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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH V9 5/8] Introduce Xen PCI Passthrough, qdevice (1/3)
From: Allen Kay <allen.m.kay@xxxxxxxxx>
A more complete history can be found here:
git://xenbits.xensource.com/qemu-xen-unstable.git
Signed-off-by: Allen Kay <allen.m.kay@xxxxxxxxx>
Signed-off-by: Guy Zana <guy@xxxxxxxxxxxx>
Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
Makefile.target | 2 +
hw/xen_common.h | 3 +
hw/xen_pci_passthrough.c | 808 ++++++++++++++++++++++++++++++++++
hw/xen_pci_passthrough.h | 250 +++++++++++
hw/xen_pci_passthrough_config_init.c | 11 +
xen-all.c | 12 +
6 files changed, 1086 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_config_init.c
diff --git a/Makefile.target b/Makefile.target
index 0ccfd5b..1869f0d 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -234,6 +234,8 @@ 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_config_init.o
# Inter-VM PCI shared memory
CONFIG_IVSHMEM =
diff --git a/hw/xen_common.h b/hw/xen_common.h
index 0409ac7..48916fd 100644
--- a/hw/xen_common.h
+++ b/hw/xen_common.h
@@ -135,4 +135,7 @@ static inline int xc_fd(xc_interface *xen_xc)
void destroy_hvm_domain(void);
+/* shutdown/destroy current domain because of an error */
+void xen_shutdown_fatal_error(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
+
#endif /* QEMU_HW_XEN_COMMON_H */
diff --git a/hw/xen_pci_passthrough.c b/hw/xen_pci_passthrough.c
new file mode 100644
index 0000000..d91b48e
--- /dev/null
+++ b/hw/xen_pci_passthrough.c
@@ -0,0 +1,808 @@
+/*
+ * 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'
+ * - Set real bit to '0' if assigned_device->machine_irq isn't '0'.
+ *
+ * Write '1'
+ * - Set real bit to '1'.
+ */
+
+#include <sys/ioctl.h>
+
+#include "pci.h"
+#include "xen.h"
+#include "xen_backend.h"
+#include "xen_pci_passthrough.h"
+#include "range.h"
+
+#define PCI_BAR_ENTRIES (6)
+
+#define PT_NR_IRQS (256)
+uint8_t mapped_machine_irq[PT_NR_IRQS] = {0};
+
+void pt_log(const PCIDevice *d, const char *f, ...)
+{
+ va_list ap;
+
+ va_start(ap, f);
+ if (d) {
+ fprintf(stderr, "[%02x:%02x.%x] ", pci_bus_num(d->bus),
+ PCI_SLOT(d->devfn), PCI_FUNC(d->devfn));
+ }
+ vfprintf(stderr, f, ap);
+ va_end(ap);
+}
+
+/* Config Space */
+
+static int pt_pci_config_access_check(PCIDevice *d, uint32_t address, int len)
+{
+ /* check offset range */
+ if (address >= 0xFF) {
+ PT_ERR(d, "Failed to access register with offset exceeding 0xFF. "
+ "(addr: 0x%02x, len: %d)\n", address, len);
+ return -1;
+ }
+
+ /* check read size */
+ if ((len != 1) && (len != 2) && (len != 4)) {
+ PT_ERR(d, "Failed to access register with invalid access length. "
+ "(addr: 0x%02x, len: %d)\n", address, len);
+ return -1;
+ }
+
+ /* check offset alignment */
+ if (address & (len - 1)) {
+ PT_ERR(d, "Failed to access register with invalid access size "
+ "alignment. (addr: 0x%02x, len: %d)\n", 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 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 (pt_pci_config_access_check(d, addr, len)) {
+ goto exit;
+ }
+
+ /* find register group entry */
+ reg_grp_entry = pt_find_reg_grp(s, addr);
+ 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, addr, (uint8_t *)&val, len);
+ if (rc < 0) {
+ 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 = 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:
+ PT_LOG_CONFIG(d, addr, val, len);
+ return val;
+}
+
+static void 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 (pt_pci_config_access_check(d, addr, len)) {
+ return;
+ }
+
+ PT_LOG_CONFIG(d, addr, val, len);
+
+ /* check unused BAR register */
+ index = pt_bar_offset_to_index(addr);
+ if ((index >= 0) && (val > 0 && val < PT_BAR_ALLF) &&
+ (s->bases[index].bar_flag == PT_BAR_FLAG_UNUSED)) {
