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Re: [PATCH] virtio_ring: use smp_store_mb

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On Thu, Dec 17, 2015 at 04:33:44PM +0200, Michael S. Tsirkin wrote:
> On Thu, Dec 17, 2015 at 02:57:26PM +0100, Peter Zijlstra wrote:
> > 
> > You could of course go fix that instead of mutilating things into
> > sort-of functional state.
> 
> Yes, we'd just need to touch all architectures, all for
> the sake of UP which almost no one uses.
> Basically, we need APIs that explicitly are
> for talking to another kernel on a different CPU on
> the same SMP system, and implemented identically
> between CONFIG_SMP and !CONFIG_SMP on all architectures.
> 
> Do you think this is something of general usefulness,
> outside virtio?

I'm not aware of any other case, but if there are more parts of virt
that need this then I see no problem adding it.

That is, virt in general is the only use-case that I can think of,
because this really is an artifact of interfacing with an SMP host while
running an UP kernel.

But I'm really not familiar with virt, so I do not know if there's more
sites outside of virtio that could use this.

Touching all archs is a tad tedious, but its fairly straight forward.
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[PATCH] virtio_ring: use smp_store_mb "Michael S. Tsirkin" <mst@redhat.com> - 2015-12-17 11:40 +0100
  Re: [PATCH] virtio_ring: use smp_store_mb Peter Zijlstra <peterz@infradead.org> - 2015-12-17 12:00 +0100
    Re: [PATCH] virtio_ring: use smp_store_mb "Michael S. Tsirkin" <mst@redhat.com> - 2015-12-17 14:20 +0100
      Re: [PATCH] virtio_ring: use smp_store_mb Peter Zijlstra <peterz@infradead.org> - 2015-12-17 15:00 +0100
        Re: [PATCH] virtio_ring: use smp_store_mb "Michael S. Tsirkin" <mst@redhat.com> - 2015-12-17 15:40 +0100
          Re: [PATCH] virtio_ring: use smp_store_mb Peter Zijlstra <peterz@infradead.org> - 2015-12-17 15:40 +0100
            Re: [PATCH] virtio_ring: use smp_store_mb "Michael S. Tsirkin" <mst@redhat.com> - 2015-12-17 15:50 +0100
            new barrier type for paravirt (was Re: [PATCH] virtio_ring: use  smp_store_mb) "Michael S. Tsirkin" <mst@redhat.com> - 2015-12-20 10:30 +0100
              Re: [Xen-devel] new barrier type for paravirt (was Re: [PATCH]  virtio_ring: use smp_store_mb) Andrew Cooper <andrew.cooper3@citrix.com> - 2015-12-20 18:10 +0100
                Re: [Xen-devel] new barrier type for paravirt (was Re: [PATCH]  virtio_ring: use smp_store_mb) Peter Zijlstra <peterz@infradead.org> - 2015-12-20 21:10 +0100
                Re: [Xen-devel] new barrier type for paravirt (was Re: [PATCH]  virtio_ring: use smp_store_mb) "Michael S. Tsirkin" <mst@redhat.com> - 2015-12-21 08:20 +0100
                [PATCH RFC] smp_store_mb should use smp_mb "Michael S. Tsirkin" <mst@redhat.com> - 2015-12-21 08:30 +0100
              Re: [Xen-devel] new barrier type for paravirt (was Re: [PATCH] virtio_ring:  use smp_store_mb) David Vrabel <david.vrabel@citrix.com> - 2015-12-21 11:50 +0100
                Re: [Xen-devel] new barrier type for paravirt (was Re: [PATCH]  virtio_ring: use smp_store_mb) "Michael S. Tsirkin" <mst@redhat.com> - 2015-12-21 13:00 +0100
                Re: [Qemu-devel] [Xen-devel] new barrier type for paravirt (was Re:  [PATCH] virtio_ring: use smp_store_mb) Stefano Stabellini <stefano.stabellini@eu.citrix.com> - 2015-12-21 16:00 +0100
  Re: [PATCH] virtio_ring: use smp_store_mb Peter Zijlstra <peterz@infradead.org> - 2015-12-17 12:30 +0100
    Re: [PATCH] virtio_ring: use smp_store_mb "Michael S. Tsirkin" <mst@redhat.com> - 2015-12-17 14:30 +0100
      Re: [PATCH] virtio_ring: use smp_store_mb Peter Zijlstra <peterz@infradead.org> - 2015-12-17 15:10 +0100
        Re: [PATCH] virtio_ring: use smp_store_mb "Michael S. Tsirkin" <mst@redhat.com> - 2015-12-17 15:40 +0100
          Re: [PATCH] virtio_ring: use smp_store_mb Peter Zijlstra <peterz@infradead.org> - 2015-12-17 16:10 +0100
            Re: [PATCH] virtio_ring: use smp_store_mb Will Deacon <will.deacon@arm.com> - 2015-12-17 17:00 +0100
              Re: [PATCH] virtio_ring: use smp_store_mb "Michael S. Tsirkin" <mst@redhat.com> - 2015-12-17 20:30 +0100

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