Re: [libvirt-users] [Qemu-devel] [PATCH v2] hmp: allow cpu index for "info lapic"

19 Jul 2017


      On Wed, 19 Jul 2017 16:48:23 +0800 (CST)
<wang.yi59@zte.com.cn> wrote:
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* wang.yi59@zte.com.cn (wang.yi59@zte.com.cn) wrote:
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Hi Eduardo,
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Thank you for your reply!
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On Mon, Jul 17, 2017 at 09:49:37PM -0400, Yi Wang wrote:
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Add [vcpu] index support for hmp command "info lapic", which is
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useful when debugging ipi and so on. Current behavior is not
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changed when the parameter isn't specified.
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Signed-off-by: Yi Wang <wang.yi59@zte.com.cn>
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Signed-off-by: Yun Liu <liu.yunh@zte.com.cn>
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We have 8 monitor commands (see below) that use the CPU set by
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the "cpu" command (mon_get_cpu()) as input.  Why is "info lapic"
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special?
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When we debugging a problem of ipi, we wanted to verify lapic info
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on each vCPU, but we found that we could only get vCPU 0's lapic
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through "info lapic", so we supposed this patch could help those
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who have the same problem as us.
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I think Eduardo's point is that you can already do:
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cpu 0
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info lapic
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cpu 1
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info lapic
Yes, I get it, thank you.
The reason of the problem we met is that we use "virsh qemu-monitor-command",
so the 'cpu' command didn't work.
you can try to use qmp interface directly which supports specifying cpu for monitor commands:
qemu supports:

 -- Command: human-monitor-command

     Execute a command on the human monitor and return the output.

     Arguments:
     'command-line: string'
          the command to execute in the human monitor
     'cpu-index: int' (optional)
          The CPU to use for commands that require an implicit CPU

maybe "virsh qemu-monitor-command" can also do it, CCing libvirt list
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Best wishes
Yi Wang

Igor Mammedov

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