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kernel / pub / scm / virt / qemu / amit / virtio-rng / refs/heads/upstream-merge / . / hw / device-assignment.c
blob: 0e2c7b52ba67929e3ba5f5881e6a133c594397d1 [file] [log] [blame]
/*
* Copyright (c) 2007, Neocleus Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place - Suite 330, Boston, MA 02111-1307 USA.
*
*
* Assign a PCI device from the host to a guest VM.
*
* Adapted for KVM by Qumranet.
*
* 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/types.h>
#include <sys/stat.h>
#include "qemu-kvm.h"
#include "hw.h"
#include "pc.h"
#include "qemu-error.h"
#include "console.h"
#include "device-assignment.h"
#include "loader.h"
#include "monitor.h"
#include "range.h"
#include "sysemu.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 1 */
#ifdef DEVICE_ASSIGNMENT_DEBUG
#define DEBUG(fmt, ...) \
do { \
fprintf(stderr, "%s: " fmt, __func__ , __VA_ARGS__); \
} while (0)
#else
#define DEBUG(fmt, ...) do { } while(0)
#endif
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=%lx, size=%d, e_phys=%lx, addr=%lx\n",
*data, size, addr, addr);
if (pwrite(fd, data, size, addr) != size) {
fprintf(stderr, "%s - pwrite failed %s\n",
__func__, strerror(errno));
}
} else {
if (pread(fd, &val, size, addr) != size) {
fprintf(stderr, "%s - pread failed %s\n",
__func__, strerror(errno));
val = (1UL << (size * 8)) - 1;
}
DEBUG("pread val=%lx, size=%d, e_phys=%lx, addr=%lx\n",
val, size, addr, addr);
}
} else {
uint32_t port = addr + dev_region->u.r_baseport;
if (data) {
DEBUG("out data=%lx, size=%d, e_phys=%lx, 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=%lx, size=%d, e_phys=%lx, 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 = 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 = 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 = 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 = 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) {
int 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];
int r;
region->e_size = size;
if (region->region->resource_fd < 0) {
r = kvm_add_ioport_region(region->u.r_baseport, region->r_size,
pci_dev->qdev.hotplugged);
if (r < 0) {
fprintf(stderr, "%s: failed to enable ioport access (%m)\n",
__func__);
}
}
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;
fprintf(stderr, "%s: pread failed, ret = %zd errno = %d\n",
__func__, ret, errno);
exit(1);
}
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;
fprintf(stderr, "%s: pwrite failed, ret = %zd errno = %d\n",
__func__, ret, errno);
exit(1);
}
return;
}
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;
pci_dev->v_addrs[i].num = i;
/* 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;
fprintf(stderr, "%s: Error: Couldn't mmap 0x%x!"
"\n", __func__,
(uint32_t) (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) {
fprintf(stderr, "PCI region %d at address 0x%llx "
"has size 0x%x, which is not a multiple of 4K. "
"You might experience some performance hit "
"due to that.\n",
i, (unsigned long long)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) {
fprintf(stderr, "Unexpected return from I/O port read: %d\n",
ret);
abort();
} else if (errno != EINVAL) {
fprintf(stderr, "Using raw in/out ioport access (sysfs - %s)\n",
strerror(errno));
close(pci_dev->v_addrs[i].region->resource_fd);
pci_dev->v_addrs[i].region->resource_fd = -1;
}
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) {
fprintf(stderr, "%s: %s: %m\n", __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;
unsigned long long start, end, size, flags;
uint16_t id;
struct stat statbuf;
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) {
fprintf(stderr, "%s: (%s) unkown\n", __func__,
