diff options
Diffstat (limited to 'hw/i386/intel_iommu.c')
| -rw-r--r-- | hw/i386/intel_iommu.c | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c index 6a6cb3be8d..2e57396e6d 100644 --- a/hw/i386/intel_iommu.c +++ b/hw/i386/intel_iommu.c @@ -1982,6 +1982,240 @@ static Property vtd_properties[] = { DEFINE_PROP_END_OF_LIST(), }; +/* Read IRTE entry with specific index */ +static int vtd_irte_get(IntelIOMMUState *iommu, uint16_t index, + VTD_IRTE *entry) +{ + dma_addr_t addr = 0x00; + + addr = iommu->intr_root + index * sizeof(*entry); + if (dma_memory_read(&address_space_memory, addr, entry, + sizeof(*entry))) { + VTD_DPRINTF(GENERAL, "error: fail to access IR root at 0x%"PRIx64 + " + %"PRIu16, iommu->intr_root, index); + return -VTD_FR_IR_ROOT_INVAL; + } + + if (!entry->present) { + VTD_DPRINTF(GENERAL, "error: present flag not set in IRTE" + " entry index %u value 0x%"PRIx64 " 0x%"PRIx64, + index, le64_to_cpu(entry->data[1]), + le64_to_cpu(entry->data[0])); + return -VTD_FR_IR_ENTRY_P; + } + + if (entry->__reserved_0 || entry->__reserved_1 || \ + entry->__reserved_2) { + VTD_DPRINTF(GENERAL, "error: IRTE entry index %"PRIu16 + " reserved fields non-zero: 0x%"PRIx64 " 0x%"PRIx64, + index, le64_to_cpu(entry->data[1]), + le64_to_cpu(entry->data[0])); + return -VTD_FR_IR_IRTE_RSVD; + } + + /* + * TODO: Check Source-ID corresponds to SVT (Source Validation + * Type) bits + */ + + return 0; +} + +/* Fetch IRQ information of specific IR index */ +static int vtd_remap_irq_get(IntelIOMMUState *iommu, uint16_t index, VTDIrq *irq) +{ + VTD_IRTE irte = { 0 }; + int ret = 0; + + ret = vtd_irte_get(iommu, index, &irte); + if (ret) { + return ret; + } + + irq->trigger_mode = irte.trigger_mode; + irq->vector = irte.vector; + irq->delivery_mode = irte.delivery_mode; + /* Not support EIM yet: please refer to vt-d 9.10 DST bits */ +#define VTD_IR_APIC_DEST_MASK (0xff00ULL) +#define VTD_IR_APIC_DEST_SHIFT (8) + irq->dest = (le32_to_cpu(irte.dest_id) & VTD_IR_APIC_DEST_MASK) >> \ + VTD_IR_APIC_DEST_SHIFT; + irq->dest_mode = irte.dest_mode; + irq->redir_hint = irte.redir_hint; + + VTD_DPRINTF(IR, "remapping interrupt index %d: trig:%u,vec:%u," + "deliver:%u,dest:%u,dest_mode:%u", index, + irq->trigger_mode, irq->vector, irq->delivery_mode, + irq->dest, irq->dest_mode); + + return 0; +} + +/* Generate one MSI message from VTDIrq info */ +static void vtd_generate_msi_message(VTDIrq *irq, MSIMessage *msg_out) +{ + VTD_MSIMessage msg = {}; + + /* Generate address bits */ + msg.dest_mode = irq->dest_mode; + msg.redir_hint = irq->redir_hint; + msg.dest = irq->dest; + msg.__addr_head = cpu_to_le32(0xfee); + /* Keep this from original MSI address bits */ + msg.__not_used = irq->msi_addr_last_bits; + + /* Generate data bits */ + msg.vector = irq->vector; + msg.delivery_mode = irq->delivery_mode; + msg.level = 1; + msg.trigger_mode = irq->trigger_mode; + + msg_out->address = msg.msi_addr; + msg_out->data = msg.msi_data; +} + +/* Interrupt remapping for MSI/MSI-X entry */ +static int vtd_interrupt_remap_msi(IntelIOMMUState *iommu, + MSIMessage *origin, + MSIMessage *translated) +{ + int ret = 0; + VTD_IR_MSIAddress addr; + uint16_t index; + VTDIrq irq = {0}; + + assert(origin && translated); + + if (!iommu || !iommu->intr_enabled) { + goto do_not_translate; + } + + if (origin->address & VTD_MSI_ADDR_HI_MASK) { + VTD_DPRINTF(GENERAL, "error: MSI addr high 32 bits nonzero" + " during interrupt remapping: 0x%"PRIx32, + (uint32_t)((origin->address & VTD_MSI_ADDR_HI_MASK) >> \ + VTD_MSI_ADDR_HI_SHIFT)); + return -VTD_FR_IR_REQ_RSVD; + } + + addr.data = origin->address & VTD_MSI_ADDR_LO_MASK; + if (le16_to_cpu(addr.