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xemu/xen-all.c
Anthony PERARD 8a369e20e7 xen: Fix the memory registration to reflect of what is done by Xen. 
A Xen guest memory is allocated by libxc. But this memory is not
allocated continuously, instead, it leaves the VGA IO memory space not
allocated, same for the MMIO space (at HVM_BELOW_4G_MMIO_START of size
HVM_BELOW_4G_MMIO_LENGTH).

So to reflect that, we do not register the physical memory for this two
holes. But we still keep only one RAMBlock for the all RAM as it is more
easier than have two separate blocks (1 above 4G). Also this prevent QEMU
from use the MMIO space for a ROM.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
2011-07-26 06:57:55 +02:00

980 lines
28 KiB
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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 "range.h"
#include "xen-mapcache.h"
#include "trace.h"
#include <xen/hvm/ioreq.h>
#include <xen/hvm/params.h>
#include <xen/hvm/e820.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 XenPhysmap {
target_phys_addr_t start_addr;
ram_addr_t size;
target_phys_addr_t phys_offset;
QLIST_ENTRY(XenPhysmap) list;
} XenPhysmap;
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;
CPUPhysMemoryClient client;
QLIST_HEAD(, XenPhysmap) physmap;
const XenPhysmap *log_for_dirtybit;
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;
if (ram_size >= HVM_BELOW_4G_RAM_END) {
/* Xen does not allocate the memory continuously, and keep a hole at
* HVM_BELOW_4G_MMIO_START of HVM_BELOW_4G_MMIO_LENGTH
*/
new_block->length += HVM_BELOW_4G_MMIO_LENGTH;
}
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 >= HVM_BELOW_4G_RAM_END) {
above_4g_mem_size = ram_size - HVM_BELOW_4G_RAM_END;
below_4g_mem_size = HVM_BELOW_4G_RAM_END;
} else {
below_4g_mem_size = ram_size;
}
cpu_register_physical_memory(0, 0xa0000, 0);
/* Skip of the VGA IO memory space, it will be registered later by the VGA
* emulated device.
*
* The area between 0xc0000 and 0x100000 will be used by SeaBIOS to load
* the Options ROM, so it is registered here as RAM.
*/
cpu_register_physical_memory(0xc0000, below_4g_mem_size - 0xc0000,
0xc0000);
if (above_4g_mem_size > 0) {
cpu_register_physical_memory(0x100000000ULL, above_4g_mem_size,
0x100000000ULL);
}
}
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 " RAM_ADDR_FMT, ram_addr);
}
qemu_free(pfn_list);
}
static XenPhysmap *get_physmapping(XenIOState *state,
target_phys_addr_t start_addr, ram_addr_t size)
{
XenPhysmap *physmap = NULL;
start_addr &= TARGET_PAGE_MASK;
QLIST_FOREACH(physmap, &state->physmap, list) {
if (range_covers_byte(physmap->start_addr, physmap->size, start_addr)) {
return physmap;
}
}
return NULL;
}
#if CONFIG_XEN_CTRL_INTERFACE_VERSION >= 340
static int xen_add_to_physmap(XenIOState *state,
target_phys_addr_t start_addr,
ram_addr_t size,
target_phys_addr_t phys_offset)
{
unsigned long i = 0;
int rc = 0;
XenPhysmap *physmap = NULL;
target_phys_addr_t pfn, start_gpfn;
RAMBlock *block;
if (get_physmapping(state, start_addr, size)) {
return 0;
}
if (size <= 0) {
return -1;
}
/* Xen can only handle a single dirty log region for now and we want
* the linear framebuffer to be that region.
