Archipelago » qemu

/*

 * Copyright (c) 2007, Neocleus Corporation.

 * Copyright (c) 2007, Intel Corporation.

 *

 * This work is licensed under the terms of the GNU GPL, version 2.  See

 * the COPYING file in the top-level directory.

 *

 * Alex Novik <alex@neocleus.com>

 * Allen Kay <allen.m.kay@intel.com>

 * Guy Zana <guy@neocleus.com>

 *

 * This file implements direct PCI assignment to a HVM guest

 */

/*

 * Interrupt Disable policy:

 *

 * INTx interrupt:

 *   Initialize(register_real_device)

 *     Map INTx(xc_physdev_map_pirq):

 *       <fail>

 *         - Set real Interrupt Disable bit to '1'.

 *         - Set machine_irq and assigned_device->machine_irq to '0'.

 *         * Don't bind INTx.

 *

 *     Bind INTx(xc_domain_bind_pt_pci_irq):

 *       <fail>

 *         - Set real Interrupt Disable bit to '1'.

 *         - Unmap INTx.

 *         - Decrement xen_pt_mapped_machine_irq[machine_irq]

 *         - Set assigned_device->machine_irq to '0'.

 *

 *   Write to Interrupt Disable bit by guest software(xen_pt_cmd_reg_write)

 *     Write '0'

 *       - Set real bit to '0' if assigned_device->machine_irq isn't '0'.

 *

 *     Write '1'

 *       - Set real bit to '1'.

 *

 * MSI interrupt:

 *   Initialize MSI register(xen_pt_msi_setup, xen_pt_msi_update)

 *     Bind MSI(xc_domain_update_msi_irq)

 *       <fail>

 *         - Unmap MSI.

 *         - Set dev->msi->pirq to '-1'.

 *

 * MSI-X interrupt:

 *   Initialize MSI-X register(xen_pt_msix_update_one)

 *     Bind MSI-X(xc_domain_update_msi_irq)

 *       <fail>

 *         - Unmap MSI-X.

 *         - Set entry->pirq to '-1'.

 */

#include <sys/ioctl.h>

#include "pci.h"

#include "xen.h"

#include "xen_backend.h"

#include "xen_pt.h"

#include "range.h"

#define XEN_PT_NR_IRQS (256)

static uint8_t xen_pt_mapped_machine_irq[XEN_PT_NR_IRQS] = {0};

void xen_pt_log(const PCIDevice *d, const char *f, ...)

{

    va_list ap;

    va_start(ap, f);

    if (d) {

        fprintf(stderr, "[%02x:%02x.%d] ", pci_bus_num(d->bus),

                PCI_SLOT(d->devfn), PCI_FUNC(d->devfn));

    }

    vfprintf(stderr, f, ap);

    va_end(ap);

}

/* Config Space */

static int xen_pt_pci_config_access_check(PCIDevice *d, uint32_t addr, int len)

{

    /* check offset range */

    if (addr >= 0xFF) {

        XEN_PT_ERR(d, "Failed to access register with offset exceeding 0xFF. "

                   "(addr: 0x%02x, len: %d)\n", addr, len);

        return -1;

    }

    /* check read size */

    if ((len != 1) && (len != 2) && (len != 4)) {

        XEN_PT_ERR(d, "Failed to access register with invalid access length. "

                   "(addr: 0x%02x, len: %d)\n", addr, len);

        return -1;

    }

    /* check offset alignment */

    if (addr & (len - 1)) {

        XEN_PT_ERR(d, "Failed to access register with invalid access size "

                   "alignment. (addr: 0x%02x, len: %d)\n", addr, len);

        return -1;

    }

    return 0;

}

int xen_pt_bar_offset_to_index(uint32_t offset)

{

    int index = 0;

    /* check Exp ROM BAR */

    if (offset == PCI_ROM_ADDRESS) {

        return PCI_ROM_SLOT;

    }

    /* calculate BAR index */

    index = (offset - PCI_BASE_ADDRESS_0) >> 2;

    if (index >= PCI_NUM_REGIONS) {

        return -1;

    }

    return index;

}

static uint32_t xen_pt_pci_read_config(PCIDevice *d, uint32_t addr, int len)

{

    XenPCIPassthroughState *s = DO_UPCAST(XenPCIPassthroughState, dev, d);

    uint32_t val = 0;

