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[Xen-devel] [PATCH V3 07/10] Introduce Xen PCI Passthrough, qdevice (1/3)



From: Allen Kay <allen.m.kay@xxxxxxxxx>

Signed-off-by: Allen Kay <allen.m.kay@xxxxxxxxx>
Signed-off-by: Guy Zana <guy@xxxxxxxxxxxx>
Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
 Makefile.target                  |    2 +
 hw/xen_pci_passthrough.c         |  838 ++++++++++++++++++++++++++++++++++++++
 hw/xen_pci_passthrough.h         |  223 ++++++++++
 hw/xen_pci_passthrough_helpers.c |   46 ++
 4 files changed, 1109 insertions(+), 0 deletions(-)
 create mode 100644 hw/xen_pci_passthrough.c
 create mode 100644 hw/xen_pci_passthrough.h
 create mode 100644 hw/xen_pci_passthrough_helpers.c

diff --git a/Makefile.target b/Makefile.target
index 243f9f2..36ea47d 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -217,6 +217,8 @@ obj-i386-$(CONFIG_XEN) += xen_platform.o
 
 # Xen PCI Passthrough
 obj-i386-$(CONFIG_XEN_PCI_PASSTHROUGH) += host-pci-device.o
+obj-i386-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen_pci_passthrough.o
+obj-i386-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen_pci_passthrough_helpers.o
 
 # Inter-VM PCI shared memory
 CONFIG_IVSHMEM =
diff --git a/hw/xen_pci_passthrough.c b/hw/xen_pci_passthrough.c
new file mode 100644
index 0000000..b97c5b6
--- /dev/null
+++ b/hw/xen_pci_passthrough.c
@@ -0,0 +1,838 @@
+/*
+ * 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@xxxxxxxxxxxx>
+ * Allen Kay <allen.m.kay@xxxxxxxxx>
+ * Guy Zana <guy@xxxxxxxxxxxx>
+ *
+ * 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 mapped_machine_irq[machine_irq]
+ *         - Set assigned_device->machine_irq to '0'.
+ *
+ *   Write to Interrupt Disable bit by guest software(pt_cmd_reg_write)
+ *     Write '0'
+ *       <ptdev->msi_trans_en is false>
+ *         - Set real bit to '0' if assigned_device->machine_irq isn't '0'.
+ *
+ *     Write '1'
+ *       <ptdev->msi_trans_en is false>
+ *         - Set real bit to '1'.
+ *
+ * MSI-INTx translation.
+ *   Initialize(xc_physdev_map_pirq_msi/pt_msi_setup)
+ *     Bind MSI-INTx(xc_domain_bind_pt_irq)
+ *       <fail>
+ *         - Unmap MSI.
+ *           <success>
+ *             - Set dev->msi->pirq to '-1'.
+ *           <fail>
+ *             - Do nothing.
+ *
+ *   Write to Interrupt Disable bit by guest software(pt_cmd_reg_write)
+ *     Write '0'
+ *       <ptdev->msi_trans_en is true>
+ *         - Set MSI Enable bit to '1'.
+ *
+ *     Write '1'
+ *       <ptdev->msi_trans_en is true>
+ *         - Set MSI Enable bit to '0'.
+ *
+ * MSI interrupt:
+ *   Initialize MSI register(pt_msi_setup, 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(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_pci_passthrough.h"
+
+#define PCI_BAR_ENTRIES (6)
+
+#define PT_NR_IRQS          (256)
+char mapped_machine_irq[PT_NR_IRQS] = {0};
+
+/* Config Space */
+static int pt_pci_config_access_check(PCIDevice *d, uint32_t address, int len)
+{
+    /* check offset range */
+    if (address >= 0xFF) {
+        PT_LOG("Error: Failed to access register with offset exceeding FFh. "
+               "[%02x:%02x.%x][Offset:%02xh][Length:%d]\n",
+               pci_bus_num(d->bus), PCI_SLOT(d->devfn), PCI_FUNC(d->devfn),
+               address, len);
+        return -1;
+    }
+
+    /* check read size */
+    if ((len != 1) && (len != 2) && (len != 4)) {
+        PT_LOG("Error: Failed to access register with invalid access length. "
+               "[%02x:%02x.%x][Offset:%02xh][Length:%d]\n",
+               pci_bus_num(d->bus), PCI_SLOT(d->devfn), PCI_FUNC(d->devfn),
+               address, len);
+        return -1;
+    }
+
+    /* check offset alignment */
+    if (address & (len - 1)) {
+        PT_LOG("Error: Failed to access register with invalid access size "
+            "alignment. [%02x:%02x.%x][Offset:%02xh][Length:%d]\n",
+            pci_bus_num(d->bus), PCI_SLOT(d->devfn), PCI_FUNC(d->devfn),
+            address, len);
+        return -1;
+    }
+
+    return 0;
+}
+
+int 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 pt_pci_read_config(PCIDevice *d, uint32_t address, 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 = address;
+
+    if (pt_pci_config_access_check(d, address, len)) {
+        goto exit;
+    }
+
+    /* check power state transition flags */
+    if (s->pm_state != NULL && s->pm_state->flags & PT_FLAG_TRANSITING) {
+        /* can't accept until previous power state transition is completed.
