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Re: [Xen-devel] [PATCH v2 20/21] libxl: Add support for non-PCI passthrough



On Thu, 31 Jul 2014, Julien Grall wrote:
> On ARM, every non-PCI device are described in the device tree. Each of them
> can be found via a path.
> 
> This path will be used to retrieved the different informations about the
> device (compatible string, interrupts, MMIOs). Libxl will take care of:
>     - Allocate the MMIOs regions for the device in the guest
>     - Create the device node in the guest device tree
>     - Map the IRQs and MMIOs range in the guest P2M
> 
> Note, that the device node won't contains specific properties for the node.
> Only generic one (compatible, interrupts, regs) will be created by libxl.
> 
> In the future, per-device properties will be added. Maybe via a configuration
> file listing what is needed.
> 
> Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
> Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
> Cc: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
> 
> ---
>     Changes in v2:
>         - Get DT infos earlier
>         - Allocate/map IRQ in libxl__arch_domain_create rather than in
>         libxl__device_dt_add

I understand why you moved it earlier but if it is not too hard I would
suggest to try to keep mmio and irq mapping all together, because it
would make the code much easier to read and modify in the future, being
all in one place.

The rest looks OK.


>         - Use VIRQ rather than the PIRQ to construct the interrupts
>         properties of the device tree
>         - Correct cpumask in make_dtdev_node. We allow the interrupt to
>         be used on the 8 CPUs
>         - Fix LOGE when we map the MMIO region in the guest in
>         libxl__device_dt_add. The domain and the IRQ were inverted
>         - Calculate the number of SPIs to configure the VGIC
>         - xc_physdev_dtdev_* helpers has been renamed to xc_dtdev_*
>         - Rename libxl_device_dt to libxl_device_dtdev
> ---
>  tools/libxl/Makefile         |    2 +-
>  tools/libxl/libxl_arch.h     |    4 +-
>  tools/libxl/libxl_arm.c      |  129 ++++++++++++++++++++++++++++++++++-
>  tools/libxl/libxl_create.c   |   27 ++++++++
>  tools/libxl/libxl_dom.c      |    5 +-
>  tools/libxl/libxl_dtdev.c    |  153 
> ++++++++++++++++++++++++++++++++++++++++++
>  tools/libxl/libxl_internal.h |   32 +++++++++
>  tools/libxl/libxl_types.idl  |    5 ++
>  tools/libxl/libxl_x86.c      |    4 +-
>  9 files changed, 355 insertions(+), 6 deletions(-)
>  create mode 100644 tools/libxl/libxl_dtdev.c
> 
> diff --git a/tools/libxl/Makefile b/tools/libxl/Makefile
> index bd0db3b..dc38216 100644
> --- a/tools/libxl/Makefile
> +++ b/tools/libxl/Makefile
> @@ -81,7 +81,7 @@ LIBXL_OBJS = flexarray.o libxl.o libxl_create.o libxl_dm.o 
> libxl_pci.o \
>                       libxl_json.o libxl_aoutils.o libxl_numa.o \
>                       libxl_save_callout.o _libxl_save_msgs_callout.o \
>                       libxl_qmp.o libxl_event.o libxl_fork.o $(LIBXL_OBJS-y)
> -LIBXL_OBJS += libxl_genid.o
> +LIBXL_OBJS += libxl_genid.o libxl_dtdev.o
>  LIBXL_OBJS += _libxl_types.o libxl_flask.o _libxl_types_internal.o
>  
>  LIBXL_TESTS += timedereg
> diff --git a/tools/libxl/libxl_arch.h b/tools/libxl/libxl_arch.h
> index 454f8db..9532f02 100644
> --- a/tools/libxl/libxl_arch.h
> +++ b/tools/libxl/libxl_arch.h
> @@ -20,11 +20,13 @@ int libxl__arch_domain_create_pre(libxl__gc *gc, 
> libxl_domain_config *d_config,
>                                    libxl__domain_build_state *state,
>                                    uint32_t domid);
