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    SubjectRe: virtio-pci new configuration proposal
    On Mon, Nov 07, 2011 at 03:46:23PM +1030, Rusty Russell wrote:
    > On Sun, 6 Nov 2011 23:38:49 +0200, "Michael S. Tsirkin" <mst@redhat.com> wrote:
    > > On Sun, Nov 06, 2011 at 10:24:57PM +0200, Sasha Levin wrote:
    > > > On Sun, 2011-11-06 at 09:30 +0200, Michael S. Tsirkin wrote:
    > > > > On Fri, Nov 04, 2011 at 04:53:05PM +0200, Sasha Levin wrote:
    > > > > > > I guess my assumption is that most options will be in use,
    > > > > > > not discarded dead-ends.
    > > > > >
    > > > > > I don't know about that. 64 bit features would be pretty rare for now -
    > > > > > and I don't think that setting the alignment will be also enabled by
    > > > > > default.
    >
    > The truth is somewhere between. New features tend to be used, and
    > importantly, they have to be offered.
    >
    > Anyway, the *per-device* config part will be contiguous. So we're
    > talking about pci-specific features.
    >
    > So far, the only three things make sense to have in a capability list:
    > MSI-X, the upper 32 feature bits, and the per-device config.
    >
    > Thanks,
    > Rusty.

    You mean the queue # to MSI-X vector mapping?
    One thing to remember is that it must be in the same type of BAR as
    the queue selection, since by PCI rules MMIO writes aren't I think
    ordered with PIO writes (it doesn't matter with KVM but might
    with another hypervisor).

    --
    MST


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