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qemu/xen-all.c

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/*
* Copyright (C) 2010 Citrix Ltd.
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
#include <sys/mman.h>
#include "hw/pci.h"
#include "hw/pc.h"
#include "hw/xen_common.h"
#include "hw/xen_backend.h"
#include "xen-mapcache.h"
#include "trace.h"
#include <xen/hvm/ioreq.h>
#include <xen/hvm/params.h>
//#define DEBUG_XEN
#ifdef DEBUG_XEN
#define DPRINTF(fmt, ...) \
do { fprintf(stderr, "xen: " fmt, ## __VA_ARGS__); } while (0)
#else
#define DPRINTF(fmt, ...) \
do { } while (0)
#endif
/* Compatibility with older version */
#if __XEN_LATEST_INTERFACE_VERSION__ < 0x0003020a
static inline uint32_t xen_vcpu_eport(shared_iopage_t *shared_page, int i)
{
return shared_page->vcpu_iodata[i].vp_eport;
}
static inline ioreq_t *xen_vcpu_ioreq(shared_iopage_t *shared_page, int vcpu)
{
return &shared_page->vcpu_iodata[vcpu].vp_ioreq;
}
# define FMT_ioreq_size PRIx64
#else
static inline uint32_t xen_vcpu_eport(shared_iopage_t *shared_page, int i)
{
return shared_page->vcpu_ioreq[i].vp_eport;
}
static inline ioreq_t *xen_vcpu_ioreq(shared_iopage_t *shared_page, int vcpu)
{
return &shared_page->vcpu_ioreq[vcpu];
}
# define FMT_ioreq_size "u"
#endif
#define BUFFER_IO_MAX_DELAY 100
typedef struct XenIOState {
shared_iopage_t *shared_page;
buffered_iopage_t *buffered_io_page;
QEMUTimer *buffered_io_timer;
/* the evtchn port for polling the notification, */
evtchn_port_t *ioreq_local_port;
/* the evtchn fd for polling */
XenEvtchn xce_handle;
/* which vcpu we are serving */
int send_vcpu;
struct xs_handle *xenstore;
Notifier exit;
} XenIOState;
/* Xen specific function for piix pci */
int xen_pci_slot_get_pirq(PCIDevice *pci_dev, int irq_num)
{
return irq_num + ((pci_dev->devfn >> 3) << 2);
}
void xen_piix3_set_irq(void *opaque, int irq_num, int level)
{
xc_hvm_set_pci_intx_level(xen_xc, xen_domid, 0, 0, irq_num >> 2,
irq_num & 3, level);
}
void xen_piix_pci_write_config_client(uint32_t address, uint32_t val, int len)
{
int i;
/* Scan for updates to PCI link routes (0x60-0x63). */
for (i = 0; i < len; i++) {
uint8_t v = (val >> (8 * i)) & 0xff;
if (v & 0x80) {
v = 0;
}
v &= 0xf;
if (((address + i) >= 0x60) && ((address + i) <= 0x63)) {
xc_hvm_set_pci_link_route(xen_xc, xen_domid, address + i - 0x60, v);
}
}
}
void xen_cmos_set_s3_resume(void *opaque, int irq, int level)
{
pc_cmos_set_s3_resume(opaque, irq, level);
if (level) {
xc_set_hvm_param(xen_xc, xen_domid, HVM_PARAM_ACPI_S_STATE, 3);
}
}
/* Xen Interrupt Controller */
static void xen_set_irq(void *opaque, int irq, int level)
{
xc_hvm_set_isa_irq_level(xen_xc, xen_domid, irq, level);
}
qemu_irq *xen_interrupt_controller_init(void)
{
return qemu_allocate_irqs(xen_set_irq, NULL, 16);
}
/* Memory Ops */
static void xen_ram_init(ram_addr_t ram_size)
{
RAMBlock *new_block;
ram_addr_t below_4g_mem_size, above_4g_mem_size = 0;
new_block = qemu_mallocz(sizeof (*new_block));
pstrcpy(new_block->idstr, sizeof (new_block->idstr), "xen.ram");
new_block->host = NULL;
new_block->offset = 0;
new_block->length = ram_size;
QLIST_INSERT_HEAD(&ram_list.blocks, new_block, next);
ram_list.phys_dirty = qemu_realloc(ram_list.phys_dirty,
new_block->length >> TARGET_PAGE_BITS);
memset(ram_list.phys_dirty + (new_block->offset >> TARGET_PAGE_BITS),
0xff, new_block->length >> TARGET_PAGE_BITS);
if (ram_size >= 0xe0000000 ) {