+         * so finished previous request here.
+         */
+        PT_LOG("Warning: guest want to write durring power state 
transition\n");
+        goto exit;
+    }
+
+    /* find register group entry */
+    reg_grp_entry = pt_find_reg_grp(s, address);
+    if (reg_grp_entry) {
+        /* check 0 Hardwired register group */
+        if (reg_grp_entry->reg_grp->grp_type == GRP_TYPE_HARDWIRED) {
+            /* no need to emulate, just return 0 */
+            val = 0;
+            goto exit;
+        }
+    }
+
+    /* read I/O device register value */
+    rc = host_pci_get_block(s->real_device, address, (uint8_t *)&val, len);
+    if (!rc) {
+        PT_LOG("Error: 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 <<= (address & 3) << 3;
+    emul_len = len;
+
+    /* loop Guest request size */
+    while (emul_len > 0) {
+        /* find register entry to be emulated */
+        reg_entry = 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 depend 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) {
+                hw_error("Internal error: Invalid read emulation "
+                         "return value[%d]. I/O emulator exit.\n", rc);
+            }
+
+            /* 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 >>= ((address & 3) << 3);
+
+exit:
+    PT_LOG_CONFIG("[%02x:%02x.%x]: address=%04x val=0x%08x len=%d\n",
+                  pci_bus_num(d->bus), PCI_SLOT(d->devfn), PCI_FUNC(d->devfn),
+                  address, val, len);
+    return val;
+}
+
+static void pt_pci_write_config(PCIDevice *d, uint32_t address,
+                                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 = address;
+    XenPTRegInfo *reg = NULL;
+
+    if (pt_pci_config_access_check(d, address, len)) {
+        return;
+    }
+
+    PT_LOG_CONFIG("[%02x:%02x.%x]: address=%04x val=0x%08x len=%d\n",
+                  pci_bus_num(d->bus), PCI_SLOT(d->devfn), PCI_FUNC(d->devfn),
+                  address, val, len);
+
+    /* check unused BAR register */
+    index = pt_bar_offset_to_index(address);
+    if ((index >= 0) && (val > 0 && val < PT_BAR_ALLF) &&
+        (s->bases[index].bar_flag == PT_BAR_FLAG_UNUSED)) {
+        PT_LOG("Warning: Guest attempt to set address to unused Base Address "
+               "Register. [%02x:%02x.%x][Offset:%02xh][Length:%d]\n",
+               pci_bus_num(d->bus), PCI_SLOT(d->devfn), PCI_FUNC(d->devfn),
+               address, len);
+    }
+
+    /* check power state transition flags */
+    if (s->pm_state != NULL && s->pm_state->flags & PT_FLAG_TRANSITING) {
+        /* can't accept untill previous power state transition is completed.
+         * so finished previous request here.
+         */
+        PT_LOG("Warning: guest want to write durring power state 
transition\n");
+        return;
+    }
+
+    /* find register group entry */
+    reg_grp_entry = pt_find_reg_grp(s, address);
+    if (reg_grp_entry) {
+        /* check 0 Hardwired register group */
+        if (reg_grp_entry->reg_grp->grp_type == GRP_TYPE_HARDWIRED) {
+            /* ignore silently */
+            PT_LOG("Warning: Access to 0 Hardwired register. "
+                   "[%02x:%02x.%x][Offset:%02xh][Length:%d]\n",
+                   pci_bus_num(d->bus), PCI_SLOT(d->devfn), PCI_FUNC(d->devfn),
+                   address, len);
+            return;
+        }
+    }
+
+    /* read I/O device register value */
+    rc = host_pci_get_block(s->real_device, address,
+                             (uint8_t *)&read_val, len);
+    if (!rc) {
+        PT_LOG("Error: pci_read_block failed. return value[%d].\n", rc);
+        memset(&read_val, 0xff, len);
+    }
+
+    /* pass directly to libpci for passthrough type register group */
+    if (reg_grp_entry == NULL) {
+        goto out;
+    }
+
+    /* adjust the read and write value to appropriate CFC-CFF window */
+    read_val <<= (address & 3) << 3;
+    val <<= (address & 3) << 3;
+    emul_len = len;
+
+    /* loop Guest request size */
+    while (emul_len > 0) {
