On Tue, Sep 09, 2014 at 09:13:38AM -0500, Michael Roth wrote:
> Quoting Michael S. Tsirkin (2014-09-08 11:05:02)
> > commit cc943c36faa192cd4b32af8fe5edb31894017d35
> > pci: Use bus master address space for delivering MSI/MSI-X messages
> > breaks virtio-net for rhel6.[56] x86 guests because they don't
> > enable bus mastering for virtio PCI devices
> >
> > Old guests forgot to enable bus mastering, enable it
> > automatically on DRIVER_OK.
> >
> > Note: we should either back out the original patch from
> > stable or apply this one on top.
>
> I've already backed out the other patch, and it looks we'll have to stick
> with that for now with the release being tomorrow.
That's fine.
> Will queue these back
> up for 2.1.2 though.
> >
> > Cc: qemu-sta...@nongnu.org
> > Reported-by: Greg Kurz <gk...@linux.vnet.ibm.com>
> > Signed-off-by: Jan Kiszka <jan.kis...@siemens.com>
> > Signed-off-by: Michael S. Tsirkin <m...@redhat.com>
> > ---
> > hw/virtio/virtio-pci.c | 2 ++
> > 1 file changed, 2 insertions(+)
> >
> > diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
> > index ddb5da1..af937d2 100644
> > --- a/hw/virtio/virtio-pci.c
> > +++ b/hw/virtio/virtio-pci.c
> > @@ -320,6 +320,8 @@ static void virtio_ioport_write(void *opaque, uint32_t
> > addr, uint32_t val)
> > if ((val & VIRTIO_CONFIG_S_DRIVER_OK) &&
> > !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
> > proxy->flags |= VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
> > +
> > memory_region_set_enabled(&proxy->pci_dev.bus_master_enable_region,
> > + true);
> > }
> > break;
> > case VIRTIO_MSI_CONFIG_VECTOR:
> > --
> > MST
