With kvm-44, I thought my kernel was freezing during boot if I gave it
1G of RAM. But, it boots fine with 512M.
So, I instrumented the kernel, and found out that it is just taking a
long time to memset a 58MB area of memory for mem_map[]. It appears to
be taking a mmio_exit for every access of every byte of memory. The end
result is a ~100kbps memset() speed. Yes, 100 kilobytes/sec.
I just tried kvm from git, and the kernel doesn't even get that far. I
see this in debugfs
insn_emulation:1393985
even before I get a single kernel message. And it keeps going up, fast.
I can get the kernel to boot just fine if I give it less than 896MB of
RAM.
kvm-44 boots long enough for me to see a really funky e820 table:
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
BIOS-e820: 00000000000e8000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 00000000fffbd000 (usable)
BIOS-e820: 00000000fffbd000 - 00000000ffff0000 (reserved)
Note that this is with '-m 1G'!! It looks to me like one of those
sections is basically from 0x100000 up to ~4G and *usable*. That
doesn't look right.
Eventually, the kvm-git one just pukes:
exception 13 (33)
rax 0000000000000002 rbx 0000000000002000 rcx 0000000000000000 rdx
0000000000000000
rsi 00000000002a1358 rdi 0000000000099100 rsp 000000000000673a rbp
000000000000673a
r8 0000000000000000 r9 0000000000000000 r10 0000000000000000 r11
0000000000000000
r12 0000000000000000 r13 0000000000000000 r14 0000000000000000 r15
0000000000000000
rip 000000000000fb24 rflags 00033086
cs 9020 (00090200/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
ds 9000 (00090000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
es 9000 (00090000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
ss 9000 (00090000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
fs 9000 (00090000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
gs 9000 (00090000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
tr 0000 (fffbd000/00002088 p 1 dpl 0 db 0 s 0 type b l 0 g 0 avl 0)
ldt 0000 (00000000/0000ffff p 1 dpl 0 db 0 s 0 type 2 l 0 g 0 avl 0)
gdt 8f5c/27
idt 0/3ff
cr0 60000010 cr2 0 cr3 0 cr4 0 cr8 0 efer 0
code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 --> f0 01 f0
03 0e 00 00 00 70 01 70 03 0f 00 00 00 e8 01 e0 03 0c 00 00 00 68 01 60 03 0b 00
Aborted
Any idea how to debug this?
-- Dave
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