+ 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 = pt_find_reg_grp(s, addr);
+ if (reg_grp_entry) {
+ /* check 0-Hardwired register group */
+ if (reg_grp_entry->reg_grp->grp_type == GRP_TYPE_HARDWIRED) {
+ /* ignore silently */
+ PT_WARN(d, "Access to 0-Hardwired register. "
+ "(addr: 0x%02x, len: %d)\n", addr, len);
+ return;
+ }
+ }
+
+ rc = host_pci_get_block(s->real_device, addr, (uint8_t *)&read_val, len);
+ if (rc < 0) {
+ 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 = 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 host_pci_device */
+ val >>= (addr & 3) << 3;
+
+ memory_region_transaction_commit();
+
+out:
+ if (!(reg && reg->no_wb)) {
+ /* unknown regs are passed through */
+ rc = host_pci_set_block(s->real_device, addr, (uint8_t *)&val, len);
+
+ if (rc < 0) {
+ PT_ERR(d, "pci_write_block failed. return value: %d.\n", rc);
+ }
+ }
+}
+
+/* register regions */
+
+static uint64_t 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. */
+ PT_ERR(d, "Should not read BAR through QEMU. @0x"TARGET_FMT_plx"\n", addr);
+ return 0;
+}
+static void bar_write(void *o, target_phys_addr_t a, uint64_t v, unsigned s)
+{
+ PCIDevice *d = o;
+ /* Same comment as bar_read function */
+ PT_ERR(d, "Should not write BAR through QEMU. @0x"TARGET_FMT_plx"\n", a);
+}
+
+static const MemoryRegionOps ops = {
+ .endianness = DEVICE_NATIVE_ENDIAN,
+ .read = bar_read,
+ .write = bar_write,
+};
+
+static int pt_register_regions(XenPCIPassthroughState *s)
+{
+ int i = 0;
+ HostPCIDevice *d = s->real_device;
+
+ /* Register PIO/MMIO BARs */
+ for (i = 0; i < PCI_BAR_ENTRIES; i++) {
+ HostPCIIORegion *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->flags & IORESOURCE_IO) {
+ type = PCI_BASE_ADDRESS_SPACE_IO;
+ } else {
+ type = PCI_BASE_ADDRESS_SPACE_MEMORY;
+ if (r->flags & IORESOURCE_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]);
+
+ 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 (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;
+ 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);
+
+ 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 pt_unregister_regions(XenPCIPassthroughState *s)
+{
+ HostPCIDevice *d = s->real_device;
+ int i;
+
+ for (i = 0; i < PCI_NUM_REGIONS - 1; i++) {
+ HostPCIIORegion *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 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 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)) {
+ PT_WARN(&s->dev, "Overlapped to device [%02x:%02x.%x] 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 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 = pt_bar_from_region(s, mr);
+ if (bar == -1) {
+ return;
+ }
+
+ args.type = d->io_regions[bar].type;
+ pci_for_each_device(d->bus, pci_bus_num(d->bus), check_bar_overlap, &args);
+ if (args.rc) {
+ 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) {
+ 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,
+ PFN(guest_addr + XC_PAGE_SIZE - 1),
+ PFN(machine_addr + XC_PAGE_SIZE - 1),
+ PFN(size),
+ op);
+ if (rc) {
+ PT_ERR(d, "%s mem mapping failed! (rc: %i)\n",
+ adding ? "create new" : "remove old", rc);
+ }
+ }
+}
+
+static void pt_begin(MemoryListener *l)
+{
+}
+
+static void pt_commit(MemoryListener *l)
+{
+}
+
+static void pt_region_add(MemoryListener *l, MemoryRegionSection *sec)
+{
+ XenPCIPassthroughState *s = container_of(l, XenPCIPassthroughState,
+ memory_listener);
+
+ pt_region_update(s, sec, true);
+}
+
+static void pt_region_del(MemoryListener *l, MemoryRegionSection *sec)
+{
+ XenPCIPassthroughState *s = container_of(l, XenPCIPassthroughState,
+ memory_listener);
+
+ pt_region_update(s, sec, false);
+}
+
+static void pt_region_nop(MemoryListener *l, MemoryRegionSection *s)
+{
+}
+
+static void pt_log_fns(MemoryListener *l, MemoryRegionSection *s)
