qemu/hw/xen_domainbuild.c
Anthony PERARD d5b93ddfef xen: Support new libxc calls from xen unstable.
This patch updates the libxenctrl calls in Qemu to use the new interface,
otherwise Qemu wouldn't be able to build against new versions of the
library.

We check libxenctrl version in configure, from Xen 3.3.0 to Xen
unstable.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
2011-05-08 10:09:59 +02:00

301 lines
8.5 KiB
C

#include <signal.h>
#include "xen_backend.h"
#include "xen_domainbuild.h"
#include "qemu-timer.h"
#include "qemu-log.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_ms(rt_clock) + 1000);
return;
quit:
qemu_system_shutdown_request();
return;
}
static int xen_domain_watcher(void)
{
int qemu_running = 1;
int fd[2], i, n, rc;
char byte;
if (pipe(fd) != 0) {
qemu_log("%s: Huh? pipe error: %s\n", __FUNCTION__, strerror(errno));
return -1;
}
if (fork() != 0)
return 0; /* 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 == xc_fd(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);
if (xen_domain_watcher() == -1) {
goto err;
}
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_ms(rt_clock, xen_domain_poll, NULL);
qemu_mod_timer(xen_poll, qemu_get_clock_ms(rt_clock) + 1000);
return 0;
err:
return -1;
}