Re: [Qemu-devel] [Question] dump memory when host pci device is used by guest

[Wen Congyang]

于 2011/10/7 18:16, Jan Kiszka 写道:
> On 2011-10-07 11:46, Wen Congyang wrote:
> > Currently, virsh dump uses monitor command migrate to dump guest's memory
> > to file, and we can use crash to analyze the file.
> >
> > Unfortunately, virsh dump can not work if guest uses host pci device. The
> > reason is that the device's status is also needed to migrate to remote machine,
> > and the host pci device's status is not stored in qemu. So it is unmigratable.
> >
> > I think we can  we can add a option to qmp command migrate(eg: skip) to allow
> > the user to skip the check, and this option should be used only when dumping
> > the guest's memory.
>
> Why not simply attach gdb? That works independently of migration.

If qemu has some problem, we can use gdb to debug it. But if guest os 
has problem
(eg:kernel panic and kdump does not work), we should dump guest's memory 
and use
crash to analyze.

Thanks
Wen Congyang


> Jan