[Qemu-devel] Re: [PATCH V6 24/32] pci: pcie host and mmcfg support.

[Michael S. Tsirkin]

On Fri, Oct 30, 2009 at 09:21:18PM +0900, Isaku Yamahata wrote:
> This patch adds common routines for pcie host bridge and pcie mmcfg.
> This will be used by q35 based chipset emulation.
> 
> Signed-off-by: Isaku Yamahata <address@hidden>
> ---
>  Makefile.target |    2 +-
>  hw/hw.h         |   11 +++
>  hw/pci.c        |   86 +++++++++++++++++++++----
>  hw/pci.h        |   27 +++++++-
>  hw/pcie_host.c  |  192 
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  hw/pcie_host.h  |   50 ++++++++++++++
>  6 files changed, 349 insertions(+), 19 deletions(-)
>  create mode 100644 hw/pcie_host.c
>  create mode 100644 hw/pcie_host.h
> 
> diff --git a/Makefile.target b/Makefile.target
> index db0d0ab..bc3c375 100644
> --- a/Makefile.target
> +++ b/Makefile.target
> @@ -154,7 +154,7 @@ endif #CONFIG_BSD_USER
>  # System emulator target
>  ifdef CONFIG_SOFTMMU
>  
> -obj-y = vl.o async.o monitor.o pci.o pci_host.o machine.o gdbstub.o
> +obj-y = vl.o async.o monitor.o pci.o pci_host.o pcie_host.o machine.o 
> gdbstub.o
>  # virtio has to be here due to weird dependency between PCI and virtio-net.
>  # need to fix this properly
>  obj-y += virtio-blk.o virtio-balloon.o virtio-net.o virtio-console.o 
> virtio-pci.o
> diff --git a/hw/hw.h b/hw/hw.h
> index cf8c304..1d4af2a 100644
> --- a/hw/hw.h
> +++ b/hw/hw.h
> @@ -512,6 +512,17 @@ extern const VMStateDescription vmstate_pci_device;
>      .offset     = vmstate_offset_value(_state, _field, PCIDevice),   \
>  }
>  
> +extern const VMStateDescription vmstate_pcie_device;
> +
> +#define VMSTATE_PCIE_DEVICE(_field, _state) {                        \
> +    .name       = (stringify(_field)),                               \
> +    .version_id = 2,                                                 \
> +    .size       = sizeof(PCIDevice),                                 \
> +    .vmsd       = &vmstate_pcie_device,                              \
> +    .flags      = VMS_STRUCT,                                        \
> +    .offset     = vmstate_offset_value(_state, _field, PCIDevice),   \
> +}
> +
>  extern const VMStateDescription vmstate_i2c_slave;
>  
>  #define VMSTATE_I2C_SLAVE(_field, _state) {                          \
> diff --git a/hw/pci.c b/hw/pci.c
> index a599996..67133b6 100644
> --- a/hw/pci.c
> +++ b/hw/pci.c
> @@ -23,6 +23,7 @@
>   */
>  #include "hw.h"
>  #include "pci.h"
> +#include "pci_host.h"
>  #include "monitor.h"
>  #include "net.h"
>  #include "sysemu.h"

Why do we need this include?
Would be nicer not to have the dependency.