above_4g_mem_size = ram_size - 0xe0000000;
below_4g_mem_size = 0xe0000000;
} else {
below_4g_mem_size = ram_size;
}
cpu_register_physical_memory(0, below_4g_mem_size, new_block->offset);
#if TARGET_PHYS_ADDR_BITS > 32
if (above_4g_mem_size > 0) {
cpu_register_physical_memory(0x100000000ULL, above_4g_mem_size,
new_block->offset + below_4g_mem_size);
}
#endif
}
void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size)
{
unsigned long nr_pfn;
xen_pfn_t *pfn_list;
int i;
trace_xen_ram_alloc(ram_addr, size);
nr_pfn = size >> TARGET_PAGE_BITS;
pfn_list = qemu_malloc(sizeof (*pfn_list) * nr_pfn);
for (i = 0; i < nr_pfn; i++) {
pfn_list[i] = (ram_addr >> TARGET_PAGE_BITS) + i;
}
if (xc_domain_populate_physmap_exact(xen_xc, xen_domid, nr_pfn, 0, 0, pfn_list)) {
hw_error("xen: failed to populate ram at %lx", ram_addr);
}
qemu_free(pfn_list);
}
/* VCPU Operations, MMIO, IO ring ... */
static void xen_reset_vcpu(void *opaque)
{
CPUState *env = opaque;
env->halted = 1;
}
void xen_vcpu_init(void)
{
CPUState *first_cpu;
if ((first_cpu = qemu_get_cpu(0))) {
qemu_register_reset(xen_reset_vcpu, first_cpu);
xen_reset_vcpu(first_cpu);
}
}
/* get the ioreq packets from share mem */
static ioreq_t *cpu_get_ioreq_from_shared_memory(XenIOState *state, int vcpu)
{
ioreq_t *req = xen_vcpu_ioreq(state->shared_page, vcpu);
if (req->state != STATE_IOREQ_READY) {
DPRINTF("I/O request not ready: "
"%x, ptr: %x, port: %"PRIx64", "
"data: %"PRIx64", count: %" FMT_ioreq_size ", size: %" FMT_ioreq_size "\n",
req->state, req->data_is_ptr, req->addr,
req->data, req->count, req->size);
return NULL;
}
xen_rmb(); /* see IOREQ_READY /then/ read contents of ioreq */
req->state = STATE_IOREQ_INPROCESS;
return req;
}
/* use poll to get the port notification */
/* ioreq_vec--out,the */
/* retval--the number of ioreq packet */
static ioreq_t *cpu_get_ioreq(XenIOState *state)
{
int i;
evtchn_port_t port;
port = xc_evtchn_pending(state->xce_handle);
if (port != -1) {
for (i = 0; i < smp_cpus; i++) {
if (state->ioreq_local_port[i] == port) {
break;
}
}
if (i == smp_cpus) {
hw_error("Fatal error while trying to get io event!\n");
}
/* unmask the wanted port again */
xc_evtchn_unmask(state->xce_handle, port);
/* get the io packet from shared memory */
state->send_vcpu = i;
return cpu_get_ioreq_from_shared_memory(state, i);
}
/* read error or read nothing */
return NULL;
}
static uint32_t do_inp(pio_addr_t addr, unsigned long size)
{
switch (size) {
case 1:
return cpu_inb(addr);
case 2:
return cpu_inw(addr);
case 4:
return cpu_inl(addr);
default:
hw_error("inp: bad size: %04"FMT_pioaddr" %lx", addr, size);
}
}
static void do_outp(pio_addr_t addr,
unsigned long size, uint32_t val)
{
switch (size) {
case 1:
return cpu_outb(addr, val);
case 2:
return cpu_outw(addr, val);
case 4:
return cpu_outl(addr, val);
default:
hw_error("outp: bad size: %04"FMT_pioaddr" %lx", addr, size);
}
}
static void cpu_ioreq_pio(ioreq_t *req)
{
int i, sign;
sign = req->df ? -1 : 1;
if (req->dir == IOREQ_READ) {
if (!req->data_is_ptr) {
req->data = do_inp(req->addr, req->size);
} else {
uint32_t tmp;
for (i = 0; i < req->count; i++) {
tmp = do_inp(req->addr, req->size);
cpu_physical_memory_write(req->data + (sign * i * req->size),
(uint8_t *) &tmp, req->size);
}
}
} else if (req->dir == IOREQ_WRITE) {
if (!req->data_is_ptr) {
do_outp(req->addr, req->size, req->data);
} else {
for (i = 0; i < req->count; i++) {
uint32_t tmp = 0;
