Hello again. I'm making more progress getting KVM going in M5, and
right now I'm trying to figure out why I'm getting an unhandled vm exit
with exit code 0x80000021. According to Intel's manual, something about
the guest state isn't being set up correctly. I dumped the initial
register state for the 0th virtual CPU and noticed that some things
Intel claims are illegal show up there, for instance having paging and
protected mode disabled. I'm assuming there's some cooking done to the
state as presented to KVM to, for instance, substitute V8086 mode for
real mode, etc. I've fixed a number of bugs in M5 that cleaned up some
issues, but I'm hoping somebody with more knowledge can tell me what
illegal state is still there that would make it through the kvms
twiddling and cause VMX to abort. One thing that I know looks funny is
that the limit on the IDT is zero, but I haven't been able to find any
evidence in the manuals that that's considered wrong rather than just a
bad idea. Any help here would be very appreciated!
Gabe
rax 0000000000000000 rbx 0000000000000000 rcx 0000000000000000 rdx
0000000000000000
rsi 0000000000090200 rdi 0000000000000000 rsp 0000000000000000 rbp
0000000000000000
r8 0000000000000000 r9 0000000000000000 r10 0000000000000000 r11
0000000000000000
r12 0000000000000000 r13 0000000000000000 r14 0000000000000000 r15
0000000000000000
rip 0000000000200000 rflags 00000002
cs 0008 (00000000/ffffffff p 1 dpl 0 db 0 s 1 type a l 1 g 1 avl 0)
ds 0010 (00000000/ffffffff p 1 dpl 0 db 1 s 1 type 2 l 0 g 1 avl 0)
es 0010 (00000000/ffffffff p 1 dpl 0 db 1 s 1 type 2 l 0 g 1 avl 0)
ss 0010 (00000000/ffffffff p 1 dpl 0 db 1 s 1 type 2 l 0 g 1 avl 0)
fs 0010 (00000000/ffffffff p 1 dpl 0 db 1 s 1 type 2 l 0 g 1 avl 0)
gs 0010 (00000000/ffffffff p 1 dpl 0 db 1 s 1 type 2 l 0 g 1 avl 0)
tr 0018 (00000000/ffffffff p 1 dpl 0 db 1 s 0 type b l 0 g 1 avl 0)
ldt 0000 (00000000/00000000 p 0 dpl 0 db 0 s 0 type 0 l 0 g 0 avl 0)
gdt 76000/17
idt 0/0
cr0 80000011 cr2 0 cr3 70000 cr4 20 cr8 0 efer 500
--
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
