Alberto Treviño wrote:
I am having a really weird problem. I reported about it earlier (see
http://article.gmane.org/gmane.comp.emulators.kvm.devel/15884) thinking
the problem was with SCSI disks, but that's not the case. Let me try
to explain.
I have a drive that has GRUB and Linux. If I run the following command,
it boots normally, even though the boot flag has been set to off:
qemu-system-x86_64 -m 256
-drive file=hd0.qcow2,if=ide,bus=0,index=0,media=disk,boot=off
How did you install grub on this drive? Is this a distro image or did
you install grub yourself?
Regards,
Anthony Liguori
If I run the following, qemu crashes when GRUB loads:
qemu-system-x86_64 -m 256
-drive file=hd0.qcow2,if=ide,bus=0,index=0,media=disk,boot=on
Qemu reports the following when it crashes:
exception 13 (33)
rax 0000000000000000 rbx 0000000000000800 rcx 0000000000000000 rdx
00000000000000e0
rsi 00000000ffff7d98 rdi 000000000008f788 rsp 0000000000002018 rbp
0000000000000001
r8 0000000000000000 r9 0000000000000000 r10 0000000000000000 r11
0000000000000000
r12 0000000000000000 r13 0000000000000000 r14 0000000000000000 r15
0000000000000000
rip 0000000000000003 rflags 00033202
cs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
ds 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
es 0800 (00008000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
ss 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
fs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
gs 0000 (00000000/0000ffff 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 fb1f2/30
idt 0/3ff
cr0 10 cr2 0 cr3 0 cr4 0 cr8 0 efer 0
code: 53 ff 00 --> f0 53 ff 00 f0 53 ff 00 f0 53 ff 00 f0 53 ff 00 f0 53
ff 00 f0 53 ff 00 f0 53 ff 00 f0 a5 fe 00 f0 87 e9 00 f0 53 ff 00 f0 53
ff 00 f0 53 ff
Aborted
If I change the interface to SCSI and set the boot flag to off, Qemu
can't find a valid boot drive and does not boot. If I change the
interface to SCSI and set the boot flag to on, I get the same crash.
According to Anthony Liguori's original extboot post, "boot=on" turns on
the extboot code, so my problem is the combination of extboot and GRUB.
A response on my original post suggested this might be a real mode
issue. However, it seems more of an extboot problem with some of the
calls from GRUB.
What's the status of the extboot in C project? Perhaps I could try that
to see if it fixes the problem. Does anyone have any other
suggestions?
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