On 07/17/2014 10:31 PM, cyril...@gmail.com wrote:
> It may prove useful know which Linux distribution version the host machine
> is running when an issue in the guest arises but a user cannot access
> the host.
>
> Signed-off-by: Cyril Bur <cyril....@au1.ibm.com>
> ---
> hw/ppc/spapr.c | 8 +++++++
> target-ppc/kvm.c | 62
> ++++++++++++++++++++++++++++++++++++++++++++++++++++
> target-ppc/kvm_ppc.h | 6 +++++
> 3 files changed, 76 insertions(+)
>
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index 6b48a26..391d47a 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -375,6 +375,14 @@ static void *spapr_create_fdt_skel(hwaddr initrd_base,
> _FDT((fdt_property_string(fdt, "vm,uuid", buf)));
> g_free(buf);
>
> + /*
> + * Add info to the guest FDT to tell it what linux the host is
> + */
> + if (kvmppc_get_linux_host(&buf)) {
> + _FDT((fdt_property_string(fdt, "linux,host", buf)));
> + g_free(buf);
> + }Ouch. What does this do for migration? By exposing it to the guest, you have made it part of the guest ABI, and now you have limited yourself to migrate only when the destination host is identical to the source if you don't want to risk breaking the guest. Without this, it seems feasible to migrate from a machine on an older host to another machine on a newer host. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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