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Re: [libvirt] [PATCH 0/3 v4] use qemu's dump-guest-meory when vm uses host device



Hi, All

The qemu's patch has been applied to QMP tree. I think we
can start this work now.

Thanks
Wen Congyang

At 04/20/2012 03:20 PM, Wen Congyang Wrote:
> Currently, we use migrate to dump guest's memory. There is one
> restriction in migrate command: the device's status should be
> stored in qemu because the device's status should be passed to
> target machine.
> 
> If we passthrough a host device to guest, the device's status
> is stored in the real device. So migrate command will fail.
> 
> We usually use dump when guest is panicked. So there is no need
> to store device's status in the vmcore.
> 
> qemu will have a new monitor command dump-guest-memory to dump
> guest memory, but it doesn't support async now(it will support
> later when the common async API is implemented).
> 
> So I use dump-guest-memory only when the guest uses host device
> in this patchset.
> 
> Note: the patchset for qemu is still queued. Luiz has acked,
> but he said he does not wait an ACK from Jan and/or Anthony.
> 
> Changes from v3 to v4:
> 1. allow the user to specify the core file's format
> 
> Changes from v2 to v3:
> 1. qemu supports the fd that is associated with a pipe, socket, or FIFO.
>    So pass a pipe fd to qemu and O_DIRECT can work now.
> 
> Change from v1 to v2:
> 1. remove the implemention for text mode.
> 
> Wen Congyang (3):
>   qemu: implement qemu's dump-guest-memory
>   qemu: allow the client to choose the vmcore's format
>   virsh: allow the user to specify vmcore's format
> 
>  include/libvirt/libvirt.h.in |    1 +
>  src/qemu/qemu_domain.c       |    1 +
>  src/qemu/qemu_domain.h       |    1 +
>  src/qemu/qemu_driver.c       |   54 +++++++++++++++++++++++++++++++----------
>  src/qemu/qemu_monitor.c      |   38 +++++++++++++++++++++++++++++
>  src/qemu/qemu_monitor.h      |   12 +++++++++
>  src/qemu/qemu_monitor_json.c |   35 +++++++++++++++++++++++++++
>  src/qemu/qemu_monitor_json.h |    6 ++++
>  tools/virsh.c                |    3 ++
>  tools/virsh.pod              |    5 +++-
>  10 files changed, 142 insertions(+), 14 deletions(-)
> 
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