+        /* find register entry to be emulated */
+        reg_entry = 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 depend 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) {
+                hw_error("Internal error: Invalid write emulation "
+                         "return value[%d]. I/O emulator exit.\n", rc);
+            }
+
+            /* 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 libpci */
+    val >>= (address & 3) << 3;
+
+out:
+    if (!(reg && reg->no_wb)) {
+        /* unknown regs are passed through */
+        rc = host_pci_set_block(s->real_device, address, (uint8_t *)&val, len);
+
+        if (!rc) {
+            PT_LOG("Error: pci_write_block failed. return value[%d].\n", rc);
+        }
+    }
+
+    if (s->pm_state != NULL && s->pm_state->flags & PT_FLAG_TRANSITING) {
+        qemu_mod_timer(s->pm_state->pm_timer,
+                       qemu_get_clock_ms(rt_clock) + s->pm_state->pm_delay);
+    }
+}
+
+/* ioport/iomem space*/
+static void pt_iomem_map(XenPCIPassthroughState *s, int i,
+                         pcibus_t e_phys, pcibus_t e_size, int type)
+{
+    uint32_t old_ebase = s->bases[i].e_physbase;
+    bool first_map = s->bases[i].e_size == 0;
+    int ret = 0;
+
+    s->bases[i].e_physbase = e_phys;
+    s->bases[i].e_size = e_size;
+
+    PT_LOG("e_phys=%#"PRIx64" maddr=%#"PRIx64" type=%%d"
+           " len=%#"PRIx64" index=%d first_map=%d\n",
+           e_phys, s->bases[i].access.maddr, /*type,*/
+           e_size, i, first_map);
+
+    if (e_size == 0) {
+        return;
+    }
+
+    if (!first_map && old_ebase != -1) {
+        /* Remove old mapping */
+        ret = xc_domain_memory_mapping(xen_xc, xen_domid,
+                               old_ebase >> XC_PAGE_SHIFT,
+                               s->bases[i].access.maddr >> XC_PAGE_SHIFT,
+                               (e_size + XC_PAGE_SIZE - 1) >> XC_PAGE_SHIFT,
+                               DPCI_REMOVE_MAPPING);
+        if (ret != 0) {
+            PT_LOG("Error: remove old mapping failed!\n");
+            return;
+        }
+    }
+
+    /* map only valid guest address */
+    if (e_phys != -1) {
+        /* Create new mapping */
+        ret = xc_domain_memory_mapping(xen_xc, xen_domid,
+                                   s->bases[i].e_physbase >> XC_PAGE_SHIFT,
+                                   s->bases[i].access.maddr >> XC_PAGE_SHIFT,
+                                   (e_size+XC_PAGE_SIZE-1) >> XC_PAGE_SHIFT,
+                                   DPCI_ADD_MAPPING);
+
+        if (ret != 0) {
+            PT_LOG("Error: create new mapping failed!\n");
+        }
+    }
+}
+
+static void pt_ioport_map(XenPCIPassthroughState *s, int i,
+                          pcibus_t e_phys, pcibus_t e_size, int type)
+{
+    uint32_t old_ebase = s->bases[i].e_physbase;
+    bool first_map = s->bases[i].e_size == 0;
+    int ret = 0;
+
+    s->bases[i].e_physbase = e_phys;
+    s->bases[i].e_size = e_size;
+
+    PT_LOG("e_phys=%#04"PRIx64" pio_base=%#04"PRIx64" len=%"PRId64" index=%d"
+           " first_map=%d\n",
+           e_phys, s->bases[i].access.pio_base, e_size, i, first_map);
+
+    if (e_size == 0) {
+        return;
+    }
+
+    if (!first_map && old_ebase != -1) {
+        /* Remove old mapping */
+        ret = xc_domain_ioport_mapping(xen_xc, xen_domid, old_ebase,
+                                       s->bases[i].access.pio_base, e_size,
+                                       DPCI_REMOVE_MAPPING);
+        if (ret != 0) {
+            PT_LOG("Error: remove old mapping failed!\n");
+            return;
+        }
+    }
+
+    /* map only valid guest address (include 0) */
+    if (e_phys != -1) {
+        /* Create new mapping */
+        ret = xc_domain_ioport_mapping(xen_xc, xen_domid, e_phys,
+                                       s->bases[i].access.pio_base, e_size,
+                                       DPCI_ADD_MAPPING);
+        if (ret != 0) {
+            PT_LOG("Error: create new mapping failed!\n");