    XenPTRegGroup *reg_grp_entry = NULL;

    XenPTReg *reg_entry = NULL;

    int rc = 0;

    int emul_len = 0;

    uint32_t find_addr = addr;

    if (xen_pt_pci_config_access_check(d, addr, len)) {

        goto exit;

    }

    /* find register group entry */

    reg_grp_entry = xen_pt_find_reg_grp(s, addr);

    if (reg_grp_entry) {

        /* check 0-Hardwired register group */

        if (reg_grp_entry->reg_grp->grp_type == XEN_PT_GRP_TYPE_HARDWIRED) {

            /* no need to emulate, just return 0 */

            val = 0;

            goto exit;

        }

    }

    /* read I/O device register value */

    rc = xen_host_pci_get_block(&s->real_device, addr, (uint8_t *)&val, len);

    if (rc < 0) {

        XEN_PT_ERR(d, "pci_read_block failed. return value: %d.\n", rc);

        memset(&val, 0xff, len);

    }

    /* just return the I/O device register value for

     * passthrough type register group */

    if (reg_grp_entry == NULL) {

        goto exit;

    }

    /* adjust the read value to appropriate CFC-CFF window */

    val <<= (addr & 3) << 3;

    emul_len = len;

    /* loop around the guest requested size */

    while (emul_len > 0) {

        /* find register entry to be emulated */

        reg_entry = xen_pt_find_reg(reg_grp_entry, find_addr);

        if (reg_entry) {

            XenPTRegInfo *reg = reg_entry->reg;

            uint32_t real_offset = reg_grp_entry->base_offset + reg->offset;

            uint32_t valid_mask = 0xFFFFFFFF >> ((4 - emul_len) << 3);

            uint8_t *ptr_val = NULL;

            valid_mask <<= (find_addr - real_offset) << 3;

            ptr_val = (uint8_t *)&val + (real_offset & 3);

            /* do emulation based on register size */

            switch (reg->size) {

            case 1:

                if (reg->u.b.read) {

                    rc = reg->u.b.read(s, reg_entry, ptr_val, valid_mask);

                }

                break;

            case 2:

                if (reg->u.w.read) {

                    rc = reg->u.w.read(s, reg_entry,

                                       (uint16_t *)ptr_val, valid_mask);

                }

                break;

            case 4:

                if (reg->u.dw.read) {

                    rc = reg->u.dw.read(s, reg_entry,

                                        (uint32_t *)ptr_val, valid_mask);

                }

                break;

            }

            if (rc < 0) {

                xen_shutdown_fatal_error("Internal error: Invalid read "

                                         "emulation. (%s, rc: %d)\n",

                                         __func__, rc);

                return 0;

            }

            /* calculate next address to find */

            emul_len -= reg->size;

            if (emul_len > 0) {

                find_addr = real_offset + reg->size;

            }

        } else {

            /* nothing to do with passthrough type register,

             * continue to find next byte */

            emul_len--;

            find_addr++;

        }

    }

    /* need to shift back before returning them to pci bus emulator */

    val >>= ((addr & 3) << 3);

exit:

    XEN_PT_LOG_CONFIG(d, addr, val, len);

    return val;

}

static void xen_pt_pci_write_config(PCIDevice *d, uint32_t addr,

                                    uint32_t val, int len)

{

    XenPCIPassthroughState *s = DO_UPCAST(XenPCIPassthroughState, dev, d);

    int index = 0;

    XenPTRegGroup *reg_grp_entry = NULL;

    int rc = 0;

    uint32_t read_val = 0;

    int emul_len = 0;

    XenPTReg *reg_entry = NULL;

    uint32_t find_addr = addr;

    XenPTRegInfo *reg = NULL;

    if (xen_pt_pci_config_access_check(d, addr, len)) {

        return;

    }

    XEN_PT_LOG_CONFIG(d, addr, val, len);

    /* check unused BAR register */

    index = xen_pt_bar_offset_to_index(addr);

    if ((index >= 0) && (val > 0 && val < XEN_PT_BAR_ALLF) &&

        (s->bases[index].bar_flag == XEN_PT_BAR_FLAG_UNUSED)) {

        XEN_PT_WARN(d, "Guest attempt to set address to unused Base Address "