cpu_physical_memory_read(req->data + (sign * i * req->size),
(uint8_t*) &tmp, req->size);
do_outp(req->addr, req->size, tmp);
}
}
}
}
static void cpu_ioreq_move(ioreq_t *req)
{
int i, sign;
sign = req->df ? -1 : 1;
if (!req->data_is_ptr) {
if (req->dir == IOREQ_READ) {
for (i = 0; i < req->count; i++) {
cpu_physical_memory_read(req->addr + (sign * i * req->size),
(uint8_t *) &req->data, req->size);
}
} else if (req->dir == IOREQ_WRITE) {
for (i = 0; i < req->count; i++) {
cpu_physical_memory_write(req->addr + (sign * i * req->size),
(uint8_t *) &req->data, req->size);
}
}
} else {
target_ulong tmp;
if (req->dir == IOREQ_READ) {
for (i = 0; i < req->count; i++) {
cpu_physical_memory_read(req->addr + (sign * i * req->size),
(uint8_t*) &tmp, req->size);
cpu_physical_memory_write(req->data + (sign * i * req->size),
(uint8_t*) &tmp, req->size);
}
} else if (req->dir == IOREQ_WRITE) {
for (i = 0; i < req->count; i++) {
cpu_physical_memory_read(req->data + (sign * i * req->size),
(uint8_t*) &tmp, req->size);
cpu_physical_memory_write(req->addr + (sign * i * req->size),
(uint8_t*) &tmp, req->size);
}
}
}
}
static void handle_ioreq(ioreq_t *req)
{
if (!req->data_is_ptr && (req->dir == IOREQ_WRITE) &&
(req->size < sizeof (target_ulong))) {
req->data &= ((target_ulong) 1 << (8 * req->size)) - 1;
}
switch (req->type) {
case IOREQ_TYPE_PIO:
cpu_ioreq_pio(req);
break;
case IOREQ_TYPE_COPY:
cpu_ioreq_move(req);
break;
case IOREQ_TYPE_TIMEOFFSET:
break;
case IOREQ_TYPE_INVALIDATE:
qemu_invalidate_map_cache();
break;
default:
hw_error("Invalid ioreq type 0x%x\n", req->type);
}
}
static void handle_buffered_iopage(XenIOState *state)
{
buf_ioreq_t *buf_req = NULL;
ioreq_t req;
int qw;
if (!state->buffered_io_page) {
return;
}
while (state->buffered_io_page->read_pointer != state->buffered_io_page->write_pointer) {
buf_req = &state->buffered_io_page->buf_ioreq[
state->buffered_io_page->read_pointer % IOREQ_BUFFER_SLOT_NUM];
req.size = 1UL << buf_req->size;
req.count = 1;
req.addr = buf_req->addr;
req.data = buf_req->data;
req.state = STATE_IOREQ_READY;
req.dir = buf_req->dir;
req.df = 1;
req.type = buf_req->type;
req.data_is_ptr = 0;
qw = (req.size == 8);
if (qw) {
buf_req = &state->buffered_io_page->buf_ioreq[
(state->buffered_io_page->read_pointer + 1) % IOREQ_BUFFER_SLOT_NUM];
req.data |= ((uint64_t)buf_req->data) << 32;
}
handle_ioreq(&req);
xen_mb();
state->buffered_io_page->read_pointer += qw ? 2 : 1;
}
}
static void handle_buffered_io(void *opaque)
{
XenIOState *state = opaque;
handle_buffered_iopage(state);
qemu_mod_timer(state->buffered_io_timer,
BUFFER_IO_MAX_DELAY + qemu_get_clock_ms(rt_clock));
}
static void cpu_handle_ioreq(void *opaque)
{
XenIOState *state = opaque;
ioreq_t *req = cpu_get_ioreq(state);
handle_buffered_iopage(state);
if (req) {
handle_ioreq(req);
if (req->state != STATE_IOREQ_INPROCESS) {
fprintf(stderr, "Badness in I/O request ... not in service?!: "
"%x, ptr: %x, port: %"PRIx64", "
"data: %"PRIx64", count: %" FMT_ioreq_size ", size: %" FMT_ioreq_size "\n",
req->state, req->data_is_ptr, req->addr,
req->data, req->count, req->size);
destroy_hvm_domain();
return;
}
xen_wmb(); /* Update ioreq contents /then/ update state. */
/*
* We do this before we send the response so that the tools
* have the opportunity to pick up on the reset before the
* guest resumes and does a hlt with interrupts disabled which
* causes Xen to powerdown the domain.