+        }
+    }
+
+}
+
+
+/* mapping BAR */
+
+void pt_bar_mapping_one(XenPCIPassthroughState *s, int bar,
+                        int io_enable, int mem_enable)
+{
+    PCIDevice *dev = &s->dev;
+    PCIIORegion *r;
+    XenPTRegGroup *reg_grp_entry = NULL;
+    XenPTReg *reg_entry = NULL;
+    XenPTRegion *base = NULL;
+    pcibus_t r_size = 0, r_addr = -1;
+    int rc = 0;
+
+    r = &dev->io_regions[bar];
+
+    /* check valid region */
+    if (!r->size) {
+        return;
+    }
+
+    base = &s->bases[bar];
+    /* skip unused BAR or upper 64bit BAR */
+    if ((base->bar_flag == PT_BAR_FLAG_UNUSED)
+        || (base->bar_flag == PT_BAR_FLAG_UPPER)) {
+           return;
+    }
+
+    /* copy region address to temporary */
+    r_addr = r->addr;
+
+    /* need unmapping in case I/O Space or Memory Space disable */
+    if (((base->bar_flag == PT_BAR_FLAG_IO) && !io_enable) ||
+        ((base->bar_flag == PT_BAR_FLAG_MEM) && !mem_enable)) {
+        r_addr = -1;
+    }
+    if ((bar == PCI_ROM_SLOT) && (r_addr != -1)) {
+        reg_grp_entry = pt_find_reg_grp(s, PCI_ROM_ADDRESS);
+        if (reg_grp_entry) {
+            reg_entry = pt_find_reg(reg_grp_entry, PCI_ROM_ADDRESS);
+            if (reg_entry && !(reg_entry->data & PCI_ROM_ADDRESS_ENABLE)) {
+                r_addr = -1;
+            }
+        }
+    }
+
+    /* prevent guest software mapping memory resource to 00000000h */
+    if ((base->bar_flag == PT_BAR_FLAG_MEM) && (r_addr == 0)) {
+        r_addr = -1;
+    }
+
+    r_size = pt_get_emul_size(base->bar_flag, r->size);
+
+    rc = pci_check_bar_overlap(dev, r_addr, r_size, r->type);
+    if (rc > 0) {
+        PT_LOG("Warning: s[%02x:%02x.%x][Region:%d][Address:%"FMT_PCIBUS"h]"
+               "[Size:%"FMT_PCIBUS"h] is overlapped.\n", pci_bus_num(dev->bus),
+               PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), bar,
+               r_addr, r_size);
+    }
+
+    /* check whether we need to update the mapping or not */
+    if (r_addr != s->bases[bar].e_physbase) {
+        /* mapping BAR */
+        if (base->bar_flag == PT_BAR_FLAG_IO) {
+            pt_ioport_map(s, bar, r_addr, r_size, r->type);
+        } else {
+            pt_iomem_map(s, bar, r_addr, r_size, r->type);
+        }
+    }
+}
+
+void pt_bar_mapping(XenPCIPassthroughState *s, int io_enable, int mem_enable)
+{
+    int i;
+
+    for (i = 0; i < PCI_NUM_REGIONS; i++) {
+        pt_bar_mapping_one(s, i, io_enable, mem_enable);
+    }
+}
+
+/* register regions */
+static int pt_register_regions(XenPCIPassthroughState *s)
+{
+    int i = 0;
+    uint32_t bar_data = 0;
+    HostPCIDevice *d = s->real_device;
+
+    /* Register PIO/MMIO BARs */
+    for (i = 0; i < PCI_BAR_ENTRIES; i++) {
+        HostPCIIORegion *r = &d->io_regions[i];
+
+        if (r->base_addr) {
+            s->bases[i].e_physbase = r->base_addr;
+            s->bases[i].access.u = r->base_addr;
+
+            /* Register current region */
+            if (r->flags & IORESOURCE_IO) {
+                memory_region_init_io(&s->bar[i], NULL, NULL,
+                                      "xen-pci-pt-bar", r->size);
+                pci_register_bar(&s->dev, i, PCI_BASE_ADDRESS_SPACE_IO,
+                                 &s->bar[i]);
+            } else if (r->flags & IORESOURCE_PREFETCH) {
+                memory_region_init_io(&s->bar[i], NULL, NULL,
+                                      "xen-pci-pt-bar", r->size);
+                pci_register_bar(&s->dev, i, PCI_BASE_ADDRESS_MEM_PREFETCH,
+                                 &s->bar[i]);
+            } else {
+                memory_region_init_io(&s->bar[i], NULL, NULL,
+                                      "xen-pci-pt-bar", r->size);
+                pci_register_bar(&s->dev, i, PCI_BASE_ADDRESS_SPACE_MEMORY,
+                                 &s->bar[i]);
+            }
+
+            PT_LOG("IO region registered (size=0x%08"PRIx64
+                   " base_addr=0x%08"PRIx64")\n",
+                   r->size, r->base_addr);