                    "Register. (addr: 0x%02x, len: %d)\n", addr, len);

    }

    /* find register group entry */

    reg_grp_entry = xen_pt_find_reg_grp(s, addr);

    if (reg_grp_entry) {

        /* check 0-Hardwired register group */

        if (reg_grp_entry->reg_grp->grp_type == XEN_PT_GRP_TYPE_HARDWIRED) {

            /* ignore silently */

            XEN_PT_WARN(d, "Access to 0-Hardwired register. "

                        "(addr: 0x%02x, len: %d)\n", addr, len);

            return;

        }

    }

    rc = xen_host_pci_get_block(&s->real_device, addr,

                                (uint8_t *)&read_val, len);

    if (rc < 0) {

        XEN_PT_ERR(d, "pci_read_block failed. return value: %d.\n", rc);

        memset(&read_val, 0xff, len);

    }

    /* pass directly to the real device for passthrough type register group */

    if (reg_grp_entry == NULL) {

        goto out;

    }

    memory_region_transaction_begin();

    pci_default_write_config(d, addr, val, len);

    /* adjust the read and write value to appropriate CFC-CFF window */

    read_val <<= (addr & 3) << 3;

    val <<= (addr & 3) << 3;

    emul_len = len;

    /* loop around the guest requested size */

    while (emul_len > 0) {

        /* find register entry to be emulated */

        reg_entry = xen_pt_find_reg(reg_grp_entry, find_addr);

        if (reg_entry) {

            reg = reg_entry->reg;

            uint32_t real_offset = reg_grp_entry->base_offset + reg->offset;

            uint32_t valid_mask = 0xFFFFFFFF >> ((4 - emul_len) << 3);

            uint8_t *ptr_val = NULL;

            valid_mask <<= (find_addr - real_offset) << 3;

            ptr_val = (uint8_t *)&val + (real_offset & 3);

            /* do emulation based on register size */

            switch (reg->size) {

            case 1:

                if (reg->u.b.write) {

                    rc = reg->u.b.write(s, reg_entry, ptr_val,

                                        read_val >> ((real_offset & 3) << 3),

                                        valid_mask);

                }

                break;

            case 2:

                if (reg->u.w.write) {

                    rc = reg->u.w.write(s, reg_entry, (uint16_t *)ptr_val,

                                        (read_val >> ((real_offset & 3) << 3)),

                                        valid_mask);

                }

                break;

            case 4:

                if (reg->u.dw.write) {

                    rc = reg->u.dw.write(s, reg_entry, (uint32_t *)ptr_val,

                                         (read_val >> ((real_offset & 3) << 3)),

                                         valid_mask);

                }

                break;

            }

            if (rc < 0) {

                xen_shutdown_fatal_error("Internal error: Invalid write"

                                         " emulation. (%s, rc: %d)\n",

                                         __func__, rc);

                return;

            }

            /* calculate next address to find */

            emul_len -= reg->size;

            if (emul_len > 0) {

                find_addr = real_offset + reg->size;

            }

        } else {

            /* nothing to do with passthrough type register,

             * continue to find next byte */

            emul_len--;

            find_addr++;

        }

    }

    /* need to shift back before passing them to xen_host_pci_device */

    val >>= (addr & 3) << 3;

    memory_region_transaction_commit();

out:

    if (!(reg && reg->no_wb)) {

        /* unknown regs are passed through */

        rc = xen_host_pci_set_block(&s->real_device, addr,

                                    (uint8_t *)&val, len);

        if (rc < 0) {

            XEN_PT_ERR(d, "pci_write_block failed. return value: %d.\n", rc);

        }

    }

}

/* register regions */

static uint64_t xen_pt_bar_read(void *o, target_phys_addr_t addr,

                                unsigned size)

{

    PCIDevice *d = o;

    /* if this function is called, that probably means that there is a

     * misconfiguration of the IOMMU. */

    XEN_PT_ERR(d, "Should not read BAR through QEMU. @0x"TARGET_FMT_plx"\n",

               addr);

    return 0;

}

static void xen_pt_bar_write(void *o, target_phys_addr_t addr, uint64_t val,

                             unsigned size)

{

    PCIDevice *d = o;

    /* Same comment as xen_pt_bar_read function */

    XEN_PT_ERR(d, "Should not write BAR through QEMU. @0x"TARGET_FMT_plx"\n",

               addr);

