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[Xen-devel] Re: domain_pause_for_debugger not pausing multiple vcpus

from [Kip Macy] [Permanent Link][Original]
To: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] Re: domain_pause_for_debugger not pausing multiple vcpus
From: Kip Macy <kip.macy@xxxxxxxxx>
Date: Sat, 3 Dec 2005 23:46:25 -0600
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Never mind. I wasn't setting the current_inferior to the VCPU that hit the breakpoint, thus causing the eip to not be decremented. At least on a uniprocessor, debugging an MP guest works correctly now.

Sorry for the noise.


             -Kip

On 12/3/05, Kip Macy <kip.macy@xxxxxxxxx> wrote:
Debugging an MP guest doesn't work. It appears that if a vcpu other than 0 hits an int3 it doesn't get paused.

If the comment in domain_pause_for_debugger is correct (below), this function is completely inappropriate for breakpoint debugging.

   NOTE: Thise does not synchronously pause the domain. The debugger
   must issue a PAUSEDOMAIN command to ensure that all execution
   has ceased and guest state is committed to memory.

What is the correct way to synchronously deschedule a domain? Replacing vcpu_sleep_nosync with vcpu_sleep_sync causes dom0 to lock up when hitting a breakpoint.


Thanks.


             -Kip




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