:789:14: note: uninitialized use occurs here 789 | __free_page(tmp_page); | ^~~~~~~~ include/linux/gfp.h:333:41: note: expanded from macro '__free_page' 333 | #define __free_page(page) __free_pages((page), 0) | ^~~~ arch/arm64/kvm/rme.c:734:2: note: remove the 'if' if its condition is always false 734 | if (!memslot) { | ^~~~~~~~~~~~~~~ 735 | ret = -EFAULT; | ~~~~~~~~~~~~~~ 736 | goto out; | ~~~~~~~~~ 737 | } | ~ arch/arm64/kvm/rme.c:726:23: note: initialize the variable 'tmp_page' to silence this warning 726 | struct page *tmp_page; | ^ | = NULL arch/arm64/kvm/rme.c:798:16: warning: variable 'data_flags' set but not used [-Wunused-but-set-variable] 798 | unsigned long data_flags = 0; | ^ 3 warnings generated.

vim +740 arch/arm64/kvm/rme.c e216f77846eeb7 Steven Price 2025-06-14 715 e216f77846eeb7 Steven Price 2025-06-14 716 static int populate_region(struct kvm *kvm, e216f77846eeb7 Steven Price 2025-06-14 717 phys_addr_t ipa_base, e216f77846eeb7 Steven Price 2025-06-14 718 phys_addr_t ipa_end, e216f77846eeb7 Steven Price 2025-06-14 719 unsigned long data_flags) e216f77846eeb7 Steven Price 2025-06-14 720 { e216f77846eeb7 Steven Price 2025-06-14 721 struct realm *realm = &kvm->arch.realm; e216f77846eeb7 Steven Price 2025-06-14 722 struct kvm_memory_slot *memslot; e216f77846eeb7 Steven Price 2025-06-14 723 gfn_t base_gfn, end_gfn; e216f77846eeb7 Steven Price 2025-06-14 724 int idx; e216f77846eeb7 Steven Price 2025-06-14 725 phys_addr_t ipa = ipa_base; a74f93b7e7c0d8 Steven Price 2025-06-14 726 struct page *tmp_page; e216f77846eeb7 Steven Price 2025-06-14 727 int ret = 0; e216f77846eeb7 Steven Price 2025-06-14 728 e216f77846eeb7 Steven Price 2025-06-14 729 base_gfn = gpa_to_gfn(ipa_base); e216f77846eeb7 Steven Price 2025-06-14 730 end_gfn = gpa_to_gfn(ipa_end); e216f77846eeb7 Steven Price 2025-06-14 731 e216f77846eeb7 Steven Price 2025-06-14 732 idx = srcu_read_lock(&kvm->srcu); e216f77846eeb7 Steven Price 2025-06-14 733 memslot = gfn_to_memslot(kvm, base_gfn); e216f77846eeb7 Steven Price 2025-06-14 734 if (!memslot) { e216f77846eeb7 Steven Price 2025-06-14 735 ret = -EFAULT; e216f77846eeb7 Steven Price 2025-06-14 736 goto out; e216f77846eeb7 Steven Price 2025-06-14 737 } e216f77846eeb7 Steven Price 2025-06-14 738 e216f77846eeb7 Steven Price 2025-06-14 739 /* We require the region to be contained within a single memslot */ e216f77846eeb7 Steven Price 2025-06-14 @740 if (memslot->base_gfn + memslot->npages < end_gfn) { e216f77846eeb7 Steven Price 2025-06-14 741 ret = -EINVAL; e216f77846eeb7 Steven Price 2025-06-14 742 goto out; e216f77846eeb7 Steven Price 2025-06-14 743 } e216f77846eeb7 Steven Price 2025-06-14 744 a74f93b7e7c0d8 Steven Price 2025-06-14 745 tmp_page = alloc_page(GFP_KERNEL); a74f93b7e7c0d8 Steven Price 2025-06-14 746 if (!tmp_page) { a74f93b7e7c0d8 Steven Price 2025-06-14 747 ret = -ENOMEM; e216f77846eeb7 Steven Price 2025-06-14 748 goto