Re: [PATCH 0/2] Postcopy migration and vhost-user errors

[Prasad Pandit]

On Sun, 21 Jul 2024 at 01:11, Michael S. Tsirkin <mst@redhat.com> wrote:
> > > > On Wed, Jul 17, 2024 at 04:55:52AM -0400, Michael S. Tsirkin wrote:
> > > > > I just want to understand how we managed to have two threads
> > > > > talking in parallel. BQL is normally enough, which path
> > > > > manages to invoke vhost-user with BQL not taken?
> > > > > Just check BQL taken on each vhost user invocation and
> > > > > you will figure it out.
> > > >
> > > OK, so postcopy_ram_ things run without the BQL?
> >
> > There are a lot of postcopy_ram_* functions, I didn't check all of them but
> > I think it's true in this case.  Thanks.
> >
> So pls document this in the commit log.

* ie. IIUC, if we take BQL in postcop_ram_* functions, we don't need
this 'vhost_user_request_reply_lock patch'? I'll check the
postcopy_ram_* functions to see what's happening there.

Thank you.
---
  - Prasad