> @@ -248,18 +249,24 @@ static uint8_t pci_sub_bus(PCIBus *s)
>  static int get_pci_config_device(QEMUFile *f, void *pv, size_t size)
>  {
>      PCIDevice *s = container_of(pv, PCIDevice, config);
> -    uint8_t config[PCI_CONFIG_SPACE_SIZE];
> +    uint8_t *config;
>      int i;
>  
> -    assert(size == sizeof config);
> -    qemu_get_buffer(f, config, sizeof config);
> -    for (i = 0; i < sizeof config; ++i)
> -        if ((config[i] ^ s->config[i]) & s->cmask[i] & ~s->wmask[i])
> +    assert(size == pci_config_size(s));
> +    config = qemu_malloc(size);
> +
> +    qemu_get_buffer(f, config, size);
> +    for (i = 0; i < size; ++i) {
> +        if ((config[i] ^ s->config[i]) & s->cmask[i] & ~s->wmask[i]) {
> +            qemu_free(config);
>              return -EINVAL;
> -    memcpy(s->config, config, sizeof config);
> +        }
> +    }
> +    memcpy(s->config, config, size);
>  
>      pci_update_mappings(s);
>  
> +    qemu_free(config);
>      return 0;
>  }
>  
> @@ -267,6 +274,7 @@ static int get_pci_config_device(QEMUFile *f, void *pv, 
> size_t size)
>  static void put_pci_config_device(QEMUFile *f, void *pv, size_t size)
>  {
>      const uint8_t *v = pv;
> +    assert(size == pci_config_size(container_of(pv, PCIDevice, config)));
>      qemu_put_buffer(f, v, size);
>  }
>  
> @@ -283,21 +291,42 @@ const VMStateDescription vmstate_pci_device = {
>      .minimum_version_id_old = 1,
>      .fields      = (VMStateField []) {
>          VMSTATE_INT32_LE(version_id, PCIDevice),
> -        VMSTATE_SINGLE(config, PCIDevice, 0, vmstate_info_pci_config,
> -                       typeof_field(PCIDevice,config)),
> +        VMSTATE_BUFFER_UNSAFE_INFO(config, PCIDevice, 0,
> +                                   vmstate_info_pci_config,
> +                                   PCI_CONFIG_SPACE_SIZE),
> +        VMSTATE_INT32_ARRAY_V(irq_state, PCIDevice, PCI_NUM_PINS, 2),
> +        VMSTATE_END_OF_LIST()
> +    }
> +};
> +
> +const VMStateDescription vmstate_pcie_device = {
> +    .name = "PCIDevice",
> +    .version_id = 2,
> +    .minimum_version_id = 1,
> +    .minimum_version_id_old = 1,
> +    .fields      = (VMStateField []) {
> +        VMSTATE_INT32_LE(version_id, PCIDevice),
> +        VMSTATE_BUFFER_UNSAFE_INFO(config, PCIDevice, 0,
> +                                   vmstate_info_pci_config,
> +                                   PCIE_CONFIG_SPACE_SIZE),
>          VMSTATE_INT32_ARRAY_V(irq_state, PCIDevice, PCI_NUM_PINS, 2),
>          VMSTATE_END_OF_LIST()
>      }
>  };
>  
> +static inline const VMStateDescription *pci_get_vmstate(PCIDevice *s)
> +{
> +    return pci_is_express(s) ? &vmstate_pcie_device : &vmstate_pci_device;
> +}
> +
>  void pci_device_save(PCIDevice *s, QEMUFile *f)
>  {
> -    vmstate_save_state(f, &vmstate_pci_device, s);
> +    vmstate_save_state(f, pci_get_vmstate(s), s);
>  }
>  
>  int pci_device_load(PCIDevice *s, QEMUFile *f)
>  {
> -    return vmstate_load_state(f, &vmstate_pci_device, s, s->version_id);
> +    return vmstate_load_state(f, pci_get_vmstate(s), s, s->version_id);
>  }
>  
>  static int pci_set_default_subsystem_id(PCIDevice *pci_dev)
> @@ -406,14 +435,34 @@ static void pci_init_cmask(PCIDevice *dev)
>  static void pci_init_wmask(PCIDevice *dev)
>  {
>      int i;
> +    int config_size = pci_config_size(dev);
> +
>      dev->wmask[PCI_CACHE_LINE_SIZE] = 0xff;
>      dev->wmask[PCI_INTERRUPT_LINE] = 0xff;
>      pci_set_word(dev->wmask + PCI_COMMAND,
>                   PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
> -    for (i = PCI_CONFIG_HEADER_SIZE; i < PCI_CONFIG_SPACE_SIZE; ++i)
> +    for (i = PCI_CONFIG_HEADER_SIZE; i < config_size; ++i)
>          dev->wmask[i] = 0xff;

By the way, no idea why didn't I just memset it instead of a loop.
Let's fix?