}

static const MemoryRegionOps ops = {

    .endianness = DEVICE_NATIVE_ENDIAN,

    .read = xen_pt_bar_read,

    .write = xen_pt_bar_write,

};

static int xen_pt_register_regions(XenPCIPassthroughState *s)

{

    int i = 0;

    XenHostPCIDevice *d = &s->real_device;

    /* Register PIO/MMIO BARs */

    for (i = 0; i < PCI_ROM_SLOT; i++) {

        XenHostPCIIORegion *r = &d->io_regions[i];

        uint8_t type;

        if (r->base_addr == 0 || r->size == 0) {

            continue;

        }

        s->bases[i].access.u = r->base_addr;

        if (r->type & XEN_HOST_PCI_REGION_TYPE_IO) {

            type = PCI_BASE_ADDRESS_SPACE_IO;

        } else {

            type = PCI_BASE_ADDRESS_SPACE_MEMORY;

            if (r->type & XEN_HOST_PCI_REGION_TYPE_PREFETCH) {

                type |= PCI_BASE_ADDRESS_MEM_PREFETCH;

            }

        }

        memory_region_init_io(&s->bar[i], &ops, &s->dev,

                              "xen-pci-pt-bar", r->size);

        pci_register_bar(&s->dev, i, type, &s->bar[i]);

        XEN_PT_LOG(&s->dev, "IO region %i registered (size=0x%08"PRIx64

                   " base_addr=0x%08"PRIx64" type: %#x)\n",

                   i, r->size, r->base_addr, type);

    }

    /* Register expansion ROM address */

    if (d->rom.base_addr && d->rom.size) {

        uint32_t bar_data = 0;

        /* Re-set BAR reported by OS, otherwise ROM can't be read. */

        if (xen_host_pci_get_long(d, PCI_ROM_ADDRESS, &bar_data)) {

            return 0;

        }

        if ((bar_data & PCI_ROM_ADDRESS_MASK) == 0) {

            bar_data |= d->rom.base_addr & PCI_ROM_ADDRESS_MASK;

            xen_host_pci_set_long(d, PCI_ROM_ADDRESS, bar_data);

        }

        s->bases[PCI_ROM_SLOT].access.maddr = d->rom.base_addr;

        memory_region_init_rom_device(&s->rom, NULL, NULL,

                                      "xen-pci-pt-rom", d->rom.size);

        pci_register_bar(&s->dev, PCI_ROM_SLOT, PCI_BASE_ADDRESS_MEM_PREFETCH,

                         &s->rom);

        XEN_PT_LOG(&s->dev, "Expansion ROM registered (size=0x%08"PRIx64

                   " base_addr=0x%08"PRIx64")\n",

                   d->rom.size, d->rom.base_addr);

    }

    return 0;

}

static void xen_pt_unregister_regions(XenPCIPassthroughState *s)

{

    XenHostPCIDevice *d = &s->real_device;

    int i;

    for (i = 0; i < PCI_NUM_REGIONS - 1; i++) {

        XenHostPCIIORegion *r = &d->io_regions[i];

        if (r->base_addr == 0 || r->size == 0) {

            continue;

        }

        memory_region_destroy(&s->bar[i]);

    }

    if (d->rom.base_addr && d->rom.size) {

        memory_region_destroy(&s->rom);

    }

}

/* region mapping */

static int xen_pt_bar_from_region(XenPCIPassthroughState *s, MemoryRegion *mr)

{

    int i = 0;

    for (i = 0; i < PCI_NUM_REGIONS - 1; i++) {

        if (mr == &s->bar[i]) {

            return i;

        }

    }

    if (mr == &s->rom) {

        return PCI_ROM_SLOT;

    }

    return -1;

}

/*

 * This function checks if an io_region overlaps an io_region from another

 * device.  The io_region to check is provided with (addr, size and type)

 * A callback can be provided and will be called for every region that is

 * overlapped.