* Avoid tracking any regions that is not videoram and avoid tracking
* the legacy vga region. */
QLIST_FOREACH(block, &ram_list.blocks, next) {
if (!strcmp(block->idstr, "vga.vram") && block->offset == phys_offset
&& start_addr > 0xbffff) {
goto go_physmap;
}
}
return -1;
go_physmap:
DPRINTF("mapping vram to %llx - %llx, from %llx\n",
start_addr, start_addr + size, phys_offset);
pfn = phys_offset >> TARGET_PAGE_BITS;
start_gpfn = start_addr >> TARGET_PAGE_BITS;
for (i = 0; i < size >> TARGET_PAGE_BITS; i++) {
unsigned long idx = pfn + i;
xen_pfn_t gpfn = start_gpfn + i;
rc = xc_domain_add_to_physmap(xen_xc, xen_domid, XENMAPSPACE_gmfn, idx, gpfn);
if (rc) {
DPRINTF("add_to_physmap MFN %"PRI_xen_pfn" to PFN %"
PRI_xen_pfn" failed: %d\n", idx, gpfn, rc);
return -rc;
}
}
physmap = qemu_malloc(sizeof (XenPhysmap));
physmap->start_addr = start_addr;
physmap->size = size;
physmap->phys_offset = phys_offset;
QLIST_INSERT_HEAD(&state->physmap, physmap, list);
xc_domain_pin_memory_cacheattr(xen_xc, xen_domid,
start_addr >> TARGET_PAGE_BITS,
(start_addr + size) >> TARGET_PAGE_BITS,
XEN_DOMCTL_MEM_CACHEATTR_WB);
return 0;
}
static int xen_remove_from_physmap(XenIOState *state,
target_phys_addr_t start_addr,
ram_addr_t size)
{
unsigned long i = 0;
int rc = 0;
XenPhysmap *physmap = NULL;
target_phys_addr_t phys_offset = 0;
physmap = get_physmapping(state, start_addr, size);
if (physmap == NULL) {
return -1;
}
phys_offset = physmap->phys_offset;
size = physmap->size;
DPRINTF("unmapping vram to %llx - %llx, from %llx\n",
phys_offset, phys_offset + size, start_addr);
size >>= TARGET_PAGE_BITS;
start_addr >>= TARGET_PAGE_BITS;
phys_offset >>= TARGET_PAGE_BITS;
for (i = 0; i < size; i++) {
unsigned long idx = start_addr + i;
xen_pfn_t gpfn = phys_offset + i;
rc = xc_domain_add_to_physmap(xen_xc, xen_domid, XENMAPSPACE_gmfn, idx, gpfn);
if (rc) {
fprintf(stderr, "add_to_physmap MFN %"PRI_xen_pfn" to PFN %"
PRI_xen_pfn" failed: %d\n", idx, gpfn, rc);
return -rc;
}
}
QLIST_REMOVE(physmap, list);
if (state->log_for_dirtybit == physmap) {
state->log_for_dirtybit = NULL;
}
free(physmap);
return 0;
}
#else
static int xen_add_to_physmap(XenIOState *state,
target_phys_addr_t start_addr,
ram_addr_t size,
target_phys_addr_t phys_offset)
{
return -ENOSYS;
}
static int xen_remove_from_physmap(XenIOState *state,
target_phys_addr_t start_addr,
ram_addr_t size)
{
return -ENOSYS;
}
#endif
static void xen_client_set_memory(struct CPUPhysMemoryClient *client,
target_phys_addr_t start_addr,
ram_addr_t size,
ram_addr_t phys_offset,
bool log_dirty)
{
XenIOState *state = container_of(client, XenIOState, client);
ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK;
hvmmem_type_t mem_type;
if (!(start_addr != phys_offset
&& ( (log_dirty && flags < IO_MEM_UNASSIGNED)
|| (!log_dirty && flags == IO_MEM_UNASSIGNED)))) {
return;
}
trace_xen_client_set_memory(start_addr, size, phys_offset, log_dirty);
start_addr &= TARGET_PAGE_MASK;
size = TARGET_PAGE_ALIGN(size);
phys_offset &= TARGET_PAGE_MASK;
switch (flags) {
case IO_MEM_RAM:
xen_add_to_physmap(state, start_addr, size, phys_offset);
break;
case IO_MEM_ROM:
mem_type = HVMMEM_ram_ro;
if (xc_hvm_set_mem_type(xen_xc, xen_domid, mem_type,
start_addr >> TARGET_PAGE_BITS,
size >> TARGET_PAGE_BITS)) {
DPRINTF("xc_hvm_set_mem_type error, addr: "TARGET_FMT_plx"\n",
start_addr);
}
break;
case IO_MEM_UNASSIGNED:
if (xen_remove_from_physmap(state, start_addr, size) < 0) {
DPRINTF("physmapping does not exist at "TARGET_FMT_plx"\n", start_addr);
}
break;
}
}
static int xen_sync_dirty_bitmap(XenIOState *state,
target_phys_addr_t start_addr,
ram_addr_t size)
{
target_phys_addr_t npages = size >> TARGET_PAGE_BITS;
target_phys_addr_t vram_offset = 0;
const int width = sizeof(unsigned long) * 8;
unsigned long bitmap[(npages + width - 1) / width];
int rc, i, j;
const XenPhysmap *physmap = NULL;
physmap = get_physmapping(state, start_addr, size);
if (physmap == NULL) {
/* not handled */
return -1;
}
if (state->log_for_dirtybit == NULL) {
state->log_for_dirtybit = physmap;
} else if (state->log_for_dirtybit != physmap) {
return -1;
}
vram_offset = physmap->phys_offset;
rc = xc_hvm_track_dirty_vram(xen_xc, xen_domid,
start_addr >> TARGET_PAGE_BITS, npages,
bitmap);
if (rc) {
return rc;
}