>  }
>  
> +static void pci_config_alloc(PCIDevice *pci_dev)
> +{
> +    int config_size = pci_config_size(pci_dev);
> +
> +    pci_dev->config = qemu_mallocz(config_size);
> +    pci_dev->cmask = qemu_mallocz(config_size);
> +    pci_dev->wmask = qemu_mallocz(config_size);
> +    pci_dev->used = qemu_mallocz(config_size);
> +}
> +
> +static void pci_config_free(PCIDevice *pci_dev)
> +{
> +    qemu_free(pci_dev->config);
> +    qemu_free(pci_dev->cmask);
> +    qemu_free(pci_dev->wmask);
> +    qemu_free(pci_dev->used);
> +}
> +
>  /* -1 for devfn means auto assign */
>  static PCIDevice *do_pci_register_device(PCIDevice *pci_dev, PCIBus *bus,
>                                           const char *name, int devfn,
> @@ -434,6 +483,7 @@ static PCIDevice *do_pci_register_device(PCIDevice 
> *pci_dev, PCIBus *bus,
>      pci_dev->devfn = devfn;
>      pstrcpy(pci_dev->name, sizeof(pci_dev->name), name);
>      memset(pci_dev->irq_state, 0, sizeof(pci_dev->irq_state));
> +    pci_config_alloc(pci_dev);
>      pci_set_default_subsystem_id(pci_dev);
>      pci_init_cmask(pci_dev);
>      pci_init_wmask(pci_dev);
> @@ -501,6 +551,7 @@ static int pci_unregister_device(DeviceState *dev)
>  
>      qemu_free_irqs(pci_dev->irq);
>      pci_dev->bus->devices[pci_dev->devfn] = NULL;
> +    pci_config_free(pci_dev);
>      return 0;
>  }
>  
> @@ -641,7 +692,7 @@ uint32_t pci_default_read_config(PCIDevice *d,
>  {
>      uint32_t val = 0;
>      assert(len == 1 || len == 2 || len == 4);
> -    len = MIN(len, PCI_CONFIG_SPACE_SIZE - address);
> +    len = MIN(len, pci_config_size(d) - address);
>      memcpy(&val, d->config + address, len);
>      return le32_to_cpu(val);
>  }
> @@ -650,10 +701,11 @@ void pci_default_write_config(PCIDevice *d, uint32_t 
> addr, uint32_t val, int l)
>  {
>      uint8_t orig[PCI_CONFIG_SPACE_SIZE];
>      int i;
> +    uint32_t config_size = pci_config_size(d);
>  
>      /* not efficient, but simple */
>      memcpy(orig, d->config, PCI_CONFIG_SPACE_SIZE);
> -    for(i = 0; i < l && addr < PCI_CONFIG_SPACE_SIZE; val >>= 8, ++i, 
> ++addr) {
> +    for(i = 0; i < l && addr < config_size; val >>= 8, ++i, ++addr) {
>          uint8_t wmask = d->wmask[addr];
>          d->config[addr] = (d->config[addr] & ~wmask) | (val & wmask);
>      }
> @@ -1001,6 +1053,11 @@ static int pci_qdev_init(DeviceState *qdev, DeviceInfo 
> *base)
>      PCIBus *bus;
>      int devfn, rc;
>  
> +    /* initialize cap_present for pci_is_express() and pci_config_size() */
> +    if (info->is_express) {
> +        pci_dev->cap_present |= QEMU_PCI_CAP_EXPRESS;
> +    }
> +
>      bus = FROM_QBUS(PCIBus, qdev_get_parent_bus(qdev));
>      devfn = pci_dev->devfn;
>      pci_dev = do_pci_register_device(pci_dev, bus, base->name, devfn,

It would be better if we could have a separate pcie_init.
But no idea how to make it so. Ideas?