 * The return value indicates if the region is overlappsed */

struct CheckBarArgs {

    XenPCIPassthroughState *s;

    pcibus_t addr;

    pcibus_t size;

    uint8_t type;

    bool rc;

};

static void xen_pt_check_bar_overlap(PCIBus *bus, PCIDevice *d, void *opaque)

{

    struct CheckBarArgs *arg = opaque;

    XenPCIPassthroughState *s = arg->s;

    uint8_t type = arg->type;

    int i;

    if (d->devfn == s->dev.devfn) {

        return;

    }

    /* xxx: This ignores bridges. */

    for (i = 0; i < PCI_NUM_REGIONS; i++) {

        const PCIIORegion *r = &d->io_regions[i];

        if (!r->size) {

            continue;

        }

        if ((type & PCI_BASE_ADDRESS_SPACE_IO)

            != (r->type & PCI_BASE_ADDRESS_SPACE_IO)) {

            continue;

        }

        if (ranges_overlap(arg->addr, arg->size, r->addr, r->size)) {

            XEN_PT_WARN(&s->dev,

                        "Overlapped to device [%02x:%02x.%d] Region: %i"

                        " (addr: %#"FMT_PCIBUS", len: %#"FMT_PCIBUS")\n",

                        pci_bus_num(bus), PCI_SLOT(d->devfn),

                        PCI_FUNC(d->devfn), i, r->addr, r->size);

            arg->rc = true;

        }

    }

}

static void xen_pt_region_update(XenPCIPassthroughState *s,

                                 MemoryRegionSection *sec, bool adding)

{

    PCIDevice *d = &s->dev;

    MemoryRegion *mr = sec->mr;

    int bar = -1;

    int rc;

    int op = adding ? DPCI_ADD_MAPPING : DPCI_REMOVE_MAPPING;

    struct CheckBarArgs args = {

        .s = s,

        .addr = sec->offset_within_address_space,

        .size = sec->size,

        .rc = false,

    };

    bar = xen_pt_bar_from_region(s, mr);

    if (bar == -1 && (!s->msix || &s->msix->mmio != mr)) {

        return;

    }

    if (s->msix && &s->msix->mmio == mr) {

        if (adding) {

            s->msix->mmio_base_addr = sec->offset_within_address_space;

            rc = xen_pt_msix_update_remap(s, s->msix->bar_index);

        }

        return;

    }

    args.type = d->io_regions[bar].type;

    pci_for_each_device(d->bus, pci_bus_num(d->bus),

                        xen_pt_check_bar_overlap, &args);

    if (args.rc) {

        XEN_PT_WARN(d, "Region: %d (addr: %#"FMT_PCIBUS

                    ", len: %#"FMT_PCIBUS") is overlapped.\n",

                    bar, sec->offset_within_address_space, sec->size);

    }

    if (d->io_regions[bar].type & PCI_BASE_ADDRESS_SPACE_IO) {

        uint32_t guest_port = sec->offset_within_address_space;

        uint32_t machine_port = s->bases[bar].access.pio_base;

        uint32_t size = sec->size;

        rc = xc_domain_ioport_mapping(xen_xc, xen_domid,

                                      guest_port, machine_port, size,

                                      op);

        if (rc) {

            XEN_PT_ERR(d, "%s ioport mapping failed! (rc: %i)\n",

                       adding ? "create new" : "remove old", rc);

        }

    } else {

        pcibus_t guest_addr = sec->offset_within_address_space;

        pcibus_t machine_addr = s->bases[bar].access.maddr

            + sec->offset_within_region;

        pcibus_t size = sec->size;

        rc = xc_domain_memory_mapping(xen_xc, xen_domid,

                                      XEN_PFN(guest_addr + XC_PAGE_SIZE - 1),

                                      XEN_PFN(machine_addr + XC_PAGE_SIZE - 1),

                                      XEN_PFN(size + XC_PAGE_SIZE - 1),

                                      op);

        if (rc) {

            XEN_PT_ERR(d, "%s mem mapping failed! (rc: %i)\n",

                       adding ? "create new" : "remove old", rc);

        }

    }

}

static void xen_pt_begin(MemoryListener *l)

{

}

static void xen_pt_commit(MemoryListener *l)

{

}

static void xen_pt_region_add(MemoryListener *l, MemoryRegionSection *sec)

{

    XenPCIPassthroughState *s = container_of(l, XenPCIPassthroughState,

                                             memory_listener);

    xen_pt_region_update(s, sec, true);

}

static void xen_pt_region_del(MemoryListener *l, MemoryRegionSection *sec)