pci_dev->configfd_name);
return 1;
}
}
} else {
dev->config_fd = open(name, O_RDWR);
if (dev->config_fd == -1) {
fprintf(stderr, "%s: %s: %m\n", __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;
fprintf(stderr, "%s: read failed, errno = %d\n", __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) {
fprintf(stderr, "%s: %s: %m\n", __func__, name);
return 1;
}
for (r = 0; r < PCI_ROM_SLOT; r++) {
if (fscanf(f, "%lli %lli %lli\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 %d start 0x%llx 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;
/* dealing with virtual function device */
snprintf(name, sizeof(name), "%sphysfn/", dir);
if (!stat(name, &statbuf)) {
/* always provide the written value on readout */
assigned_dev_emulate_config_read(pci_dev, PCI_COMMAND, 2);
}
dev->region_number = r;
return 0;
}
static QLIST_HEAD(, AssignedDevice) devs = QLIST_HEAD_INITIALIZER(devs);
static void free_dev_irq_entries(AssignedDevice *dev)
{
int i;
for (i = 0; i < dev->irq_entries_nr; i++) {
if (dev->entry[i].type) {
kvm_del_routing_entry(&dev->entry[i]);
}
}
g_free(dev->entry);
dev->entry = NULL;
dev->irq_entries_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 (pci_region->resource_fd < 0) {
kvm_remove_ioport_region(region->u.r_baseport, region->r_size,
dev->dev.qdev.hotplugged);
}
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)) {
fprintf(stderr,
"Failed to unmap assigned device region: %s\n",
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_dev_irq_entries(dev);
}
static uint32_t calc_assigned_dev_id(AssignedDevice *dev)
{
return (uint32_t)dev->h_segnr << 16 | (uint32_t)dev->h_busnr << 8 |
(uint32_t)dev->h_devfn;
}
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;
sprintf(dir, "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/",
dev->host.seg, dev->host.bus, dev->host.dev, dev->host.func);
sprintf(name, "%sdriver", dir);
r = readlink(name, driver, sizeof(driver));
if ((r <= 0) || r >= sizeof(driver) || !(ns = strrchr(driver, '/'))) {
goto fail;
}
ns++;
if (get_real_vendor_id(dir, &vendor_id) ||
get_real_device_id(dir, &device_id)) {
goto fail;
}
fprintf(stderr, "*** The driver '%s' is occupying your device "
"%04x:%02x:%02x.%x.\n",
ns, dev->host.seg, dev->host.bus, dev->host.dev, dev->host.func);
fprintf(stderr, "***\n");
fprintf(stderr, "*** You can try the following commands to free it:\n");
fprintf(stderr, "***\n");
fprintf(stderr, "*** $ echo \"%04x %04x\" > /sys/bus/pci/drivers/pci-stub/"
"new_id\n", vendor_id, device_id);
fprintf(stderr, "*** $ echo \"%04x:%02x:%02x.%x\" > /sys/bus/pci/drivers/"
"%s/unbind\n",
dev->host.seg, dev->host.bus, dev->host.dev, dev->host.func, ns);
fprintf(stderr, "*** $ echo \"%04x:%02x:%02x.%x\" > /sys/bus/pci/drivers/"
"pci-stub/bind\n",
dev->host.seg, dev->host.bus, dev->host.dev, dev->host.func);
fprintf(stderr, "*** $ echo \"%04x %04x\" > /sys/bus/pci/drivers/pci-stub"
"/remove_id\n", vendor_id, device_id);
fprintf(stderr, "***\n");
return;
fail:
fprintf(stderr, "Couldn't find out why.\n");
}
static int assign_device(AssignedDevice *dev)
{
struct kvm_assigned_pci_dev assigned_dev_data;
int r;
/* Only pass non-zero PCI segment to capable module */
if (!kvm_check_extension(kvm_state, KVM_CAP_PCI_SEGMENT) &&
dev->h_segnr) {
fprintf(stderr, "Can't assign device inside non-zero PCI segment "
"as this KVM module doesn't support it.\n");
return -ENODEV;
}
memset(&assigned_dev_data, 0, sizeof(assigned_dev_data));
assigned_dev_data.assigned_dev_id = calc_assigned_dev_id(dev);
assigned_dev_data.segnr = dev->h_segnr;
assigned_dev_data.busnr = dev->h_busnr;
assigned_dev_data.devfn = dev->h_devfn;
/* We always enable the IOMMU unless disabled on the command line */