>  int libxl__arch_domain_create(libxl__gc *gc, libxl_domain_config *d_config,
> -               uint32_t domid);
> +                              libxl__domain_build_state *state,
> +                              uint32_t domid);
>  
>  /* setup arch specific hardware description, i.e. DTB on ARM */
>  int libxl__arch_domain_init_hw_description(libxl__gc *gc,
>                                             libxl_domain_build_info *info,
> +                                           libxl__domain_build_state *state,
>                                             struct xc_dom_image *dom);
>  /* finalize arch specific hardware description. */
>  int libxl__arch_domain_finalise_hw_description(libxl__gc *gc,
> diff --git a/tools/libxl/libxl_arm.c b/tools/libxl/libxl_arm.c
> index b0491c3..0609f86 100644
> --- a/tools/libxl/libxl_arm.c
> +++ b/tools/libxl/libxl_arm.c
> @@ -27,8 +27,12 @@ int libxl__arch_domain_create_pre(libxl__gc *gc, 
> libxl_domain_config *d_config,
>                                    libxl__domain_build_state *state,
>                                    uint32_t domid)
>  {
> +    int dev_index;
>      uint32_t nr_spis = 0;
>  
> +    for (dev_index = 0; dev_index < d_config->num_dtdevs; dev_index++)
> +        nr_spis += state->dtdevs_info[dev_index].num_irqs;
> +
>      nr_spis += d_config->b_info.num_irqs;
>  
>      LOG(DEBUG, "Allocate %u SPIs\n", nr_spis);
> @@ -43,8 +47,60 @@ int libxl__arch_domain_create_pre(libxl__gc *gc, 
> libxl_domain_config *d_config,
>  
>  
>  int libxl__arch_domain_create(libxl__gc *gc, libxl_domain_config *d_config,
> +                              libxl__domain_build_state *state,
>                                uint32_t domid)
>  {
> +    int dev_index;
> +    uint32_t mmio_index;
> +    uint64_t mmiocurr = GUEST_MMIO_BASE >> XC_PAGE_SHIFT;
> +    /* Convenient */
> +    const uint64_t mmioend = (GUEST_MMIO_BASE + GUEST_MMIO_SIZE) >> 
> XC_PAGE_SHIFT;
> +    uint32_t i;
> +    int ret;
> +
> +    for (dev_index = 0; dev_index < d_config->num_dtdevs; dev_index++) {
> +        const libxl_device_dtdev *dtdev = &d_config->dtdevs[dev_index];
> +        libxl__dtdev_info *info = &state->dtdevs_info[dev_index];
> +
> +        LOG(DEBUG, "Allocate %d MMIOs region for \"%s\"",
> +            info->num_mmios, dtdev->path);
> +        for (mmio_index = 0; mmio_index < info->num_mmios; mmio_index++) {
> +            libxl_iomem_range *io = &info->mmios[mmio_index];
> +
> +            /* Check if we have enough space for the MMIO region */
> +            /* TODO: Do I need to check overlap? */
> +            if ((mmiocurr + io->number) > mmioend) {
> +                LOG(ERROR, "Not enough space in the guest layout to allocate 
> the MMIOs regions");
> +                return -ENOMEM;
> +            }
> +            LOG(DEBUG, "\t0x%"PRIx64"-0x%"PRIx64,
> +                mmiocurr, mmiocurr + io->number);
> +            io->gfn = mmiocurr;
> +            mmiocurr += io->number;
> +        }
> +
> +        LOG(DEBUG, "Allocate %d virtual IRQs for \"%s\n",
> +            info->num_irqs, dtdev->path);
> +        for (i = 0; i < info->num_irqs; i++) {
> +            int virq;
> +            int irq = info->irqs[i].irq;
> +
> +            /* xc_physdev_map_pirq will both assign the IRQ to the guest
> +             * and allocate a virtual IRQ number, we need it early in
> +             * order to generate the device tree
> +             */
> +            ret = xc_physdev_map_pirq(CTX->xch, domid, irq, &virq);
> +            if (ret < 0) {
> +                LOGE(ERROR, "%s: failed to map the IRQ %u into dom%u\n",
