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intel-iommu: introduce Intel IOMMU (VT-d) emulation

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Add support for emulating Intel IOMMU according to the VT-d specification for
the q35 chipset machine. Implement the logics for DMAR (DMA remapping) without
PASID support. The emulation supports register-based invalidation and primary
fault logging.

Signed-off-by: Le Tan <tamlokveer@gmail.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Le Tan 2014-08-16 13:55:38 +08:00 • committed by Michael S. Tsirkin
parent 8d7b8cb9c2
commit 1da12ec4c8
4 changed files with 1680 additions and 0 deletions
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89
include/hw/i386/intel_iommu.h Normal file
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/*
* QEMU emulation of an Intel IOMMU (VT-d)
* (DMA Remapping device)
*
* Copyright (C) 2013 Knut Omang, Oracle <knut.omang@oracle.com>
* Copyright (C) 2014 Le Tan, <tamlokveer@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef INTEL_IOMMU_H
#define INTEL_IOMMU_H
#include "hw/qdev.h"
#include "sysemu/dma.h"
#define TYPE_INTEL_IOMMU_DEVICE "intel-iommu"
#define INTEL_IOMMU_DEVICE(obj) \
OBJECT_CHECK(IntelIOMMUState, (obj), TYPE_INTEL_IOMMU_DEVICE)
/* DMAR Hardware Unit Definition address (IOMMU unit) */
#define Q35_HOST_BRIDGE_IOMMU_ADDR 0xfed90000ULL
#define VTD_PCI_BUS_MAX 256
#define VTD_PCI_SLOT_MAX 32
#define VTD_PCI_FUNC_MAX 8
#define VTD_PCI_DEVFN_MAX 256
#define VTD_PCI_SLOT(devfn) (((devfn) >> 3) & 0x1f)
#define VTD_PCI_FUNC(devfn) ((devfn) & 0x07)
#define DMAR_REG_SIZE 0x230
#define VTD_HOST_ADDRESS_WIDTH 39
#define VTD_HAW_MASK ((1ULL << VTD_HOST_ADDRESS_WIDTH) - 1)
typedef struct IntelIOMMUState IntelIOMMUState;
typedef struct VTDAddressSpace VTDAddressSpace;
struct VTDAddressSpace {
uint8_t bus_num;
uint8_t devfn;
AddressSpace as;
MemoryRegion iommu;
IntelIOMMUState *iommu_state;
};
/* The iommu (DMAR) device state struct */
struct IntelIOMMUState {
SysBusDevice busdev;
MemoryRegion csrmem;
uint8_t csr[DMAR_REG_SIZE]; /* register values */
uint8_t wmask[DMAR_REG_SIZE]; /* R/W bytes */
uint8_t w1cmask[DMAR_REG_SIZE]; /* RW1C(Write 1 to Clear) bytes */
uint8_t womask[DMAR_REG_SIZE]; /* WO (write only - read returns 0) */
uint32_t version;
dma_addr_t root; /* Current root table pointer */
bool root_extended; /* Type of root table (extended or not) */
bool dmar_enabled; /* Set if DMA remapping is enabled */
uint16_t iq_head; /* Current invalidation queue head */
uint16_t iq_tail; /* Current invalidation queue tail */
dma_addr_t iq; /* Current invalidation queue pointer */
uint16_t iq_size; /* IQ Size in number of entries */
bool qi_enabled; /* Set if the QI is enabled */
uint8_t iq_last_desc_type; /* The type of last completed descriptor */
/* The index of the Fault Recording Register to be used next.
* Wraps around from N-1 to 0, where N is the number of FRCD_REG.
*/
uint16_t next_frcd_reg;
uint64_t cap; /* The value of capability reg */
uint64_t ecap; /* The value of extended capability reg */
MemoryRegionIOMMUOps iommu_ops;
VTDAddressSpace **address_spaces[VTD_PCI_BUS_MAX];
};
#endif