if (dev->features & ASSIGNED_DEVICE_USE_IOMMU_MASK) {
if (!kvm_check_extension(kvm_state, KVM_CAP_IOMMU)) {
fprintf(stderr, "No IOMMU found. Unable to assign device \"%s\"\n",
dev->dev.qdev.id);
return -ENODEV;
}
assigned_dev_data.flags |= KVM_DEV_ASSIGN_ENABLE_IOMMU;
}
if (!(dev->features & ASSIGNED_DEVICE_USE_IOMMU_MASK)) {
fprintf(stderr,
"WARNING: Assigning a device without IOMMU protection can "
"cause host memory corruption if the device issues DMA write "
"requests!\n");
}
r = kvm_assign_pci_device(kvm_state, &assigned_dev_data);
if (r < 0) {
fprintf(stderr, "Failed to assign device \"%s\" : %s\n",
dev->dev.qdev.id, strerror(-r));
switch (r) {
case -EBUSY:
assign_failed_examine(dev);
break;
default:
break;
}
}
return r;
}
static int assign_irq(AssignedDevice *dev)
{
struct kvm_assigned_irq assigned_irq_data;
int irq, r = 0;
/* Interrupt PIN 0 means don't use INTx */
if (assigned_dev_pci_read_byte(&dev->dev, PCI_INTERRUPT_PIN) == 0)
return 0;
irq = pci_map_irq(&dev->dev, dev->intpin);
irq = piix_get_irq(irq);
if (dev->girq == irq)
return r;
memset(&assigned_irq_data, 0, sizeof(assigned_irq_data));
assigned_irq_data.assigned_dev_id = calc_assigned_dev_id(dev);
assigned_irq_data.guest_irq = irq;
assigned_irq_data.host_irq = dev->real_device.irq;
if (dev->irq_requested_type) {
assigned_irq_data.flags = dev->irq_requested_type;
r = kvm_deassign_irq(kvm_state, &assigned_irq_data);
if (r) {
perror("assign_irq: deassign");
}
dev->irq_requested_type = 0;
}
assigned_irq_data.flags = KVM_DEV_IRQ_GUEST_INTX;
if (dev->features & ASSIGNED_DEVICE_PREFER_MSI_MASK &&
dev->cap.available & ASSIGNED_DEVICE_CAP_MSI)
assigned_irq_data.flags |= KVM_DEV_IRQ_HOST_MSI;
else
assigned_irq_data.flags |= KVM_DEV_IRQ_HOST_INTX;
r = kvm_assign_irq(kvm_state, &assigned_irq_data);
if (r < 0) {
fprintf(stderr, "Failed to assign irq for \"%s\": %s\n",
dev->dev.qdev.id, strerror(-r));
fprintf(stderr, "Perhaps you are assigning a device "
"that shares an IRQ with another device?\n");
return r;
}
dev->girq = irq;
dev->irq_requested_type = assigned_irq_data.flags;
return r;
}
static void deassign_device(AssignedDevice *dev)
{
struct kvm_assigned_pci_dev assigned_dev_data;
int r;
memset(&assigned_dev_data, 0, sizeof(assigned_dev_data));
assigned_dev_data.assigned_dev_id = calc_assigned_dev_id(dev);
r = kvm_deassign_pci_device(kvm_state, &assigned_dev_data);
if (r < 0)
fprintf(stderr, "Failed to deassign device \"%s\" : %s\n",
dev->dev.qdev.id, strerror(-r));
}
#if 0
AssignedDevInfo *get_assigned_device(int pcibus, int slot)
{
AssignedDevice *assigned_dev = NULL;
AssignedDevInfo *adev = NULL;
QLIST_FOREACH(adev, &adev_head, next) {
assigned_dev = adev->assigned_dev;
if (pci_bus_num(assigned_dev->dev.bus) == pcibus &&
PCI_SLOT(assigned_dev->dev.devfn) == slot)
return adev;
}
return NULL;
}
#endif
/* The pci config space got updated. Check if irq numbers have changed
* for our devices
*/
void assigned_dev_update_irqs(void)
{
AssignedDevice *dev, *next;
int r;
dev = QLIST_FIRST(&devs);
while (dev) {
next = QLIST_NEXT(dev, next);
if (dev->irq_requested_type & KVM_DEV_IRQ_HOST_INTX) {
r = assign_irq(dev);
if (r < 0) {
qdev_unplug(&dev->dev.qdev);
}
}
dev = next;
}
}
static void assigned_dev_update_msi(PCIDevice *pci_dev)
{
struct kvm_assigned_irq assigned_irq_data;
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;
memset(&assigned_irq_data, 0, sizeof assigned_irq_data);
assigned_irq_data.assigned_dev_id = calc_assigned_dev_id(assigned_dev);
/* 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->irq_requested_type & KVM_DEV_IRQ_GUEST_MSI) ||
(ctrl_byte & PCI_MSI_FLAGS_ENABLE)) {
assigned_irq_data.flags = assigned_dev->irq_requested_type;