+{
+}
+
+static void pt_log_global_fns(MemoryListener *l)
+{
+}
+
+static void pt_eventfd_fns(MemoryListener *l, MemoryRegionSection *s,
+ bool match_data, uint64_t data, int fd)
+{
+}
+
+static const MemoryListener xen_pt_memory_listener = {
+ .begin = pt_begin,
+ .commit = pt_commit,
+ .region_add = pt_region_add,
+ .region_nop = pt_region_nop,
+ .region_del = pt_region_del,
+ .log_start = pt_log_fns,
+ .log_stop = pt_log_fns,
+ .log_sync = pt_log_fns,
+ .log_global_start = pt_log_global_fns,
+ .log_global_stop = pt_log_global_fns,
+ .eventfd_add = pt_eventfd_fns,
+ .eventfd_del = pt_eventfd_fns,
+ .priority = 10,
+};
+
+/* init */
+
+static int pt_initfn(PCIDevice *d)
+{
+ XenPCIPassthroughState *s = DO_UPCAST(XenPCIPassthroughState, dev, d);
+ int dom, bus;
+ unsigned slot, func;
+ int rc = 0;
+ uint8_t machine_irq = 0;
+ int pirq = PT_UNASSIGNED_PIRQ;
+
+ if (pci_parse_devaddr(s->hostaddr, &dom, &bus, &slot, &func) < 0) {
+ PT_ERR(d, "Failed to parse BDF: %s\n", s->hostaddr);
+ return -1;
+ }
+
+ /* register real device */
+ PT_LOG(d, "Assigning real physical device %02x:%02x.%x"
+ " to devfn %#x\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(d, "%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, d->config,
+ PCI_CONFIG_SPACE_SIZE) == -1) {
+ host_pci_device_put(s->real_device);
+ return -1;
+ }
+
+ s->memory_listener = xen_pt_memory_listener;
+
+ /* Handle real device's MMIO/PIO BARs */
+ pt_register_regions(s);
+
+ /* Bind interrupt */
+ if (!s->dev.config[PCI_INTERRUPT_PIN]) {
+ PT_LOG(d, "no pin interrupt\n");
+ goto out;
+ }
+
+ host_pci_get_byte(s->real_device, PCI_INTERRUPT_LINE, &machine_irq);
+ rc = xc_physdev_map_pirq(xen_xc, xen_domid, machine_irq, &pirq);
+
+ if (rc < 0) {
+ 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) */
+ 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 (machine_irq != 0) {
+ uint8_t e_intx = 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) {
+ PT_ERR(d, "Binding of interrupt %i failed! (rc: %d)\n",
+ e_intx, 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_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);
+ PT_LOG(d, "Real physical device %02x:%02x.%x registered successfuly!\n",
+ bus, slot, func);
+
+ return 0;
+}
+
+static int pt_unregister_device(PCIDevice *d)
+{
+ XenPCIPassthroughState *s = DO_UPCAST(XenPCIPassthroughState, dev, d);
+ uint8_t machine_irq = s->machine_irq;
+ uint8_t intx = 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) {
+ 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 (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_ERR(d, "unmapping of interrupt %i failed. (rc: %d)"
+ " But bravely continuing on..\n",
+ machine_irq, rc);
+ }
+ }
+ }
+
+ pt_unregister_regions(s);
+ memory_listener_unregister(&s->memory_listener);
+
+ host_pci_device_put(s->real_device);
+
+ return 0;
+}
+
+static Property xen_pci_passthrough_properties[] = {
+ DEFINE_PROP_STRING("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 = pt_initfn;
+ k->exit = pt_unregister_device;
+ k->config_read = pt_pci_read_config;
+ k->config_write = 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)
diff --git a/hw/xen_pci_passthrough.h b/hw/xen_pci_passthrough.h
new file mode 100644
index 0000000..2c5e83d
--- /dev/null
+++ b/hw/xen_pci_passthrough.h
@@ -0,0 +1,250 @@
+#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 */
+
+void pt_log(const PCIDevice *d, const char *f, ...) GCC_FMT_ATTR(2, 3);
+
+#define PT_ERR(d, _f, _a...) pt_log(d, "%s: Error: " _f, __func__, ##_a)
+
+#ifdef PT_LOGGING_ENABLED
+# define PT_LOG(d, _f, _a...) pt_log(d, "%s: " _f, __func__, ##_a)
+# define PT_WARN(d, _f, _a...) pt_log(d, "%s: Warning: " _f, __func__, ##_a)
+#else
+# define PT_LOG(d, _f, _a...)
+# define PT_WARN(d, _f, _a...)
