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

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>

1 files changed, 89 insertions, 0 deletions

diff --git a/include/hw/i386/intel_iommu.h b/include/hw/i386/intel_iommu.h
new file mode 100644
index 0000000000..fe1f1e987c
--- /dev/null
+++ b/include/hw/i386/intel_iommu.h
@@ -0,0 +1,89 @@
+/*
+ * 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