+        }
+    }
+
+    /* Register expansion ROM address */
+    if (d->rom.base_addr && d->rom.size) {
+        /* Re-set BAR reported by OS, otherwise ROM can't be read. */
+        bar_data = host_pci_get_long(d, PCI_ROM_ADDRESS);
+        if ((bar_data & PCI_ROM_ADDRESS_MASK) == 0) {
+            bar_data |= d->rom.base_addr & PCI_ROM_ADDRESS_MASK;
+            host_pci_set_long(d, PCI_ROM_ADDRESS, bar_data);
+        }
+
+        s->bases[PCI_ROM_SLOT].e_physbase = d->rom.base_addr;
+        s->bases[PCI_ROM_SLOT].access.maddr = d->rom.base_addr;
+
+        memory_region_init_rom_device(&s->rom, NULL, NULL, &s->dev.qdev,
+                                      "xen-pci-pt-rom", d->rom.size);
+        pci_register_bar(&s->dev, PCI_ROM_SLOT, PCI_BASE_ADDRESS_MEM_PREFETCH,
+                         &s->rom);
+
+        PT_LOG("Expansion ROM registered (size=0x%08"PRIx64
+               " base_addr=0x%08"PRIx64")\n",
+               d->rom.size, d->rom.base_addr);
+    }
+
+    return 0;
+}
+
+static void pt_unregister_regions(XenPCIPassthroughState *s)
+{
+    int i, type, rc;
+    uint32_t e_size;
+    PCIDevice *d = &s->dev;
+
+    for (i = 0; i < PCI_NUM_REGIONS; i++) {
+        e_size = s->bases[i].e_size;
+        if ((e_size == 0) || (s->bases[i].e_physbase == -1)) {
+            continue;
+        }
+
+        type = d->io_regions[i].type;
+
+        if (type == PCI_BASE_ADDRESS_SPACE_MEMORY
+            || type == PCI_BASE_ADDRESS_MEM_PREFETCH) {
+            rc = xc_domain_memory_mapping(xen_xc, xen_domid,
+                    s->bases[i].e_physbase >> XC_PAGE_SHIFT,
+                    s->bases[i].access.maddr >> XC_PAGE_SHIFT,
+                    (e_size+XC_PAGE_SIZE-1) >> XC_PAGE_SHIFT,
+                    DPCI_REMOVE_MAPPING);
+            if (rc != 0) {
+                PT_LOG("Error: remove old mem mapping failed!\n");
+                continue;
+            }
+
+        } else if (type == PCI_BASE_ADDRESS_SPACE_IO) {
+            rc = xc_domain_ioport_mapping(xen_xc, xen_domid,
+                        s->bases[i].e_physbase,
+                        s->bases[i].access.pio_base,
+                        e_size,
+                        DPCI_REMOVE_MAPPING);
+            if (rc != 0) {
+                PT_LOG("Error: remove old io mapping failed!\n");
+                continue;
+            }
+        }
+    }
+}
+
+static int pt_initfn(PCIDevice *pcidev)
+{
+    XenPCIPassthroughState *s = DO_UPCAST(XenPCIPassthroughState, dev, pcidev);
+    int dom, bus;
+    unsigned slot, func;
+    int rc = 0;
+    uint32_t machine_irq;
+    int pirq = -1;
+
+    if (pci_parse_devaddr(s->hostaddr, &dom, &bus, &slot, &func) < 0) {
+        fprintf(stderr, "error parse bdf: %s\n", s->hostaddr);
+        return -1;
+    }
+
+    /* register real device */
+    PT_LOG("Assigning real physical device %02x:%02x.%x to devfn %i ...\n",
+           bus, slot, func, s->dev.devfn);
+
+    s->real_device = host_pci_device_get(bus, slot, func);
+    if (!s->real_device) {
+        return -1;
+    }
+
+    s->is_virtfn = s->real_device->is_virtfn;
+    if (s->is_virtfn) {
+        PT_LOG("%04x:%02x:%02x.%x is a SR-IOV Virtual Function\n",
+               s->real_device->domain, bus, slot, func);
+    }
+
+    /* Initialize virtualized PCI configuration (Extended 256 Bytes) */
+    if (host_pci_get_block(s->real_device, 0, pcidev->config,
+                           PCI_CONFIG_SPACE_SIZE) == -1) {
+        return -1;
+    }
+
+    /* Handle real device's MMIO/PIO BARs */
+    pt_register_regions(s);
+
+    /* reinitialize each config register to be emulated */
+    pt_config_init(s);
+
+    /* Bind interrupt */
+    if (!s->dev.config[PCI_INTERRUPT_PIN]) {
+        PT_LOG("no pin interrupt\n");
+        goto out;
+    }
+
+    machine_irq = host_pci_get_byte(s->real_device, PCI_INTERRUPT_LINE);
+    rc = xc_physdev_map_pirq(xen_xc, xen_domid, machine_irq, &pirq);
+
+    if (rc) {
+        PT_LOG("Error: Mapping irq failed, rc = %d\n", rc);
+