+#endif
+
+#ifdef PT_DEBUG_PCI_CONFIG_ACCESS
+# define PT_LOG_CONFIG(d, addr, val, len) \
+ pt_log(d, "%s: address=0x%04x val=0x%08x len=%d\n", \
+ __func__, addr, val, len)
+#else
+# define PT_LOG_CONFIG(d, addr, val, len)
+#endif
+
+
+/* Helper */
+#define PFN(x) ((x) >> XC_PAGE_SHIFT)
+
+typedef struct XenPTRegInfo XenPTRegInfo;
+typedef struct XenPTReg XenPTReg;
+
+typedef struct XenPCIPassthroughState XenPCIPassthroughState;
+
+/* function type for config reg */
+typedef int (*conf_reg_init)
+ (XenPCIPassthroughState *, XenPTRegInfo *, uint32_t real_offset,
+ uint32_t *data);
+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);
+
+#define PT_BAR_ALLF 0xFFFFFFFF /* BAR ALLF value */
+#define PT_PCI_BAR_UNMAPPED (-1)
+
+
+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 {
+ /* 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 function pointer
+ * for double_word/word/byte size */
+ union {
+ struct {
+ conf_dword_write write;
+ conf_dword_read read;
+ } dw;
+ struct {
+ conf_word_write write;
+ conf_word_read read;
+ } w;
+ struct {
+ conf_byte_write write;
+ conf_byte_read read;
+ } b;
+ } u;
+};
+
+/* emulated register management */
+struct XenPTReg {
+ QLIST_ENTRY(XenPTReg) entries;
+ XenPTRegInfo *reg;
+ uint32_t data; /* emulated value */
+};
+
+typedef struct XenPTRegGroupInfo XenPTRegGroupInfo;
+
+/* emul reg group size initialize method */
+typedef int (*pt_reg_size_init_fn)
+ (XenPCIPassthroughState *, const XenPTRegGroupInfo *,
+ uint32_t base_offset, uint8_t *size);
+
+/* 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;
+
+
+#define PT_UNASSIGNED_PIRQ (-1)
+
+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;
+
+ MemoryRegion bar[PCI_NUM_REGIONS - 1];
+ MemoryRegion rom;
+
+ MemoryListener memory_listener;
+};
+
+int pt_config_init(XenPCIPassthroughState *s);
+void pt_config_delete(XenPCIPassthroughState *s);
+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 */
+/* The PCI Local Bus Specification, Rev. 3.0,
+ * Section 6.2.4 Miscellaneous Registers, pp 223
+ * outlines 5 valid values for the interrupt 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
+ */
+
+static inline uint8_t pci_read_intx(XenPCIPassthroughState *s)
+{
+ uint8_t v = 0;
+ host_pci_get_byte(s->real_device, PCI_INTERRUPT_PIN, &v);
+ return v;
+}
+
+static inline uint8_t pci_intx(XenPCIPassthroughState *s)
+{
+ uint8_t r_val = pci_read_intx(s);
+
+ PT_LOG(&s->dev, "intx=%i\n", r_val);
+ if (r_val < 1 || r_val > 4) {
+ PT_LOG(&s->dev, "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;
+}
+
+#endif /* !QEMU_HW_XEN_PCI_PASSTHROUGH_H */
diff --git a/hw/xen_pci_passthrough_config_init.c
b/hw/xen_pci_passthrough_config_init.c
new file mode 100644
index 0000000..1e9de64
--- /dev/null
+++ b/hw/xen_pci_passthrough_config_init.c
@@ -0,0 +1,11 @@
+#include "xen_pci_passthrough.h"
+
+XenPTRegGroup *pt_find_reg_grp(XenPCIPassthroughState *s, uint32_t address)
+{
+ return NULL;
+}
+
+XenPTReg *pt_find_reg(XenPTRegGroup *reg_grp, uint32_t address)
+{
+ return NULL;
+}
diff --git a/xen-all.c b/xen-all.c
index 3e6de41..e9daf8e 100644
--- a/xen-all.c
+++ b/xen-all.c
@@ -1145,3 +1145,15 @@ void xen_register_framebuffer(MemoryRegion *mr)
{
framebuffer = mr;
}
+
+void xen_shutdown_fatal_error(const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ vfprintf(stderr, fmt, ap);
+ va_end(ap);
+ fprintf(stderr, "Will destroy the domain.\n");
+ /* destroy the domain */
+ qemu_system_shutdown_request();
+}
--
Anthony PERARD
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