*/
if (vm_running) {
if (qemu_shutdown_requested_get()) {
destroy_hvm_domain();
}
if (qemu_reset_requested_get()) {
qemu_system_reset();
}
}
req->state = STATE_IORESP_READY;
xc_evtchn_notify(state->xce_handle, state->ioreq_local_port[state->send_vcpu]);
}
}
static void xenstore_record_dm_state(XenIOState *s, const char *state)
{
char path[50];
snprintf(path, sizeof (path), "/local/domain/0/device-model/%u/state", xen_domid);
if (!xs_write(s->xenstore, XBT_NULL, path, state, strlen(state))) {
fprintf(stderr, "error recording dm state\n");
exit(1);
}
}
static void xen_main_loop_prepare(XenIOState *state)
{
int evtchn_fd = -1;
if (state->xce_handle != XC_HANDLER_INITIAL_VALUE) {
evtchn_fd = xc_evtchn_fd(state->xce_handle);
}
state->buffered_io_timer = qemu_new_timer_ms(rt_clock, handle_buffered_io,
state);
qemu_mod_timer(state->buffered_io_timer, qemu_get_clock_ms(rt_clock));
if (evtchn_fd != -1) {
qemu_set_fd_handler(evtchn_fd, cpu_handle_ioreq, NULL, state);
}
/* record state running */
xenstore_record_dm_state(state, "running");
}
/* Initialise Xen */
static void xen_vm_change_state_handler(void *opaque, int running, int reason)
{
XenIOState *state = opaque;
if (running) {
xen_main_loop_prepare(state);
}
}
static void xen_exit_notifier(Notifier *n)
{
XenIOState *state = container_of(n, XenIOState, exit);
xc_evtchn_close(state->xce_handle);
xs_daemon_close(state->xenstore);
}
int xen_init(void)
{
xen_xc = xen_xc_interface_open(0, 0, 0);
if (xen_xc == XC_HANDLER_INITIAL_VALUE) {
xen_be_printf(NULL, 0, "can't open xen interface\n");
return -1;
}
return 0;
}
int xen_hvm_init(void)
{
int i, rc;
unsigned long ioreq_pfn;
XenIOState *state;
state = qemu_mallocz(sizeof (XenIOState));
state->xce_handle = xen_xc_evtchn_open(NULL, 0);
if (state->xce_handle == XC_HANDLER_INITIAL_VALUE) {
perror("xen: event channel open");
return -errno;
}
state->xenstore = xs_daemon_open();
if (state->xenstore == NULL) {
perror("xen: xenstore open");
return -errno;
}
state->exit.notify = xen_exit_notifier;
qemu_add_exit_notifier(&state->exit);
xc_get_hvm_param(xen_xc, xen_domid, HVM_PARAM_IOREQ_PFN, &ioreq_pfn);
DPRINTF("shared page at pfn %lx\n", ioreq_pfn);
state->shared_page = xc_map_foreign_range(xen_xc, xen_domid, XC_PAGE_SIZE,
PROT_READ|PROT_WRITE, ioreq_pfn);
if (state->shared_page == NULL) {
hw_error("map shared IO page returned error %d handle=" XC_INTERFACE_FMT,
errno, xen_xc);
}
xc_get_hvm_param(xen_xc, xen_domid, HVM_PARAM_BUFIOREQ_PFN, &ioreq_pfn);
DPRINTF("buffered io page at pfn %lx\n", ioreq_pfn);
state->buffered_io_page = xc_map_foreign_range(xen_xc, xen_domid, XC_PAGE_SIZE,
PROT_READ|PROT_WRITE, ioreq_pfn);
if (state->buffered_io_page == NULL) {
hw_error("map buffered IO page returned error %d", errno);
}
state->ioreq_local_port = qemu_mallocz(smp_cpus * sizeof (evtchn_port_t));
/* FIXME: how about if we overflow the page here? */
for (i = 0; i < smp_cpus; i++) {
rc = xc_evtchn_bind_interdomain(state->xce_handle, xen_domid,
xen_vcpu_eport(state->shared_page, i));
if (rc == -1) {
fprintf(stderr, "bind interdomain ioctl error %d\n", errno);
return -1;
}
state->ioreq_local_port[i] = rc;
}
/* Init RAM management */
qemu_map_cache_init();
xen_ram_init(ram_size);
qemu_add_vm_change_state_handler(xen_vm_change_state_handler, state);
return 0;
}
void destroy_hvm_domain(void)
{
XenXC xc_handle;
int sts;
xc_handle = xen_xc_interface_open(0, 0, 0);
if (xc_handle == XC_HANDLER_INITIAL_VALUE) {
fprintf(stderr, "Cannot acquire xenctrl handle\n");
} else {
sts = xc_domain_shutdown(xc_handle, xen_domid, SHUTDOWN_poweroff);
if (sts != 0) {
fprintf(stderr, "? xc_domain_shutdown failed to issue poweroff, "
"sts %d, %s\n", sts, strerror(errno));
} else {
fprintf(stderr, "Issued domain %d poweroff\n", xen_domid);
}
xc_interface_close(xc_handle);
}
}
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