> +                     info->conf->path, irq, domid);
> +                return ret;
> +            }
> +
> +            info->irqs[i].virq = virq;
> +            LOG(DEBUG, "\t irq %u -> virq %u\n", irq, virq);
> +        }
> +    }
> +
>      return 0;
>  }
>  
> @@ -431,6 +487,72 @@ static int make_hypervisor_node(libxl__gc *gc, void *fdt,
>      return 0;
>  }
>  
> +static int make_dtdev_node(libxl__gc *gc, void *fdt,
> +                           int index, const libxl__dtdev_info *dtdev)
> +{
> +    const char *name;
> +    uint32_t i;
> +    int res;
> +
> +    /* The unit-address (after @) is only request when the device has MMIO */
> +    if (dtdev->num_mmios > 0) {
> +        uint64_t base = dtdev->mmios[0].gfn << XC_PAGE_SHIFT;
> +
> +        name = GCSPRINTF("dtdev-%u@%"PRIx64, index, base);
> +    } else
> +        name = GCSPRINTF("dtdev-%u", index);
> +
> +    res = fdt_begin_node(fdt, name);
> +    if (res) return res;
> +
> +    assert(dtdev->compat_len != 0);
> +    fdt_property(fdt, "compatible", dtdev->compat, dtdev->compat_len);
> +
> +    if (dtdev->num_mmios > 0) {
> +        be32 *regs, *cells;
> +        /* Convenient */
> +        const unsigned addr_cells = ROOT_ADDRESS_CELLS;
> +        const unsigned size_cells = ROOT_SIZE_CELLS;
> +        const unsigned len = sizeof(*regs) * (addr_cells + size_cells);
> +
> +        regs = libxl__malloc(gc, len);
> +        cells = &regs[0];
> +
> +        for (i = 0; i < dtdev->num_mmios; i++) {
> +            uint64_t base = dtdev->mmios[i].gfn << XC_PAGE_SHIFT;
> +            uint64_t size = dtdev->mmios[i].number << XC_PAGE_SHIFT;
> +
> +            set_range(&cells, addr_cells, size_cells, base, size);
> +        }
> +
> +        res = fdt_property(fdt, "reg", regs, len);
> +        if (res) return res;
> +    }
> +
> +    if (dtdev->num_irqs > 0) {
> +        gic_interrupt *ints;
> +
> +        ints = libxl__malloc(gc, sizeof(*ints) * dtdev->num_irqs);
> +        for (i =0; i < dtdev->num_irqs; i++) {
> +            /* TODO: Translate the IRQ type into DT type. We should
> +             * not assume a 1:1 mapping */
> +            /* For now, Xen is only handling SPIs passthrough and
> +             * forward to VCPU0
> +             */
> +            assert(dtdev->irqs[i].irq >= 32);
> +            set_interrupt(ints[i], dtdev->irqs[i].virq,
> +                          0xf, dtdev->irqs[i].type);
> +        }
> +
> +        res = fdt_property_interrupts(gc, fdt, ints, dtdev->num_irqs);
> +    }
> +
> +    res = fdt_end_node(fdt);
> +    if (res) return res;
> +
> +    return 0;
> +}
> +
>  static const struct arch_info *get_arch_info(libxl__gc *gc,
>                                               const struct xc_dom_image *dom)
>  {
> @@ -473,10 +595,11 @@ out:
>  
>  int libxl__arch_domain_init_hw_description(libxl__gc *gc,
>                                             libxl_domain_build_info *info,
> +                                           libxl__domain_build_state *state,
>                                             struct xc_dom_image *dom)
>  {
>      void *fdt = NULL;
> -    int rc, res;
> +    int rc, res, i;
>      size_t fdt_size = 0;
>  
>      const libxl_version_info *vers;
> @@ -546,6 +669,10 @@ next_resize:
>          FDT( make_timer_node(gc, fdt, ainfo) );
>          FDT( make_hypervisor_node(gc, fdt, vers) );
>  
> +        for (i = 0; i < state->num_dtdevs; i++) {
> +            FDT( make_dtdev_node(gc, fdt, i, &state->dtdevs_info[i]) );
> +        }
> +
>          FDT( fdt_end_node(fdt) );
>  
>          FDT( fdt_finish(fdt) );
