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-rw-r--r--hw/kvm/Makefile.objs2
-rw-r--r--hw/kvm/pci-assign.c1915
2 files changed, 1916 insertions, 1 deletions
diff --git a/hw/kvm/Makefile.objs b/hw/kvm/Makefile.objs
index 226497a58f..f620d7ff85 100644
--- a/hw/kvm/Makefile.objs
+++ b/hw/kvm/Makefile.objs
@@ -1 +1 @@
-obj-$(CONFIG_KVM) += clock.o apic.o i8259.o ioapic.o i8254.o
+obj-$(CONFIG_KVM) += clock.o apic.o i8259.o ioapic.o i8254.o pci-assign.o
diff --git a/hw/kvm/pci-assign.c b/hw/kvm/pci-assign.c
new file mode 100644
index 0000000000..05b93d9a51
--- /dev/null
+++ b/hw/kvm/pci-assign.c
@@ -0,0 +1,1915 @@
+/*
+ * Copyright (c) 2007, Neocleus Corporation.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ *
+ * Assign a PCI device from the host to a guest VM.
+ *
+ * This implementation uses the classic device assignment interface of KVM
+ * and is only available on x86 hosts. It is expected to be obsoleted by VFIO
+ * based device assignment.
+ *
+ * Adapted for KVM (qemu-kvm) by Qumranet. QEMU version was based on qemu-kvm
+ * revision 4144fe9d48. See its repository for the history.
+ *
+ * Copyright (c) 2007, Neocleus, Alex Novik (alex@neocleus.com)
+ * Copyright (c) 2007, Neocleus, Guy Zana (guy@neocleus.com)
+ * Copyright (C) 2008, Qumranet, Amit Shah (amit.shah@qumranet.com)
+ * Copyright (C) 2008, Red Hat, Amit Shah (amit.shah@redhat.com)
+ * Copyright (C) 2008, IBM, Muli Ben-Yehuda (muli@il.ibm.com)
+ */
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/io.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include "hw/hw.h"
+#include "hw/pc.h"
+#include "qemu-error.h"
+#include "console.h"
+#include "hw/loader.h"
+#include "monitor.h"
+#include "range.h"
+#include "sysemu.h"
+#include "hw/pci.h"
+#include "hw/msi.h"
+#include "kvm_i386.h"
+
+#define MSIX_PAGE_SIZE 0x1000
+
+/* From linux/ioport.h */
+#define IORESOURCE_IO 0x00000100 /* Resource type */
+#define IORESOURCE_MEM 0x00000200
+#define IORESOURCE_IRQ 0x00000400
+#define IORESOURCE_DMA 0x00000800
+#define IORESOURCE_PREFETCH 0x00002000 /* No side effects */
+
+//#define DEVICE_ASSIGNMENT_DEBUG
+
+#ifdef DEVICE_ASSIGNMENT_DEBUG
+#define DEBUG(fmt, ...) \
+ do { \
+ fprintf(stderr, "%s: " fmt, __func__ , __VA_ARGS__); \
+ } while (0)
+#else
+#define DEBUG(fmt, ...)
+#endif
+
+typedef struct PCIRegion {
+ int type; /* Memory or port I/O */
+ int valid;
+ uint64_t base_addr;
+ uint64_t size; /* size of the region */
+ int resource_fd;
+} PCIRegion;
+
+typedef struct PCIDevRegions {
+ uint8_t bus, dev, func; /* Bus inside domain, device and function */
+ int irq; /* IRQ number */
+ uint16_t region_number; /* number of active regions */
+
+ /* Port I/O or MMIO Regions */
+ PCIRegion regions[PCI_NUM_REGIONS - 1];
+ int config_fd;
+} PCIDevRegions;
+
+typedef struct AssignedDevRegion {
+ MemoryRegion container;
+ MemoryRegion real_iomem;
+ union {
+ uint8_t *r_virtbase; /* mmapped access address for memory regions */
+ uint32_t r_baseport; /* the base guest port for I/O regions */
+ } u;
+ pcibus_t e_size; /* emulated size of region in bytes */
+ pcibus_t r_size; /* real size of region in bytes */
+ PCIRegion *region;
+} AssignedDevRegion;
+
+#define ASSIGNED_DEVICE_PREFER_MSI_BIT 0
+#define ASSIGNED_DEVICE_SHARE_INTX_BIT 1
+
+#define ASSIGNED_DEVICE_PREFER_MSI_MASK (1 << ASSIGNED_DEVICE_PREFER_MSI_BIT)
+#define ASSIGNED_DEVICE_SHARE_INTX_MASK (1 << ASSIGNED_DEVICE_SHARE_INTX_BIT)
+
+typedef struct MSIXTableEntry {
+ uint32_t addr_lo;
+ uint32_t addr_hi;
+ uint32_t data;
+ uint32_t ctrl;
+} MSIXTableEntry;
+
+typedef enum AssignedIRQType {
+ ASSIGNED_IRQ_NONE = 0,
+ ASSIGNED_IRQ_INTX_HOST_INTX,
+ ASSIGNED_IRQ_INTX_HOST_MSI,
+ ASSIGNED_IRQ_MSI,
+ ASSIGNED_IRQ_MSIX
+} AssignedIRQType;
+
+typedef struct AssignedDevice {
+ PCIDevice dev;
+ PCIHostDeviceAddress host;
+ uint32_t dev_id;
+ uint32_t features;
+ int intpin;
+ AssignedDevRegion v_addrs[PCI_NUM_REGIONS - 1];
+ PCIDevRegions real_device;
+ PCIINTxRoute intx_route;
+ AssignedIRQType assigned_irq_type;
+ struct {
+#define ASSIGNED_DEVICE_CAP_MSI (1 << 0)
+#define ASSIGNED_DEVICE_CAP_MSIX (1 << 1)
+ uint32_t available;
+#define ASSIGNED_DEVICE_MSI_ENABLED (1 << 0)
+#define ASSIGNED_DEVICE_MSIX_ENABLED (1 << 1)
+#define ASSIGNED_DEVICE_MSIX_MASKED (1 << 2)
+ uint32_t state;
+ } cap;
+ uint8_t emulate_config_read[PCI_CONFIG_SPACE_SIZE];
+ uint8_t emulate_config_write[PCI_CONFIG_SPACE_SIZE];
+ int msi_virq_nr;
+ int *msi_virq;
+ MSIXTableEntry *msix_table;
+ target_phys_addr_t msix_table_addr;
+ uint16_t msix_max;
+ MemoryRegion mmio;
+ char *configfd_name;
+ int32_t bootindex;
+} AssignedDevice;
+
+static void assigned_dev_update_irq_routing(PCIDevice *dev);
+
+static void assigned_dev_load_option_rom(AssignedDevice *dev);
+
+static void assigned_dev_unregister_msix_mmio(AssignedDevice *dev);
+
+static uint64_t assigned_dev_ioport_rw(AssignedDevRegion *dev_region,
+ target_phys_addr_t addr, int size,
+ uint64_t *data)
+{
+ uint64_t val = 0;
+ int fd = dev_region->region->resource_fd;
+
+ if (fd >= 0) {
+ if (data) {
+ DEBUG("pwrite data=%" PRIx64 ", size=%d, e_phys=" TARGET_FMT_plx
+ ", addr="TARGET_FMT_plx"\n", *data, size, addr, addr);
+ if (pwrite(fd, data, size, addr) != size) {
+ error_report("%s - pwrite failed %s",
+ __func__, strerror(errno));
+ }
+ } else {
+ if (pread(fd, &val, size, addr) != size) {
+ error_report("%s - pread failed %s",
+ __func__, strerror(errno));
+ val = (1UL << (size * 8)) - 1;
+ }
+ DEBUG("pread val=%" PRIx64 ", size=%d, e_phys=" TARGET_FMT_plx
+ ", addr=" TARGET_FMT_plx "\n", val, size, addr, addr);
+ }
+ } else {
+ uint32_t port = addr + dev_region->u.r_baseport;
+
+ if (data) {
+ DEBUG("out data=%" PRIx64 ", size=%d, e_phys=" TARGET_FMT_plx
+ ", host=%x\n", *data, size, addr, port);
+ switch (size) {
+ case 1:
+ outb(*data, port);
+ break;
+ case 2:
+ outw(*data, port);
+ break;
+ case 4:
+ outl(*data, port);
+ break;
+ }
+ } else {
+ switch (size) {
+ case 1:
+ val = inb(port);
+ break;
+ case 2:
+ val = inw(port);
+ break;
+ case 4:
+ val = inl(port);
+ break;
+ }
+ DEBUG("in data=%" PRIx64 ", size=%d, e_phys=" TARGET_FMT_plx
+ ", host=%x\n", val, size, addr, port);
+ }
+ }
+ return val;
+}
+
+static void assigned_dev_ioport_write(void *opaque, target_phys_addr_t addr,
+ uint64_t data, unsigned size)
+{
+ assigned_dev_ioport_rw(opaque, addr, size, &data);
+}
+
+static uint64_t assigned_dev_ioport_read(void *opaque,
+ target_phys_addr_t addr, unsigned size)
+{
+ return assigned_dev_ioport_rw(opaque, addr, size, NULL);
+}
+
+static uint32_t slow_bar_readb(void *opaque, target_phys_addr_t addr)
+{
+ AssignedDevRegion *d = opaque;