free_dev_irq_entries(assigned_dev);
r = kvm_deassign_irq(kvm_state, &assigned_irq_data);
/* -ENXIO means no assigned irq */
if (r && r != -ENXIO)
perror("assigned_dev_update_msi: deassign irq");
assigned_dev->irq_requested_type = 0;
}
if (ctrl_byte & PCI_MSI_FLAGS_ENABLE) {
uint8_t *pos = pci_dev->config + pci_dev->msi_cap;
assigned_dev->entry = g_malloc0(sizeof(*(assigned_dev->entry)));
assigned_dev->entry->u.msi.address_lo =
pci_get_long(pos + PCI_MSI_ADDRESS_LO);
assigned_dev->entry->u.msi.address_hi = 0;
assigned_dev->entry->u.msi.data = pci_get_word(pos + PCI_MSI_DATA_32);
assigned_dev->entry->type = KVM_IRQ_ROUTING_MSI;
r = kvm_get_irq_route_gsi();
if (r < 0) {
perror("assigned_dev_update_msi: kvm_get_irq_route_gsi");
return;
}
assigned_dev->entry->gsi = r;
kvm_add_routing_entry(assigned_dev->entry);
if (kvm_commit_irq_routes() < 0) {
perror("assigned_dev_update_msi: kvm_commit_irq_routes");
assigned_dev->cap.state &= ~ASSIGNED_DEVICE_MSI_ENABLED;
return;
}
assigned_dev->irq_entries_nr = 1;
assigned_irq_data.guest_irq = assigned_dev->entry->gsi;
assigned_irq_data.flags = KVM_DEV_IRQ_HOST_MSI | KVM_DEV_IRQ_GUEST_MSI;
if (kvm_assign_irq(kvm_state, &assigned_irq_data) < 0) {
perror("assigned_dev_enable_msi: assign irq");
}
assigned_dev->girq = -1;
assigned_dev->irq_requested_type = assigned_irq_data.flags;
} else {
assign_irq(assigned_dev);
}
}
static bool 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;
struct kvm_assigned_msix_nr msix_nr;
struct kvm_assigned_msix_entry msix_entry;
MSIXTableEntry *entry = adev->msix_table;
/* Get the usable entry number for allocating */
for (i = 0; i < adev->msix_max; i++, entry++) {
if (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;
}
msix_nr.assigned_dev_id = calc_assigned_dev_id(adev);
msix_nr.entry_nr = entries_nr;
r = kvm_assign_set_msix_nr(kvm_state, &msix_nr);
if (r != 0) {
fprintf(stderr, "fail to set MSI-X entry number for MSIX! %s\n",
strerror(-r));
return r;
}
free_dev_irq_entries(adev);
adev->irq_entries_nr = adev->msix_max;
adev->entry = g_malloc0(adev->msix_max * sizeof(*(adev->entry)));
msix_entry.assigned_dev_id = msix_nr.assigned_dev_id;
entry = adev->msix_table;
for (i = 0; i < adev->msix_max; i++, entry++) {
if (msix_masked(entry)) {
continue;
}
r = kvm_get_irq_route_gsi();
if (r < 0)
return r;
adev->entry[i].gsi = r;
adev->entry[i].type = KVM_IRQ_ROUTING_MSI;
adev->entry[i].flags = 0;
adev->entry[i].u.msi.address_lo = entry->addr_lo;
adev->entry[i].u.msi.address_hi = entry->addr_hi;
adev->entry[i].u.msi.data = entry->data;
DEBUG("MSI-X vector %d, gsi %d, addr %08x_%08x, data %08x\n", i,
r, entry->addr_hi, entry->addr_lo, entry->data);
kvm_add_routing_entry(&adev->entry[i]);
msix_entry.gsi = adev->entry[i].gsi;
msix_entry.entry = i;
r = kvm_assign_set_msix_entry(kvm_state, &msix_entry);
if (r) {
fprintf(stderr, "fail to set MSI-X entry! %s\n", strerror(-r));
break;
}
}
if (r == 0 && kvm_commit_irq_routes() < 0) {
perror("assigned_dev_update_msix_mmio: kvm_commit_irq_routes");
return -EINVAL;
}
return r;
}
static void assigned_dev_update_msix(PCIDevice *pci_dev)
{
struct kvm_assigned_irq assigned_irq_data;
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;
memset(&assigned_irq_data, 0, sizeof assigned_irq_data);
assigned_irq_data.assigned_dev_id = calc_assigned_dev_id(assigned_dev);
/* 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->irq_requested_type & KVM_DEV_IRQ_GUEST_MSIX) ||
(ctrl_word & PCI_MSIX_FLAGS_ENABLE)) {
assigned_irq_data.flags = assigned_dev->irq_requested_type;
free_dev_irq_entries(assigned_dev);
r = kvm_deassign_irq(kvm_state, &assigned_irq_data);
/* -ENXIO means no assigned irq */
if (r && r != -ENXIO)
perror("assigned_dev_update_msix: deassign irq");