> diff --git a/tools/libxl/libxl_create.c b/tools/libxl/libxl_create.c
> index 1bcee8b..6cb7c69 100644
> --- a/tools/libxl/libxl_create.c
> +++ b/tools/libxl/libxl_create.c
> @@ -731,6 +731,7 @@ static void initiate_domain_create(libxl__egc *egc,
>      /* convenience aliases */
>      libxl_domain_config *const d_config = dcs->guest_config;
>      const int restore_fd = dcs->restore_fd;
> +    libxl__domain_build_state *state = &dcs->build_state;
>      memset(&dcs->build_state, 0, sizeof(dcs->build_state));
>  
>      domid = 0;
> @@ -866,6 +867,21 @@ static void initiate_domain_create(libxl__egc *egc,
>              d_config->nics[i].devid = ++last_devid;
>      }
>  
> +    /* We need to retrieve DT devs information early to be able to
> +     * configure the domain correctly (i.e allocate GFN for each MMIO
> +     * regions, get the number of SPIs...) */
> +    state->num_dtdevs = d_config->num_dtdevs;
> +    state->dtdevs_info = libxl__calloc(gc, sizeof(*state->dtdevs_info),
> +                                       d_config->num_dtdevs);
> +    for (i = 0; i < d_config->num_dtdevs; i++) {
> +        ret = libxl__device_dt_get_info(gc, &d_config->dtdevs[i],
> +                                        &state->dtdevs_info[i]);
> +        if (ret) {
> +            LOG(ERROR, "libxl__device_dt_get_info failed: %d", ret);
> +            goto error_out;
> +        }
> +    }
> +
>      if (restore_fd >= 0) {
>          LOG(DEBUG, "restoring, not running bootloader\n");
>          domcreate_bootloader_done(egc, &dcs->bl, 0);
> @@ -1391,6 +1407,7 @@ static void domcreate_attach_pci(libxl__egc *egc, 
> libxl__multidev *multidev,
>  
>      /* convenience aliases */
>      libxl_domain_config *const d_config = dcs->guest_config;
> +    libxl__domain_build_state *const state = &dcs->build_state;
>  
>      if (ret) {
>          LOG(ERROR, "unable to add vtpm devices");
> @@ -1416,6 +1433,16 @@ static void domcreate_attach_pci(libxl__egc *egc, 
> libxl__multidev *multidev,
>          }
>      }
>  
> +    for (i = 0; i < d_config->num_dtdevs; i++) {
> +
> +        ret = libxl__device_dt_add(gc, domid, &state->dtdevs_info[i]);
> +        if (ret < 0) {
> +            LIBXL__LOG(ctx, LIBXL__LOG_ERROR,
> +                       "libxl__device_dt_add failed: %d\n", ret);
> +            goto error_out;
> +        }
> +    }
> +
>      domcreate_console_available(egc, dcs);
>  
>      domcreate_complete(egc, dcs, 0);
> diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c
> index a0e4e34..d605a62 100644
> --- a/tools/libxl/libxl_dom.c
> +++ b/tools/libxl/libxl_dom.c
> @@ -357,7 +357,7 @@ int libxl__build_pre(libxl__gc *gc, uint32_t domid,
>      if (info->type == LIBXL_DOMAIN_TYPE_HVM)
>          hvm_set_conf_params(ctx->xch, domid, info);
>  
> -    rc = libxl__arch_domain_create(gc, d_config, domid);
> +    rc = libxl__arch_domain_create(gc, d_config, state, domid);
>  
>      return rc;
>  }
> @@ -509,7 +509,8 @@ int libxl__build_pv(libxl__gc *gc, uint32_t domid,
>          LOGE(ERROR, "xc_dom_parse_image failed");
>          goto out;
>      }
> -    if ( (ret = libxl__arch_domain_init_hw_description(gc, info, dom)) != 0 
> ) {
> +    ret = libxl__arch_domain_init_hw_description(gc, info, state, dom);
> +    if ( ret != 0 ) {
>          LOGE(ERROR, "libxl__arch_domain_init_hw_description failed");
>          goto out;
>      }
> diff --git a/tools/libxl/libxl_dtdev.c b/tools/libxl/libxl_dtdev.c
> new file mode 100644
> index 0000000..6eb3f07
> --- /dev/null
> +++ b/tools/libxl/libxl_dtdev.c
> @@ -0,0 +1,153 @@
> +/*
> + * Copyright (C) 2014      Linaro Limited.