+ uint8_t *in = d->u.r_virtbase + addr;
+ uint32_t r;
+
+ r = *in;
+ DEBUG("slow_bar_readl addr=0x" TARGET_FMT_plx " val=0x%08x\n", addr, r);
+
+ return r;
+}
+
+static uint32_t slow_bar_readw(void *opaque, target_phys_addr_t addr)
+{
+ AssignedDevRegion *d = opaque;
+ uint16_t *in = (uint16_t *)(d->u.r_virtbase + addr);
+ uint32_t r;
+
+ r = *in;
+ DEBUG("slow_bar_readl addr=0x" TARGET_FMT_plx " val=0x%08x\n", addr, r);
+
+ return r;
+}
+
+static uint32_t slow_bar_readl(void *opaque, target_phys_addr_t addr)
+{
+ AssignedDevRegion *d = opaque;
+ uint32_t *in = (uint32_t *)(d->u.r_virtbase + addr);
+ uint32_t r;
+
+ r = *in;
+ DEBUG("slow_bar_readl addr=0x" TARGET_FMT_plx " val=0x%08x\n", addr, r);
+
+ return r;
+}
+
+static void slow_bar_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
+{
+ AssignedDevRegion *d = opaque;
+ uint8_t *out = d->u.r_virtbase + addr;
+
+ DEBUG("slow_bar_writeb addr=0x" TARGET_FMT_plx " val=0x%02x\n", addr, val);
+ *out = val;
+}
+
+static void slow_bar_writew(void *opaque, target_phys_addr_t addr, uint32_t val)
+{
+ AssignedDevRegion *d = opaque;
+ uint16_t *out = (uint16_t *)(d->u.r_virtbase + addr);
+
+ DEBUG("slow_bar_writew addr=0x" TARGET_FMT_plx " val=0x%04x\n", addr, val);
+ *out = val;
+}
+
+static void slow_bar_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
+{
+ AssignedDevRegion *d = opaque;
+ uint32_t *out = (uint32_t *)(d->u.r_virtbase + addr);
+
+ DEBUG("slow_bar_writel addr=0x" TARGET_FMT_plx " val=0x%08x\n", addr, val);
+ *out = val;
+}
+
+static const MemoryRegionOps slow_bar_ops = {
+ .old_mmio = {
+ .read = { slow_bar_readb, slow_bar_readw, slow_bar_readl, },
+ .write = { slow_bar_writeb, slow_bar_writew, slow_bar_writel, },
+ },
+ .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static void assigned_dev_iomem_setup(PCIDevice *pci_dev, int region_num,
+ pcibus_t e_size)
+{
+ AssignedDevice *r_dev = DO_UPCAST(AssignedDevice, dev, pci_dev);
+ AssignedDevRegion *region = &r_dev->v_addrs[region_num];
+ PCIRegion *real_region = &r_dev->real_device.regions[region_num];
+
+ if (e_size > 0) {
+ memory_region_init(&region->container, "assigned-dev-container",
+ e_size);
+ memory_region_add_subregion(&region->container, 0, &region->real_iomem);
+
+ /* deal with MSI-X MMIO page */
+ if (real_region->base_addr <= r_dev->msix_table_addr &&
+ real_region->base_addr + real_region->size >
+ r_dev->msix_table_addr) {
+ uint64_t offset = r_dev->msix_table_addr - real_region->base_addr;
+
+ memory_region_add_subregion_overlap(&region->container,
+ offset,
+ &r_dev->mmio,
+ 1);
+ }
+ }
+}
+
+static const MemoryRegionOps assigned_dev_ioport_ops = {
+ .read = assigned_dev_ioport_read,
+ .write = assigned_dev_ioport_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static void assigned_dev_ioport_setup(PCIDevice *pci_dev, int region_num,
+ pcibus_t size)
+{
+ AssignedDevice *r_dev = DO_UPCAST(AssignedDevice, dev, pci_dev);
+ AssignedDevRegion *region = &r_dev->v_addrs[region_num];
+
+ region->e_size = size;
+ memory_region_init(&region->container, "assigned-dev-container", size);
+ memory_region_init_io(&region->real_iomem, &assigned_dev_ioport_ops,
+ r_dev->v_addrs + region_num,
+ "assigned-dev-iomem", size);
+ memory_region_add_subregion(&region->container, 0, &region->real_iomem);
+}
+
+static uint32_t assigned_dev_pci_read(PCIDevice *d, int pos, int len)
+{
+ AssignedDevice *pci_dev = DO_UPCAST(AssignedDevice, dev, d);
+ uint32_t val;
+ ssize_t ret;
+ int fd = pci_dev->real_device.config_fd;
+
+again:
+ ret = pread(fd, &val, len, pos);
+ if (ret != len) {
+ if ((ret < 0) && (errno == EINTR || errno == EAGAIN)) {
+ goto again;
+ }
+
+ hw_error("pci read failed, ret = %zd errno = %d\n", ret, errno);
+ }
+
+ return val;
+}
+
+static uint8_t assigned_dev_pci_read_byte(PCIDevice *d, int pos)
+{
+ return (uint8_t)assigned_dev_pci_read(d, pos, 1);
+}
+
+static void assigned_dev_pci_write(PCIDevice *d, int pos, uint32_t val, int len)
+{
+ AssignedDevice *pci_dev = DO_UPCAST(AssignedDevice, dev, d);
+ ssize_t ret;
+ int fd = pci_dev->real_device.config_fd;
+
+again:
+ ret = pwrite(fd, &val, len, pos);
+ if (ret != len) {
+ if ((ret < 0) && (errno == EINTR || errno == EAGAIN)) {
+ goto again;
+ }
+
+ hw_error("pci write failed, ret = %zd errno = %d\n", ret, errno);
+ }
+}
+
+static void assigned_dev_emulate_config_read(AssignedDevice *dev,
+ uint32_t offset, uint32_t len)
+{
+ memset(dev->emulate_config_read + offset, 0xff, len);
+}
+
+static void assigned_dev_direct_config_read(AssignedDevice *dev,
+ uint32_t offset, uint32_t len)
+{
+ memset(dev->emulate_config_read + offset, 0, len);
+}
+
+static void assigned_dev_direct_config_write(AssignedDevice *dev,
+ uint32_t offset, uint32_t len)
+{
+ memset(dev->emulate_config_write + offset, 0, len);
+}
+
+static uint8_t pci_find_cap_offset(PCIDevice *d, uint8_t cap, uint8_t start)
+{
+ int id;
+ int max_cap = 48;
+ int pos = start ? start : PCI_CAPABILITY_LIST;
+ int status;
+
+ status = assigned_dev_pci_read_byte(d, PCI_STATUS);
+ if ((status & PCI_STATUS_CAP_LIST) == 0) {
+ return 0;
+ }
+
+ while (max_cap--) {
+ pos = assigned_dev_pci_read_byte(d, pos);
+ if (pos < 0x40) {
+ break;
+ }
+
+ pos &= ~3;
+ id = assigned_dev_pci_read_byte(d, pos + PCI_CAP_LIST_ID);
+
+ if (id == 0xff) {
+ break;
+ }
+ if (id == cap) {
+ return pos;
+ }
+
+ pos += PCI_CAP_LIST_NEXT;
+ }
+ return 0;
+}
+
+static int assigned_dev_register_regions(PCIRegion *io_regions,
+ unsigned long regions_num,
+ AssignedDevice *pci_dev)
+{
+ uint32_t i;
+ PCIRegion *cur_region = io_regions;
+
+ for (i = 0; i < regions_num; i++, cur_region++) {
+ if (!cur_region->valid) {
+ continue;
+ }
+
+ /* handle memory io regions */
+ if (cur_region->type & IORESOURCE_MEM) {
+ int t = cur_region->type & IORESOURCE_PREFETCH
+ ? PCI_BASE_ADDRESS_MEM_PREFETCH
+ : PCI_BASE_ADDRESS_SPACE_MEMORY;
+
+ /* map physical memory */
+ pci_dev->v_addrs[i].u.r_virtbase = mmap(NULL, cur_region->size,
+ PROT_WRITE | PROT_READ,
+ MAP_SHARED,
+ cur_region->resource_fd,
+ (off_t)0);
+
+ if (pci_dev->v_addrs[i].u.r_virtbase == MAP_FAILED) {
+ pci_dev->v_addrs[i].u.r_virtbase = NULL;
+ error_report("%s: Error: Couldn't mmap 0x%" PRIx64 "!",
+ __func__, cur_region->base_addr);
+ return -1;
+ }
+
+ pci_dev->v_addrs[i].r_size = cur_region->size;
+ pci_dev->v_addrs[i].e_size = 0;
+
+ /* add offset */
+ pci_dev->v_addrs[i].u.r_virtbase +=
+ (cur_region->base_addr & 0xFFF);
+
+ if (cur_region->size & 0xFFF) {
+ error_report("PCI region %d at address 0x%" PRIx64 " has "
+ "size 0x%" PRIx64 ", which is not a multiple of "
+ "4K. You might experience some performance hit "