> @@ -1057,9 +1114,10 @@ PCIDevice *pci_create_simple(PCIBus *bus, int devfn, 
> const char *name)
>  
>  static int pci_find_space(PCIDevice *pdev, uint8_t size)
>  {
> +    int config_size = pci_config_size(pdev);
>      int offset = PCI_CONFIG_HEADER_SIZE;
>      int i;
> -    for (i = PCI_CONFIG_HEADER_SIZE; i < PCI_CONFIG_SPACE_SIZE; ++i)
> +    for (i = PCI_CONFIG_HEADER_SIZE; i < config_size; ++i)
>          if (pdev->used[i])
>              offset = i + 1;
>          else if (i - offset + 1 == size)
> diff --git a/hw/pci.h b/hw/pci.h
> index 4f4266d..8e5d64a 100644
> --- a/hw/pci.h
> +++ b/hw/pci.h
> @@ -163,28 +163,31 @@ typedef struct PCIIORegion {
>  #define PCI_CONFIG_HEADER_SIZE 0x40
>  /* Size of the standard PCI config space */
>  #define PCI_CONFIG_SPACE_SIZE 0x100
> +/* Size of the standart PCIe config space: 4KB */
> +#define PCIE_CONFIG_SPACE_SIZE  0x1000
>  
>  #define PCI_NUM_PINS 4 /* A-D */
>  
>  /* Bits in cap_present field. */
>  enum {
>      QEMU_PCI_CAP_MSIX = 0x1,
> +    QEMU_PCI_CAP_EXPRESS = 0x2,
>  };
>  
>  struct PCIDevice {
>      DeviceState qdev;
>      /* PCI config space */
> -    uint8_t config[PCI_CONFIG_SPACE_SIZE];
> +    uint8_t *config;
>  
>      /* Used to enable config checks on load. Note that writeable bits are
>       * never checked even if set in cmask. */
> -    uint8_t cmask[PCI_CONFIG_SPACE_SIZE];
> +    uint8_t *cmask;
>  
>      /* Used to implement R/W bytes */
> -    uint8_t wmask[PCI_CONFIG_SPACE_SIZE];
> +    uint8_t *wmask;
>  
>      /* Used to allocate config space for capabilities. */
> -    uint8_t used[PCI_CONFIG_SPACE_SIZE];
> +    uint8_t *used;
>  
>      /* the following fields are read only */
>      PCIBus *bus;
> @@ -354,6 +357,12 @@ typedef struct {
>      PCIUnregisterFunc *exit;
>      PCIConfigReadFunc *config_read;
>      PCIConfigWriteFunc *config_write;
> +
> +    /* pcie stuff */
> +    int is_express;   /* is this device pci express?
> +                       * initialization code needs to know this before
> +                       * each specific device initialization.
> +                       */

kill two last lines.

