From: Anthony PERARD <anthony.perard@xxxxxxxxxx>
This option gives the ability to switch one "accelerator" like kvm, xen
or the default one tcg. We can specify more than one accelerator by
separate them by a comma. QEMU will try each one and use the first whose
works.
So,
-accel xen,kvm,tcg
which would try Xen support first, then KVM and finaly tcg if none of
the other works.
Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
qemu-options.hx | 10 ++++++
vl.c | 86 ++++++++++++++++++++++++++++++++++++++++++++++++-------
2 files changed, 85 insertions(+), 11 deletions(-)
diff --git a/qemu-options.hx b/qemu-options.hx
index a0b5ae9..53c4d35 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -1904,6 +1904,16 @@ Enable KVM full virtualization support. This option is
only available
if KVM support is enabled when compiling.
ETEXI
+DEF("accel", HAS_ARG, QEMU_OPTION_accel, \
+ "-accel accel use an accelerator (kvm,xen,tcg), default is tcg\n",
QEMU_ARCH_ALL)
+STEXI
+@item -accel @var{accel}[,@var{accel}[,...]]
+@findex -accel
+This is use to enable an accelerator, in kvm,xen,tcg.
+By default, it use only tcg. If there a more than one accelerator
+specified, the next one is used if the first don't work.
+ETEXI
+
DEF("xen-domid", HAS_ARG, QEMU_OPTION_xen_domid,
"-xen-domid id specify xen guest domain id\n", QEMU_ARCH_ALL)
DEF("xen-create", 0, QEMU_OPTION_xen_create,
diff --git a/vl.c b/vl.c
index d352d18..475efe0 100644
--- a/vl.c
+++ b/vl.c
@@ -1744,6 +1744,74 @@ static int debugcon_parse(const char *devname)
return 0;
}
+static struct {
+ const char *opt_name;
+ const char *name;
+ int (*available)(void);
+ int (*init)(int smp_cpus);
+ int *allowed;
+} accel_list[] = {
+ { "tcg", "tcg", NULL, NULL, NULL },
+ { "kvm", "KVM", kvm_available, kvm_init, &kvm_allowed },
+};
+
+static int accel_parse_init(const char *opts)
+{
+ const char *p = opts;
+ char buf[10];
+ int i, ret;
+ bool accel_initalised = 0;
+ bool init_failed = 0;
+
+ while (!accel_initalised && *p != '\0') {
+ if (*p == ',') {
+ p++;
+ }
+ p = get_opt_name(buf, sizeof (buf), p, ',');
+ for (i = 0; i < ARRAY_SIZE(accel_list); i++) {
+ if (strcmp(accel_list[i].opt_name, buf) == 0) {
+ if (accel_list[i].init) {
+ ret = accel_list[i].init(smp_cpus);
+ } else {
+ ret = 0;
+ }
+ if (ret < 0) {
+ init_failed = 1;
+ if (!accel_list[i].available()) {
+ printf("%s not supported for this target\n",
+ accel_list[i].name);
+ } else {
+ fprintf(stderr, "failed to initialize %s: %s\n",
+ accel_list[i].name,
+ strerror(-ret));
+ }
+ } else {
+ accel_initalised = 1;
+ if (accel_list[i].allowed) {
+ *(accel_list[i].allowed) = 1;
+ }
+ }
+ break;
+ }
+ }
+ if (i == ARRAY_SIZE(accel_list) + 1) {
+ fprintf(stderr, "\"%s\" accelerator does not exist.\n", buf);
+ exit(1);
+ }
+ }
+
+ if (!accel_initalised) {
+ fprintf(stderr, "No accelerator found!\n");
+ exit(1);
+ }
+
+ if (init_failed) {
+ fprintf(stderr, "Back to %s accelerator.\n", accel_list[i].name);
+ }
+
+ return !accel_initalised;
+}
+
void qemu_add_exit_notifier(Notifier *notify)
{
notifier_list_add(&exit_notifiers, notify);
@@ -1823,6 +1891,7 @@ int main(int argc, char **argv, char **envp)
const char *incoming = NULL;
int show_vnc_port = 0;
int defconfig = 1;
+ const char *accel_list_opts = "tcg";
#ifdef CONFIG_SIMPLE_TRACE
const char *trace_file = NULL;
@@ -2443,7 +2512,10 @@ int main(int argc, char **argv, char **envp)
do_smbios_option(optarg);
break;
case QEMU_OPTION_enable_kvm:
- kvm_allowed = 1;
+ accel_list_opts = "kvm";
+ break;
+ case QEMU_OPTION_accel:
+ accel_list_opts = optarg;
break;
case QEMU_OPTION_usb:
usb_enabled = 1;
@@ -2741,16 +2813,8 @@ int main(int argc, char **argv, char **envp)
exit(1);
}
- if (kvm_allowed) {
- int ret = kvm_init(smp_cpus);
- if (ret < 0) {
- if (!kvm_available()) {
- printf("KVM not supported for this target\n");
- } else {
- fprintf(stderr, "failed to initialize KVM: %s\n",
strerror(-ret));
- }
- exit(1);
- }
+ if (accel_list_opts) {
+ accel_parse_init(accel_list_opts);
}
if (qemu_init_main_loop()) {
--
1.7.1
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