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qemu/hw/xen_domainbuild.c

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#include <signal.h>
#include "xen_backend.h"
#include "xen_domainbuild.h"
#include "sysemu.h"
#include "qemu-timer.h"
#include <xenguest.h>
static int xenstore_domain_mkdir(char *path)
{
struct xs_permissions perms_ro[] = {{
.id = 0, /* set owner: dom0 */
},{
.id = xen_domid,
.perms = XS_PERM_READ,
}};
struct xs_permissions perms_rw[] = {{
.id = 0, /* set owner: dom0 */
},{
.id = xen_domid,
.perms = XS_PERM_READ | XS_PERM_WRITE,
}};
const char *writable[] = { "device", "control", "error", NULL };
char subpath[256];
int i;
if (!xs_mkdir(xenstore, 0, path)) {
fprintf(stderr, "%s: xs_mkdir %s: failed\n", __FUNCTION__, path);
return -1;
}
if (!xs_set_permissions(xenstore, 0, path, perms_ro, 2)) {
fprintf(stderr, "%s: xs_set_permissions failed\n", __FUNCTION__);
return -1;
}
for (i = 0; writable[i]; i++) {
snprintf(subpath, sizeof(subpath), "%s/%s", path, writable[i]);
if (!xs_mkdir(xenstore, 0, subpath)) {
fprintf(stderr, "%s: xs_mkdir %s: failed\n", __FUNCTION__, subpath);
return -1;
}
if (!xs_set_permissions(xenstore, 0, subpath, perms_rw, 2)) {
fprintf(stderr, "%s: xs_set_permissions failed\n", __FUNCTION__);
return -1;
}
}
return 0;
}
int xenstore_domain_init1(const char *kernel, const char *ramdisk,
const char *cmdline)
{
char *dom, uuid_string[42], vm[256], path[256];
int i;
snprintf(uuid_string, sizeof(uuid_string), UUID_FMT,
qemu_uuid[0], qemu_uuid[1], qemu_uuid[2], qemu_uuid[3],
qemu_uuid[4], qemu_uuid[5], qemu_uuid[6], qemu_uuid[7],
qemu_uuid[8], qemu_uuid[9], qemu_uuid[10], qemu_uuid[11],
qemu_uuid[12], qemu_uuid[13], qemu_uuid[14], qemu_uuid[15]);
dom = xs_get_domain_path(xenstore, xen_domid);
snprintf(vm, sizeof(vm), "/vm/%s", uuid_string);
xenstore_domain_mkdir(dom);
xenstore_write_str(vm, "image/ostype", "linux");
if (kernel)
xenstore_write_str(vm, "image/kernel", kernel);
if (ramdisk)
xenstore_write_str(vm, "image/ramdisk", ramdisk);
if (cmdline)
xenstore_write_str(vm, "image/cmdline", cmdline);
/* name + id */
xenstore_write_str(vm, "name", qemu_name ? qemu_name : "no-name");
xenstore_write_str(vm, "uuid", uuid_string);
xenstore_write_str(dom, "name", qemu_name ? qemu_name : "no-name");
xenstore_write_int(dom, "domid", xen_domid);
xenstore_write_str(dom, "vm", vm);
/* memory */
xenstore_write_int(dom, "memory/target", ram_size >> 10); // kB
xenstore_write_int(vm, "memory", ram_size >> 20); // MB
xenstore_write_int(vm, "maxmem", ram_size >> 20); // MB
/* cpus */
for (i = 0; i < smp_cpus; i++) {
snprintf(path, sizeof(path), "cpu/%d/availability",i);
xenstore_write_str(dom, path, "online");
}
xenstore_write_int(vm, "vcpu_avail", smp_cpus);
xenstore_write_int(vm, "vcpus", smp_cpus);
/* vnc password */
xenstore_write_str(vm, "vncpassword", "" /* FIXME */);
free(dom);
return 0;
}
int xenstore_domain_init2(int xenstore_port, int xenstore_mfn,
int console_port, int console_mfn)
{
char *dom;
dom = xs_get_domain_path(xenstore, xen_domid);
/* signal new domain */
xs_introduce_domain(xenstore,
xen_domid,
xenstore_mfn,
xenstore_port);
/* xenstore */
xenstore_write_int(dom, "store/ring-ref", xenstore_mfn);
xenstore_write_int(dom, "store/port", xenstore_port);
/* console */
xenstore_write_str(dom, "console/type", "ioemu");
xenstore_write_int(dom, "console/limit", 128 * 1024);
xenstore_write_int(dom, "console/ring-ref", console_mfn);
xenstore_write_int(dom, "console/port", console_port);
xen_config_dev_console(0);
free(dom);
return 0;
}
/* ------------------------------------------------------------- */