+ "due to that.",
+ i, cur_region->base_addr, cur_region->size);
+ memory_region_init_io(&pci_dev->v_addrs[i].real_iomem,
+ &slow_bar_ops, &pci_dev->v_addrs[i],
+ "assigned-dev-slow-bar",
+ cur_region->size);
+ } else {
+ void *virtbase = pci_dev->v_addrs[i].u.r_virtbase;
+ char name[32];
+ snprintf(name, sizeof(name), "%s.bar%d",
+ object_get_typename(OBJECT(pci_dev)), i);
+ memory_region_init_ram_ptr(&pci_dev->v_addrs[i].real_iomem,
+ name, cur_region->size,
+ virtbase);
+ vmstate_register_ram(&pci_dev->v_addrs[i].real_iomem,
+ &pci_dev->dev.qdev);
+ }
+
+ assigned_dev_iomem_setup(&pci_dev->dev, i, cur_region->size);
+ pci_register_bar((PCIDevice *) pci_dev, i, t,
+ &pci_dev->v_addrs[i].container);
+ continue;
+ } else {
+ /* handle port io regions */
+ uint32_t val;
+ int ret;
+
+ /* Test kernel support for ioport resource read/write. Old
+ * kernels return EIO. New kernels only allow 1/2/4 byte reads
+ * so should return EINVAL for a 3 byte read */
+ ret = pread(pci_dev->v_addrs[i].region->resource_fd, &val, 3, 0);
+ if (ret >= 0) {
+ error_report("Unexpected return from I/O port read: %d", ret);
+ abort();
+ } else if (errno != EINVAL) {
+ error_report("Kernel doesn't support ioport resource "
+ "access, hiding this region.");
+ close(pci_dev->v_addrs[i].region->resource_fd);
+ cur_region->valid = 0;
+ continue;
+ }
+
+ pci_dev->v_addrs[i].u.r_baseport = cur_region->base_addr;
+ pci_dev->v_addrs[i].r_size = cur_region->size;
+ pci_dev->v_addrs[i].e_size = 0;
+
+ assigned_dev_ioport_setup(&pci_dev->dev, i, cur_region->size);
+ pci_register_bar((PCIDevice *) pci_dev, i,
+ PCI_BASE_ADDRESS_SPACE_IO,
+ &pci_dev->v_addrs[i].container);
+ }
+ }
+
+ /* success */
+ return 0;
+}
+
+static int get_real_id(const char *devpath, const char *idname, uint16_t *val)
+{
+ FILE *f;
+ char name[128];
+ long id;
+
+ snprintf(name, sizeof(name), "%s%s", devpath, idname);
+ f = fopen(name, "r");
+ if (f == NULL) {
+ error_report("%s: %s: %m", __func__, name);
+ return -1;
+ }
+ if (fscanf(f, "%li\n", &id) == 1) {
+ *val = id;
+ } else {
+ return -1;
+ }
+ fclose(f);
+
+ return 0;
+}
+
+static int get_real_vendor_id(const char *devpath, uint16_t *val)
+{
+ return get_real_id(devpath, "vendor", val);
+}
+
+static int get_real_device_id(const char *devpath, uint16_t *val)
+{
+ return get_real_id(devpath, "device", val);
+}
+
+static int get_real_device(AssignedDevice *pci_dev, uint16_t r_seg,
+ uint8_t r_bus, uint8_t r_dev, uint8_t r_func)
+{
+ char dir[128], name[128];
+ int fd, r = 0, v;
+ FILE *f;
+ uint64_t start, end, size, flags;
+ uint16_t id;
+ PCIRegion *rp;
+ PCIDevRegions *dev = &pci_dev->real_device;
+
+ dev->region_number = 0;
+
+ snprintf(dir, sizeof(dir), "/sys/bus/pci/devices/%04x:%02x:%02x.%x/",
+ r_seg, r_bus, r_dev, r_func);
+
+ snprintf(name, sizeof(name), "%sconfig", dir);
+
+ if (pci_dev->configfd_name && *pci_dev->configfd_name) {
+ if (qemu_isdigit(pci_dev->configfd_name[0])) {
+ dev->config_fd = strtol(pci_dev->configfd_name, NULL, 0);
+ } else {
+ dev->config_fd = monitor_get_fd(cur_mon, pci_dev->configfd_name);
+ if (dev->config_fd < 0) {
+ error_report("%s: (%s) unkown", __func__,
+ pci_dev->configfd_name);
+ return 1;
+ }
+ }
+ } else {
+ dev->config_fd = open(name, O_RDWR);
+
+ if (dev->config_fd == -1) {
+ error_report("%s: %s: %m", __func__, name);
+ return 1;
+ }
+ }
+again:
+ r = read(dev->config_fd, pci_dev->dev.config,
+ pci_config_size(&pci_dev->dev));
+ if (r < 0) {
+ if (errno == EINTR || errno == EAGAIN) {
+ goto again;
+ }
+ error_report("%s: read failed, errno = %d", __func__, errno);
+ }
+
+ /* Restore or clear multifunction, this is always controlled by qemu */
+ if (pci_dev->dev.cap_present & QEMU_PCI_CAP_MULTIFUNCTION) {
+ pci_dev->dev.config[PCI_HEADER_TYPE] |= PCI_HEADER_TYPE_MULTI_FUNCTION;
+ } else {
+ pci_dev->dev.config[PCI_HEADER_TYPE] &= ~PCI_HEADER_TYPE_MULTI_FUNCTION;
+ }
+
+ /* Clear host resource mapping info. If we choose not to register a
+ * BAR, such as might be the case with the option ROM, we can get
+ * confusing, unwritable, residual addresses from the host here. */
+ memset(&pci_dev->dev.config[PCI_BASE_ADDRESS_0], 0, 24);
+ memset(&pci_dev->dev.config[PCI_ROM_ADDRESS], 0, 4);
+
+ snprintf(name, sizeof(name), "%sresource", dir);
+
+ f = fopen(name, "r");
+ if (f == NULL) {
+ error_report("%s: %s: %m", __func__, name);
+ return 1;
+ }
+
+ for (r = 0; r < PCI_ROM_SLOT; r++) {
+ if (fscanf(f, "%" SCNi64 " %" SCNi64 " %" SCNi64 "\n",
+ &start, &end, &flags) != 3) {
+ break;
+ }
+
+ rp = dev->regions + r;
+ rp->valid = 0;
+ rp->resource_fd = -1;
+ size = end - start + 1;
+ flags &= IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH;
+ if (size == 0 || (flags & ~IORESOURCE_PREFETCH) == 0) {
+ continue;
+ }
+ if (flags & IORESOURCE_MEM) {
+ flags &= ~IORESOURCE_IO;
+ } else {
+ flags &= ~IORESOURCE_PREFETCH;
+ }
+ snprintf(name, sizeof(name), "%sresource%d", dir, r);
+ fd = open(name, O_RDWR);
+ if (fd == -1) {
+ continue;
+ }
+ rp->resource_fd = fd;
+
+ rp->type = flags;
+ rp->valid = 1;
+ rp->base_addr = start;
+ rp->size = size;
+ pci_dev->v_addrs[r].region = rp;
+ DEBUG("region %d size %" PRIu64 " start 0x%" PRIx64
+ " type %d resource_fd %d\n",
+ r, rp->size, start, rp->type, rp->resource_fd);
+ }
+
+ fclose(f);
+
+ /* read and fill vendor ID */
+ v = get_real_vendor_id(dir, &id);
+ if (v) {
+ return 1;
+ }
+ pci_dev->dev.config[0] = id & 0xff;
+ pci_dev->dev.config[1] = (id & 0xff00) >> 8;
+
+ /* read and fill device ID */
+ v = get_real_device_id(dir, &id);
+ if (v) {
+ return 1;
+ }
+ pci_dev->dev.config[2] = id & 0xff;
+ pci_dev->dev.config[3] = (id & 0xff00) >> 8;
+
+ pci_word_test_and_clear_mask(pci_dev->emulate_config_write + PCI_COMMAND,
+ PCI_COMMAND_MASTER | PCI_COMMAND_INTX_DISABLE);
+
+ dev->region_number = r;
+ return 0;
+}
+
+static void free_msi_virqs(AssignedDevice *dev)
+{
+ int i;
+
+ for (i = 0; i < dev->msi_virq_nr; i++) {
+ if (dev->msi_virq[i] >= 0) {
+ kvm_irqchip_release_virq(kvm_state, dev->msi_virq[i]);
+ dev->msi_virq[i] = -1;
+ }
+ }
+ g_free(dev->msi_virq);
+ dev->msi_virq = NULL;
+ dev->msi_virq_nr = 0;
+}
+
+static void free_assigned_device(AssignedDevice *dev)
+{
+ int i;
+
+ if (dev->cap.available & ASSIGNED_DEVICE_CAP_MSIX) {
+ assigned_dev_unregister_msix_mmio(dev);
+ }
+ for (i = 0; i < dev->real_device.region_number; i++) {
+ PCIRegion *pci_region = &dev->real_device.regions[i];
+ AssignedDevRegion *region = &dev->v_addrs[i];
+
+ if (!pci_region->valid) {
+ continue;
+ }
+ if (pci_region->type & IORESOURCE_IO) {
+ if (region->u.r_baseport) {
+ memory_region_del_subregion(&region->container,
