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Dark Byte
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Joined: 09 May 2003
Posts: 25785
Location: The netherlands
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 Posted: Thu Jul 03, 2014 5:20 pm Post subject: |
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you could try it
but yes, it's not just the vmcalls
e.g: VMCALL_REDIRECTINT1 , it doesn't only store those flags in the current cpu context, but it also means that whenever interrupt 1 is raised, it changes CS:RIP to the given location instead of executing the interrupt (and you do have to emulate the correct behavior (e.g disabling TF )
same for CR3 callbacks and ultimap which sets the tracing flag in the debug ctrl msr to true/false
someone still needs to edit those sections
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tomerminator
Newbie cheater
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Joined: 20 Nov 2024
Posts: 10
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| Posted: Sun Dec 22, 2024 8:02 am Post subject: |
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| buraktamturk wrote: | | Dark Byte wrote: | it looks like vmlaunch fails due to incorrect parameters so I'll check it out (I fixed the issue with the weird exception, it was stack corruption)
also, a tip for debugging with serial:
open a new terminal window or tab
type in tty, write down the path and then sleep 10000000
then just launch kvm with parameter -serial pathoftty (e.g: -serial /dev/pts/3 )
keyboard input is accepted
(also found a small bug in kvm that under normal usage should never cause any issues, but if vmlaunch fails, it returns one byte later than it should) |
I've already attached a pts device to my guest, but i don't know how to attach to the pts from the console. (All i did to get previous debug output from dbvm was "cat /dev/pts/3" and "echo 1 > /dev/pts/3") Searched over internet but i used wrong keywords i think.
I think i would better to port dbvm to kvm as a db kvm extensions or something like, I would learn a lot and the possibility to manipulate the guest from host system is a awesome idea i think.
I've started a couple days ago but i didn't have much time for improving and understanding it. Do not know where to place codes to how to get int 1 redirected. Injecting interrupt 1 from host is seems easy, redirecting interrupt 1 to somewhere from kvm would be possible, just the coder need to place the code to right function, and i don't have that capacity.
EDIT: I think it is possible emulate all of the dbvm vmcall's at here, including va to pa, and read/write to pa addresses. KVM has all of these functions and they are working very well. |
reviving a thread from a millions years ago. were you able to make it work? did you succeed running DBVM on KVM?. facing the same issue with the freezes. |
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