assigned_dev->irq_requested_type = 0;
}
if (ctrl_word & PCI_MSIX_FLAGS_ENABLE) {
assigned_irq_data.flags = KVM_DEV_IRQ_HOST_MSIX |
KVM_DEV_IRQ_GUEST_MSIX;
if (assigned_dev_update_msix_mmio(pci_dev) < 0) {
perror("assigned_dev_update_msix_mmio");
return;
}
if (assigned_dev->irq_entries_nr) {
if (kvm_assign_irq(kvm_state, &assigned_irq_data) < 0) {
perror("assigned_dev_enable_msix: assign irq");
return;
}
}
assigned_dev->girq = -1;
assigned_dev->irq_requested_type = assigned_irq_data.flags;
} else {
assign_irq(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);
uint32_t emulate_mask, full_emulation_mask;
pci_default_write_config(pci_dev, address, val, len);
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)) {
dev->cap.available |= ASSIGNED_DEVICE_CAP_MSI;
/* Only 32-bit/no-mask currently supported */
if ((ret = pci_add_capability(pci_dev, PCI_CAP_ID_MSI, pos, 10)) < 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);
/* Would really like to test kvm_check_extension(, KVM_CAP_DEVICE_MSIX),
* but the kernel doesn't expose it. Instead do a dummy call to
* KVM_ASSIGN_SET_MSIX_NR to see if it exists. */
if (pos != 0 && kvm_assign_set_msix_nr(kvm_state, NULL) == -EFAULT) {
int bar_nr;
uint32_t msix_table_entry;
dev->cap.available |= ASSIGNED_DEVICE_CAP_MSIX;
if ((ret = pci_add_capability(pci_dev, PCI_CAP_ID_MSIX, pos, 12)) < 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 */
if ((pos = pci_find_cap_offset(pci_dev, PCI_CAP_ID_PM, 0))) {
uint16_t pmc;
if ((ret = pci_add_capability(pci_dev, PCI_CAP_ID_PM, pos,
PCI_PM_SIZEOF)) < 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);
}
if ((pos = pci_find_cap_offset(pci_dev, PCI_CAP_ID_EXP, 0))) {
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) {
fprintf(stderr,
"%s: Invalid size PCIe cap-id 0x%x \n",
__func__, PCI_CAP_ID_EXP);
return -EINVAL;
} else if (size != 0x3c) {
fprintf(stderr,
"WARNING, %s: PCIe cap-id 0x%x has "
"non-standard size 0x%x; std size should be 0x3c \n",
__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) {
fprintf(stderr,
"%s: Unsupported PCI express capability version %d\n",
__func__, version);
return -EINVAL;
}
if ((ret = pci_add_capability(pci_dev, PCI_CAP_ID_EXP,
pos, size)) < 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) {
fprintf(stderr,
"Device assignment only supports endpoint assignment, "
"device type %d\n", 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 */
}
}
if ((pos = pci_find_cap_offset(pci_dev, PCI_CAP_ID_PCIX, 0))) {
uint16_t cmd;
uint32_t status;
/* Only expose the minimum, 8 byte capability */
if ((ret = pci_add_capability(pci_dev, PCI_CAP_ID_PCIX, pos, 8)) < 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);
}
if ((pos = pci_find_cap_offset(pci_dev, PCI_CAP_ID_VPD, 0))) {
/* Direct R/W passthrough */
if ((ret = pci_add_capability(pci_dev, PCI_CAP_ID_VPD, pos, 8)) < 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 */
if ((ret = pci_add_capability(pci_dev, PCI_CAP_ID_VNDR,
pos, len)) < 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 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 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((void *)((uint8_t *)adev->msix_table + addr), &val, size);
if (ctrl & PCI_MSIX_FLAGS_ENABLE) {
MSIXTableEntry *entry = &adev->msix_table[i];
if (!msix_masked(&orig) && 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 (msix_masked(&orig) && !msix_masked(entry)) {
/* Vector unmasked */
if (i >= adev->irq_entries_nr || !adev->entry[i].type) {
/* Previously unassigned vector, start from scratch */
assigned_dev_update_msix(pdev);
return;
} else {
/* Update an existing, previously masked vector */
struct kvm_irq_routing_entry orig = adev->entry[i];