+ &region->real_iomem);
+ memory_region_destroy(&region->real_iomem);
+ memory_region_destroy(&region->container);
+ }
+ } else if (pci_region->type & IORESOURCE_MEM) {
+ if (region->u.r_virtbase) {
+ memory_region_del_subregion(&region->container,
+ &region->real_iomem);
+
+ /* Remove MSI-X table subregion */
+ if (pci_region->base_addr <= dev->msix_table_addr &&
+ pci_region->base_addr + pci_region->size >
+ dev->msix_table_addr) {
+ memory_region_del_subregion(&region->container,
+ &dev->mmio);
+ }
+
+ memory_region_destroy(&region->real_iomem);
+ memory_region_destroy(&region->container);
+ if (munmap(region->u.r_virtbase,
+ (pci_region->size + 0xFFF) & 0xFFFFF000)) {
+ error_report("Failed to unmap assigned device region: %s",
+ strerror(errno));
+ }
+ }
+ }
+ if (pci_region->resource_fd >= 0) {
+ close(pci_region->resource_fd);
+ }
+ }
+
+ if (dev->real_device.config_fd >= 0) {
+ close(dev->real_device.config_fd);
+ }
+
+ free_msi_virqs(dev);
+}
+
+static void assign_failed_examine(AssignedDevice *dev)
+{
+ char name[PATH_MAX], dir[PATH_MAX], driver[PATH_MAX] = {}, *ns;
+ uint16_t vendor_id, device_id;
+ int r;
+
+ snprintf(dir, sizeof(dir), "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/",
+ dev->host.domain, dev->host.bus, dev->host.slot,
+ dev->host.function);
+
+ snprintf(name, sizeof(name), "%sdriver", dir);
+
+ r = readlink(name, driver, sizeof(driver));
+ if ((r <= 0) || r >= sizeof(driver)) {
+ goto fail;
+ }
+
+ ns = strrchr(driver, '/');
+ if (!ns) {
+ goto fail;
+ }
+
+ ns++;
+
+ if (get_real_vendor_id(dir, &vendor_id) ||
+ get_real_device_id(dir, &device_id)) {
+ goto fail;
+ }
+
+ error_report("*** The driver '%s' is occupying your device "
+ "%04x:%02x:%02x.%x.",
+ ns, dev->host.domain, dev->host.bus, dev->host.slot,
+ dev->host.function);
+ error_report("***");
+ error_report("*** You can try the following commands to free it:");
+ error_report("***");
+ error_report("*** $ echo \"%04x %04x\" > /sys/bus/pci/drivers/pci-stub/"
+ "new_id", vendor_id, device_id);
+ error_report("*** $ echo \"%04x:%02x:%02x.%x\" > /sys/bus/pci/drivers/"
+ "%s/unbind",
+ dev->host.domain, dev->host.bus, dev->host.slot,
+ dev->host.function, ns);
+ error_report("*** $ echo \"%04x:%02x:%02x.%x\" > /sys/bus/pci/drivers/"
+ "pci-stub/bind",
+ dev->host.domain, dev->host.bus, dev->host.slot,
+ dev->host.function);
+ error_report("*** $ echo \"%04x %04x\" > /sys/bus/pci/drivers/pci-stub"
+ "/remove_id", vendor_id, device_id);
+ error_report("***");
+
+ return;
+
+fail:
+ error_report("Couldn't find out why.");
+}
+
+static int assign_device(AssignedDevice *dev)
+{
+ uint32_t flags = KVM_DEV_ASSIGN_ENABLE_IOMMU;
+ int r;
+
+ /* Only pass non-zero PCI segment to capable module */
+ if (!kvm_check_extension(kvm_state, KVM_CAP_PCI_SEGMENT) &&
+ dev->host.domain) {
+ error_report("Can't assign device inside non-zero PCI segment "
+ "as this KVM module doesn't support it.");
+ return -ENODEV;
+ }
+
+ if (!kvm_check_extension(kvm_state, KVM_CAP_IOMMU)) {
+ error_report("No IOMMU found. Unable to assign device \"%s\"",
+ dev->dev.qdev.id);
+ return -ENODEV;
+ }
+
+ if (dev->features & ASSIGNED_DEVICE_SHARE_INTX_MASK &&
+ kvm_has_intx_set_mask()) {
+ flags |= KVM_DEV_ASSIGN_PCI_2_3;
+ }
+
+ r = kvm_device_pci_assign(kvm_state, &dev->host, flags, &dev->dev_id);
+ if (r < 0) {
+ error_report("Failed to assign device \"%s\" : %s",
+ dev->dev.qdev.id, strerror(-r));
+
+ switch (r) {
+ case -EBUSY:
+ assign_failed_examine(dev);
+ break;
+ default:
+ break;
+ }
+ }
+ return r;
+}
+
+static bool check_irqchip_in_kernel(void)
+{
+ if (kvm_irqchip_in_kernel()) {
+ return true;
+ }
+ error_report("pci-assign: error: requires KVM with in-kernel irqchip "
+ "enabled");
+ return false;
+}
+
+static int assign_intx(AssignedDevice *dev)
+{
+ AssignedIRQType new_type;
+ PCIINTxRoute intx_route;
+ bool intx_host_msi;
+ int r;
+
+ /* Interrupt PIN 0 means don't use INTx */
+ if (assigned_dev_pci_read_byte(&dev->dev, PCI_INTERRUPT_PIN) == 0) {
+ pci_device_set_intx_routing_notifier(&dev->dev, NULL);
+ return 0;
+ }
+
+ if (!check_irqchip_in_kernel()) {
+ return -ENOTSUP;
+ }
+
+ pci_device_set_intx_routing_notifier(&dev->dev,
+ assigned_dev_update_irq_routing);
+
+ intx_route = pci_device_route_intx_to_irq(&dev->dev, dev->intpin);
+ assert(intx_route.mode != PCI_INTX_INVERTED);
+
+ if (dev->intx_route.mode == intx_route.mode &&
+ dev->intx_route.irq == intx_route.irq) {
+ return 0;
+ }
+
+ switch (dev->assigned_irq_type) {
+ case ASSIGNED_IRQ_INTX_HOST_INTX:
+ case ASSIGNED_IRQ_INTX_HOST_MSI:
+ intx_host_msi = dev->assigned_irq_type == ASSIGNED_IRQ_INTX_HOST_MSI;
+ r = kvm_device_intx_deassign(kvm_state, dev->dev_id, intx_host_msi);
+ break;
+ case ASSIGNED_IRQ_MSI:
+ r = kvm_device_msi_deassign(kvm_state, dev->dev_id);
+ break;
+ case ASSIGNED_IRQ_MSIX:
+ r = kvm_device_msix_deassign(kvm_state, dev->dev_id);
+ break;
+ default:
+ r = 0;
+ break;
+ }
+ if (r) {
+ perror("assign_intx: deassignment of previous interrupt failed");
+ }
+ dev->assigned_irq_type = ASSIGNED_IRQ_NONE;
+
+ if (intx_route.mode == PCI_INTX_DISABLED) {
+ dev->intx_route = intx_route;
+ return 0;
+ }
+
+retry:
+ if (dev->features & ASSIGNED_DEVICE_PREFER_MSI_MASK &&
+ dev->cap.available & ASSIGNED_DEVICE_CAP_MSI) {
+ intx_host_msi = true;
+ new_type = ASSIGNED_IRQ_INTX_HOST_MSI;
+ } else {
+ intx_host_msi = false;
+ new_type = ASSIGNED_IRQ_INTX_HOST_INTX;
+ }
+
+ r = kvm_device_intx_assign(kvm_state, dev->dev_id, intx_host_msi,
+ intx_route.irq);
+ if (r < 0) {
+ if (r == -EIO && !(dev->features & ASSIGNED_DEVICE_PREFER_MSI_MASK) &&
+ dev->cap.available & ASSIGNED_DEVICE_CAP_MSI) {
+ /* Retry with host-side MSI. There might be an IRQ conflict and
+ * either the kernel or the device doesn't support sharing. */
+ error_report("Host-side INTx sharing not supported, "
+ "using MSI instead.\n"
+ "Some devices do not to work properly in this mode.");
+ dev->features |= ASSIGNED_DEVICE_PREFER_MSI_MASK;
+ goto retry;
+ }
+ error_report("Failed to assign irq for \"%s\": %s",
+ dev->dev.qdev.id, strerror(-r));
+ error_report("Perhaps you are assigning a device "
+ "that shares an IRQ with another device?");
+ return r;
+ }
+
+ dev->intx_route = intx_route;
+ dev->assigned_irq_type = new_type;
+ return r;
+}
+
+static void deassign_device(AssignedDevice *dev)
+{
+ int r;
+
+ r = kvm_device_pci_deassign(kvm_state, dev->dev_id);
+ assert(r == 0);
+}
+
+/* The pci config space got updated. Check if irq numbers have changed
+ * for our devices
+ */
+static void assigned_dev_update_irq_routing(PCIDevice *dev)
+{
+ AssignedDevice *assigned_dev = DO_UPCAST(AssignedDevice, dev, dev);