for (i = 0; i < ARRAY_SIZE(bitmap); i++) {
unsigned long map = bitmap[i];
while (map != 0) {
j = ffsl(map) - 1;
map &= ~(1ul << j);
cpu_physical_memory_set_dirty(vram_offset + (i * width + j) * TARGET_PAGE_SIZE);
};
}
return 0;
}
static int xen_log_start(CPUPhysMemoryClient *client, target_phys_addr_t phys_addr, ram_addr_t size)
{
XenIOState *state = container_of(client, XenIOState, client);
return xen_sync_dirty_bitmap(state, phys_addr, size);
}
static int xen_log_stop(CPUPhysMemoryClient *client, target_phys_addr_t phys_addr, ram_addr_t size)
{
XenIOState *state = container_of(client, XenIOState, client);
state->log_for_dirtybit = NULL;
/* Disable dirty bit tracking */
return xc_hvm_track_dirty_vram(xen_xc, xen_domid, 0, 0, NULL);
}
static int xen_client_sync_dirty_bitmap(struct CPUPhysMemoryClient *client,
target_phys_addr_t start_addr,
target_phys_addr_t end_addr)
{
XenIOState *state = container_of(client, XenIOState, client);
return xen_sync_dirty_bitmap(state, start_addr, end_addr - start_addr);
}
static int xen_client_migration_log(struct CPUPhysMemoryClient *client,
int enable)
{
return 0;
}
static CPUPhysMemoryClient xen_cpu_phys_memory_client = {
.set_memory = xen_client_set_memory,
.sync_dirty_bitmap = xen_client_sync_dirty_bitmap,
.migration_log = xen_client_migration_log,
.log_start = xen_log_start,
.log_stop = xen_log_stop,
};
/* 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:
xen_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(VMRESET_REPORT);
}
}
req->state = STATE_IORESP_READY;
xc_evtchn_notify(state->xce_handle, state->ioreq_local_port[state->send_vcpu]);
}
}
static int store_dev_info(int domid, CharDriverState *cs, const char *string)
{
struct xs_handle *xs = NULL;
char *path = NULL;
char *newpath = NULL;
char *pts = NULL;
int ret = -1;
/* Only continue if we're talking to a pty. */
if (strncmp(cs->filename, "pty:", 4)) {
return 0;
}
pts = cs->filename + 4;
/* We now have everything we need to set the xenstore entry. */
xs = xs_open(0);
if (xs == NULL) {
fprintf(stderr, "Could not contact XenStore\n");
goto out;
}
path = xs_get_domain_path(xs, domid);
if (path == NULL) {
fprintf(stderr, "xs_get_domain_path() error\n");
goto out;
}
newpath = realloc(path, (strlen(path) + strlen(string) +
strlen("/tty") + 1));
if (newpath == NULL) {
fprintf(stderr, "realloc error\n");
goto out;
}
path = newpath;
strcat(path, string);
strcat(path, "/tty");
if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) {
fprintf(stderr, "xs_write for '%s' fail", string);
goto out;
}
ret = 0;
out:
free(path);
xs_close(xs);
return ret;
}
void xenstore_store_pv_console_info(int i, CharDriverState *chr)
{
if (i == 0) {
store_dev_info(xen_domid, chr, "/console");
} else {
char buf[32];
snprintf(buf, sizeof(buf), "/device/console/%d", i);
store_dev_info(xen_domid, chr, buf);
}
}
static void xenstore_record_dm_state(struct xs_handle *xs, const char *state)
{
char path[50];
if (xs == NULL) {
fprintf(stderr, "xenstore connection not initialized\n");
exit(1);
}
snprintf(path, sizeof (path), "/local/domain/0/device-model/%u/state", xen_domid);
if (!xs_write(xs, 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);
}
}
/* Initialise Xen */
static void xen_change_state_handler(void *opaque, int running, int reason)
{
if (running) {
/* record state running */
xenstore_record_dm_state(xenstore, "running");
}
}
static void xen_hvm_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, void *data)
{
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;
}
qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
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 */
xen_map_cache_init();
xen_ram_init(ram_size);
qemu_add_vm_change_state_handler(xen_hvm_change_state_handler, state);
state->client = xen_cpu_phys_memory_client;
QLIST_INIT(&state->physmap);
cpu_register_phys_memory_client(&state->client);
state->log_for_dirtybit = NULL;
/* Initialize backend core & drivers */
if (xen_be_init() != 0) {
fprintf(stderr, "%s: xen backend core setup failed\n", __FUNCTION__);
exit(1);
}
xen_be_register("console", &xen_console_ops);
xen_be_register("vkbd", &xen_kbdmouse_ops);
xen_be_register("qdisk", &xen_blkdev_ops);
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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