> + * Author Julien Grall <julien.grall@xxxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU Lesser General Public License as published
> + * by the Free Software Foundation; version 2.1 only. with the special
> + * exception on linking described in file LICENSE.
> + *
> + * 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 Lesser General Public License for more details.
> + */
> +
> +#include "libxl_osdeps.h" /* Must come before other headers */
> +
> +#include "libxl_internal.h"
> +
> +int libxl__device_dt_add(libxl__gc *gc, uint32_t domid,
> +                         const libxl__dtdev_info *dtdev)
> +{
> +    uint32_t i;
> +    int ret;
> +
> +    LOG(DEBUG, "Assign device \"%s\" to dom%u", dtdev->conf->path, domid);
> +
> +    for (i = 0; i < dtdev->num_mmios; i++) {
> +        const libxl_iomem_range *io = &dtdev->mmios[i];
> +
> +        ret = xc_domain_iomem_permission(CTX->xch, domid, io->start,
> +                                         io->number, 1);
> +        if (ret < 0) {
> +            LOGE(ERROR,
> +                 "%s: failed to give dom%d access to iomem range"
> +                 "%"PRIx64"-%"PRIx64, dtdev->conf->path,
> +                 domid, io->start, io->start + io->number + 1);
> +            return ret;
> +        }
> +
> +        ret = xc_domain_memory_mapping(CTX->xch, domid, io->gfn,
> +                                       io->start, io->number, 1);
> +        if (ret < 0) {
> +            LOGE(ERROR,
> +                "%s: failed to map to dom%u iomem range %"PRIx64"-%"PRIx64
> +                " to guest address %"PRIx64,
> +                dtdev->conf->path, domid, io->start,
> +                io->start + io->number - 1, io->gfn);
> +            return ret;
> +        }
> +    }
> +
> +    /* IRQs are already assigned in libxl__arch_domain_create because
> +     * it's at the same time used to allocate the virtual IRQ number
> +     */
> +
> +    return xc_assign_dt_device(CTX->xch, domid, dtdev->conf->path);
> +}
> +
> +int libxl__device_dt_get_info(libxl__gc *gc,
> +                              const libxl_device_dtdev *dtdev,
> +                              libxl__dtdev_info *dtinfo)
> +{
> +    xc_dtdev_info_t info;
> +    int ret = 0;
> +    uint32_t i;
> +    char *buff;
> +    uint32_t len;
> +
> +    LOG(DEBUG, "Get information for DT dev \"%s\"", dtdev->path);
> +
> +    ret = xc_dtdev_getinfo(CTX->xch, dtdev->path, &info);
> +    if (ret) {
> +        LOGE(ERROR, "Unable to get the informations for \"%s\"",
> +             dtdev->path);
> +        return ret;
> +    }
> +
> +    LOG(DEBUG, "num_irqs = %u num_mmios = %u compat_len = %u",
> +        info.num_irqs, info.num_mmios, info.compat_len);
> +
> +    dtinfo->conf = dtdev;
> +
> +    /* Retrieve the IRQs */
> +    dtinfo->num_irqs = info.num_irqs;
> +    dtinfo->irqs = libxl__calloc(gc, dtinfo->num_irqs,
> +                                 sizeof(*dtinfo->mmios));
> +
> +    LOG(DEBUG, "List of IRQs");
