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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH RFC V1 08/11] Introduce Xen PCI Passthrough, qdevice (1/3)
Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
hw/xen_pci_passthrough.c | 763 ++++++++++++++++++++++++++++++++++++++
hw/xen_pci_passthrough.h | 335 +++++++++++++++++
hw/xen_pci_passthrough_helpers.c | 46 +++
3 files changed, 1144 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/hw/xen_pci_passthrough.c b/hw/xen_pci_passthrough.c
new file mode 100644
index 0000000..bfbe042
--- /dev/null
+++ b/hw/xen_pci_passthrough.c
@@ -0,0 +1,763 @@
+#include <sys/ioctl.h>
+
+#include "pci.h"
+#include "xen.h"
+#include "xen_backend.h"
+#include "xen_pci_passthrough.h"
+
+#define PCI_BAR_ENTRIES (6)
+
+typedef struct PlugDevice {
+ uint8_t r_bus;
+ uint8_t r_slot;
+ uint8_t r_func;
+ int bus;
+ int slot;
+ int func;
+} PlugDevice;
+
+QLIST_HEAD(php_dev_list, PlugDevice) php_dev_list =
+ QLIST_HEAD_INITIALIZER(php_dev_list);
+
+#define PT_BAR_ALLF 0xFFFFFFFF /* BAR ALLF value */
+
+/* #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 untill previous power state transition is completed.
+ * so finished previous request here.
+ */
+ qemu_run_one_timer(s->pm_state->pm_timer);
+ }
+
+ /* 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_read_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.
+ */
+ qemu_run_one_timer(s->pm_state->pm_timer);
+ }
+
+ /* 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_read_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_write_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) {
+ /* set QEMUTimer */
+ 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) {
+ add_msix_mapping(s, i);
+ /* 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");
+ }
+
+ ret = remove_msix_mapping(s, i);
+ if (ret != 0) {
+ PT_LOG("Error: remove MSI-X mmio mapping failed!\n");
+ }
+
+ if (old_ebase != e_phys && old_ebase != -1) {
+ pt_msix_update_remap(s, i);
+ }
+ }
+}
+
+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 */
+int qemu_pci_register_regions(XenPCIPassthroughState *s)
+{
+ /* but no mapping done anymore (see in reset) */
+ 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++) {
+ if (pt_pci_base_addr(d->base_addr[i])) {
+ s->bases[i].e_physbase = pt_pci_base_addr(d->base_addr[i]);
+ s->bases[i].access.u = pt_pci_base_addr(d->base_addr[i]);
+
+ /* Register current region */
+ if (d->base_addr[i] & PCI_BASE_ADDRESS_SPACE_IO) {
+ memory_region_init_io(&s->bar[i], NULL, NULL,
+ "xen-pci-pt-bar", d->size[i]);
+ pci_register_bar(&s->dev, i, PCI_BASE_ADDRESS_SPACE_IO,
+ &s->bar[i]);
+ } else if (d->base_addr[i] & PCI_BASE_ADDRESS_MEM_PREFETCH) {
+ memory_region_init_io(&s->bar[i], NULL, NULL,
+ "xen-pci-pt-bar", d->size[i]);
+ 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", d->size[i]);
+ 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",
+ d->size[i], d->base_addr[i]);
+ }
+ }
+
+ /* Register expansion ROM address */
+ if ((d->rom_base_addr & PCI_ROM_ADDRESS_MASK) && d->rom_size) {