+ Error *err = NULL;
+ int r;
+
+ r = assign_intx(assigned_dev);
+ if (r < 0) {
+ qdev_unplug(&dev->qdev, &err);
+ assert(!err);
+ }
+}
+
+static void assigned_dev_update_msi(PCIDevice *pci_dev)
+{
+ AssignedDevice *assigned_dev = DO_UPCAST(AssignedDevice, dev, pci_dev);
+ uint8_t ctrl_byte = pci_get_byte(pci_dev->config + pci_dev->msi_cap +
+ PCI_MSI_FLAGS);
+ int r;
+
+ /* Some guests gratuitously disable MSI even if they're not using it,
+ * try to catch this by only deassigning irqs if the guest is using
+ * MSI or intends to start. */
+ if (assigned_dev->assigned_irq_type == ASSIGNED_IRQ_MSI ||
+ (ctrl_byte & PCI_MSI_FLAGS_ENABLE)) {
+ r = kvm_device_msi_deassign(kvm_state, assigned_dev->dev_id);
+ /* -ENXIO means no assigned irq */
+ if (r && r != -ENXIO) {
+ perror("assigned_dev_update_msi: deassign irq");
+ }
+
+ free_msi_virqs(assigned_dev);
+
+ assigned_dev->assigned_irq_type = ASSIGNED_IRQ_NONE;
+ pci_device_set_intx_routing_notifier(pci_dev, NULL);
+ }
+
+ if (ctrl_byte & PCI_MSI_FLAGS_ENABLE) {
+ uint8_t *pos = pci_dev->config + pci_dev->msi_cap;
+ MSIMessage msg;
+ int virq;
+
+ msg.address = pci_get_long(pos + PCI_MSI_ADDRESS_LO);
+ msg.data = pci_get_word(pos + PCI_MSI_DATA_32);
+ virq = kvm_irqchip_add_msi_route(kvm_state, msg);
+ if (virq < 0) {
+ perror("assigned_dev_update_msi: kvm_irqchip_add_msi_route");
+ return;
+ }
+
+ assigned_dev->msi_virq = g_malloc(sizeof(*assigned_dev->msi_virq));
+ assigned_dev->msi_virq_nr = 1;
+ assigned_dev->msi_virq[0] = virq;
+ if (kvm_device_msi_assign(kvm_state, assigned_dev->dev_id, virq) < 0) {
+ perror("assigned_dev_update_msi: kvm_device_msi_assign");
+ }
+
+ assigned_dev->intx_route.mode = PCI_INTX_DISABLED;
+ assigned_dev->intx_route.irq = -1;
+ assigned_dev->assigned_irq_type = ASSIGNED_IRQ_MSI;
+ } else {
+ assign_intx(assigned_dev);
+ }
+}
+
+static bool assigned_dev_msix_masked(MSIXTableEntry *entry)
+{
+ return (entry->ctrl & cpu_to_le32(0x1)) != 0;
+}
+
+static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev)
+{
+ AssignedDevice *adev = DO_UPCAST(AssignedDevice, dev, pci_dev);
+ uint16_t entries_nr = 0;
+ int i, r = 0;
+ MSIXTableEntry *entry = adev->msix_table;
+ MSIMessage msg;
+
+ /* Get the usable entry number for allocating */
+ for (i = 0; i < adev->msix_max; i++, entry++) {
+ if (assigned_dev_msix_masked(entry)) {
+ continue;
+ }
+ entries_nr++;
+ }
+
+ DEBUG("MSI-X entries: %d\n", entries_nr);
+
+ /* It's valid to enable MSI-X with all entries masked */
+ if (!entries_nr) {
+ return 0;
+ }
+
+ r = kvm_device_msix_init_vectors(kvm_state, adev->dev_id, entries_nr);
+ if (r != 0) {
+ error_report("fail to set MSI-X entry number for MSIX! %s",
+ strerror(-r));
+ return r;
+ }
+
+ free_msi_virqs(adev);
+
+ adev->msi_virq_nr = adev->msix_max;
+ adev->msi_virq = g_malloc(adev->msix_max * sizeof(*adev->msi_virq));
+
+ entry = adev->msix_table;
+ for (i = 0; i < adev->msix_max; i++, entry++) {
+ adev->msi_virq[i] = -1;
+
+ if (assigned_dev_msix_masked(entry)) {
+ continue;
+ }
+
+ msg.address = entry->addr_lo | ((uint64_t)entry->addr_hi << 32);
+ msg.data = entry->data;
+ r = kvm_irqchip_add_msi_route(kvm_state, msg);
+ if (r < 0) {
+ return r;
+ }
+ adev->msi_virq[i] = r;
+
+ DEBUG("MSI-X vector %d, gsi %d, addr %08x_%08x, data %08x\n", i,
+ r, entry->addr_hi, entry->addr_lo, entry->data);
+
+ r = kvm_device_msix_set_vector(kvm_state, adev->dev_id, i,
+ adev->msi_virq[i]);
+ if (r) {
+ error_report("fail to set MSI-X entry! %s", strerror(-r));
+ break;
+ }
+ }
+
+ return r;
+}
+
+static void assigned_dev_update_msix(PCIDevice *pci_dev)
+{
+ AssignedDevice *assigned_dev = DO_UPCAST(AssignedDevice, dev, pci_dev);
+ uint16_t ctrl_word = pci_get_word(pci_dev->config + pci_dev->msix_cap +
+ PCI_MSIX_FLAGS);
+ int r;
+
+ /* Some guests gratuitously disable MSIX even if they're not using it,
+ * try to catch this by only deassigning irqs if the guest is using
+ * MSIX or intends to start. */
+ if ((assigned_dev->assigned_irq_type == ASSIGNED_IRQ_MSIX) ||
+ (ctrl_word & PCI_MSIX_FLAGS_ENABLE)) {
+ r = kvm_device_msix_deassign(kvm_state, assigned_dev->dev_id);
+ /* -ENXIO means no assigned irq */
+ if (r && r != -ENXIO) {
+ perror("assigned_dev_update_msix: deassign irq");
+ }
+
+ free_msi_virqs(assigned_dev);
+
+ assigned_dev->assigned_irq_type = ASSIGNED_IRQ_NONE;
+ pci_device_set_intx_routing_notifier(pci_dev, NULL);
+ }
+
+ if (ctrl_word & PCI_MSIX_FLAGS_ENABLE) {
+ if (assigned_dev_update_msix_mmio(pci_dev) < 0) {
+ perror("assigned_dev_update_msix_mmio");
+ return;
+ }
+
+ if (assigned_dev->msi_virq_nr > 0) {
+ if (kvm_device_msix_assign(kvm_state, assigned_dev->dev_id) < 0) {
+ perror("assigned_dev_enable_msix: assign irq");
+ return;
+ }
+ }
+ assigned_dev->intx_route.mode = PCI_INTX_DISABLED;
+ assigned_dev->intx_route.irq = -1;
+ assigned_dev->assigned_irq_type = ASSIGNED_IRQ_MSIX;
+ } else {
+ assign_intx(assigned_dev);
+ }
+}
+
+static uint32_t assigned_dev_pci_read_config(PCIDevice *pci_dev,
+ uint32_t address, int len)
+{
+ AssignedDevice *assigned_dev = DO_UPCAST(AssignedDevice, dev, pci_dev);
+ uint32_t virt_val = pci_default_read_config(pci_dev, address, len);
+ uint32_t real_val, emulate_mask, full_emulation_mask;
+
+ emulate_mask = 0;
+ memcpy(&emulate_mask, assigned_dev->emulate_config_read + address, len);
+ emulate_mask = le32_to_cpu(emulate_mask);
+
+ full_emulation_mask = 0xffffffff >> (32 - len * 8);
+
+ if (emulate_mask != full_emulation_mask) {
+ real_val = assigned_dev_pci_read(pci_dev, address, len);
+ return (virt_val & emulate_mask) | (real_val & ~emulate_mask);
+ } else {
+ return virt_val;
+ }
+}
+
+static void assigned_dev_pci_write_config(PCIDevice *pci_dev, uint32_t address,
+ uint32_t val, int len)
+{
+ AssignedDevice *assigned_dev = DO_UPCAST(AssignedDevice, dev, pci_dev);
+ uint16_t old_cmd = pci_get_word(pci_dev->config + PCI_COMMAND);
+ uint32_t emulate_mask, full_emulation_mask;
+ int ret;
+
+ pci_default_write_config(pci_dev, address, val, len);
+
+ if (kvm_has_intx_set_mask() &&
+ range_covers_byte(address, len, PCI_COMMAND + 1)) {
+ bool intx_masked = (pci_get_word(pci_dev->config + PCI_COMMAND) &
+ PCI_COMMAND_INTX_DISABLE);
+
+ if (intx_masked != !!(old_cmd & PCI_COMMAND_INTX_DISABLE)) {
+ ret = kvm_device_intx_set_mask(kvm_state, assigned_dev->dev_id,
+ intx_masked);
+ if (ret) {
+ perror("assigned_dev_pci_write_config: set intx mask");
+ }
+ }
+ }
+ if (assigned_dev->cap.available & ASSIGNED_DEVICE_CAP_MSI) {
+ if (range_covers_byte(address, len,
+ pci_dev->msi_cap + PCI_MSI_FLAGS)) {
+ assigned_dev_update_msi(pci_dev);
+ }
+ }
