On Sat, Dec 13, 2014 at 1:08 AM, Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote: > > > On 12/12/2014 22:39, Andy Lutomirski wrote: >> KVM internal error. Suberror: 3 >> extra data[0]: 80000202 >> extra data[1]: 31 >> EAX=8be4df61 EBX=8be4df61 ECX=3ff6002c EDX=11d293ca >> ESI=3f08e408 EDI=3e82df7c EBP=3e82deb8 ESP=3e82de7c >> EIP=3ff51206 EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0 >> ES =0018 00000000 ffffffff 00c09300 DPL=0 DS [-WA] >> CS =0010 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA] >> SS =0018 00000000 ffffffff 00c09300 DPL=0 DS [-WA] >> DS =0018 00000000 ffffffff 00c09300 DPL=0 DS [-WA] >> FS =0000 92c2c700 ffffffff 00c00000 >> GS =0000 3ec00000 ffffffff 00c00000 >> LDT=0000 00000000 ffffffff 00c00000 >> TR =0040 3ec11440 00002087 00008b00 DPL=0 TSS32-busy >> GDT= 04c43171 00000020 >> IDT= ff57a000 00000fff >> CR0=00050033 CR2=022e5000 CR3=0009c000 CR4=000407f0 >> DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 >> DR3=0000000000000000 >> DR6=00000000ffff0ff0 DR7=0000000000000400 >> EFER=0000000000000801 >> Code=0f be 11 29 d0 5b 5d c3 55 89 e5 8b 45 08 5d 8b 50 04 8b 00 <c3> >> 55 89 e5 8b 45 0c 8b 55 10 8b 4d 08 89 01 89 51 04 5d c3 55 31 c0 89 >> e5 5d c3 55 89 e5 >> >> I deliberately triggered a guest bug, but I didn't expect this >> failure. I think that the issue is that an NMI was delivered using a >> bogus IDT, but I think it should have been cleanly promoted to a >> double fault and then a triple fault. Is this a KVM bug? > > Yeah, it should have triggered a triple fault. This looks like a failed > vmentry, due to invalid state in the VMCS. It would be great to have a > reproducer using kvm-unit-tests, or failing that a reproducer kernel > module for the guest. > I spent a few minutes poking at this with no luck. Here's how I can reproduce it: Build a guest kernel with CONFIG_EFI_MIXED=y (full config attached). Boot it with: virtme-run --kimg arch/x86/boot/bzImage --qemu-opts -pflash ~/apps/ovmf/32/OVMF.fd -m 1024 Where OVMF.fd is from here: http://sourceforge.net/projects/edk2/files/OVMF/OVMF-IA32-r15214.zip/download Type this: bash-4.3# cd /sys/firmware/efi/vars/ bash-4.3# perf record -o /dev/null cat */raw_var You may need to repeat the last part a couple times. Adding -F 10000 to the perf command may help. The guest bug is that the guest has disabled interrupts, exited long mode, loaded a 32-bit GDT, left the IDT alone, and received an NMI. --Andy -- 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
