Re: [PATCH v13 07/10] virtio-iommu-pci: Add virtio iommu pci support

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

On Mon, Feb 03, 2020 at 02:20:55PM +0100, Auger Eric wrote:
> Hi Michael,
> 
> On 2/3/20 2:03 PM, Michael S. Tsirkin wrote:
> > On Sat, Jan 25, 2020 at 06:19:52PM +0100, Eric Auger wrote:
> >> This patch adds virtio-iommu-pci, which is the pci proxy for
> >> the virtio-iommu device.
> >>
> >> Signed-off-by: Eric Auger <eric.auger@redhat.com>
> >> Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
> > 
> > I commented on v11 of this patch:
> >>> Could you send a smaller patchset without pci/acpi bits for now?
> > And you answered:
> >> Yes I am about to send v12.
> > 
> > I guess this patch is here by mistake then?
> > 
> > I think PCI devices should always have config space so guests are
> > not tempted to find work-arounds. Right?
> No it is not here by mistake. I removed everything related non DT
> integration as we discussed.
> 
> DT support is fully upstream even for virtio-iommu-pci.
> https://github.com/torvalds/linux/blob/master/Documentation/devicetree/bindings/virtio/iommu.txt
> 
> So what's wrong implementing that at the moment. As we discussed we
> would use the PCIe config space integration for non DT.
> 
> If I use the MMIO based device, I am forced to lock an MMIO region for
> it in the machvirt memory map:
> https://elixir.bootlin.com/linux/latest/source/Documentation/devicetree/bindings/virtio/mmio.txt
> 
> I guess Peter (Maydell) will not be happy with this situation either.
> 
> Thanks
> 
> Eric

I see. Can't we limit this to DT platforms for now then?