+ if (assigned_dev->cap.available & ASSIGNED_DEVICE_CAP_MSIX) {
+ if (range_covers_byte(address, len,
+ pci_dev->msix_cap + PCI_MSIX_FLAGS + 1)) {
+ assigned_dev_update_msix(pci_dev);
+ }
+ }
+
+ emulate_mask = 0;
+ memcpy(&emulate_mask, assigned_dev->emulate_config_write + address, len);
+ emulate_mask = le32_to_cpu(emulate_mask);
+
+ full_emulation_mask = 0xffffffff >> (32 - len * 8);
+
+ if (emulate_mask != full_emulation_mask) {
+ if (emulate_mask) {
+ val &= ~emulate_mask;
+ val |= assigned_dev_pci_read(pci_dev, address, len) & emulate_mask;
+ }
+ assigned_dev_pci_write(pci_dev, address, val, len);
+ }
+}
+
+static void assigned_dev_setup_cap_read(AssignedDevice *dev, uint32_t offset,
+ uint32_t len)
+{
+ assigned_dev_direct_config_read(dev, offset, len);
+ assigned_dev_emulate_config_read(dev, offset + PCI_CAP_LIST_NEXT, 1);
+}
+
+static int assigned_device_pci_cap_init(PCIDevice *pci_dev)
+{
+ AssignedDevice *dev = DO_UPCAST(AssignedDevice, dev, pci_dev);
+ PCIRegion *pci_region = dev->real_device.regions;
+ int ret, pos;
+
+ /* Clear initial capabilities pointer and status copied from hw */
+ pci_set_byte(pci_dev->config + PCI_CAPABILITY_LIST, 0);
+ pci_set_word(pci_dev->config + PCI_STATUS,
+ pci_get_word(pci_dev->config + PCI_STATUS) &
+ ~PCI_STATUS_CAP_LIST);
+
+ /* Expose MSI capability
+ * MSI capability is the 1st capability in capability config */
+ pos = pci_find_cap_offset(pci_dev, PCI_CAP_ID_MSI, 0);
+ if (pos != 0 && kvm_check_extension(kvm_state, KVM_CAP_ASSIGN_DEV_IRQ)) {
+ if (!check_irqchip_in_kernel()) {
+ return -ENOTSUP;
+ }
+ dev->cap.available |= ASSIGNED_DEVICE_CAP_MSI;
+ /* Only 32-bit/no-mask currently supported */
+ ret = pci_add_capability(pci_dev, PCI_CAP_ID_MSI, pos, 10);
+ if (ret < 0) {
+ return ret;
+ }
+ pci_dev->msi_cap = pos;
+
+ pci_set_word(pci_dev->config + pos + PCI_MSI_FLAGS,
+ pci_get_word(pci_dev->config + pos + PCI_MSI_FLAGS) &
+ PCI_MSI_FLAGS_QMASK);
+ pci_set_long(pci_dev->config + pos + PCI_MSI_ADDRESS_LO, 0);
+ pci_set_word(pci_dev->config + pos + PCI_MSI_DATA_32, 0);
+
+ /* Set writable fields */
+ pci_set_word(pci_dev->wmask + pos + PCI_MSI_FLAGS,
+ PCI_MSI_FLAGS_QSIZE | PCI_MSI_FLAGS_ENABLE);
+ pci_set_long(pci_dev->wmask + pos + PCI_MSI_ADDRESS_LO, 0xfffffffc);
+ pci_set_word(pci_dev->wmask + pos + PCI_MSI_DATA_32, 0xffff);
+ }
+ /* Expose MSI-X capability */
+ pos = pci_find_cap_offset(pci_dev, PCI_CAP_ID_MSIX, 0);
+ if (pos != 0 && kvm_device_msix_supported(kvm_state)) {
+ int bar_nr;
+ uint32_t msix_table_entry;
+
+ if (!check_irqchip_in_kernel()) {
+ return -ENOTSUP;
+ }
+ dev->cap.available |= ASSIGNED_DEVICE_CAP_MSIX;
+ ret = pci_add_capability(pci_dev, PCI_CAP_ID_MSIX, pos, 12);
+ if (ret < 0) {
+ return ret;
+ }
+ pci_dev->msix_cap = pos;
+
+ pci_set_word(pci_dev->config + pos + PCI_MSIX_FLAGS,
+ pci_get_word(pci_dev->config + pos + PCI_MSIX_FLAGS) &
+ PCI_MSIX_FLAGS_QSIZE);
+
+ /* Only enable and function mask bits are writable */
+ pci_set_word(pci_dev->wmask + pos + PCI_MSIX_FLAGS,
+ PCI_MSIX_FLAGS_ENABLE | PCI_MSIX_FLAGS_MASKALL);
+
+ msix_table_entry = pci_get_long(pci_dev->config + pos + PCI_MSIX_TABLE);
+ bar_nr = msix_table_entry & PCI_MSIX_FLAGS_BIRMASK;
+ msix_table_entry &= ~PCI_MSIX_FLAGS_BIRMASK;
+ dev->msix_table_addr = pci_region[bar_nr].base_addr + msix_table_entry;
+ dev->msix_max = pci_get_word(pci_dev->config + pos + PCI_MSIX_FLAGS);
+ dev->msix_max &= PCI_MSIX_FLAGS_QSIZE;
+ dev->msix_max += 1;
+ }
+
+ /* Minimal PM support, nothing writable, device appears to NAK changes */
+ pos = pci_find_cap_offset(pci_dev, PCI_CAP_ID_PM, 0);
+ if (pos) {
+ uint16_t pmc;
+
+ ret = pci_add_capability(pci_dev, PCI_CAP_ID_PM, pos, PCI_PM_SIZEOF);
+ if (ret < 0) {
+ return ret;
+ }
+
+ assigned_dev_setup_cap_read(dev, pos, PCI_PM_SIZEOF);
+
+ pmc = pci_get_word(pci_dev->config + pos + PCI_CAP_FLAGS);
+ pmc &= (PCI_PM_CAP_VER_MASK | PCI_PM_CAP_DSI);
+ pci_set_word(pci_dev->config + pos + PCI_CAP_FLAGS, pmc);
+
+ /* assign_device will bring the device up to D0, so we don't need
+ * to worry about doing that ourselves here. */
+ pci_set_word(pci_dev->config + pos + PCI_PM_CTRL,
+ PCI_PM_CTRL_NO_SOFT_RESET);
+
+ pci_set_byte(pci_dev->config + pos + PCI_PM_PPB_EXTENSIONS, 0);
+ pci_set_byte(pci_dev->config + pos + PCI_PM_DATA_REGISTER, 0);
+ }
+
+ pos = pci_find_cap_offset(pci_dev, PCI_CAP_ID_EXP, 0);
+ if (pos) {
+ uint8_t version, size = 0;
+ uint16_t type, devctl, lnksta;
+ uint32_t devcap, lnkcap;
+
+ version = pci_get_byte(pci_dev->config + pos + PCI_EXP_FLAGS);
+ version &= PCI_EXP_FLAGS_VERS;
+ if (version == 1) {
+ size = 0x14;
+ } else if (version == 2) {
+ /*
+ * Check for non-std size, accept reduced size to 0x34,
+ * which is what bcm5761 implemented, violating the
+ * PCIe v3.0 spec that regs should exist and be read as 0,
+ * not optionally provided and shorten the struct size.
+ */
+ size = MIN(0x3c, PCI_CONFIG_SPACE_SIZE - pos);
+ if (size < 0x34) {
+ error_report("%s: Invalid size PCIe cap-id 0x%x",
+ __func__, PCI_CAP_ID_EXP);
+ return -EINVAL;
+ } else if (size != 0x3c) {
+ error_report("WARNING, %s: PCIe cap-id 0x%x has "
+ "non-standard size 0x%x; std size should be 0x3c",
+ __func__, PCI_CAP_ID_EXP, size);
+ }
+ } else if (version == 0) {
+ uint16_t vid, did;
+ vid = pci_get_word(pci_dev->config + PCI_VENDOR_ID);
+ did = pci_get_word(pci_dev->config + PCI_DEVICE_ID);
+ if (vid == PCI_VENDOR_ID_INTEL && did == 0x10ed) {
+ /*
+ * quirk for Intel 82599 VF with invalid PCIe capability
+ * version, should really be version 2 (same as PF)
+ */
+ size = 0x3c;
+ }
+ }
+
+ if (size == 0) {
+ error_report("%s: Unsupported PCI express capability version %d",
+ __func__, version);
+ return -EINVAL;
+ }
+
+ ret = pci_add_capability(pci_dev, PCI_CAP_ID_EXP, pos, size);
+ if (ret < 0) {
+ return ret;
+ }
+
+ assigned_dev_setup_cap_read(dev, pos, size);
+
+ type = pci_get_word(pci_dev->config + pos + PCI_EXP_FLAGS);
+ type = (type & PCI_EXP_FLAGS_TYPE) >> 4;
+ if (type != PCI_EXP_TYPE_ENDPOINT &&
+ type != PCI_EXP_TYPE_LEG_END && type != PCI_EXP_TYPE_RC_END) {
+ error_report("Device assignment only supports endpoint assignment,"
+ " device type %d", type);
+ return -EINVAL;
+ }
+
+ /* capabilities, pass existing read-only copy
+ * PCI_EXP_FLAGS_IRQ: updated by hardware, should be direct read */
+
+ /* device capabilities: hide FLR */
+ devcap = pci_get_long(pci_dev->config + pos + PCI_EXP_DEVCAP);
+ devcap &= ~PCI_EXP_DEVCAP_FLR;
+ pci_set_long(pci_dev->config + pos + PCI_EXP_DEVCAP, devcap);
+
+ /* device control: clear all error reporting enable bits, leaving
+ * only a few host values. Note, these are
+ * all writable, but not passed to hw.
