https://bugzilla.kernel.org/show_bug.cgi?id=42980 Avi Kivity <avi@xxxxxxxxxx> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |avi@xxxxxxxxxx --- Comment #1 from Avi Kivity <avi@xxxxxxxxxx> 2012-03-28 13:03:25 --- 0: 89 d0 mov %edx,%eax 2: 8d 4c ff 0c lea 0xc(%rdi,%rdi,8),%ecx 6: 4d 89 e0 mov %r12,%r8 9: 48 d3 e8 shr %cl,%rax c: 4c 03 45 a8 add -0x58(%rbp),%r8 10: 25 ff 01 00 00 and $0x1ff,%eax 15: 41 39 f6 cmp %esi,%r14d 18: 89 45 bc mov %eax,-0x44(%rbp) 1b: 89 c0 mov %eax,%eax 1d: 49 8d 04 c0 lea (%r8,%rax,8),%rax 21: 48 89 45 b0 mov %rax,-0x50(%rbp) 25: 0f 84 e1 00 00 00 je 0x10c 2b: 4c 8b 00 mov (%rax),%r8 2e: 41 f6 c0 01 test $0x1,%r8b 32: 74 40 je 0x74 34: 4c 8b 0d 89 80 01 00 mov 0x18089(%rip),%r9 # 0x180c4 3b: 4d 89 c2 mov %r8,%r10 Appears to be __direct_map()'s if (!is_shadow_present_pte(*iterator.sptep)) { u64 base_addr = iterator.addr; %rax is 0xffff87ffffffffff. That is one less than the base of the direct map of all physical memory. So it looks like the code static bool shadow_walk_okay(struct kvm_shadow_walk_iterator *iterator) { if (iterator->level < PT_PAGE_TABLE_LEVEL) return false; iterator->index = SHADOW_PT_INDEX(iterator->addr, iterator->level); iterator->sptep = ((u64 *)__va(iterator->shadow_addr)) + iterator->index; return true; } saw iterator->shadow_addr == -1ULL. That might be INVALID_PAGE assigned to pae_root (but that is masked out in shadow_walk_init()) or a stray -1 due to a completely unrelated bug. Anything interesting about how this was triggered? -- Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are watching the assignee of the bug. -- 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
