Jan Kiszka wrote:
Nicholas Amon wrote:
So now I can step instruction but my breakpoints do not work. I have
verified that disabling kvm restores the breakpoint functionality. Any
suggestions?
What kind of breakpoints, hardware-assisted or normal BPs? Are you
trying to break into real-mode code (as stated below - BTW, top-postings
should be avoided!) that happens to run on a non-brand-new Intel host? I
never fully tested how well guest debugging works if KVM has to emulate
instructions, and I wouldn't be surprised if there are "limitations".
Jan
Jan Kiszka wrote:
Hi Nicholas,
please don't drop CCs on reply.
Nicholas Amon wrote:
Hi Jan,
Thanks for responding. Yes, I am able to step instruction when I
disable kvm w/ the no-kvm option. My host kernel is 64bit 2.6.27 and
the program that I am debugging is 32 bit but starts in real mode. But
the KVM module I am running is from kvm-88. Is there anyway I can check
the version definitively?
kvm modules issue a message when being loaded, check your kernel log.
qemu-kvm gives you the version via -version.
OK, the problems you see is likely related to the very old versions you
use. Update to recent kvm-kmod (2.6.32 series) and qemu-kvm (0.12
series) and retry.
Jan
Thanks,
Nicholas
Jan Kiszka wrote:
Jan Kiszka wrote:
Nicholas Amon wrote:
Hi All,
I am trying to single-step through my kernel using qemu and kvm. I have
run qemu via: qemu-system-x86_64 -s -S -hda
/home/nickamon/lab1/obj/kernel.img and also connected to the process
using gdb.
Problem is that whenever I try and step instruction, it seems to resume
my kernel rather than allowing me to progress instruction by
instruction. I have built the kvm snapshot from git and still no luck.
Tried following the code for a few hours and have no luck. Any
suggestions?
What's you host kernel or kvm-kmod version?
...and does -no-kvm make any difference (except that it's much slower)?
Jan
My apologies for the late response. Normal breakpoints and yes I am
breaking in real mode. This isn't a big issue for me since I am able to
break when I disable kvm. So basically I disable kvm when I want to
debug and enable it during normal execution. Thanks for all your help.
Nick
Nicholas Amon
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