Re: [PATCH v2 2/8] hw/acpi: Add VIOT table

[Jean-Philippe Brucker <jean-philippe@linaro.org>]

On Mon, Sep 06, 2021 at 02:58:55PM +0200, Eric Auger wrote:
> Hi Jean,
> 
> On 9/3/21 4:32 PM, Jean-Philippe Brucker wrote:
> > Add a function that generates a Virtual I/O Translation table (VIOT),
> > describing the topology of paravirtual IOMMUs. The table is created when
> > instantiating a virtio-iommu device. It contains a virtio-iommu node and
> > PCI Range nodes for endpoints managed by the IOMMU. By default, a single
> > node describes all PCI devices. When passing the "default_bus_bypass_iommu"
> > machine option and "bypass_iommu" PXB option, only buses that do not
> > bypass the IOMMU are described by PCI Range nodes.
> 
> You may consider to add a test for the new VIOT table (However this may
> be added afterwards). See tests/qtest/bios-tables-test.c for the process
> and examples.

Sure, it adds 5 patches to the series

> > +/*
> > + * Generate a VIOT table with one PCI-based virtio-iommu that manages PCI
> > + * endpoints.
> Add a link to the doc + Table refs?
> 
> https://jpbrucker.net/virtio-iommu/viot/viot-v9.pdf

No, this document is only temporary until the next ACPI release. Although
the titles and text should be the same, I don't know the refs in the final
document but they will be different

> 
> > + */
> > +void build_viot(GArray *table_data, BIOSLinker *linker,
> > +                uint16_t virtio_iommu_bdf, const char *oem_id,
> > +                const char *oem_table_id)
> > +{
> > +    /* virtio-iommu node follows the header */
> > +    int viommu_off = sizeof(AcpiViot);
> > +    int viot_start = table_data->len;
> > +    struct viot_pci_ranges pci_ranges = {
> > +        .output_node = viommu_off,
> > +        .blob = g_array_new(false, true, 1),
> > +    };
> > +
> > +    /* Build the list of PCI ranges that this viommu manages */
> > +    object_child_foreach_recursive(object_get_root(), viot_host_bridges,
> > +                                   &pci_ranges);
> > +
> > +    /* VIOT header */
> > +    acpi_data_push(table_data, sizeof(AcpiTableHeader));
> Depending on the order of landing, this may be replaced by Igor's
> 
> acpi_init_table() and associated with acpi_table_composed().

Ok I'll prepare that as a fixup, and send it or squash it after the ACPI
series lands

> <<<<<<< HEAD
> acpi_ss.add(when: 'CONFIG_ACPI_PIIX4', if_true: files('piix4.c'))
> acpi_ss.add(when: 'CONFIG_ACPI_PCIHP', if_true: files('pcihp.c'))
> acpi_ss.add(when: 'CONFIG_ACPI_PCIHP', if_false:
> files('acpi-pci-hotplug-stub.c'))
> =======
> acpi_ss.add(when: 'CONFIG_ACPI_X86', if_true: files('piix4.c', 'pcihp.c'))
> acpi_ss.add(when: 'CONFIG_ACPI_VIOT', if_true: files('viot.c'))
> >>>>>>> hw/acpi: Add VIOT table

Indeed, fixed

Thanks,
Jean