__head) != 0xfee) { + VTD_DPRINTF(GENERAL, "error: MSI addr low 32 bits invalid: " + "0x%"PRIx32, addr.data); + return -VTD_FR_IR_REQ_RSVD; + } + + /* This is compatible mode. */ + if (addr.int_mode != VTD_IR_INT_FORMAT_REMAP) { + goto do_not_translate; + } + + index = addr.index_h << 15 | le16_to_cpu(addr.index_l); + +#define VTD_IR_MSI_DATA_SUBHANDLE (0x0000ffff) +#define VTD_IR_MSI_DATA_RESERVED (0xffff0000) + + if (addr.sub_valid) { + /* See VT-d spec 5.1.2.2 and 5.1.3 on subhandle */ + index += origin->data & VTD_IR_MSI_DATA_SUBHANDLE; + } + + ret = vtd_remap_irq_get(iommu, index, &irq); + if (ret) { + return ret; + } + + if (addr.sub_valid) { + VTD_DPRINTF(IR, "received MSI interrupt"); + if (origin->data & VTD_IR_MSI_DATA_RESERVED) { + VTD_DPRINTF(GENERAL, "error: MSI data bits non-zero for " + "interrupt remappable entry: 0x%"PRIx32, + origin->data); + return -VTD_FR_IR_REQ_RSVD; + } + } else { + uint8_t vector = origin->data & 0xff; + VTD_DPRINTF(IR, "received IOAPIC interrupt"); + /* IOAPIC entry vector should be aligned with IRTE vector + * (see vt-d spec 5.1.5.1). */ + if (vector != irq.vector) { + VTD_DPRINTF(GENERAL, "IOAPIC vector inconsistent: " + "entry: %d, IRTE: %d, index: %d", + vector, irq.vector, index); + } + } + + /* + * We'd better keep the last two bits, assuming that guest OS + * might modify it. Keep it does not hurt after all. + */ + irq.msi_addr_last_bits = addr.__not_care; + + /* Translate VTDIrq to MSI message */ + vtd_generate_msi_message(&irq, translated); + + VTD_DPRINTF(IR, "mapping MSI 0x%"PRIx64":0x%"PRIx32 " -> " + "0x%"PRIx64":0x%"PRIx32, origin->address, origin->data, + translated->address, translated->data); + return 0; + +do_not_translate: + memcpy(translated, origin, sizeof(*origin)); + return 0; +} + +static MemTxResult vtd_mem_ir_read(void *opaque, hwaddr addr, + uint64_t *data, unsigned size, + MemTxAttrs attrs) +{ + return MEMTX_OK; +} + +static MemTxResult vtd_mem_ir_write(void *opaque, hwaddr addr, + uint64_t value, unsigned size, + MemTxAttrs attrs) +{ + int ret = 0; + MSIMessage from = {0}, to = {0}; + + from.address = (uint64_t) addr + VTD_INTERRUPT_ADDR_FIRST; + from.data = (uint32_t) value; + + ret = vtd_interrupt_remap_msi(opaque, &from, &to); + if (ret) { + /* TODO: report error */ + VTD_DPRINTF(GENERAL, "int remap fail for addr 0x%"PRIx64 + " data 0x%"PRIx32, from.address, from.data); + /* Drop this interrupt */ + return MEMTX_ERROR; + } + + VTD_DPRINTF(IR, "delivering MSI 0x%"PRIx64":0x%"PRIx32 + " for device sid 0x%04x", + to.address, to.data, sid); + + if (dma_memory_write(&address_space_memory, to.address, + &to.data, size)) { + VTD_DPRINTF(GENERAL, "error: fail to write 0x%"PRIx64 + " value 0x%"PRIx32, to.address, to.data); + } + + return MEMTX_OK; +} + +static const MemoryRegionOps vtd_mem_ir_ops = { + .read_with_attrs = vtd_mem_ir_read, + .write_with_attrs = vtd_mem_ir_write, + .endianness = DEVICE_LITTLE_ENDIAN, + .impl = { + .min_access_size = 4, + .max_access_size = 4, + }, + .valid = { + .min_access_size = 4, + .max_access_size = 4, + }, +}; VTDAddressSpace *vtd_find_add_as(IntelIOMMUState *s, PCIBus *bus, int devfn) { @@ -2009,6 +2243,11 @@ VTDAddressSpace *vtd_find_add_as(IntelIOMMUState *s, PCIBus *bus, int devfn) vtd_dev_as->context_cache_entry.context_cache_gen = 0; memory_region_init_iommu(&vtd_dev_as->iommu, OBJECT(s), &s->iommu_ops, "intel_iommu", UINT64_MAX); + memory_region_init_io(&vtd_dev_as->iommu_ir, OBJECT(s), + &vtd_mem_ir_ops, s, "intel_iommu_ir", + VTD_INTERRUPT_ADDR_SIZE); + memory_region_add_subregion(&vtd_dev_as->iommu, VTD_INTERRUPT_ADDR_FIRST, + &vtd_dev_as->iommu_ir); address_space_init(&vtd_dev_as->as, &vtd_dev_as->iommu, "intel_iommu"); } |