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acpi: add DMAR scope definition for root IOAPIC

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To enable interrupt remapping for intel IOMMU device, each IOAPIC device
in the system reported via ACPI MADT must be explicitly enumerated under
one specific remapping hardware unit. This patch adds the root-complex
IOAPIC into the default DMAR device.

Please refer to VT-d spec 8.3.1.1 for more information.

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Peter Xu 2016-07-14 13:56:17 +08:00 committed by Michael S. Tsirkin
parent d54bd7f80a
commit cfc13df462
3 changed files with 38 additions and 3 deletions
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20
hw/i386/acpi-build.c
View File

@ -81,6 +81,9 @@
#define ACPI_BUILD_DPRINTF(fmt, ...)
#endif
/* Default IOAPIC ID */
#define ACPI_BUILD_IOAPIC_ID 0x0
typedef struct AcpiMcfgInfo {
uint64_t mcfg_base;
uint32_t mcfg_size;
@ -384,7 +387,6 @@ build_madt(GArray *table_data, BIOSLinker *linker, PCMachineState *pcms)
io_apic = acpi_data_push(table_data, sizeof *io_apic);
io_apic->type = ACPI_APIC_IO;
io_apic->length = sizeof(*io_apic);
#define ACPI_BUILD_IOAPIC_ID 0x0
io_apic->io_apic_id = ACPI_BUILD_IOAPIC_ID;
io_apic->address = cpu_to_le32(IO_APIC_DEFAULT_ADDRESS);
io_apic->interrupt = cpu_to_le32(0);
@ -2468,6 +2470,9 @@ build_dmar_q35(GArray *table_data, BIOSLinker *linker)
AcpiDmarHardwareUnit *drhd;
uint8_t dmar_flags = 0;
X86IOMMUState *iommu = x86_iommu_get_default();
AcpiDmarDeviceScope *scope = NULL;
/* Root complex IOAPIC use one path[0] only */
size_t ioapic_scope_size = sizeof(*scope) + sizeof(scope->path[0]);
assert(iommu);
if (iommu->intr_supported) {
@ -2479,13 +2484,22 @@ build_dmar_q35(GArray *table_data, BIOSLinker *linker)
dmar->flags = dmar_flags;
/* DMAR Remapping Hardware Unit Definition structure */
drhd = acpi_data_push(table_data, sizeof(*drhd));
drhd = acpi_data_push(table_data, sizeof(*drhd) + ioapic_scope_size);
drhd->type = cpu_to_le16(ACPI_DMAR_TYPE_HARDWARE_UNIT);
drhd->length = cpu_to_le16(sizeof(*drhd)); /* No device scope now */
drhd->length = cpu_to_le16(sizeof(*drhd) + ioapic_scope_size);
drhd->flags = ACPI_DMAR_INCLUDE_PCI_ALL;
drhd->pci_segment = cpu_to_le16(0);
drhd->address = cpu_to_le64(Q35_HOST_BRIDGE_IOMMU_ADDR);
/* Scope definition for the root-complex IOAPIC. See VT-d spec
* 8.3.1 (version Oct. 2014 or later). */
scope = &drhd->scope[0];
scope->entry_type = 0x03; /* Type: 0x03 for IOAPIC */
scope->length = ioapic_scope_size;
scope->enumeration_id = ACPI_BUILD_IOAPIC_ID;
scope->bus = Q35_PSEUDO_BUS_PLATFORM;
scope->path[0] = cpu_to_le16(Q35_PSEUDO_DEVFN_IOAPIC);
build_header(linker, table_data, (void *)(table_data->data + dmar_start),
"DMAR", table_data->len - dmar_start, 1, NULL, NULL);
}

13
include/hw/acpi/acpi-defs.h
View File

@ -571,6 +571,18 @@ enum {
/*
* Sub-structures for DMAR
*/
/* Device scope structure for DRHD. */
struct AcpiDmarDeviceScope {
uint8_t entry_type;
uint8_t length;
uint16_t reserved;
uint8_t enumeration_id;
uint8_t bus;
uint16_t path[0]; /* list of dev:func pairs */
} QEMU_PACKED;
typedef struct AcpiDmarDeviceScope AcpiDmarDeviceScope;
/* Type 0: Hardware Unit Definition */
struct AcpiDmarHardwareUnit {
uint16_t type;
@ -579,6 +591,7 @@ struct AcpiDmarHardwareUnit {
uint8_t reserved;
uint16_t pci_segment; /* The PCI Segment associated with this unit */
uint64_t address; /* Base address of remapping hardware register-set */
AcpiDmarDeviceScope scope[0];
} QEMU_PACKED;
typedef struct AcpiDmarHardwareUnit AcpiDmarHardwareUnit;

8
include/hw/pci-host/q35.h
View File

@ -179,4 +179,12 @@ typedef struct Q35PCIHost {
uint64_t mch_mcfg_base(void);
/*
* Arbitary but unique BNF number for IOAPIC device.
*
* TODO: make sure there would have no conflict with real PCI bus
*/
#define Q35_PSEUDO_BUS_PLATFORM (0xff)
#define Q35_PSEUDO_DEVFN_IOAPIC (0x00)
#endif /* HW_Q35_H */