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accel: Improve selection of the default accelerator

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When compiling with "--disable-tcg", we currently still use "tcg"
as default accelerator. "kvm" should be used in this case instead.
Also, some downstream distros provide QEMU binaries which have "kvm"
in their names (e.g. "qemu-kvm" on RHEL or "kvm" on Ubuntu) that use
KVM by default - and some users might want to do something similar
with upstream binaries, too. Accomodate them by using "kvm:tcg" as
default when we detect such a binary name.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-Id: <1538748792-19444-1-git-send-email-thuth@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Thomas Huth 2018-10-05 16:13:12 +02:00 committed by Paolo Bonzini
parent a311f891ab
commit 98e56ae679
3 changed files with 17 additions and 5 deletions
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18
accel/accel.c
View File

@ -69,7 +69,7 @@ static int accel_init_machine(AccelClass *acc, MachineState *ms)
return ret;
}
void configure_accelerator(MachineState *ms)
void configure_accelerator(MachineState *ms, const char *progname)
{
const char *accel;
char **accel_list, **tmp;
@ -80,8 +80,20 @@ void configure_accelerator(MachineState *ms)
accel = qemu_opt_get(qemu_get_machine_opts(), "accel");
if (accel == NULL) {
/* Use the default "accelerator", tcg */
accel = "tcg";
/* Select the default accelerator */
int pnlen = strlen(progname);
if (pnlen >= 3 && g_str_equal(&progname[pnlen - 3], "kvm")) {
/* If the program name ends with "kvm", we prefer KVM */
accel = "kvm:tcg";
} else {
#if defined(CONFIG_TCG)
accel = "tcg";
#elif defined(CONFIG_KVM)
accel = "kvm";
#else
#error "No default accelerator available"
#endif
}
}
accel_list = g_strsplit(accel, ":", 0);

2
include/sysemu/accel.h
View File

@ -66,7 +66,7 @@ typedef struct AccelClass {
extern unsigned long tcg_tb_size;
void configure_accelerator(MachineState *ms);
void configure_accelerator(MachineState *ms, const char *progname);
/* Called just before os_setup_post (ie just before drop OS privs) */
void accel_setup_post(MachineState *ms);

2
vl.c
View File

@ -4329,7 +4329,7 @@ int main(int argc, char **argv, char **envp)
qemu_opt_foreach(machine_opts, machine_set_property, current_machine,
&error_fatal);
configure_accelerator(current_machine);
configure_accelerator(current_machine, argv[0]);
if (!qtest_enabled() && machine_class->deprecation_reason) {
error_report("Machine type '%s' is deprecated: %s",