out; e216f77846eeb7 Steven Price 2025-06-14 749 } e216f77846eeb7 Steven Price 2025-06-14 750 a74f93b7e7c0d8 Steven Price 2025-06-14 751 mmap_read_lock(current->mm); a74f93b7e7c0d8 Steven Price 2025-06-14 752 e216f77846eeb7 Steven Price 2025-06-14 753 while (ipa < ipa_end) { e216f77846eeb7 Steven Price 2025-06-14 754 struct vm_area_struct *vma; e216f77846eeb7 Steven Price 2025-06-14 755 unsigned long hva; e216f77846eeb7 Steven Price 2025-06-14 756 struct page *page; e216f77846eeb7 Steven Price 2025-06-14 757 kvm_pfn_t pfn; e216f77846eeb7 Steven Price 2025-06-14 758 e216f77846eeb7 Steven Price 2025-06-14 759 hva = gfn_to_hva_memslot(memslot, gpa_to_gfn(ipa)); e216f77846eeb7 Steven Price 2025-06-14 760 vma = vma_lookup(current->mm, hva); e216f77846eeb7 Steven Price 2025-06-14 761 if (!vma) { e216f77846eeb7 Steven Price 2025-06-14 762 ret = -EFAULT; e216f77846eeb7 Steven Price 2025-06-14 763 break; e216f77846eeb7 Steven Price 2025-06-14 764 } e216f77846eeb7 Steven Price 2025-06-14 765 a74f93b7e7c0d8 Steven Price 2025-06-14 766 pfn = gfn_to_pfn_memslot(memslot, gpa_to_gfn(ipa)); e216f77846eeb7 Steven Price 2025-06-14 767 e216f77846eeb7 Steven Price 2025-06-14 768 if (is_error_pfn(pfn)) { e216f77846eeb7 Steven Price 2025-06-14 769 ret = -EFAULT; e216f77846eeb7 Steven Price 2025-06-14 770 break; e216f77846eeb7 Steven Price 2025-06-14 771 } e216f77846eeb7 Steven Price 2025-06-14 772 a74f93b7e7c0d8 Steven Price 2025-06-14 773 page = pfn_to_page(pfn); e216f77846eeb7 Steven Price 2025-06-14 774 e216f77846eeb7 Steven Price 2025-06-14 775 ret = realm_create_protected_data_page(realm, ipa, a74f93b7e7c0d8 Steven Price 2025-06-14 776 page, a74f93b7e7c0d8 Steven Price 2025-06-14 777 tmp_page, e216f77846eeb7 Steven Price 2025-06-14 778 data_flags); a74f93b7e7c0d8 Steven Price 2025-06-14 779 if (ret) { e216f77846eeb7 Steven Price 2025-06-14 780 kvm_release_page_clean(page); e216f77846eeb7 Steven Price 2025-06-14 781 break; a74f93b7e7c0d8 Steven Price 2025-06-14 782 } e216f77846eeb7 Steven Price 2025-06-14 783 e216f77846eeb7 Steven Price 2025-06-14 784 ipa += PAGE_SIZE; a74f93b7e7c0d8 Steven Price 2025-06-14 785 kvm_release_pfn_dirty(pfn); e216f77846eeb7 Steven Price 2025-06-14 786 } e216f77846eeb7 Steven Price 2025-06-14 787 out: a74f93b7e7c0d8 Steven Price 2025-06-14 788 mmap_read_unlock(current->mm); a74f93b7e7c0d8 Steven Price 2025-06-14 789 __free_page(tmp_page); e216f77846eeb7 Steven Price 2025-06-14 790 srcu_read_unlock(&kvm->srcu, idx); e216f77846eeb7 Steven Price 2025-06-14 791 return ret; e216f77846eeb7 Steven Price 2025-06-14 792 } e216f77846eeb7 Steven Price 2025-06-14 793 :::::: The code at line 740 was first introduced by commit :::::: e216f77846eeb7062baa345cea2be0978dea94cc [v8-19-43]arm64: RME: Allow populating initial contents :::::: TO: Steven Price <steven.price@arm.com> :::::: CC: Xu Raoqing <xuraoqing@huawei.com> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki