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.
Signed-off-by: Jean-Philippe Brucker <jean-phili...@linaro.org> --- hw/acpi/viot.h | 13 +++++++ hw/acpi/viot.c | 82 +++++++++++++++++++++++++++++++++++++++++++++ hw/acpi/Kconfig | 4 +++ hw/acpi/meson.build | 1 + 4 files changed, 100 insertions(+) create mode 100644 hw/acpi/viot.h create mode 100644 hw/acpi/viot.c diff --git a/hw/acpi/viot.h b/hw/acpi/viot.h new file mode 100644 index 0000000000..4cef29a640 --- /dev/null +++ b/hw/acpi/viot.h @@ -0,0 +1,13 @@ +/* + * ACPI Virtual I/O Translation Table implementation + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ +#ifndef VIOT_H +#define VIOT_H + +void build_viot(GArray *table_data, BIOSLinker *linker, + uint16_t virtio_iommu_bdf, const char *oem_id, + const char *oem_table_id); + +#endif /* VIOT_H */ diff --git a/hw/acpi/viot.c b/hw/acpi/viot.c new file mode 100644 index 0000000000..5cd10e9553 --- /dev/null +++ b/hw/acpi/viot.c @@ -0,0 +1,82 @@ +/* + * ACPI Virtual I/O Translation table implementation + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ +#include "qemu/osdep.h" +#include "hw/acpi/acpi.h" +#include "hw/acpi/aml-build.h" +#include "hw/acpi/viot.h" +#include "hw/pci/pci.h" +#include "hw/pci/pci_host.h" + +/* Build PCI range for a given PCI host bridge */ +static int viot_host_bridges(Object *obj, void *opaque) +{ + GArray *pci_range_blob = opaque; + + if (object_dynamic_cast(obj, TYPE_PCI_HOST_BRIDGE)) { + PCIBus *bus = PCI_HOST_BRIDGE(obj)->bus; + + if (bus && !pci_bus_bypass_iommu(bus)) { + int min_bus, max_bus; + + pci_bus_range(bus, &min_bus, &max_bus); + + AcpiViotPciRange pci_range = { + .type = ACPI_VIOT_NODE_PCI_RANGE, + .length = cpu_to_le16(sizeof(pci_range)), + .bdf_start = cpu_to_le16(PCI_BUILD_BDF(min_bus, 0)), + .bdf_end = cpu_to_le16(PCI_BUILD_BDF(max_bus, 0xff)), + .endpoint_start = cpu_to_le32(PCI_BUILD_BDF(min_bus, 0)), + }; + + g_array_append_val(pci_range_blob, pci_range); + } + } + + return 0; +} + +/* + * Generate a VIOT table with one PCI-based virtio-iommu that manages PCI + * endpoints. + */ +void build_viot(GArray *table_data, BIOSLinker *linker, + uint16_t virtio_iommu_bdf, const char *oem_id, + const char *oem_table_id) +{ + int i; + AcpiViot *viot; + AcpiViotPciRange *pci_range; + AcpiViotVirtioIommuPci *viommu; + int viommu_off = sizeof(*viot); + int viot_start = table_data->len; + GArray *pci_ranges = g_array_new(false, true, sizeof(*pci_range)); + + viot = acpi_data_push(table_data, sizeof(*viot)); + viot->node_offset = cpu_to_le16(viommu_off); + + viommu = acpi_data_push(table_data, sizeof(*viommu)); + viommu->type = ACPI_VIOT_NODE_VIRTIO_IOMMU_PCI; + viommu->length = cpu_to_le16(sizeof(*viommu)); + viommu->bdf = cpu_to_le16(virtio_iommu_bdf); + + /* Build the list of PCI ranges that this viommu manages */ + object_child_foreach_recursive(object_get_root(), viot_host_bridges, + pci_ranges); + + for (i = 0; i < pci_ranges->len; i++) { + pci_range = &g_array_index(pci_ranges, AcpiViotPciRange, i); + pci_range->output_node = cpu_to_le16(viommu_off); + } + viot->node_count = cpu_to_le16(pci_ranges->len + 1); + + g_array_append_vals(table_data, pci_ranges->data, + pci_ranges->len * sizeof(*pci_range)); + g_array_free(pci_ranges, true); + + build_header(linker, table_data, (void *)(table_data->data + viot_start), + "VIOT", table_data->len - viot_start, 0, oem_id, oem_table_id); +} + diff --git a/hw/acpi/Kconfig b/hw/acpi/Kconfig index cfc4ede8d9..abad79c103 100644 --- a/hw/acpi/Kconfig +++ b/hw/acpi/Kconfig @@ -41,6 +41,10 @@ config ACPI_VMGENID default y depends on PC +config ACPI_VIOT + bool + depends on ACPI + config ACPI_HW_REDUCED bool select ACPI diff --git a/hw/acpi/meson.build b/hw/acpi/meson.build index 29f804d13e..a510988b27 100644 --- a/hw/acpi/meson.build +++ b/hw/acpi/meson.build @@ -16,6 +16,7 @@ acpi_ss.add(when: 'CONFIG_ACPI_HW_REDUCED', if_true: files('generic_event_device acpi_ss.add(when: 'CONFIG_ACPI_HMAT', if_true: files('hmat.c')) acpi_ss.add(when: 'CONFIG_ACPI_APEI', if_true: files('ghes.c'), if_false: files('ghes-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')) acpi_ss.add(when: 'CONFIG_ACPI_X86_ICH', if_true: files('ich9.c', 'tco.c')) acpi_ss.add(when: 'CONFIG_IPMI', if_true: files('ipmi.c'), if_false: files('ipmi-stub.c')) acpi_ss.add(when: 'CONFIG_PC', if_false: files('acpi-x86-stub.c')) -- 2.32.0