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Old 09-26-2011, 06:43 AM   #1
Jaskaran Singh
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Registered: Sep 2011
Posts: 2

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Inserting break point in guest from qemu using ioctls into kvm


Hey,
We have written a plugin in qemu to handle display driver calls .If the display driver does something which we feel is bad we want the Guest to trap so that in windbg we can know what has caused this condition.Things we have tried to solve this problem are ::
1)Setting trap flag in eflags using getregs and set regs ioctl .But this did not work .The guest behaves like no trap flag is set and windbg has no effect .
2)Second thing that we tried was :
Using KVM_SET_GUEST_DEBUG ioctl :Arguments
setting control as KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_HW_BP | KVM_GUESTDBG_INJECT_BP | KVM_GUESTDBG_SINGLE_STEP;
and debug_reg[0] as rip obtained by doing getregs .and similarly debugreg[7] as flags to enable the rip .But this too did not work.The windbg hangs and nothing works .

Can anyone point me to the right direction .KVM we are using is kvm-kmod-devel-88 .Is there anything regarding this that has been updated in the newer versions .
 
Old 09-26-2011, 07:00 AM   #2
Chuck56
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Registered: Dec 2006
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kvm-kmod-devel-88 is over 2 years old. Since then the userland (qenu-kvm) and kernel code (kvm-kmod) are released separately. You should use the newer packages and see if that helps.
 
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Old 09-26-2011, 07:03 AM   #3
Jaskaran Singh
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Registered: Sep 2011
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Yes,but before that I want to know if this is the correct direction and I have explored the possible options with the older kvm .As migrating to newer kvm and qemu would require some work as the patched that I have made for these older versions might break .In short can you tell me if this is the correct direction and what else can be looked at .
 
  


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