> +    for (i = 0; i < dtinfo->num_irqs; i++) {
> +        xc_dtdev_irq_t irq;
> +
> +        ret = xc_dtdev_getirq(CTX->xch, dtdev->path, i, &irq);
> +        if (ret) {
> +            LOGE(ERROR, "Unable to get IRQ%u for \"%s\"", i, dtdev->path);
> +            return ret;
> +        }
> +
> +        LOG(DEBUG, "\t- irq = %u type = %u", irq.irq, irq.type);
> +
> +        dtinfo->irqs[i].irq = irq.irq;
> +        /* TODO translate the type correctly */
> +        dtinfo->irqs[i].type = irq.type;
> +    }
> +
> +    /* Retrieve the MMIOs range */
> +    dtinfo->num_mmios = info.num_mmios;
> +    dtinfo->mmios =  libxl__calloc(gc, dtinfo->num_mmios,
> +                                   sizeof(*dtinfo->mmios));
> +
> +    LOG(DEBUG, "List of MMIOs");
> +    for (i = 0; i < dtinfo->num_mmios; i++) {
> +        xc_dtdev_mmio_t mmio;
> +
> +        ret = xc_dtdev_getmmio(CTX->xch, dtdev->path, i, &mmio);
> +        if (ret) {
> +            LOGE(ERROR, "Unable to get the MMIO range %u for \"%s\"",
> +                 i, dtdev->path);
> +            return ret;
> +        }
> +
> +        LOG(DEBUG, "\t- mfn = 0x%"PRIx64" nr_mfn = 0x%"PRIx64,
> +            mmio.mfn, mmio.nr_mfn);
> +
> +        dtinfo->mmios[i].start = mmio.mfn;
> +        dtinfo->mmios[i].number = mmio.nr_mfn;
> +        dtinfo->mmios[i].gfn = LIBXL_INVALID_GFN;
> +    }
> +
> +    /* Retrieve the compatible property */
> +    len = info.compat_len;
> +    buff = libxl__malloc(gc, len);
> +
> +    ret = xc_dtdev_getcompat(CTX->xch, dtdev->path,
> +                             buff, &len);
> +    if (ret) {
> +        LOGE(ERROR, "Unable to get the compatible string for \"%s\"",
> +             dtdev->path);
> +        return ret;
> +    }
> +    dtinfo->compat_len = len;
> +    dtinfo->compat = buff;
> +
> +    return 0;
> +}
> +
> +/*
> + * Local variables:
> + * mode: C
> + * c-basic-offset: 4
> + * indent-tabs-mode: nil
> + * End:
> + */
> diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
> index 04c9378..2231b76 100644
> --- a/tools/libxl/libxl_internal.h
> +++ b/tools/libxl/libxl_internal.h
> @@ -944,6 +944,26 @@ typedef struct {
>  _hidden int libxl__file_reference_map(libxl__file_reference *f);
>  _hidden int libxl__file_reference_unmap(libxl__file_reference *f);
>  
> +/* DT dev representation */
> +typedef struct {
> +    uint32_t num_mmios;
> +    libxl_iomem_range *mmios;
> +
> +    uint32_t num_irqs;
> +    struct
> +    {
> +        uint32_t irq;
> +        uint32_t virq;
> +        uint32_t type;
> +    } *irqs;
> +
> +    const char *compat;
> +    ssize_t compat_len; /* The compatible string may contain \0 */
> +
> +    /* Short-hand to the User configuration for this device */
> +    const libxl_device_dtdev *conf;
> +} libxl__dtdev_info;
> +
>  /* from xl_dom */
>  _hidden libxl_domain_type libxl__domain_type(libxl__gc *gc, uint32_t domid);
>  _hidden int libxl__domain_shutdown_reason(libxl__gc *gc, uint32_t domid);
> @@ -967,6 +987,9 @@ typedef struct {