+ /* Re-set BAR reported by OS, otherwise ROM can't be read. */
+ bar_data = host_pci_read_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_write_long(d, PCI_ROM_ADDRESS, bar_data);
+ }
+
+ s->bases[PCI_ROM_SLOT].e_physbase = d->rom_base_addr &
PCI_ROM_ADDRESS_MASK;
+ s->bases[PCI_ROM_SLOT].access.maddr = d->rom_base_addr &
PCI_ROM_ADDRESS_MASK;
+
+ // memory_region_init_rom_device
+ 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 int pci_parse_host_devaddr(char **str, int *seg, int *bus, int *dev,
+ int *func, char **opt, int *vdevfn)
+{
+ char *token;
+ const char *delim = ":.";
+
+ if (!(*str) || (!strchr(*str, ':') && !strchr(*str, '.'))) {
+ return 0;
+ }
+
+ token = strsep(str, delim);
+ *seg = strtoul(token, NULL, 16);
+
+ token = strsep(str, delim);
+ *bus = strtoul(token, NULL, 16);
+
+ token = strsep(str, delim);
+ *dev = strtoul(token, NULL, 16);
+
+ token = strsep(str, delim);
+
+ *opt = strchr(token, '@');
+ if (*opt) {
+ *(*opt)++ = '\0';
+ *vdevfn = strtoul(*opt, NULL, 16);
+ } else {
+ *vdevfn = -1; //AUTO_PHP_SLOT;
+ *opt = token;
+ }
+
+ *opt = strchr(*opt, ',');
+ if (*opt) {
+ *(*opt)++ = '\0';
+ }
+
+ *func = strtoul(token, NULL, 16);
+
+ return 1;
+}
+
+// TODO add to PlugDevice list php_dev_list;
+static int pt_initfn(PCIDevice *pci_dev)
+{
+ XenPCIPassthroughState *s = DO_UPCAST(XenPCIPassthroughState, dev,
pci_dev);
+ int devfn_ignored = -1;
+ int dom, bus;
+ int slot, func;
+ char *opt;
+ int rc = 0;
+ uint32_t machine_irq;
+
+ /* todo: use local/stack buf, or better: change pci_parse_host_devaddr */
+ char *addr = g_strdup(s->hostaddr);
+
+ PT_LOG("initialiase passthrough for %s (devfn: %i)\n", addr, s->dev.devfn);
+
+ if (pci_parse_host_devaddr(&addr, &dom, &bus, &slot, &func, &opt,
+ &devfn_ignored) < 0) {
+ fprintf(stderr, "erro parse bdf: %s\n", addr);
+ return -1;
+ }
+
+ s->php_dev.r_bus = bus;
+ s->php_dev.r_dev = slot;
+ s->php_dev.r_func = func;
+
+ /* register real device */
+ PT_LOG("Assigning real physical device %02x:%02x.%x ...\n",
+ bus, slot, func);
+
+ s->real_device = host_pci_device_get(bus, slot, func);
+ if (!s->real_device) {
+ return -1;
+ }
+
+ s->msi_trans_cap = 1; // default enable, later, read from param (xenstore)
+ /* s->power_mgmt = power_mgmt; */
+ 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_read_block(s->real_device, 0, pci_dev->config,
+ PCI_CONFIG_SPACE_SIZE) == -1) {
+ return -1;
+ }
+
+ /* Handle real device's MMIO/PIO BARs */
+ qemu_pci_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;
+ }
+
+ /* pt machine irq auto */
+ {
+ int pirq = -1;
+
+ machine_irq = host_pci_read_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_write_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]++; */
+ }
+ }
+
+ /* setup MSI-INTx translation if support */
+ rc = pt_enable_msi_translate(s);
+
+ /* 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_write_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,
+ s->msi_trans_en ? "MSI-INTx" : "INTx");
+
+ return 0;