{

    XenPCIPassthroughState *s = container_of(l, XenPCIPassthroughState,

                                             memory_listener);

    xen_pt_region_update(s, sec, false);

}

static void xen_pt_region_nop(MemoryListener *l, MemoryRegionSection *s)

{

}

static void xen_pt_log_fns(MemoryListener *l, MemoryRegionSection *s)

{

}

static void xen_pt_log_global_fns(MemoryListener *l)

{

}

static void xen_pt_eventfd_fns(MemoryListener *l, MemoryRegionSection *s,

                               bool match_data, uint64_t data, EventNotifier *n)

{

}

static const MemoryListener xen_pt_memory_listener = {

    .begin = xen_pt_begin,

    .commit = xen_pt_commit,

    .region_add = xen_pt_region_add,

    .region_nop = xen_pt_region_nop,

    .region_del = xen_pt_region_del,

    .log_start = xen_pt_log_fns,

    .log_stop = xen_pt_log_fns,

    .log_sync = xen_pt_log_fns,

    .log_global_start = xen_pt_log_global_fns,

    .log_global_stop = xen_pt_log_global_fns,

    .eventfd_add = xen_pt_eventfd_fns,

    .eventfd_del = xen_pt_eventfd_fns,

    .priority = 10,

};

/* init */

static int xen_pt_initfn(PCIDevice *d)

{

    XenPCIPassthroughState *s = DO_UPCAST(XenPCIPassthroughState, dev, d);

    int rc = 0;

    uint8_t machine_irq = 0;

    int pirq = XEN_PT_UNASSIGNED_PIRQ;

    /* register real device */

    XEN_PT_LOG(d, "Assigning real physical device %02x:%02x.%d"

               " to devfn %#x\n",

               s->hostaddr.bus, s->hostaddr.slot, s->hostaddr.function,

               s->dev.devfn);

    rc = xen_host_pci_device_get(&s->real_device,

                                 s->hostaddr.domain, s->hostaddr.bus,

                                 s->hostaddr.slot, s->hostaddr.function);

    if (rc) {

        XEN_PT_ERR(d, "Failed to \"open\" the real pci device. rc: %i\n", rc);

        return -1;

    }

    s->is_virtfn = s->real_device.is_virtfn;

    if (s->is_virtfn) {

        XEN_PT_LOG(d, "%04x:%02x:%02x.%d is a SR-IOV Virtual Function\n",

                   s->real_device.domain, bus, slot, func);

    }

    /* Initialize virtualized PCI configuration (Extended 256 Bytes) */

    if (xen_host_pci_get_block(&s->real_device, 0, d->config,

                               PCI_CONFIG_SPACE_SIZE) == -1) {

        xen_host_pci_device_put(&s->real_device);

        return -1;

    }

    s->memory_listener = xen_pt_memory_listener;

    /* Handle real device's MMIO/PIO BARs */

    xen_pt_register_regions(s);

    /* reinitialize each config register to be emulated */

    if (xen_pt_config_init(s)) {

        XEN_PT_ERR(d, "PCI Config space initialisation failed.\n");

        xen_host_pci_device_put(&s->real_device);

        return -1;

    }

    /* Bind interrupt */

    if (!s->dev.config[PCI_INTERRUPT_PIN]) {

        XEN_PT_LOG(d, "no pin interrupt\n");

        goto out;

    }

    machine_irq = s->real_device.irq;

    rc = xc_physdev_map_pirq(xen_xc, xen_domid, machine_irq, &pirq);

    if (rc < 0) {

        XEN_PT_ERR(d, "Mapping machine irq %u to pirq %i failed, (rc: %d)\n",

                   machine_irq, pirq, rc);

        /* Disable PCI intx assertion (turn on bit10 of devctl) */

        xen_host_pci_set_word(&s->real_device,

                              PCI_COMMAND,

                              pci_get_word(s->dev.config + PCI_COMMAND)

                              | PCI_COMMAND_INTX_DISABLE);

        machine_irq = 0;

        s->machine_irq = 0;

    } else {

        machine_irq = pirq;

        s->machine_irq = pirq;

        xen_pt_mapped_machine_irq[machine_irq]++;