static QEMUTimer *xen_poll;
/* check domain state once per second */
static void xen_domain_poll(void *opaque)
{
struct xc_dominfo info;
int rc;
rc = xc_domain_getinfo(xen_xc, xen_domid, 1, &info);
if ((rc != 1) || (info.domid != xen_domid)) {
qemu_log("xen: domain %d is gone\n", xen_domid);
goto quit;
}
if (info.dying) {
qemu_log("xen: domain %d is dying (%s%s)\n", xen_domid,
info.crashed ? "crashed" : "",
info.shutdown ? "shutdown" : "");
goto quit;
}
qemu_mod_timer(xen_poll, qemu_get_clock(rt_clock) + 1000);
return;
quit:
qemu_system_shutdown_request();
return;
}
static void xen_domain_watcher(void)
{
int qemu_running = 1;
int fd[2], i, n, rc;
char byte;
pipe(fd);
if (fork() != 0)
return; /* not child */
/* close all file handles, except stdio/out/err,
* our watch pipe and the xen interface handle */
n = getdtablesize();
for (i = 3; i < n; i++) {
if (i == fd[0])
continue;
if (i == xen_xc)
continue;
close(i);
}
/* ignore term signals */
signal(SIGINT, SIG_IGN);
signal(SIGTERM, SIG_IGN);
/* wait for qemu exiting */
while (qemu_running) {
rc = read(fd[0], &byte, 1);
switch (rc) {
case -1:
if (errno == EINTR)
continue;
qemu_log("%s: Huh? read error: %s\n", __FUNCTION__, strerror(errno));
qemu_running = 0;
break;
case 0:
/* EOF -> qemu exited */
qemu_running = 0;
break;
default:
qemu_log("%s: Huh? data on the watch pipe?\n", __FUNCTION__);
break;
}
}
/* cleanup */
qemu_log("%s: destroy domain %d\n", __FUNCTION__, xen_domid);
xc_domain_destroy(xen_xc, xen_domid);
_exit(0);
}
/* normal cleanup */
static void xen_domain_cleanup(void)
{
char *dom;
dom = xs_get_domain_path(xenstore, xen_domid);
if (dom) {
xs_rm(xenstore, 0, dom);
free(dom);
}
xs_release_domain(xenstore, xen_domid);
}
int xen_domain_build_pv(const char *kernel, const char *ramdisk,
const char *cmdline)
{
uint32_t ssidref = 0;
uint32_t flags = 0;
xen_domain_handle_t uuid;
unsigned int xenstore_port = 0, console_port = 0;
unsigned long xenstore_mfn = 0, console_mfn = 0;
int rc;
memcpy(uuid, qemu_uuid, sizeof(uuid));
rc = xc_domain_create(xen_xc, ssidref, uuid, flags, &xen_domid);
if (rc < 0) {
fprintf(stderr, "xen: xc_domain_create() failed\n");
goto err;
}
qemu_log("xen: created domain %d\n", xen_domid);
atexit(xen_domain_cleanup);
xen_domain_watcher();
xenstore_domain_init1(kernel, ramdisk, cmdline);
rc = xc_domain_max_vcpus(xen_xc, xen_domid, smp_cpus);
if (rc < 0) {
fprintf(stderr, "xen: xc_domain_max_vcpus() failed\n");
goto err;
}
#if 0
rc = xc_domain_setcpuweight(xen_xc, xen_domid, 256);
if (rc < 0) {
fprintf(stderr, "xen: xc_domain_setcpuweight() failed\n");
goto err;
}
#endif
rc = xc_domain_setmaxmem(xen_xc, xen_domid, ram_size >> 10);
if (rc < 0) {
fprintf(stderr, "xen: xc_domain_setmaxmem() failed\n");
goto err;
}
xenstore_port = xc_evtchn_alloc_unbound(xen_xc, xen_domid, 0);
console_port = xc_evtchn_alloc_unbound(xen_xc, xen_domid, 0);
rc = xc_linux_build(xen_xc, xen_domid, ram_size >> 20,
kernel, ramdisk, cmdline,
0, flags,
xenstore_port, &xenstore_mfn,
console_port, &console_mfn);
if (rc < 0) {
fprintf(stderr, "xen: xc_linux_build() failed\n");
goto err;
}
xenstore_domain_init2(xenstore_port, xenstore_mfn,
console_port, console_mfn);
qemu_log("xen: unpausing domain %d\n", xen_domid);
rc = xc_domain_unpause(xen_xc, xen_domid);
if (rc < 0) {
fprintf(stderr, "xen: xc_domain_unpause() failed\n");
goto err;
}
xen_poll = qemu_new_timer(rt_clock, xen_domain_poll, NULL);
qemu_mod_timer(xen_poll, qemu_get_clock(rt_clock) + 1000);
return 0;
err:
return -1;
}
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