+        /* Disable PCI intx assertion (turn on bit10 of devctl) */
+        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;
+        mapped_machine_irq[machine_irq]++;
+    }
+
+    /* bind machine_irq to device */
+    if (rc < 0 && machine_irq != 0) {
+        uint8_t e_device = PCI_SLOT(s->dev.devfn);
+        uint8_t e_intx = pci_intx(s);
+
+        rc = xc_domain_bind_pt_pci_irq(xen_xc, xen_domid, machine_irq, 0,
+                                       e_device, e_intx);
+        if (rc < 0) {
+            PT_LOG("Error: Binding of interrupt failed! rc=%d\n", rc);
+
+            /* Disable PCI intx assertion (turn on bit10 of devctl) */
+            host_pci_set_word(s->real_device, PCI_COMMAND,
+                              *(uint16_t *)(&s->dev.config[PCI_COMMAND])
+                              | PCI_COMMAND_INTX_DISABLE);
+            mapped_machine_irq[machine_irq]--;
+
+            if (mapped_machine_irq[machine_irq] == 0) {
+                if (xc_physdev_unmap_pirq(xen_xc, xen_domid, machine_irq)) {
+                    PT_LOG("Error: Unmapping of interrupt failed! rc=%d\n",
+                           rc);
+                }
+            }
+            s->machine_irq = 0;
+        }
+    }
+
+out:
+    PT_LOG("Real physical device %02x:%02x.%x registered successfuly!\n"
+           "IRQ type = %s\n", bus, slot, func, "INTx");
+
+    return 0;
+}
+
+static int pt_unregister_device(PCIDevice *pcidev)
+{
+    XenPCIPassthroughState *s = DO_UPCAST(XenPCIPassthroughState, dev, pcidev);
+    uint8_t e_device, e_intx;
+    uint32_t machine_irq;
+    int rc;
+
+    /* Unbind interrupt */
+    e_device = PCI_SLOT(s->dev.devfn);
+    e_intx = pci_intx(s);
+    machine_irq = s->machine_irq;
+
+    if (machine_irq) {
+        rc = xc_domain_unbind_pt_irq(xen_xc, xen_domid, machine_irq,
+                                     PT_IRQ_TYPE_PCI, 0, e_device, e_intx, 0);
+        if (rc < 0) {
+            PT_LOG("Error: Unbinding of interrupt failed! rc=%d\n", rc);
+        }
+    }
+
+    if (machine_irq) {
+        mapped_machine_irq[machine_irq]--;
+
+        if (mapped_machine_irq[machine_irq] == 0) {
+            rc = xc_physdev_unmap_pirq(xen_xc, xen_domid, machine_irq);
+
+            if (rc < 0) {
+                PT_LOG("Error: Unmaping of interrupt failed! rc=%d\n", rc);
+            }
+        }
+    }
+
+    /* delete all emulated config registers */
+    pt_config_delete(s);
+
+    /* unregister real device's MMIO/PIO BARs */
+    pt_unregister_regions(s);
+
+    host_pci_device_put(s->real_device);
+
+    return 0;
+}
+
+static PCIDeviceInfo xen_pci_passthrough = {
+    .init = pt_initfn,
+    .exit = pt_unregister_device,
+    .qdev.name = "xen-pci-passthrough",
+    .qdev.desc = "Assign an host pci device with Xen",
+    .qdev.size = sizeof(XenPCIPassthroughState),
+    .config_read = pt_pci_read_config,
+    .config_write = pt_pci_write_config,
+    .is_express = 0,
+    .qdev.props = (Property[]) {
+        DEFINE_PROP_STRING("hostaddr", XenPCIPassthroughState, hostaddr),
+        DEFINE_PROP_BIT("power-mgmt", XenPCIPassthroughState, power_mgmt,
+                        0, false),
+        DEFINE_PROP_END_OF_LIST(),
+    }
+};
+
+static void xen_passthrough_register(void)
+{
+    pci_qdev_register(&xen_pci_passthrough);
+}
+
+device_init(xen_passthrough_register);
diff --git a/hw/xen_pci_passthrough.h b/hw/xen_pci_passthrough.h
new file mode 100644
index 0000000..2d1979d
--- /dev/null
+++ b/hw/xen_pci_passthrough.h
@@ -0,0 +1,223 @@
+#ifndef QEMU_HW_XEN_PCI_PASSTHROUGH_H
+#  define QEMU_HW_XEN_PCI_PASSTHROUGH_H
+
+#include "qemu-common.h"
+#include "xen_common.h"
+#include "pci.h"
+#include "host-pci-device.h"
+
+#define PT_LOGGING_ENABLED
+#define PT_DEBUG_PCI_CONFIG_ACCESS
+
+#ifdef PT_LOGGING_ENABLED
+#  define PT_LOG(_f, _a...)   fprintf(stderr, "%s: " _f, __func__, ##_a)
+#else
+#  define PT_LOG(_f, _a...)
+#endif
+
+#ifdef PT_DEBUG_PCI_CONFIG_ACCESS
+#  define PT_LOG_CONFIG(_f, _a...) PT_LOG(_f, ##_a)
+#else
+#  define PT_LOG_CONFIG(_f, _a...)