+}
+
+static PCIDeviceInfo xen_pci_passthrough = {
+ .init = pt_initfn,
+ .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_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..10e8189
--- /dev/null
+++ b/hw/xen_pci_passthrough.h
@@ -0,0 +1,335 @@
+#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 XenPTRegion XenPTRegion;
+typedef struct XenPTReg XenPTReg;
+typedef struct XenPTRegInfo XenPTRegInfo;
+typedef struct XenPTRegGroup XenPTRegGroup;
+typedef struct XenPTRegGroupInfo XenPTRegGroupInfo;
+
+typedef struct XenPCIPassthroughState XenPCIPassthroughState;
+
+// fonction 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);
+
+struct PHPDev {
+ /* uint8_t valid; */
+ uint8_t r_bus;
+ uint8_t r_dev;
+ uint8_t r_func;
+ /* char *opt; */
+};
+
+/* power state transition */
+#define PT_FLAG_TRANSITING 0x0001
+
+#define PT_INVALID_REG 0xFFFFFFFF /* invalid register value */
+#define PT_BAR_ALLF 0xFFFFFFFF /* BAR ALLF value */
+#define PT_BAR_MEM_RO_MASK 0x0000000F /* BAR ReadOnly mask(Memory) */
+#define PT_BAR_MEM_EMU_MASK 0xFFFFFFF0 /* BAR emul mask(Memory) */
+#define PT_BAR_IO_RO_MASK 0x00000003 /* BAR ReadOnly mask(I/O) */
+#define PT_BAR_IO_EMU_MASK 0xFFFFFFFC /* BAR emul mask(I/O) */
+
+/* MSI-X */
+#define MSI_FLAG_UNINIT 0x1000
+#define PT_MSI_MAPPED 0x2000
+
+#define MSI_DATA_VECTOR_SHIFT 0
+#define MSI_DATA_VECTOR(v) (((u8)v) << MSI_DATA_VECTOR_SHIFT)
+
+#define MSI_DATA_DELIVERY_SHIFT 8
+#define MSI_DATA_DELIVERY_FIXED (0 << MSI_DATA_DELIVERY_SHIFT)
+#define MSI_DATA_DELIVERY_LOWPRI (1 << MSI_DATA_DELIVERY_SHIFT)
+
+#define MSI_DATA_LEVEL_SHIFT 14
+#define MSI_DATA_LEVEL_DEASSERT (0 << MSI_DATA_LEVEL_SHIFT)
+#define MSI_DATA_LEVEL_ASSERT (1 << MSI_DATA_LEVEL_SHIFT)
+
+#define MSI_DATA_TRIGGER_SHIFT 15
+#define MSI_DATA_TRIGGER_EDGE (0 << MSI_DATA_TRIGGER_SHIFT)
+#define MSI_DATA_TRIGGER_LEVEL (1 << MSI_DATA_TRIGGER_SHIFT)
+
+/*
+ * Shift/mask fields for APIC-based bus address
+ */
+#define MSI_ADDR_HEADER 0xfee00000
+#define MSI_TARGET_CPU_SHIFT 12
+
+#define MSI_ADDR_DESTID_MASK 0xfff0000f
+#define MSI_ADDR_DESTID_CPU(cpu) ((cpu) << MSI_TARGET_CPU_SHIFT)
+
+#define MSI_ADDR_DESTMODE_SHIFT 2
+#define MSI_ADDR_DESTMODE_PHYS (0 << MSI_ADDR_DESTMODE_SHIFT)
+#define MSI_ADDR_DESTMODE_LOGIC (1 << MSI_ADDR_DESTMODE_SHIFT)
+
+#define MSI_ADDR_REDIRECTION_SHIFT 3
+#define MSI_ADDR_REDIRECTION_CPU (0 << MSI_ADDR_REDIRECTION_SHIFT)
+#define MSI_ADDR_REDIRECTION_LOWPRI (1 << MSI_ADDR_REDIRECTION_SHIFT)
+
+#define AUTO_ASSIGN -1
+
+/* shift count for gflags */
+#define GFLAGS_SHIFT_DEST_ID 0
+#define GFLAGS_SHIFT_RH 8
+#define GFLAGS_SHIFT_DM 9
+#define GLFAGS_SHIFT_DELIV_MODE 12
+#define GLFAGS_SHIFT_TRG_MODE 15
+
+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;
+
+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;
+};
+
+/* emulated register management */
+struct XenPTReg {
+ QLIST_ENTRY(XenPTReg) entries;
+ XenPTRegInfo *reg;
+ uint32_t data;
+};
+
+/* emul register group management table */
+struct XenPTRegGroup {
+ QLIST_ENTRY (XenPTRegGroup) entries;