+ */
+ devctl = pci_get_word(pci_dev->config + pos + PCI_EXP_DEVCTL);
+ devctl = (devctl & (PCI_EXP_DEVCTL_READRQ | PCI_EXP_DEVCTL_PAYLOAD)) |
+ PCI_EXP_DEVCTL_RELAX_EN | PCI_EXP_DEVCTL_NOSNOOP_EN;
+ pci_set_word(pci_dev->config + pos + PCI_EXP_DEVCTL, devctl);
+ devctl = PCI_EXP_DEVCTL_BCR_FLR | PCI_EXP_DEVCTL_AUX_PME;
+ pci_set_word(pci_dev->wmask + pos + PCI_EXP_DEVCTL, ~devctl);
+
+ /* Clear device status */
+ pci_set_word(pci_dev->config + pos + PCI_EXP_DEVSTA, 0);
+
+ /* Link capabilities, expose links and latencues, clear reporting */
+ lnkcap = pci_get_long(pci_dev->config + pos + PCI_EXP_LNKCAP);
+ lnkcap &= (PCI_EXP_LNKCAP_SLS | PCI_EXP_LNKCAP_MLW |
+ PCI_EXP_LNKCAP_ASPMS | PCI_EXP_LNKCAP_L0SEL |
+ PCI_EXP_LNKCAP_L1EL);
+ pci_set_long(pci_dev->config + pos + PCI_EXP_LNKCAP, lnkcap);
+
+ /* Link control, pass existing read-only copy. Should be writable? */
+
+ /* Link status, only expose current speed and width */
+ lnksta = pci_get_word(pci_dev->config + pos + PCI_EXP_LNKSTA);
+ lnksta &= (PCI_EXP_LNKSTA_CLS | PCI_EXP_LNKSTA_NLW);
+ pci_set_word(pci_dev->config + pos + PCI_EXP_LNKSTA, lnksta);
+
+ if (version >= 2) {
+ /* Slot capabilities, control, status - not needed for endpoints */
+ pci_set_long(pci_dev->config + pos + PCI_EXP_SLTCAP, 0);
+ pci_set_word(pci_dev->config + pos + PCI_EXP_SLTCTL, 0);
+ pci_set_word(pci_dev->config + pos + PCI_EXP_SLTSTA, 0);
+
+ /* Root control, capabilities, status - not needed for endpoints */
+ pci_set_word(pci_dev->config + pos + PCI_EXP_RTCTL, 0);
+ pci_set_word(pci_dev->config + pos + PCI_EXP_RTCAP, 0);
+ pci_set_long(pci_dev->config + pos + PCI_EXP_RTSTA, 0);
+
+ /* Device capabilities/control 2, pass existing read-only copy */
+ /* Link control 2, pass existing read-only copy */
+ }
+ }
+
+ pos = pci_find_cap_offset(pci_dev, PCI_CAP_ID_PCIX, 0);
+ if (pos) {
+ uint16_t cmd;
+ uint32_t status;
+
+ /* Only expose the minimum, 8 byte capability */
+ ret = pci_add_capability(pci_dev, PCI_CAP_ID_PCIX, pos, 8);
+ if (ret < 0) {
+ return ret;
+ }
+
+ assigned_dev_setup_cap_read(dev, pos, 8);
+
+ /* Command register, clear upper bits, including extended modes */
+ cmd = pci_get_word(pci_dev->config + pos + PCI_X_CMD);
+ cmd &= (PCI_X_CMD_DPERR_E | PCI_X_CMD_ERO | PCI_X_CMD_MAX_READ |
+ PCI_X_CMD_MAX_SPLIT);
+ pci_set_word(pci_dev->config + pos + PCI_X_CMD, cmd);
+
+ /* Status register, update with emulated PCI bus location, clear
+ * error bits, leave the rest. */
+ status = pci_get_long(pci_dev->config + pos + PCI_X_STATUS);
+ status &= ~(PCI_X_STATUS_BUS | PCI_X_STATUS_DEVFN);
+ status |= (pci_bus_num(pci_dev->bus) << 8) | pci_dev->devfn;
+ status &= ~(PCI_X_STATUS_SPL_DISC | PCI_X_STATUS_UNX_SPL |
+ PCI_X_STATUS_SPL_ERR);
+ pci_set_long(pci_dev->config + pos + PCI_X_STATUS, status);
+ }
+
+ pos = pci_find_cap_offset(pci_dev, PCI_CAP_ID_VPD, 0);
+ if (pos) {
+ /* Direct R/W passthrough */
+ ret = pci_add_capability(pci_dev, PCI_CAP_ID_VPD, pos, 8);
+ if (ret < 0) {
+ return ret;
+ }
+
+ assigned_dev_setup_cap_read(dev, pos, 8);
+
+ /* direct write for cap content */
+ assigned_dev_direct_config_write(dev, pos + 2, 6);
+ }
+
+ /* Devices can have multiple vendor capabilities, get them all */
+ for (pos = 0; (pos = pci_find_cap_offset(pci_dev, PCI_CAP_ID_VNDR, pos));
+ pos += PCI_CAP_LIST_NEXT) {
+ uint8_t len = pci_get_byte(pci_dev->config + pos + PCI_CAP_FLAGS);
+ /* Direct R/W passthrough */
+ ret = pci_add_capability(pci_dev, PCI_CAP_ID_VNDR, pos, len);
+ if (ret < 0) {
+ return ret;
+ }
+
+ assigned_dev_setup_cap_read(dev, pos, len);
+
+ /* direct write for cap content */
+ assigned_dev_direct_config_write(dev, pos + 2, len - 2);
+ }
+
+ /* If real and virtual capability list status bits differ, virtualize the
+ * access. */
+ if ((pci_get_word(pci_dev->config + PCI_STATUS) & PCI_STATUS_CAP_LIST) !=
+ (assigned_dev_pci_read_byte(pci_dev, PCI_STATUS) &
+ PCI_STATUS_CAP_LIST)) {
+ dev->emulate_config_read[PCI_STATUS] |= PCI_STATUS_CAP_LIST;
+ }
+
+ return 0;
+}
+
+static uint64_t
+assigned_dev_msix_mmio_read(void *opaque, target_phys_addr_t addr,
+ unsigned size)
+{
+ AssignedDevice *adev = opaque;
+ uint64_t val;
+
+ memcpy(&val, (void *)((uint8_t *)adev->msix_table + addr), size);
+
+ return val;
+}
+
+static void assigned_dev_msix_mmio_write(void *opaque, target_phys_addr_t addr,
+ uint64_t val, unsigned size)
+{
+ AssignedDevice *adev = opaque;
+ PCIDevice *pdev = &adev->dev;
+ uint16_t ctrl;
+ MSIXTableEntry orig;
+ int i = addr >> 4;
+
+ if (i >= adev->msix_max) {
+ return; /* Drop write */
+ }
+
+ ctrl = pci_get_word(pdev->config + pdev->msix_cap + PCI_MSIX_FLAGS);
+
+ DEBUG("write to MSI-X table offset 0x%lx, val 0x%lx\n", addr, val);
+
+ if (ctrl & PCI_MSIX_FLAGS_ENABLE) {
+ orig = adev->msix_table[i];
+ }
+
+ memcpy((uint8_t *)adev->msix_table + addr, &val, size);
+
+ if (ctrl & PCI_MSIX_FLAGS_ENABLE) {
+ MSIXTableEntry *entry = &adev->msix_table[i];
+
+ if (!assigned_dev_msix_masked(&orig) &&
+ assigned_dev_msix_masked(entry)) {
+ /*
+ * Vector masked, disable it
+ *
+ * XXX It's not clear if we can or should actually attempt
+ * to mask or disable the interrupt. KVM doesn't have
+ * support for pending bits and kvm_assign_set_msix_entry
+ * doesn't modify the device hardware mask. Interrupts
+ * while masked are simply not injected to the guest, so
+ * are lost. Can we get away with always injecting an
+ * interrupt on unmask?
+ */
+ } else if (assigned_dev_msix_masked(&orig) &&
+ !assigned_dev_msix_masked(entry)) {
+ /* Vector unmasked */
+ if (i >= adev->msi_virq_nr || adev->msi_virq[i] < 0) {
+ /* Previously unassigned vector, start from scratch */
+ assigned_dev_update_msix(pdev);
+ return;
+ } else {
+ /* Update an existing, previously masked vector */
+ MSIMessage msg;
+ int ret;
+
+ msg.address = entry->addr_lo |
+ ((uint64_t)entry->addr_hi << 32);
+ msg.data = entry->data;
+
+ ret = kvm_irqchip_update_msi_route(kvm_state,
+ adev->msi_virq[i], msg);
+ if (ret) {
+ error_report("Error updating irq routing entry (%d)", ret);
+ }
+ }
+ }
+ }
+}
+
+static const MemoryRegionOps assigned_dev_msix_mmio_ops = {
+ .read = assigned_dev_msix_mmio_read,
+ .write = assigned_dev_msix_mmio_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+ .valid = {
+ .min_access_size = 4,
+ .max_access_size = 8,
+ },
+ .impl = {
+ .min_access_size = 4,
+ .max_access_size = 8,
+ },
+};
+
+static void assigned_dev_msix_reset(AssignedDevice *dev)
+{
+ MSIXTableEntry *entry;
+ int i;
+
+ if (!dev->msix_table) {
+ return;
+ }
+
+ memset(dev->msix_table, 0, MSIX_PAGE_SIZE);
+
+ for (i = 0, entry = dev->msix_table; i < dev->msix_max; i++, entry++) {
+ entry->ctrl = cpu_to_le32(0x1); /* Masked */
+ }
+}
+
+static int assigned_dev_register_msix_mmio(AssignedDevice *dev)
+{
+ dev->msix_table = mmap(NULL, MSIX_PAGE_SIZE, PROT_READ|PROT_WRITE,
+ MAP_ANONYMOUS|MAP_PRIVATE, 0, 0);
+ if (dev->msix_table == MAP_FAILED) {
+ error_report("fail allocate msix_table! %s", strerror(errno));
+ return -EFAULT;
+ }
+
+ assigned_dev_msix_reset(dev);
+
+ memory_region_init_io(&dev->mmio, &assigned_dev_msix_mmio_ops, dev,
+ "assigned-dev-msix", MSIX_PAGE_SIZE);
+ return 0;
+}
+
+static void assigned_dev_unregister_msix_mmio(AssignedDevice *dev)
+{
+ if (!dev->msix_table) {
+ return;
+ }
+
+ memory_region_destroy(&dev->mmio);
+
+ if (munmap(dev->msix_table, MSIX_PAGE_SIZE) == -1) {
+ error_report("error unmapping msix_table! %s", strerror(errno));
+ }
+ dev->msix_table = NULL;
+}
+
+static const VMStateDescription vmstate_assigned_device = {
+ .name = "pci-assign",
+ .unmigratable = 1,
+};
+
+static void reset_assigned_device(DeviceState *dev)
+{
+ PCIDevice *pci_dev = DO_UPCAST(PCIDevice, qdev, dev);
+ AssignedDevice *adev = DO_UPCAST(AssignedDevice, dev, pci_dev);
+ char reset_file[64];
+ const char reset[] = "1";
+ int fd, ret;
+
+ /*
+ * If a guest is reset without being shutdown, MSI/MSI-X can still
+ * be running. We want to return the device to a known state on
+ * reset, so disable those here. We especially do not want MSI-X
+ * enabled since it lives in MMIO space, which is about to get
+ * disabled.
