[Qemu-devel] PING: [PATCH] backends/hostmem: Ignore ENOSYS while setting MPOL_DEFAULT

[Pavel Fedin <p.fedin@samsung.com>]

 Hello! No news for a long time, we are at RC stage. Could we get this in?

Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia

> -----Original Message-----
> From: qemu-devel-bounces+p.fedin=samsung.com@nongnu.org [mailto:qemu-devel-
> bounces+p.fedin=samsung.com@nongnu.org] On Behalf Of Eduardo Habkost
> Sent: Tuesday, October 27, 2015 8:32 PM
> To: Pavel Fedin
> Cc: 'Paolo Bonzini'; qemu-devel@nongnu.org
> Subject: Re: [Qemu-devel] [PATCH] backends/hostmem: Ignore ENOSYS while setting MPOL_DEFAULT
> 
> On Tue, Oct 27, 2015 at 03:51:31PM +0300, Pavel Fedin wrote:
> > Currently hostmem backend fails if CONFIG_NUMA is enabled for the qemu
> > (default), but NUMA is not supported by the kernel. This makes it
> > impossible to use ivshmem in such configurations.
> >
> > This patch fixes the problem by ignoring ENOSYS error if policy is set to
> > MPOL_DEFAULT. This way the code behaves in the same way as if CONFIG_NUMA
> > was not defined. qemu will still fail if the user specifies some other
> > policy, so that the user knows it.
> >
> > Signed-off-by: Pavel Fedin <p.fedin@samsung.com>
> 
> Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
> 
> Thanks. Applied to numa tree, with the following indentation fix:
> 
> diff --git a/backends/hostmem.c b/backends/hostmem.c
> index 94a4ac0..1b4eb45 100644
> --- a/backends/hostmem.c
> +++ b/backends/hostmem.c
> @@ -315,7 +315,7 @@ host_memory_backend_memory_complete(UserCreatable *uc, Error **errp)
>                    maxnode ? backend->host_nodes : NULL, maxnode + 1, flags)) {
>              if (backend->policy != MPOL_DEFAULT || errno != ENOSYS) {
>                  error_setg_errno(errp, errno,
> -                             "cannot bind memory to host NUMA nodes");
> +                                 "cannot bind memory to host NUMA nodes");
>                  return;
>              }
>          }
> 
> > ---
> >  backends/hostmem.c | 6 ++++--
> >  1 file changed, 4 insertions(+), 2 deletions(-)
> >
> > diff --git a/backends/hostmem.c b/backends/hostmem.c
> > index 41ba2af..94a4ac0 100644
> > --- a/backends/hostmem.c
> > +++ b/backends/hostmem.c
> > @@ -313,9 +313,11 @@ host_memory_backend_memory_complete(UserCreatable *uc, Error **errp)
> >          assert(maxnode <= MAX_NODES);
> >          if (mbind(ptr, sz, backend->policy,
> >                    maxnode ? backend->host_nodes : NULL, maxnode + 1, flags)) {
> > -            error_setg_errno(errp, errno,
> > +            if (backend->policy != MPOL_DEFAULT || errno != ENOSYS) {
> > +                error_setg_errno(errp, errno,
> >                               "cannot bind memory to host NUMA nodes");
> > -            return;
> > +                return;
> > +            }
> >          }
> >  #endif
> >          /* Preallocate memory after the NUMA policy has been instantiated.
> > --
> > 1.9.5.msysgit.0
> >
> >
> 
> --
> Eduardo