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target-i386: Support migratable=no properly

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When the "migratable" property was implemented, the behavior was tested
by changing the default on the code, but actually using the option on
the command-line (e.g. "-cpu host,migratable=false") doesn't work as
expected. This is a regression for a common use case of "-cpu host",
which is to enable features that are supported by the host CPU + kernel
before feature-specific code is added to QEMU.

Fix this by initializing the feature words for "-cpu host" on
x86_cpu_parse_featurestr(), right after parsing the CPU options.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Andreas Färber <afaerber@suse.de>
This commit is contained in:
Eduardo Habkost 2014-08-20 17:30:12 -03:00 committed by Andreas Färber
parent 6c3bff0ed8
commit 4d1b279b06
2 changed files with 16 additions and 8 deletions
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1
target-i386/cpu-qom.h
View file

@ -92,6 +92,7 @@ typedef struct X86CPU {
bool enforce_cpuid;
bool expose_kvm;
bool migratable;
bool host_features;
/* if true the CPUID code directly forward host cache leaves to the guest */
bool cache_info_passthrough;

23
target-i386/cpu.c
View file

@ -1254,6 +1254,9 @@ void x86_cpu_compat_set_features(const char *cpu_model, FeatureWord w,
}
}
static uint32_t x86_cpu_get_supported_feature_word(FeatureWord w,
bool migratable_only);
#ifdef CONFIG_KVM
static int cpu_x86_fill_model_id(char *str)
@ -1310,26 +1313,23 @@ static void host_x86_cpu_class_init(ObjectClass *oc, void *data)
dc->props = host_x86_cpu_properties;
}
static uint32_t x86_cpu_get_supported_feature_word(FeatureWord w,
bool migratable_only);
static void host_x86_cpu_initfn(Object *obj)
{
X86CPU *cpu = X86_CPU(obj);
CPUX86State *env = &cpu->env;
KVMState *s = kvm_state;
FeatureWord w;
assert(kvm_enabled());
/* We can't fill the features array here because we don't know yet if
* "migratable" is true or false.
*/
cpu->host_features = true;
env->cpuid_level = kvm_arch_get_supported_cpuid(s, 0x0, 0, R_EAX);
env->cpuid_xlevel = kvm_arch_get_supported_cpuid(s, 0x80000000, 0, R_EAX);
env->cpuid_xlevel2 = kvm_arch_get_supported_cpuid(s, 0xC0000000, 0, R_EAX);
for (w = 0; w < FEATURE_WORDS; w++) {
env->features[w] =
x86_cpu_get_supported_feature_word(w, cpu->migratable);
}
object_property_set_bool(OBJECT(cpu), true, "pmu", &error_abort);
}
@ -1828,6 +1828,13 @@ static void x86_cpu_parse_featurestr(CPUState *cs, char *features,
featurestr = strtok(NULL, ",");
}
if (cpu->host_features) {
for (w = 0; w < FEATURE_WORDS; w++) {
env->features[w] =
x86_cpu_get_supported_feature_word(w, cpu->migratable);
}
}
for (w = 0; w < FEATURE_WORDS; w++) {
env->features[w] |= plus_features[w];
env->features[w] &= ~minus_features[w];