    }

    /* bind machine_irq to device */

    if (machine_irq != 0) {

        uint8_t e_intx = xen_pt_pci_intx(s);

        rc = xc_domain_bind_pt_pci_irq(xen_xc, xen_domid, machine_irq,

                                       pci_bus_num(d->bus),

                                       PCI_SLOT(d->devfn),

                                       e_intx);

        if (rc < 0) {

            XEN_PT_ERR(d, "Binding of interrupt %i failed! (rc: %d)\n",

                       e_intx, rc);

            /* Disable PCI intx assertion (turn on bit10 of devctl) */

            xen_host_pci_set_word(&s->real_device, PCI_COMMAND,

                                  *(uint16_t *)(&s->dev.config[PCI_COMMAND])

                                  | PCI_COMMAND_INTX_DISABLE);

            xen_pt_mapped_machine_irq[machine_irq]--;

            if (xen_pt_mapped_machine_irq[machine_irq] == 0) {

                if (xc_physdev_unmap_pirq(xen_xc, xen_domid, machine_irq)) {

                    XEN_PT_ERR(d, "Unmapping of machine interrupt %i failed!"

                               " (rc: %d)\n", machine_irq, rc);

                }

            }

            s->machine_irq = 0;

        }

    }

out:

    memory_listener_register(&s->memory_listener, NULL);

    XEN_PT_LOG(d, "Real physical device %02x:%02x.%d registered successfuly!\n",

               bus, slot, func);

    return 0;

}

static int xen_pt_unregister_device(PCIDevice *d)

{

    XenPCIPassthroughState *s = DO_UPCAST(XenPCIPassthroughState, dev, d);

    uint8_t machine_irq = s->machine_irq;

    uint8_t intx = xen_pt_pci_intx(s);

    int rc;

    if (machine_irq) {

        rc = xc_domain_unbind_pt_irq(xen_xc, xen_domid, machine_irq,

                                     PT_IRQ_TYPE_PCI,

                                     pci_bus_num(d->bus),

                                     PCI_SLOT(s->dev.devfn),

                                     intx,

                                     0 /* isa_irq */);

        if (rc < 0) {

            XEN_PT_ERR(d, "unbinding of interrupt INT%c failed."

                       " (machine irq: %i, rc: %d)"

                       " But bravely continuing on..\n",

                       'a' + intx, machine_irq, rc);

        }

    }

    if (s->msi) {

        xen_pt_msi_disable(s);

    }

    if (s->msix) {

        xen_pt_msix_disable(s);

    }

    if (machine_irq) {

        xen_pt_mapped_machine_irq[machine_irq]--;

        if (xen_pt_mapped_machine_irq[machine_irq] == 0) {

            rc = xc_physdev_unmap_pirq(xen_xc, xen_domid, machine_irq);

            if (rc < 0) {

                XEN_PT_ERR(d, "unmapping of interrupt %i failed. (rc: %d)"

                           " But bravely continuing on..\n",

                           machine_irq, rc);

            }

        }

    }

    /* delete all emulated config registers */

    xen_pt_config_delete(s);

    xen_pt_unregister_regions(s);

    memory_listener_unregister(&s->memory_listener);

    xen_host_pci_device_put(&s->real_device);

    return 0;

}

static Property xen_pci_passthrough_properties[] = {

    DEFINE_PROP_PCI_HOST_DEVADDR("hostaddr", XenPCIPassthroughState, hostaddr),

    DEFINE_PROP_END_OF_LIST(),

};

static void xen_pci_passthrough_class_init(ObjectClass *klass, void *data)

{

    DeviceClass *dc = DEVICE_CLASS(klass);

    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);

    k->init = xen_pt_initfn;

    k->exit = xen_pt_unregister_device;

    k->config_read = xen_pt_pci_read_config;

    k->config_write = xen_pt_pci_write_config;

    dc->desc = "Assign an host PCI device with Xen";

    dc->props = xen_pci_passthrough_properties;

};

static TypeInfo xen_pci_passthrough_info = {

    .name = "xen-pci-passthrough",

    .parent = TYPE_PCI_DEVICE,

    .instance_size = sizeof(XenPCIPassthroughState),

    .class_init = xen_pci_passthrough_class_init,

};

static void xen_pci_passthrough_register_types(void)

{

    type_register_static(&xen_pci_passthrough_info);

}

type_init(xen_pci_passthrough_register_types)