is_hwpoison_address accesses the page table, so the caller must hold current->mm->mmap_sem in read mode. So fix its usage in hav_to_pfn of kvm accordingly. Comments on is_hwpoison_address are added to remind other users. Reported-by: Avi Kivity <avi@xxxxxxxxxx> Signed-off-by: Huang Ying <ying.huang@xxxxxxxxx> --- mm/memory-failure.c | 3 +++ virt/kvm/kvm_main.c | 3 ++- 2 files changed, 5 insertions(+), 1 deletion(-) --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1298,6 +1298,9 @@ done: return ret; } +/* + * The caller must hold current->mm->mmap_sem in read mode. + */ int is_hwpoison_address(unsigned long addr) { pgd_t *pgdp; --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -955,12 +955,13 @@ static pfn_t hva_to_pfn(struct kvm *kvm, if (unlikely(npages != 1)) { struct vm_area_struct *vma; + down_read(¤t->mm->mmap_sem); if (is_hwpoison_address(addr)) { + up_read(¤t->mm->mmap_sem); get_page(hwpoison_page); return page_to_pfn(hwpoison_page); } - down_read(¤t->mm->mmap_sem); vma = find_vma(current->mm, addr); if (vma == NULL || addr < vma->vm_start || -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html