> > 
> >> ---
> >>
> >> v11 -> v12:
> >> - added Jean's R-b
> >> - remove the array of intervals. Will be introduced later?
> >>
> >> v10 -> v11:
> >> - add the reserved_regions array property
> >>
> >> v9 -> v10:
> >> - include "hw/qdev-properties.h" header
> >>
> >> v8 -> v9:
> >> - add the msi-bypass property
> >> - create virtio-iommu-pci.c
> >> ---
> >>  hw/virtio/Makefile.objs          |  1 +
> >>  hw/virtio/virtio-iommu-pci.c     | 88 ++++++++++++++++++++++++++++++++
> >>  include/hw/pci/pci.h             |  1 +
> >>  include/hw/virtio/virtio-iommu.h |  1 +
> >>  qdev-monitor.c                   |  1 +
> >>  5 files changed, 92 insertions(+)
> >>  create mode 100644 hw/virtio/virtio-iommu-pci.c
> >>
> >> diff --git a/hw/virtio/Makefile.objs b/hw/virtio/Makefile.objs
> >> index 2fd9da7410..4e4d39a0a4 100644
> >> --- a/hw/virtio/Makefile.objs
> >> +++ b/hw/virtio/Makefile.objs
> >> @@ -29,6 +29,7 @@ obj-$(CONFIG_VIRTIO_INPUT_HOST) += virtio-input-host-pci.o
> >>  obj-$(CONFIG_VIRTIO_INPUT) += virtio-input-pci.o
> >>  obj-$(CONFIG_VIRTIO_RNG) += virtio-rng-pci.o
> >>  obj-$(CONFIG_VIRTIO_BALLOON) += virtio-balloon-pci.o
> >> +obj-$(CONFIG_VIRTIO_IOMMU) += virtio-iommu-pci.o
> >>  obj-$(CONFIG_VIRTIO_9P) += virtio-9p-pci.o
> >>  obj-$(CONFIG_VIRTIO_SCSI) += virtio-scsi-pci.o
> >>  obj-$(CONFIG_VIRTIO_BLK) += virtio-blk-pci.o
> >> diff --git a/hw/virtio/virtio-iommu-pci.c b/hw/virtio/virtio-iommu-pci.c
> >> new file mode 100644
> >> index 0000000000..4cfae1f9df
> >> --- /dev/null
> >> +++ b/hw/virtio/virtio-iommu-pci.c
> >> @@ -0,0 +1,88 @@
> >> +/*
> >> + * Virtio IOMMU PCI Bindings
> >> + *
> >> + * Copyright (c) 2019 Red Hat, Inc.
> >> + * Written by Eric Auger
> >> + *
> >> + *  This program is free software; you can redistribute it and/or modify
> >> + *  it under the terms of the GNU General Public License version 2 or
> >> + *  (at your option) any later version.
> >> + */
> >> +
> >> +#include "qemu/osdep.h"
> >> +
> >> +#include "virtio-pci.h"
> >> +#include "hw/virtio/virtio-iommu.h"
> >> +#include "hw/qdev-properties.h"
> >> +
> >> +typedef struct VirtIOIOMMUPCI VirtIOIOMMUPCI;
> >> +
> >> +/*
> >> + * virtio-iommu-pci: This extends VirtioPCIProxy.
> >> + *
> >> + */
> >> +#define VIRTIO_IOMMU_PCI(obj) \
> >> +        OBJECT_CHECK(VirtIOIOMMUPCI, (obj), TYPE_VIRTIO_IOMMU_PCI)
> >> +
> >> +struct VirtIOIOMMUPCI {
> >> +    VirtIOPCIProxy parent_obj;
> >> +    VirtIOIOMMU vdev;
> >> +};
> >> +
> >> +static Property virtio_iommu_pci_properties[] = {
> >> +    DEFINE_PROP_UINT32("class", VirtIOPCIProxy, class_code, 0),
> >> +    DEFINE_PROP_END_OF_LIST(),
> >> +};
> >> +
> >> +static void virtio_iommu_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
> >> +{
> >> +    VirtIOIOMMUPCI *dev = VIRTIO_IOMMU_PCI(vpci_dev);
> >> +    DeviceState *vdev = DEVICE(&dev->vdev);
> >> +
> >> +    qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
> >> +    object_property_set_link(OBJECT(dev),
> >> +                             OBJECT(pci_get_bus(&vpci_dev->pci_dev)),
> >> +                             "primary-bus", errp);
> >> +    object_property_set_bool(OBJECT(vdev), true, "realized", errp);
> >> +}
> >> +
> >> +static void virtio_iommu_pci_class_init(ObjectClass *klass, void *data)
> >> +{
> >> +    DeviceClass *dc = DEVICE_CLASS(klass);
> >> +    VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
> >> +    PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
> >> +    k->realize = virtio_iommu_pci_realize;
> >> +    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
> >> +    dc->props = virtio_iommu_pci_properties;
> >> +    pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
> >> +    pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_IOMMU;
> >> +    pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
> >> +    pcidev_k->class_id = PCI_CLASS_OTHERS;
> >> +}
> >> +
> >> +static void virtio_iommu_pci_instance_init(Object *obj)
> >> +{
> >> +    VirtIOIOMMUPCI *dev = VIRTIO_IOMMU_PCI(obj);
> >> +
> >> +    virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
> >> +                                TYPE_VIRTIO_IOMMU);
> >> +}
> >> +
> >> +static const VirtioPCIDeviceTypeInfo virtio_iommu_pci_info = {
> >> +    .base_name             = TYPE_VIRTIO_IOMMU_PCI,
> >> +    .generic_name          = "virtio-iommu-pci",
> >> +    .transitional_name     = "virtio-iommu-pci-transitional",
> >> +    .non_transitional_name = "virtio-iommu-pci-non-transitional",
> >> +    .instance_size = sizeof(VirtIOIOMMUPCI),
> >> +    .instance_init = virtio_iommu_pci_instance_init,
> >> +    .class_init    = virtio_iommu_pci_class_init,
> >> +};
> >> +
> >> +static void virtio_iommu_pci_register(void)
> >> +{
> >> +    virtio_pci_types_register(&virtio_iommu_pci_info);
> >> +}
> >> +
> >> +type_init(virtio_iommu_pci_register)
> >> +
> >> +
> >> diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
> >> index 2acd8321af..cfedf5a995 100644
> >> --- a/include/hw/pci/pci.h
> >> +++ b/include/hw/pci/pci.h
> >> @@ -86,6 +86,7 @@ extern bool pci_available;
> >>  #define PCI_DEVICE_ID_VIRTIO_9P          0x1009
> >>  #define PCI_DEVICE_ID_VIRTIO_VSOCK       0x1012
> >>  #define PCI_DEVICE_ID_VIRTIO_PMEM        0x1013
> >> +#define PCI_DEVICE_ID_VIRTIO_IOMMU       0x1014
> >>  
> >>  #define PCI_VENDOR_ID_REDHAT             0x1b36
> >>  #define PCI_DEVICE_ID_REDHAT_BRIDGE      0x0001
> >> diff --git a/include/hw/virtio/virtio-iommu.h b/include/hw/virtio/virtio-iommu.h
> >> index 2a2c2ecf83..f39aa0fbb4 100644
> >> --- a/include/hw/virtio/virtio-iommu.h
> >> +++ b/include/hw/virtio/virtio-iommu.h
> >> @@ -25,6 +25,7 @@
> >>  #include "hw/pci/pci.h"
> >>  
> >>  #define TYPE_VIRTIO_IOMMU "virtio-iommu-device"
> >> +#define TYPE_VIRTIO_IOMMU_PCI "virtio-iommu-device-base"
> >>  #define VIRTIO_IOMMU(obj) \
> >>          OBJECT_CHECK(VirtIOIOMMU, (obj), TYPE_VIRTIO_IOMMU)
> >>  
> >> diff --git a/qdev-monitor.c b/qdev-monitor.c
> >> index 3465a1e2d0..97f4022b51 100644
> >> --- a/qdev-monitor.c
> >> +++ b/qdev-monitor.c
> >> @@ -66,6 +66,7 @@ static const QDevAlias qdev_alias_table[] = {
> >>      { "virtio-input-host-ccw", "virtio-input-host", QEMU_ARCH_S390X },
> >>      { "virtio-input-host-pci", "virtio-input-host",
> >>              QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
> >> +    { "virtio-iommu-pci", "virtio-iommu", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
> >>      { "virtio-keyboard-ccw", "virtio-keyboard", QEMU_ARCH_S390X },
> >>      { "virtio-keyboard-pci", "virtio-keyboard",
> >>              QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
> >> -- 
> >> 2.20.1
> > 
> >