Re: [RFC V1 4/6] migration: cpr-uri parameter

[Peter Xu <peterx@redhat.com>]

On Sun, Jun 30, 2024 at 12:44:06PM -0700, Steve Sistare wrote:
> Define the cpr-uri migration parameter to specify the URI to which
> CPR vmstate is saved for cpr-transfer mode.
> 
> Signed-off-by: Steve Sistare <steven.sistare@oracle.com>

So I left the idea in my reply to the cover letter to reuse "-cpr-uri" in
qemu cmdline on dst node, and I wonder if it'll also save this one on src
with the same idea.

In general, with cpr-transfer we always stick with unix socket, and only
one pair of it.

When migration starts, cpr_state_save() dumps things and cpr_state_load()
loads things.  Then the socket gets reused on both sides to be the
migration channel.

IIUC we can already reuse QMP command URI on src so we don't need anything
new.  On dst, we may need "-incoming-cpr" to tell QEMU we need to kick off
CPR early loads; it's a pity we don't have way to specify migration mode
there, otherwise IIUC we can even save "-incoming-cpr" but reuse "-incoming".

Thanks,

-- 
Peter Xu