int ret;
adev->entry[i].u.msi.address_lo = entry->addr_lo;
adev->entry[i].u.msi.address_hi = entry->addr_hi;
adev->entry[i].u.msi.data = entry->data;
ret = kvm_update_routing_entry(&orig, &adev->entry[i]);
if (ret) {
fprintf(stderr,
"Error updating irq routing entry (%d)\n", ret);
return;
}
ret = kvm_commit_irq_routes();
if (ret) {
fprintf(stderr,
"Error committing irq routes (%d)\n", ret);
return;
}
}
}
}
}
static const MemoryRegionOps msix_mmio_ops = {
.read = msix_mmio_read,
.write = 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 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) {
fprintf(stderr, "fail allocate msix_table! %s\n", strerror(errno));
return -EFAULT;
}
msix_reset(dev);
memory_region_init_io(&dev->mmio, &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) {
fprintf(stderr, "error unmapping msix_table! %s\n",
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;
snprintf(reset_file, sizeof(reset_file),
"/sys/bus/pci/devices/%04x:%02x:%02x.%01x/reset",
adev->host.seg, adev->host.bus, adev->host.dev, adev->host.func);
/*
* 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 command 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, 2);
}
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.seg && !dev->host.bus && !dev->host.dev && !dev->host.func) {
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_COMMAND, 2);
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.seg, dev->host.bus,
dev->host.dev, dev->host.func)) {
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[0x3d] - 1;
dev->intpin = e_intx;
dev->run = 0;
dev->girq = -1;
dev->h_segnr = dev->host.seg;
dev->h_busnr = dev->host.bus;
dev->h_devfn = PCI_DEVFN(dev->host.dev, dev->host.func);
/* assign device to guest */
r = assign_device(dev);
if (r < 0)
goto out;
/* assign irq for the device */
r = assign_irq(dev);
if (r < 0)
goto assigned_out;
assigned_dev_load_option_rom(dev);
QLIST_INSERT_HEAD(&devs, dev, next);
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 int assigned_exitfn(struct PCIDevice *pci_dev)
{
AssignedDevice *dev = DO_UPCAST(AssignedDevice, dev, pci_dev);
QLIST_REMOVE(dev, next);
deassign_device(dev);
free_assigned_device(dev);
return 0;
}
static int parse_hostaddr(DeviceState *dev, Property *prop, const char *str)
{
PCIHostDevice *ptr = qdev_get_prop_ptr(dev, prop);
int rc;
rc = pci_parse_host_devaddr(str, &ptr->seg, &ptr->bus, &ptr->dev, &ptr->func);
if (rc != 0)
return -1;
return 0;
}
static int print_hostaddr(DeviceState *dev, Property *prop, char *dest, size_t len)
{
PCIHostDevice *ptr = qdev_get_prop_ptr(dev, prop);
return snprintf(dest, len, "%02x:%02x.%x", ptr->bus, ptr->dev, ptr->func);
}
PropertyInfo qdev_prop_hostaddr = {
.name = "pci-hostaddr",
.parse = parse_hostaddr,
.print = print_hostaddr,
};
static Property da_properties[] =
{
DEFINE_PROP("host", AssignedDevice, host, qdev_prop_hostaddr, PCIHostDevice),
DEFINE_PROP_BIT("iommu", AssignedDevice, features,
ASSIGNED_DEVICE_USE_IOMMU_BIT, true),
DEFINE_PROP_BIT("prefer_msi", AssignedDevice, features,
ASSIGNED_DEVICE_PREFER_MSI_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 = da_properties;
dc->vmsd = &vmstate_assigned_device;
dc->reset = reset_assigned_device;
}
static TypeInfo assign_info = {
.name = "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.seg, dev->host.bus, dev->host.dev, dev->host.func);
if (stat(rom_file, &st)) {
return;
}
if (access(rom_file, F_OK)) {
fprintf(stderr, "pci-assign: Insufficient privileges for %s\n",
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)) {
fprintf(stderr, "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=\n", 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);
}