>  } PCIDeviceInfo;
>  
>  void pci_qdev_register(PCIDeviceInfo *info);
> @@ -362,6 +371,16 @@ void pci_qdev_register_many(PCIDeviceInfo *info);
>  PCIDevice *pci_create(PCIBus *bus, int devfn, const char *name);
>  PCIDevice *pci_create_simple(PCIBus *bus, int devfn, const char *name);
>  
> +static inline int pci_is_express(PCIDevice *d)
> +{
> +    return d->cap_present & QEMU_PCI_CAP_EXPRESS;
> +}
> +
> +static inline uint32_t pci_config_size(PCIDevice *d)
> +{
> +    return pci_is_express(d) ? PCIE_CONFIG_SPACE_SIZE : 
> PCI_CONFIG_SPACE_SIZE;
> +}
> +
>  /* lsi53c895a.c */
>  #define LSI_MAX_DEVS 7
>  
> diff --git a/hw/pcie_host.c b/hw/pcie_host.c
> new file mode 100644
> index 0000000..b52fec6
> --- /dev/null
> +++ b/hw/pcie_host.c
> @@ -0,0 +1,192 @@
> +/*
> + * pcie_host.c
> + * utility functions for pci express host bridge.
> + *
> + * Copyright (c) 2009 Isaku Yamahata <yamahata at valinux co jp>
> + *                    VA Linux Systems Japan K.K.
> + *
> + * 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, write to the Free Software Foundation, Inc.,
> + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
> + */
> +
> +#include "hw.h"
> +#include "pci.h"
> +#include "pcie_host.h"
> +
> +/*
> + * PCI express mmcfig address
> + * bit 20 - 28: bus number
> + * bit 15 - 19: device number
> + * bit 12 - 14: function number
> + * bit  0 - 11: offset in configuration space of a given device
> + */
> +#define PCIE_MMCFG_SIZE_MAX             (1ULL << 28)
> +#define PCIE_MMCFG_SIZE_MIN             (1ULL << 20)
> +#define PCIE_MMCFG_BUS_BIT              20
> +#define PCIE_MMCFG_BUS_MASK             0x1ff
> +#define PCIE_MMCFG_DEVFN_BIT            12
> +#define PCIE_MMCFG_DEVFN_MASK           0xff
> +#define PCIE_MMCFG_CONFOFFSET_MASK      0xfff
> +#define PCIE_MMCFG_BUS(addr)            (((addr) >> PCIE_MMCFG_BUS_BIT) & \
> +                                         PCIE_MMCFG_BUS_MASK)
> +#define PCIE_MMCFG_DEVFN(addr)          (((addr) >> PCIE_MMCFG_DEVFN_BIT) & \
> +                                         PCIE_MMCFG_DEVFN_MASK)
> +#define PCIE_MMCFG_CONFOFFSET(addr)     ((addr) & PCIE_MMCFG_CONFOFFSET_MASK)
> +
> +
> +/* a helper function to get a PCIDevice for a given mmconfig address */
> +static inline PCIDevice *pcie_mmcfg_addr_to_dev(PCIBus *s, uint32_t 
> mmcfg_addr)
> +{
> +    return pci_find_device(s, PCIE_MMCFG_BUS(mmcfg_addr),
> +                           PCI_SLOT(PCIE_MMCFG_DEVFN(mmcfg_addr)),
> +                           PCI_FUNC(PCIE_MMCFG_DEVFN(mmcfg_addr)));
> +}
> +
> +static void pcie_mmcfg_data_write(PCIBus *s,
> +                                  uint32_t mmcfg_addr, uint32_t val, int len)
> +{
> +    PCIDevice *pci_dev = pcie_mmcfg_addr_to_dev(s, mmcfg_addr);
> +
> +    if (!pci_dev)
> +        return;
> +
> +    pci_dev->config_write(pci_dev,
> +                          PCIE_MMCFG_CONFOFFSET(mmcfg_addr), val, len);
> +}
> +
> +static uint32_t pcie_mmcfg_data_read(PCIBus *s,
> +                                     uint32_t mmcfg_addr, int len)
> +{
> +    PCIDevice *pci_dev = pcie_mmcfg_addr_to_dev(s, mmcfg_addr);
> +    uint32_t val;
> +
> +    if (!pci_dev) {
> +        switch(len) {
> +        case 1:
> +            val = 0xff;
> +            break;
> +        case 2:
> +            val = 0xffff;
> +            break;
> +        default:
> +        case 4:
> +            val = 0xffffffff;
> +            break;
> +        }

use the memcpy hack?

