[Qemu-devel] Re: acpi_piix4: expose no_hotplug attribute via i/o port

["Michael S. Tsirkin" <mst@redhat.com>]

On Wed, Jan 05, 2011 at 06:00:00PM +0200, Michael S. Tsirkin wrote:
> On Wed, Dec 08, 2010 at 03:11:36PM -0200, Marcelo Tosatti wrote:
> > 
> > On top of "add hotplug opt-out option for devices" patchset 
> > http://www.mail-archive.com/qemu-devel@nongnu.org/msg46953.html.
> > 
> > Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
> 
> I put this patchset on my tree - want me to queue this
> one too or prefer to merge through your tree?
> Not sure how to test this one though, but I can
> test that piix still works :)

Or if you prefer to tunnel them all through your tree
I can drop them from mine ... ah the agony of choice.

> > diff --git a/hw/acpi_piix4.c b/hw/acpi_piix4.c
> > index 1990424..4d099e3 100644
> > --- a/hw/acpi_piix4.c
> > +++ b/hw/acpi_piix4.c
> > @@ -38,6 +38,7 @@
> >  #define PROC_BASE 0xaf00
> >  #define PCI_BASE 0xae00
> >  #define PCI_EJ_BASE 0xae08
> > +#define PCI_RMV_BASE 0xae0c
> >  
> >  #define PIIX4_CPU_HOTPLUG_STATUS 4
> >  #define PIIX4_PCI_HOTPLUG_STATUS 2
> > @@ -76,6 +77,7 @@ typedef struct PIIX4PMState {
> >      /* for pci hotplug */
> >      struct gpe_regs gpe;
> >      struct pci_status pci0_status;
> > +    uint32_t pci0_hotplug_enable;
> >  } PIIX4PMState;
> >  
> >  static void piix4_acpi_system_hot_add_init(PCIBus *bus, PIIX4PMState *s);
> > @@ -326,6 +328,25 @@ static const VMStateDescription vmstate_acpi = {
> >      }
> >  };
> >  
> > +static void piix4_update_hotplug(PIIX4PMState *s)
> > +{
> > +    PCIDevice *dev = &s->dev;
> > +    BusState *bus = qdev_get_parent_bus(&dev->qdev);
> > +    DeviceState *qdev, *next;
> > +
> > +    s->pci0_hotplug_enable = 0;
> > +
> > +    QLIST_FOREACH_SAFE(qdev, &bus->children, sibling, next) {
> > +        PCIDeviceInfo *info = container_of(qdev->info, PCIDeviceInfo, qdev);
> > +        PCIDevice *pdev = DO_UPCAST(PCIDevice, qdev, qdev);
> > +        int slot = PCI_SLOT(pdev->devfn);
> > +
> > +        if (!info->no_hotplug) {
> > +            s->pci0_hotplug_enable |= (1 << slot);
> > +        }
> > +    }
> > +}
> > +
> >  static void piix4_reset(void *opaque)
> >  {
> >      PIIX4PMState *s = opaque;
> > @@ -340,6 +361,7 @@ static void piix4_reset(void *opaque)
> >          /* Mark SMM as already inited (until KVM supports SMM). */
> >          pci_conf[0x5B] = 0x02;
> >      }
> > +    piix4_update_hotplug(s);
> >  }
> >  
> >  static void piix4_powerdown(void *opaque, int irq, int power_failing)
> > @@ -594,6 +618,18 @@ static void pciej_write(void *opaque, uint32_t addr, uint32_t val)
> >      PIIX4_DPRINTF("pciej write %x <== %d\n", addr, val);
> >  }
> >  
> > +static uint32_t pcirmv_read(void *opaque, uint32_t addr)
> > +{
> > +    PIIX4PMState *s = opaque;
> > +
> > +    return s->pci0_hotplug_enable;
> > +}
> > +
> > +static void pcirmv_write(void *opaque, uint32_t addr, uint32_t val)
> > +{
> > +    return;
> > +}
> > +
> >  extern const char *global_cpu_model;
> >  
> >  static int piix4_device_hotplug(DeviceState *qdev, PCIDevice *dev,
> > @@ -621,6 +657,9 @@ static void piix4_acpi_system_hot_add_init(PCIBus *bus, PIIX4PMState *s)
> >      register_ioport_write(PCI_EJ_BASE, 4, 4, pciej_write, bus);
> >      register_ioport_read(PCI_EJ_BASE, 4, 4,  pciej_read, bus);
> >  
> > +    register_ioport_write(PCI_RMV_BASE, 4, 4, pcirmv_write, s);
> > +    register_ioport_read(PCI_RMV_BASE, 4, 4,  pcirmv_read, s);
> > +
> >      pci_bus_hotplug(bus, piix4_device_hotplug, &s->dev.qdev);
> >  }
> >