>      libxl__file_reference pv_ramdisk;
>      const char * pv_cmdline;
>      bool pvh_enabled;
> +
> +    int num_dtdevs;
> +    libxl__dtdev_info *dtdevs_info;
>  } libxl__domain_build_state;
>  
>  _hidden int libxl__build_pre(libxl__gc *gc, uint32_t domid,
> @@ -1150,6 +1173,15 @@ _hidden int libxl__create_pci_backend(libxl__gc *gc, 
> uint32_t domid,
>                                        libxl_device_pci *pcidev, int num);
>  _hidden int libxl__device_pci_destroy_all(libxl__gc *gc, uint32_t domid);
>  
> +/* from libxl_dtdev */
> +
> +_hidden int libxl__device_dt_add(libxl__gc *gc, uint32_t domid,
> +                                 const libxl__dtdev_info *info);
> +_hidden int libxl__device_dt_get_info(libxl__gc *gc,
> +                                      const libxl_device_dtdev *dtdev,
> +                                      libxl__dtdev_info *info);
> +
> +
>  /*----- xswait: wait for a xenstore node to be suitable -----*/
>  
>  typedef struct libxl__xswait_state libxl__xswait_state;
> diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
> index 874cc49..03a4367 100644
> --- a/tools/libxl/libxl_types.idl
> +++ b/tools/libxl/libxl_types.idl
> @@ -477,6 +477,10 @@ libxl_device_pci = Struct("device_pci", [
>      ("seize", bool),
>      ])
>  
> +libxl_device_dtdev = Struct("device_dtdev", [
> +    ("path", string),
> +    ])
> +
>  libxl_device_vtpm = Struct("device_vtpm", [
>      ("backend_domid",    libxl_domid),
>      ("backend_domname",  string),
> @@ -491,6 +495,7 @@ libxl_domain_config = Struct("domain_config", [
>      ("disks", Array(libxl_device_disk, "num_disks")),
>      ("nics", Array(libxl_device_nic, "num_nics")),
>      ("pcidevs", Array(libxl_device_pci, "num_pcidevs")),
> +    ("dtdevs", Array(libxl_device_dtdev, "num_dtdevs")),
>      ("vfbs", Array(libxl_device_vfb, "num_vfbs")),
>      ("vkbs", Array(libxl_device_vkb, "num_vkbs")),
>      ("vtpms", Array(libxl_device_vtpm, "num_vtpms")),
> diff --git a/tools/libxl/libxl_x86.c b/tools/libxl/libxl_x86.c
> index 0abc1aa..17807c2 100644
> --- a/tools/libxl/libxl_x86.c
> +++ b/tools/libxl/libxl_x86.c
> @@ -252,7 +252,8 @@ int libxl__arch_domain_create_pre(libxl__gc *gc, 
> libxl_domain_config *d_config,
>  }
>  
>  int libxl__arch_domain_create(libxl__gc *gc, libxl_domain_config *d_config,
> -        uint32_t domid)
> +                              libxl__domain_build_state *state,
> +                              uint32_t domid)
>  {
>      int ret = 0;
>      int tsc_mode;
> @@ -320,6 +321,7 @@ int libxl__arch_domain_create(libxl__gc *gc, 
> libxl_domain_config *d_config,
>  
>  int libxl__arch_domain_init_hw_description(libxl__gc *gc,
>                                             libxl_domain_build_info *info,
> +                                           libxl__domain_build_state *state,
>                                             struct xc_dom_image *dom)
>  {
>      return 0;
> -- 
> 1.7.10.4
> 

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