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target-ppc: Give a meaningful error if too many threads are specified

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Currently the target-ppc tcg code only supports a single thread.  You can
specify more, but they're treated identically to multiple cores.  On KVM
we obviously can't support more threads than the hardware; if more are
specified it will cause strange and cryptic errors.

This patch clarifies the situation by giving a simple meaningful error if
more threads are specified than we can support.

Signed-off-by: Mike Qiu <qiudayu@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Mike Qiu 2013-01-23 17:20:38 +00:00 committed by Alexander Graf
parent 293c867d8c
commit fe828a4d4b
1 changed files with 12 additions and 0 deletions
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12
target-ppc/translate_init.c
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@ -28,6 +28,7 @@
#include <sysemu/kvm.h>
#include "kvm_ppc.h"
#include "sysemu/arch_init.h"
#include "sysemu/cpus.h"
//#define PPC_DUMP_CPU
//#define PPC_DEBUG_SPR
@ -10036,6 +10037,17 @@ static void ppc_cpu_realize(Object *obj, Error **errp)
PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
ppc_def_t *def = pcc->info;
Error *local_err = NULL;
#if !defined(CONFIG_USER_ONLY)
int max_smt = kvm_enabled() ? kvmppc_smt_threads() : 1;
#endif
#if !defined(CONFIG_USER_ONLY)
if (smp_threads > max_smt) {
fprintf(stderr, "Cannot support more than %d threads on PPC with %s\n",
max_smt, kvm_enabled() ? "KVM" : "TCG");
exit(1);
}
#endif
if (kvm_enabled()) {
if (kvmppc_fixup_cpu(cpu) != 0) {