On 08/16/2010 02:37 AM, Mohammed Gamal wrote:
Here is a full trace of a MINIX guest since bootup. Looks like we get
stuck somewhere in the BIOS.
https://docs.google.com/leaf?id=0B9UodZT1IuENMzJhNWQxM2YtYzE3YS00YWY4LTk2YTgtZWY3ODNhMWUxMDkx&sort=name&layout=list&num=50
qemu-system-x86-28953 [000] 1927.399942: kvm_inj_virq: irq 16
qemu-system-x86-28953 [000] 1927.399949:
kvm_inject_realmode_interrupt: cs=c000
qemu-system-x86-28953 [000] 1927.399951:
kvm_inject_realmode_interrupt: eip=40a3
qemu-system-x86-28953 [000] 1927.399957:
kvm_inject_realmode_interrupt: cs=c000
qemu-system-x86-28953 [000] 1927.399958:
kvm_inject_realmode_interrupt: eip=8339
qemu-system-x86-28953 [000] 1927.399960: kvm_entry: vcpu 0
qemu-system-x86-28953 [000] 1927.399965: kvm_exit: reason
EXCEPTION_NMI rip 0x8339
qemu-system-x86-28953 [000] 1927.399966: kvm_page_fault: address
c8339 error_code 1d
qemu-system-x86-28953 [000] 1927.399970: kvm_entry: vcpu 0
qemu-system-x86-28953 [000] 1927.399975: kvm_exit: reason
IO_INSTRUCTION rip 0x67d9
qemu-system-x86-28953 [000] 1927.399976: kvm_pio: pio_read at 0x3c4
size 2 count 1
qemu-system-x86-28953 [000] 1927.399985: kvm_entry: vcpu 0
qemu-system-x86-28953 [000] 1927.399991: kvm_exit: reason
EXCEPTION_NMI rip 0x3d4
This is bogus, it's in the middle of an instruction:
f93d1: 2e 67 8b 9a 00 00 f1 addr32 mov %cs:-0xf0000(%edx),%bx
f93d8: ff
f93d9: 66 0f b7 eb movzwl %bx,%ebp
Everything after that is invalid.
So we need to know how we got to rip = 0x3d4, it looks like an I/O port
used by vga. Please rerun with emulation on all real mode instructions.
qemu-system-x86-28953 [000] 1927.399992: kvm_page_fault: address
f93d4 error_code 1d
qemu-system-x86-28953 [000] 1927.399996: kvm_entry: vcpu 0
qemu-system-x86-28953 [000] 1927.400000: kvm_exit: reason
EXCEPTION_NMI rip 0x0
qemu-system-x86-28953 [000] 1927.400003: kvm_inj_exception: #DB (0x0)
qemu-system-x86-28953 [000] 1927.400005:
kvm_inject_realmode_interrupt: cs=fff1
qemu-system-x86-28953 [000] 1927.400006:
kvm_inject_realmode_interrupt: eip=0
qemu-system-x86-28953 [000] 1927.400011:
kvm_inject_realmode_interrupt: cs=f000
qemu-system-x86-28953 [000] 1927.400012:
kvm_inject_realmode_interrupt: eip=ff53
qemu-system-x86-28953 [000] 1927.400014: kvm_entry: vcpu 0
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
--
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