+ const XenPTRegGroupInfo *reg_grp;
+ uint32_t base_offset;
+ uint8_t size;
+ QLIST_HEAD(, XenPTReg) reg_tbl_list;
+};
+
+/* 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;
+};
+
+
+/* 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;
+};
+
+typedef struct pt_msi_info {
+ uint32_t flags;
+ uint32_t ctrl_offset; /* saved control offset */
+ int pirq; /* guest pirq corresponding */
+ uint32_t addr_lo; /* guest message address */
+ uint32_t addr_hi; /* guest message upper address */
+ uint16_t data; /* guest message data */
+} XenPTMSI;
+
+typedef struct msix_entry_info {
+ int pirq; /* -1 means unmapped */
+ int flags; /* flags indicting whether MSI ADDR or DATA is updated */
+ uint32_t io_mem[4];
+} XenMSIXEntry;
+typedef struct pt_msix_info {
+ uint32_t ctrl_offset;
+ int enabled;
+ int total_entries;
+ int bar_index;
+ uint64_t table_base;
+ uint32_t table_off;
+ uint32_t table_offset_adjust; /* page align mmap */
+ uint64_t mmio_base_addr;
+ int mmio_index;
+ void *phys_iomem_base;
+ struct msix_entry_info msix_entry[0];
+} XenPTMSIX;
+
+typedef struct pt_pm_info {
+ 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;
+ struct PHPDev php_dev;
+ bool is_virtfn;
+ HostPCIDevice *real_device;
+ XenPTRegion bases[PCI_NUM_REGIONS]; /* Access regions */
+ QLIST_HEAD(, XenPTRegGroup) reg_grp_tbl;
+
+ uint32_t machine_irq;
+
+ XenPTMSI *msi;
+ XenPTMSIX *msix;
+
+ /* Physical MSI to guest INTx translation when possible */
+ int msi_trans_cap;
+ bool msi_trans_en;
+
+ bool power_mgmt;
+ XenPTPM *pm_state;
+
+ MemoryRegion bar[PCI_NUM_REGIONS - 1];
+ MemoryRegion rom;
+};
+
+void pt_config_init(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);
+
+int qemu_pci_register_regions(XenPCIPassthroughState *);
+
+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;
+ }
+}
+
+static inline pcibus_t pt_pci_base_addr(pcibus_t base)
+{
+ if (base & PCI_BASE_ADDRESS_SPACE_IO)
+ return base & PCI_BASE_ADDRESS_IO_MASK;
+
+ return base & PCI_BASE_ADDRESS_MEM_MASK;
+}
+
+/* INTx */
+static inline uint8_t pci_read_intx(XenPCIPassthroughState *s)
+{
+ return host_pci_read_byte(s->real_device, PCI_INTERRUPT_PIN);
+}
+uint8_t pci_intx(XenPCIPassthroughState *ptdev);
+
+/* MSI/MSI-X */
+void msi_set_enable(XenPCIPassthroughState *dev, int en);
+int pt_msi_setup(XenPCIPassthroughState *dev);
+int pt_msi_update(XenPCIPassthroughState *d);
+void pt_msi_disable(XenPCIPassthroughState *dev);
+int pt_enable_msi_translate(XenPCIPassthroughState* dev);
+void pt_disable_msi_translate(XenPCIPassthroughState *dev);
+
+int pt_msix_init(XenPCIPassthroughState *dev, int pos);
+int pt_msix_update(XenPCIPassthroughState *dev);
+int pt_msix_update_remap(XenPCIPassthroughState *dev, int bar_index);
+void pt_msix_disable(XenPCIPassthroughState *dev);
+int add_msix_mapping(XenPCIPassthroughState *s, int bar_index);
+int remove_msix_mapping(XenPCIPassthroughState *s, int bar_index);
+
+#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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