+ */
+ if (adev->assigned_irq_type == ASSIGNED_IRQ_MSIX) {
+ uint16_t ctrl = pci_get_word(pci_dev->config +
+ pci_dev->msix_cap + PCI_MSIX_FLAGS);
+
+ pci_set_word(pci_dev->config + pci_dev->msix_cap + PCI_MSIX_FLAGS,
+ ctrl & ~PCI_MSIX_FLAGS_ENABLE);
+ assigned_dev_update_msix(pci_dev);
+ } else if (adev->assigned_irq_type == ASSIGNED_IRQ_MSI) {
+ uint8_t ctrl = pci_get_byte(pci_dev->config +
+ pci_dev->msi_cap + PCI_MSI_FLAGS);
+
+ pci_set_byte(pci_dev->config + pci_dev->msi_cap + PCI_MSI_FLAGS,
+ ctrl & ~PCI_MSI_FLAGS_ENABLE);
+ assigned_dev_update_msi(pci_dev);
+ }
+
+ snprintf(reset_file, sizeof(reset_file),
+ "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/reset",
+ adev->host.domain, adev->host.bus, adev->host.slot,
+ adev->host.function);
+
+ /*
+ * Issue a device reset via pci-sysfs. Note that we use write(2) here
+ * and ignore the return value because some kernels have a bug that
+ * returns 0 rather than bytes written on success, sending us into an
+ * infinite retry loop using other write mechanisms.
+ */
+ fd = open(reset_file, O_WRONLY);
+ if (fd != -1) {
+ ret = write(fd, reset, strlen(reset));
+ (void)ret;
+ close(fd);
+ }
+
+ /*
+ * When a 0 is written to the bus master register, the device is logically
+ * disconnected from the PCI bus. This avoids further DMA transfers.
+ */
+ assigned_dev_pci_write_config(pci_dev, PCI_COMMAND, 0, 1);
+}
+
+static int assigned_initfn(struct PCIDevice *pci_dev)
+{
+ AssignedDevice *dev = DO_UPCAST(AssignedDevice, dev, pci_dev);
+ uint8_t e_intx;
+ int r;
+
+ if (!kvm_enabled()) {
+ error_report("pci-assign: error: requires KVM support");
+ return -1;
+ }
+
+ if (!dev->host.domain && !dev->host.bus && !dev->host.slot &&
+ !dev->host.function) {
+ error_report("pci-assign: error: no host device specified");
+ return -1;
+ }
+
+ /*
+ * Set up basic config space access control. Will be further refined during
+ * device initialization.
+ */
+ assigned_dev_emulate_config_read(dev, 0, PCI_CONFIG_SPACE_SIZE);
+ assigned_dev_direct_config_read(dev, PCI_STATUS, 2);
+ assigned_dev_direct_config_read(dev, PCI_REVISION_ID, 1);
+ assigned_dev_direct_config_read(dev, PCI_CLASS_PROG, 3);
+ assigned_dev_direct_config_read(dev, PCI_CACHE_LINE_SIZE, 1);
+ assigned_dev_direct_config_read(dev, PCI_LATENCY_TIMER, 1);
+ assigned_dev_direct_config_read(dev, PCI_BIST, 1);
+ assigned_dev_direct_config_read(dev, PCI_CARDBUS_CIS, 4);
+ assigned_dev_direct_config_read(dev, PCI_SUBSYSTEM_VENDOR_ID, 2);
+ assigned_dev_direct_config_read(dev, PCI_SUBSYSTEM_ID, 2);
+ assigned_dev_direct_config_read(dev, PCI_CAPABILITY_LIST + 1, 7);
+ assigned_dev_direct_config_read(dev, PCI_MIN_GNT, 1);
+ assigned_dev_direct_config_read(dev, PCI_MAX_LAT, 1);
+ memcpy(dev->emulate_config_write, dev->emulate_config_read,
+ sizeof(dev->emulate_config_read));
+
+ if (get_real_device(dev, dev->host.domain, dev->host.bus,
+ dev->host.slot, dev->host.function)) {
+ error_report("pci-assign: Error: Couldn't get real device (%s)!",
+ dev->dev.qdev.id);
+ goto out;
+ }
+
+ if (assigned_device_pci_cap_init(pci_dev) < 0) {
+ goto out;
+ }
+
+ /* intercept MSI-X entry page in the MMIO */
+ if (dev->cap.available & ASSIGNED_DEVICE_CAP_MSIX) {
+ if (assigned_dev_register_msix_mmio(dev)) {
+ goto out;
+ }
+ }
+
+ /* handle real device's MMIO/PIO BARs */
+ if (assigned_dev_register_regions(dev->real_device.regions,
+ dev->real_device.region_number,
+ dev)) {
+ goto out;
+ }
+
+ /* handle interrupt routing */
+ e_intx = dev->dev.config[PCI_INTERRUPT_PIN] - 1;
+ dev->intpin = e_intx;
+ dev->intx_route.mode = PCI_INTX_DISABLED;
+ dev->intx_route.irq = -1;
+
+ /* assign device to guest */
+ r = assign_device(dev);
+ if (r < 0) {
+ goto out;
+ }
+
+ /* assign legacy INTx to the device */
+ r = assign_intx(dev);
+ if (r < 0) {
+ goto assigned_out;
+ }
+
+ assigned_dev_load_option_rom(dev);
+
+ add_boot_device_path(dev->bootindex, &pci_dev->qdev, NULL);
+
+ return 0;
+
+assigned_out:
+ deassign_device(dev);
+out:
+ free_assigned_device(dev);
+ return -1;
+}
+
+static void assigned_exitfn(struct PCIDevice *pci_dev)
+{
+ AssignedDevice *dev = DO_UPCAST(AssignedDevice, dev, pci_dev);
+
+ deassign_device(dev);
+ free_assigned_device(dev);
+}
+
+static Property assigned_dev_properties[] = {
+ DEFINE_PROP_PCI_HOST_DEVADDR("host", AssignedDevice, host),
+ DEFINE_PROP_BIT("prefer_msi", AssignedDevice, features,
+ ASSIGNED_DEVICE_PREFER_MSI_BIT, false),
+ DEFINE_PROP_BIT("share_intx", AssignedDevice, features,
+ ASSIGNED_DEVICE_SHARE_INTX_BIT, true),
+ DEFINE_PROP_INT32("bootindex", AssignedDevice, bootindex, -1),
+ DEFINE_PROP_STRING("configfd", AssignedDevice, configfd_name),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void assign_class_init(ObjectClass *klass, void *data)
+{
+ PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ k->init = assigned_initfn;
+ k->exit = assigned_exitfn;
+ k->config_read = assigned_dev_pci_read_config;
+ k->config_write = assigned_dev_pci_write_config;
+ dc->props = assigned_dev_properties;
+ dc->vmsd = &vmstate_assigned_device;
+ dc->reset = reset_assigned_device;
+ dc->desc = "KVM-based PCI passthrough";
+}
+
+static const TypeInfo assign_info = {
+ .name = "kvm-pci-assign",
+ .parent = TYPE_PCI_DEVICE,
+ .instance_size = sizeof(AssignedDevice),
+ .class_init = assign_class_init,
+};
+
+static void assign_register_types(void)
+{
+ type_register_static(&assign_info);
+}
+
+type_init(assign_register_types)
+
+/*
+ * Scan the assigned devices for the devices that have an option ROM, and then
+ * load the corresponding ROM data to RAM. If an error occurs while loading an
+ * option ROM, we just ignore that option ROM and continue with the next one.
+ */
+static void assigned_dev_load_option_rom(AssignedDevice *dev)
+{
+ char name[32], rom_file[64];
+ FILE *fp;
+ uint8_t val;
+ struct stat st;
+ void *ptr;
+
+ /* If loading ROM from file, pci handles it */
+ if (dev->dev.romfile || !dev->dev.rom_bar) {
+ return;
+ }
+
+ snprintf(rom_file, sizeof(rom_file),
+ "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/rom",
+ dev->host.domain, dev->host.bus, dev->host.slot,
+ dev->host.function);
+
+ if (stat(rom_file, &st)) {
+ return;
+ }
+
+ if (access(rom_file, F_OK)) {
+ error_report("pci-assign: Insufficient privileges for %s", rom_file);
+ return;
+ }
+
+ /* Write "1" to the ROM file to enable it */
+ fp = fopen(rom_file, "r+");
+ if (fp == NULL) {
+ return;
+ }
+ val = 1;
+ if (fwrite(&val, 1, 1, fp) != 1) {
+ goto close_rom;
+ }
+ fseek(fp, 0, SEEK_SET);
+
+ snprintf(name, sizeof(name), "%s.rom",
+ object_get_typename(OBJECT(dev)));
+ memory_region_init_ram(&dev->dev.rom, name, st.st_size);
+ vmstate_register_ram(&dev->dev.rom, &dev->dev.qdev);
+ ptr = memory_region_get_ram_ptr(&dev->dev.rom);
+ memset(ptr, 0xff, st.st_size);
+
+ if (!fread(ptr, 1, st.st_size, fp)) {
+ error_report("pci-assign: Cannot read from host %s\n"
+ "\tDevice option ROM contents are probably invalid "
+ "(check dmesg).\n\tSkip option ROM probe with rombar=0, "
+ "or load from file with romfile=", rom_file);
+ memory_region_destroy(&dev->dev.rom);
+ goto close_rom;
+ }
+
+ pci_register_bar(&dev->dev, PCI_ROM_SLOT, 0, &dev->dev.rom);
+ dev->dev.has_rom = true;
+close_rom:
+ /* Write "0" to disable ROM */
+ fseek(fp, 0, SEEK_SET);
+ val = 0;
+ if (!fwrite(&val, 1, 1, fp)) {
+ DEBUG("%s\n", "Failed to disable pci-sysfs rom file");
+ }
+ fclose(fp);
+}
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-01 06:03:06 +0000