+#endif
+
+
+typedef struct XenPTRegInfo XenPTRegInfo;
+typedef struct XenPTReg XenPTReg;
+
+typedef struct XenPCIPassthroughState XenPCIPassthroughState;
+
+/* function type for config reg */
+typedef uint32_t (*conf_reg_init)
+    (XenPCIPassthroughState *, XenPTRegInfo *, uint32_t real_offset);
+typedef int (*conf_dword_write)
+    (XenPCIPassthroughState *, XenPTReg *cfg_entry,
+     uint32_t *val, uint32_t dev_value, uint32_t valid_mask);
+typedef int (*conf_word_write)
+    (XenPCIPassthroughState *, XenPTReg *cfg_entry,
+     uint16_t *val, uint16_t dev_value, uint16_t valid_mask);
+typedef int (*conf_byte_write)
+    (XenPCIPassthroughState *, XenPTReg *cfg_entry,
+     uint8_t *val, uint8_t dev_value, uint8_t valid_mask);
+typedef int (*conf_dword_read)
+    (XenPCIPassthroughState *, XenPTReg *cfg_entry,
+     uint32_t *val, uint32_t valid_mask);
+typedef int (*conf_word_read)
+    (XenPCIPassthroughState *, XenPTReg *cfg_entry,
+     uint16_t *val, uint16_t valid_mask);
+typedef int (*conf_byte_read)
+    (XenPCIPassthroughState *, XenPTReg *cfg_entry,
+     uint8_t *val, uint8_t valid_mask);
+typedef int (*conf_dword_restore)
+    (XenPCIPassthroughState *, XenPTReg *cfg_entry, uint32_t real_offset,
+     uint32_t dev_value, uint32_t *val);
+typedef int (*conf_word_restore)
+    (XenPCIPassthroughState *, XenPTReg *cfg_entry, uint32_t real_offset,
+     uint16_t dev_value, uint16_t *val);
+typedef int (*conf_byte_restore)
+    (XenPCIPassthroughState *, XenPTReg *cfg_entry, uint32_t real_offset,
+     uint8_t dev_value, uint8_t *val);
+
+/* power state transition */
+#define PT_FLAG_TRANSITING 0x0001
+
+
+typedef enum {
+    GRP_TYPE_HARDWIRED = 0,                     /* 0 Hardwired reg group */
+    GRP_TYPE_EMU,                               /* emul reg group */
+} RegisterGroupType;
+
+typedef enum {
+    PT_BAR_FLAG_MEM = 0,                        /* Memory type BAR */
+    PT_BAR_FLAG_IO,                             /* I/O type BAR */
+    PT_BAR_FLAG_UPPER,                          /* upper 64bit BAR */
+    PT_BAR_FLAG_UNUSED,                         /* unused BAR */
+} PTBarFlag;
+
+
+typedef struct XenPTRegion {
+    /* Virtual phys base & size */
+    uint32_t e_physbase;
+    uint32_t e_size;
+    /* Index of region in qemu */
+    uint32_t memory_index;
+    /* BAR flag */
+    PTBarFlag bar_flag;
+    /* Translation of the emulated address */
+    union {
+        uint64_t maddr;
+        uint64_t pio_base;
+        uint64_t u;
+    } access;
+} XenPTRegion;
+
+/* XenPTRegInfo declaration
+ * - only for emulated register (either a part or whole bit).
+ * - for passthrough register that need special behavior (like interacting with
+ *   other component), set emu_mask to all 0 and specify r/w func properly.
+ * - do NOT use ALL F for init_val, otherwise the tbl will not be registered.
+ */
+
+/* emulated register infomation */
+struct XenPTRegInfo {
+    uint32_t offset;
+    uint32_t size;
+    uint32_t init_val;
+    /* reg read only field mask (ON:RO/ROS, OFF:other) */
+    uint32_t ro_mask;
+    /* reg emulate field mask (ON:emu, OFF:passthrough) */
+    uint32_t emu_mask;
+    /* no write back allowed */
+    uint32_t no_wb;
+    conf_reg_init init;
+    /* read/write/restore function pointer
+     * for double_word/word/byte size */
+    union {
+        struct {
+            conf_dword_write write;
+            conf_dword_read read;
+            conf_dword_restore restore;
+        } dw;
+        struct {
+            conf_word_write write;
+            conf_word_read read;
+            conf_word_restore restore;
+        } w;
+        struct {
+            conf_byte_write write;
+            conf_byte_read read;
+            conf_byte_restore restore;
+        } b;
+    } u;
+};
+
+/* emulated register management */
+struct XenPTReg {
+    QLIST_ENTRY(XenPTReg) entries;
+    XenPTRegInfo *reg;
+    uint32_t data;
+};
+
+typedef struct XenPTRegGroupInfo XenPTRegGroupInfo;
+
+/* emul reg group size initialize method */
+typedef uint8_t (*pt_reg_size_init_fn)
+    (XenPCIPassthroughState *, const XenPTRegGroupInfo *,
