On Mon, Apr 02, 2012 at 09:46:07AM +0300, Michael S. Tsirkin wrote:
> This conflicts with deduplication of properties work.
> I'll apply on top of that, so don't worry.
Alrighty. Any ETA?
>
> On Mon, Apr 02, 2012 at 12:43:06PM +1000, David Gibson wrote:
> > Anthony..
> >
> > please apply?
> >
> > On Mon, Mar 26, 2012 at 12:19:40PM +1100, David Gibson wrote:
> > > Currently the virtio balloon device, when using the virtio-pci interface
> > > advertises itself with PCI class code MEMORY_RAM. This is wrong; the
> > > balloon is vaguely related to memory, but is nothing like a PCI memory
> > > device in the meaning of the class code, and this code is not required or
> > > suggested by the virtio PCI specification.
> > >
> > > Worse, this patch causes problems on the pseries machine, because the
> > > firmware, seeing this class code, advertises the device as memory in the
> > > device tree, and then a guest kernel bug causes it to see this "memory"
> > > before the real system memory, leading to a crash in early boot.
> > >
> > > This patch fixes the problem by removing the bogus PCI class code on the
> > > balloon device. The backwards compatibility PC machines get new compat
> > > properties so that they don't change.
> > >
> > > Cc: Michael S. Tsirkin <m...@redhat.com>
> > > Cc: Rusty Russell <ru...@rustcorp.com.au>
> > >
> > > Signed-off-by: David Gibson <da...@gibson.dropbear.id.au>
> > > ---
> > > hw/pc_piix.c | 28 ++++++++++++++++++++++++++++
> > > hw/virtio-pci.c | 8 +++++++-
> > > 2 files changed, 35 insertions(+), 1 deletions(-)
> > >
> > > diff --git a/hw/pc_piix.c b/hw/pc_piix.c
> > > index 3f99f9a..55dcd2e 100644
> > > --- a/hw/pc_piix.c
> > > +++ b/hw/pc_piix.c
> > > @@ -386,6 +386,10 @@ static QEMUMachine pc_machine_v1_0 = {
> > > .driver = "isa-fdc",
> > > .property = "check_media_rate",
> > > .value = "off",
> > > + }, {
> > > + .driver = "virtio-balloon-pci",
> > > + .property = "class",
> > > + .value = stringify(PCI_CLASS_MEMORY_RAM),
> > > },
> > > { /* end of list */ }
> > > },
> > > @@ -405,6 +409,10 @@ static QEMUMachine pc_machine_v0_15 = {
> > > .driver = "isa-fdc",
> > > .property = "check_media_rate",
> > > .value = "off",
> > > + }, {
> > > + .driver = "virtio-balloon-pci",
> > > + .property = "class",
> > > + .value = stringify(PCI_CLASS_MEMORY_RAM),
> > > },
> > > { /* end of list */ }
> > > },
> > > @@ -449,6 +457,10 @@ static QEMUMachine pc_machine_v0_14 = {
> > > .driver = "pc-sysfw",
> > > .property = "rom_only",
> > > .value = stringify(1),
> > > + }, {
> > > + .driver = "virtio-balloon-pci",
> > > + .property = "class",
> > > + .value = stringify(PCI_CLASS_MEMORY_RAM),
> > > },
> > > { /* end of list */ }
> > > },
> > > @@ -505,6 +517,10 @@ static QEMUMachine pc_machine_v0_13 = {
> > > .driver = "pc-sysfw",
> > > .property = "rom_only",
> > > .value = stringify(1),
> > > + }, {
> > > + .driver = "virtio-balloon-pci",
> > > + .property = "class",
> > > + .value = stringify(PCI_CLASS_MEMORY_RAM),
> > > },
> > > { /* end of list */ }
> > > },
> > > @@ -565,6 +581,10 @@ static QEMUMachine pc_machine_v0_12 = {
> > > .driver = "pc-sysfw",
> > > .property = "rom_only",
> > > .value = stringify(1),
> > > + }, {
> > > + .driver = "virtio-balloon-pci",
> > > + .property = "class",
> > > + .value = stringify(PCI_CLASS_MEMORY_RAM),
> > > },
> > > { /* end of list */ }
> > > }
> > > @@ -633,6 +653,10 @@ static QEMUMachine pc_machine_v0_11 = {
> > > .driver = "pc-sysfw",
> > > .property = "rom_only",
> > > .value = stringify(1),
> > > + }, {
> > > + .driver = "virtio-balloon-pci",
> > > + .property = "class",
> > > + .value = stringify(PCI_CLASS_MEMORY_RAM),
> > > },
> > > { /* end of list */ }
> > > }
> > > @@ -713,6 +737,10 @@ static QEMUMachine pc_machine_v0_10 = {
> > > .driver = "pc-sysfw",
> > > .property = "rom_only",
> > > .value = stringify(1),
> > > + }, {
> > > + .driver = "virtio-balloon-pci",
> > > + .property = "class",
> > > + .value = stringify(PCI_CLASS_MEMORY_RAM),
> > > },
> > > { /* end of list */ }
> > > },
> > > diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
> > > index a0fb7c1..a1fa656 100644
> > > --- a/hw/virtio-pci.c
> > > +++ b/hw/virtio-pci.c
> > > @@ -790,6 +790,11 @@ static int virtio_balloon_init_pci(PCIDevice
> > > *pci_dev)
> > > VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
> > > VirtIODevice *vdev;
> > >
> > > + if (proxy->class_code != PCI_CLASS_OTHERS &&
> > > + proxy->class_code != PCI_CLASS_MEMORY_RAM) { /* qemu < 1.1 */
> > > + proxy->class_code = PCI_CLASS_OTHERS;
> > > + }
> > > +
> > > vdev = virtio_balloon_init(&pci_dev->qdev);
> > > if (!vdev) {
> > > return -1;
> > > @@ -905,6 +910,7 @@ static TypeInfo virtio_serial_info = {
> > > };
> > >
> > > static Property virtio_balloon_properties[] = {
> > > + DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code,
> > > PCI_CLASS_OTHERS),
> > > DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
> > > DEFINE_PROP_END_OF_LIST(),
> > > };
> > > @@ -919,7 +925,7 @@ static void virtio_balloon_class_init(ObjectClass
> > > *klass, void *data)
> > > k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
> > > k->device_id = PCI_DEVICE_ID_VIRTIO_BALLOON;
> > > k->revision = VIRTIO_PCI_ABI_VERSION;
> > > - k->class_id = PCI_CLASS_MEMORY_RAM;
> > > + k->class_id = PCI_CLASS_OTHERS;
> > > dc->reset = virtio_pci_reset;
> > > dc->props = virtio_balloon_properties;
> > > }
> >
>
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