> +    } else {
> +        val = pci_dev->config_read(pci_dev,
> +                                   PCIE_MMCFG_CONFOFFSET(mmcfg_addr), len);
> +    }
> +
> +    return val;
> +}
> +
> +static void pcie_mmcfg_data_writeb(void *opaque,
> +                                   target_phys_addr_t addr, uint32_t value)
> +{
> +    PCIExpressHost *e = opaque;
> +    pcie_mmcfg_data_write(e->pci.bus, addr - e->base_addr, value, 1);
> +}
> +
> +static void pcie_mmcfg_data_writew(void *opaque,
> +                                   target_phys_addr_t addr, uint32_t value)
> +{
> +    PCIExpressHost *e = opaque;
> +    pcie_mmcfg_data_write(e->pci.bus, addr - e->base_addr, value, 2);
> +}
> +
> +static void pcie_mmcfg_data_writel(void *opaque,
> +                                   target_phys_addr_t addr, uint32_t value)
> +{
> +    PCIExpressHost *e = opaque;
> +    pcie_mmcfg_data_write(e->pci.bus, addr - e->base_addr, value, 4);
> +}
> +
> +static uint32_t pcie_mmcfg_data_readb(void *opaque, target_phys_addr_t addr)
> +{
> +    PCIExpressHost *e = opaque;
> +    return pcie_mmcfg_data_read(e->pci.bus, addr - e->base_addr, 1);
> +}
> +
> +static uint32_t pcie_mmcfg_data_readw(void *opaque, target_phys_addr_t addr)
> +{
> +    PCIExpressHost *e = opaque;
> +    return pcie_mmcfg_data_read(e->pci.bus, addr - e->base_addr, 2);
> +}
> +
> +static uint32_t pcie_mmcfg_data_readl(void *opaque, target_phys_addr_t addr)
> +{
> +    PCIExpressHost *e = opaque;
> +    return pcie_mmcfg_data_read(e->pci.bus, addr - e->base_addr, 4);
> +}
> +
> +
> +static CPUWriteMemoryFunc * const pcie_mmcfg_write[] =
> +{
> +    pcie_mmcfg_data_writeb,
> +    pcie_mmcfg_data_writew,
> +    pcie_mmcfg_data_writel,
> +};
> +
> +static CPUReadMemoryFunc * const pcie_mmcfg_read[] =
> +{
> +    pcie_mmcfg_data_readb,
> +    pcie_mmcfg_data_readw,
> +    pcie_mmcfg_data_readl,
> +};
> +
> +/* pcie_host::base_addr == PCIE_BASE_ADDR_UNMAPPED when it isn't mapped. */
> +#define PCIE_BASE_ADDR_UNMAPPED  ((target_phys_addr_t)-1ULL)
> +
> +int pcie_host_init(PCIExpressHost *e)
> +{
> +    e->base_addr = PCIE_BASE_ADDR_UNMAPPED;
> +    e->mmio_index =
> +        cpu_register_io_memory(pcie_mmcfg_read, pcie_mmcfg_write, e);
> +    if (e->mmio_index < 0) {
> +        return -1;
> +    }
> +
> +    return 0;
> +}
> +
> +void pcie_host_mmcfg_unmap(PCIExpressHost *e)
> +{
> +    if (e->base_addr != PCIE_BASE_ADDR_UNMAPPED) {
> +        cpu_register_physical_memory(e->base_addr, e->size, 
> IO_MEM_UNASSIGNED);
> +        e->base_addr = PCIE_BASE_ADDR_UNMAPPED;
> +    }
> +}
> +
> +void pcie_host_mmcfg_map(PCIExpressHost *e,
> +                         target_phys_addr_t addr, uint32_t size)
> +{
> +    assert(!(size & (size - 1)));       /* power of 2 */
> +    assert(size >= PCIE_MMCFG_SIZE_MIN);
> +    assert(size <= PCIE_MMCFG_SIZE_MAX);
> +
> +    e->base_addr = addr;
> +    e->size = size;
> +    cpu_register_physical_memory(e->base_addr, e->size, e->mmio_index);
> +}
> +
> +void pcie_host_mmcfg_update(PCIExpressHost *e,
> +                            int enable,
> +                            target_phys_addr_t addr, uint32_t size)
> +{
> +    pcie_host_mmcfg_unmap(e);
> +    if (enable) {
> +        pcie_host_mmcfg_map(e, addr, size);
> +    }
> +}
> diff --git a/hw/pcie_host.h b/hw/pcie_host.h
> new file mode 100644
> index 0000000..a7771c9
> --- /dev/null
> +++ b/hw/pcie_host.h
> @@ -0,0 +1,50 @@
> +/*
> + * pcie_host.h
> + *
> + * Copyright (c) 2009 Isaku Yamahata <yamahata at valinux co jp>
> + *                    VA Linux Systems Japan K.K.
> + *
> + * 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, write to the Free Software Foundation, Inc.,
> + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
> + */
> +
> +#ifndef PCIE_HOST_H
> +#define PCIE_HOST_H
> +
> +#include "pci_host.h"
> +
> +typedef struct {

struct -> struct PCIExpressHost.
typedef can move to common.h then.

> +    PCIHostState pci;
> +
> +    /* express part */
> +
> +    /* base address where MMCONFIG area is mapped. */
> +    target_phys_addr_t  base_addr;
> +
> +    /* the size of MMCONFIG area. It's host bridge dependent */
> +    target_phys_addr_t  size;
> +
> +    /* result of cpu_register_io_memory() to map MMCONFIG area */
> +    int mmio_index;
> +} PCIExpressHost;
> +
> +int pcie_host_init(PCIExpressHost *e);
> +void pcie_host_mmcfg_unmap(PCIExpressHost *e);
> +void pcie_host_mmcfg_map(PCIExpressHost *e,
> +                         target_phys_addr_t addr, uint32_t size);
> +void pcie_host_mmcfg_update(PCIExpressHost *e,
> +                            int enable,
> +                            target_phys_addr_t addr, uint32_t size);
> +
> +#endif /* PCIE_HOST_H */
> -- 
> 1.6.0.2