+     uint32_t base_offset);
+
+/* emulated register group infomation */
+struct XenPTRegGroupInfo {
+    uint8_t grp_id;
+    RegisterGroupType grp_type;
+    uint8_t grp_size;
+    pt_reg_size_init_fn size_init;
+    XenPTRegInfo *emu_reg_tbl;
+};
+
+/* emul register group management table */
+typedef struct XenPTRegGroup {
+    QLIST_ENTRY(XenPTRegGroup) entries;
+    const XenPTRegGroupInfo *reg_grp;
+    uint32_t base_offset;
+    uint8_t size;
+    QLIST_HEAD(, XenPTReg) reg_tbl_list;
+} XenPTRegGroup;
+
+
+typedef struct XenPTPM {
+    QEMUTimer *pm_timer;  /* QEMUTimer struct */
+    int no_soft_reset;    /* No Soft Reset flags */
+    uint16_t flags;       /* power state transition flags */
+    uint16_t pmc_field;   /* Power Management Capabilities field */
+    int pm_delay;         /* power state transition delay */
+    uint16_t cur_state;   /* current power state */
+    uint16_t req_state;   /* requested power state */
+    uint32_t pm_base;     /* Power Management Capability reg base offset */
+    uint32_t aer_base;    /* AER Capability reg base offset */
+} XenPTPM;
+
+struct XenPCIPassthroughState {
+    PCIDevice dev;
+
+    char *hostaddr;
+    bool is_virtfn;
+    HostPCIDevice *real_device;
+    XenPTRegion bases[PCI_NUM_REGIONS]; /* Access regions */
+    QLIST_HEAD(, XenPTRegGroup) reg_grp_tbl;
+
+    uint32_t machine_irq;
+
+    uint32_t power_mgmt;
+    XenPTPM *pm_state;
+
+    MemoryRegion bar[PCI_NUM_REGIONS - 1];
+    MemoryRegion rom;
+};
+
+void pt_config_init(XenPCIPassthroughState *s);
+void pt_config_delete(XenPCIPassthroughState *s);
+void pt_bar_mapping(XenPCIPassthroughState *s, int io_enable, int mem_enable);
+void pt_bar_mapping_one(XenPCIPassthroughState *s, int bar,
+                        int io_enable, int mem_enable);
+XenPTRegGroup *pt_find_reg_grp(XenPCIPassthroughState *s, uint32_t address);
+XenPTReg *pt_find_reg(XenPTRegGroup *reg_grp, uint32_t address);
+int pt_bar_offset_to_index(uint32_t offset);
+
+static inline pcibus_t pt_get_emul_size(PTBarFlag flag, pcibus_t r_size)
+{
+    /* align resource size (memory type only) */
+    if (flag == PT_BAR_FLAG_MEM) {
+        return (r_size + XC_PAGE_SIZE - 1) & XC_PAGE_MASK;
+    } else {
+        return r_size;
+    }
+}
+
+/* INTx */
+static inline uint8_t pci_read_intx(XenPCIPassthroughState *s)
+{
+    return host_pci_get_byte(s->real_device, PCI_INTERRUPT_PIN);
+}
+uint8_t pci_intx(XenPCIPassthroughState *ptdev);
+
+#endif /* !QEMU_HW_XEN_PCI_PASSTHROUGH_H */
diff --git a/hw/xen_pci_passthrough_helpers.c b/hw/xen_pci_passthrough_helpers.c
new file mode 100644
index 0000000..192e918
--- /dev/null
+++ b/hw/xen_pci_passthrough_helpers.c
@@ -0,0 +1,46 @@
+#include "xen_pci_passthrough.h"
+
+/* The PCI Local Bus Specification, Rev. 3.0, {
+ * Section 6.2.4 Miscellaneous Registers, pp 223
+ * outlines 5 valid values for the intertupt pin (intx).
+ *  0: For devices (or device functions) that don't use an interrupt in
+ *  1: INTA#
+ *  2: INTB#
+ *  3: INTC#
+ *  4: INTD#
+ *
+ * Xen uses the following 4 values for intx
+ *  0: INTA#
+ *  1: INTB#
+ *  2: INTC#
+ *  3: INTD#
+ *
+ * Observing that these list of values are not the same, pci_read_intx()
+ * uses the following mapping from hw to xen values.
+ * This seems to reflect the current usage within Xen.
+ *
+ * PCI hardware    | Xen | Notes
+ * ----------------+-----+----------------------------------------------------
+ * 0               | 0   | No interrupt
+ * 1               | 0   | INTA#
+ * 2               | 1   | INTB#
+ * 3               | 2   | INTC#
+ * 4               | 3   | INTD#
+ * any other value | 0   | This should never happen, log error message
+}
+ */
+uint8_t pci_intx(XenPCIPassthroughState *ptdev)
+{
+    uint8_t r_val = pci_read_intx(ptdev);
+
+    PT_LOG("intx=%i\n", r_val);
+    if (r_val < 1 || r_val > 4) {
+        PT_LOG("Interrupt pin read from hardware is out of range: "
+               "value=%i, acceptable range is 1 - 4\n", r_val);
+        r_val = 0;
+    } else {
+        r_val -= 1;
+    }
+
+    return r_val;
+}
-- 
Anthony PERARD


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