This property will contain all the features that were removed from the
CPU because they are not supported by the host.
This way, libvirt or other management tools can emulate the
check/enforce behavior by checking if filtered-properties is all zeroes,
before starting the guest.
Example output where some features were missing:
$ ./install/bin/qemu-system-x86_64 -enable-kvm -cpu Haswell,check -S -qmp unix:/tmp/m,server,nowait
warning: host doesn't support requested feature: CPUID.01H:ECX.fma [bit 12]
warning: host doesn't support requested feature: CPUID.01H:ECX.movbe [bit 22]
warning: host doesn't support requested feature: CPUID.01H:ECX.tsc-deadline [bit 24]
warning: host doesn't support requested feature: CPUID.01H:ECX.xsave [bit 26]
warning: host doesn't support requested feature: CPUID.01H:ECX.avx [bit 28]
warning: host doesn't support requested feature: CPUID.07H:EBX.fsgsbase [bit 0]
warning: host doesn't support requested feature: CPUID.07H:EBX.bmi1 [bit 3]
warning: host doesn't support requested feature: CPUID.07H:EBX.hle [bit 4]
warning: host doesn't support requested feature: CPUID.07H:EBX.avx2 [bit 5]
warning: host doesn't support requested feature: CPUID.07H:EBX.smep [bit 7]
warning: host doesn't support requested feature: CPUID.07H:EBX.bmi2 [bit 8]
warning: host doesn't support requested feature: CPUID.07H:EBX.erms [bit 9]
warning: host doesn't support requested feature: CPUID.07H:EBX.invpcid [bit 10]
warning: host doesn't support requested feature: CPUID.07H:EBX.rtm [bit 11]
[...]
$ ./QMP/qmp --path=/tmp/m qom-get --path=/machine/unattached/device[1] --property=filtered-features
item[0].cpuid-register: EDX
item[0].cpuid-input-eax: 2147483658
item[0].features: 0
item[1].cpuid-register: EAX
item[1].cpuid-input-eax: 1073741825
item[1].features: 0
item[2].cpuid-register: EDX
item[2].cpuid-input-eax: 3221225473
item[2].features: 0
item[3].cpuid-register: ECX
item[3].cpuid-input-eax: 2147483649
item[3].features: 0
item[4].cpuid-register: EDX
item[4].cpuid-input-eax: 2147483649
item[4].features: 0
item[5].cpuid-register: EBX
item[5].cpuid-input-eax: 7
item[5].features: 4025
item[5].cpuid-input-ecx: 0
item[6].cpuid-register: ECX
item[6].cpuid-input-eax: 1
item[6].features: 356519936
item[7].cpuid-register: EDX
item[7].cpuid-input-eax: 1
item[7].features: 0
Example output when no feature is missing:
$ ./install/bin/qemu-system-x86_64 -enable-kvm -cpu Nehalem,enforce -S -qmp unix:/tmp/m,server,nowait
[...]
$ ./QMP/qmp --path=/tmp/m qom-get --path=/machine/unattached/device[1]
--property=filtered-features
item[0].cpuid-register: EDX
item[0].cpuid-input-eax: 2147483658
item[0].features: 0
item[1].cpuid-register: EAX
item[1].cpuid-input-eax: 1073741825
item[1].features: 0
item[2].cpuid-register: EDX
item[2].cpuid-input-eax: 3221225473
item[2].features: 0
item[3].cpuid-register: ECX
item[3].cpuid-input-eax: 2147483649
item[3].features: 0
item[4].cpuid-register: EDX
item[4].cpuid-input-eax: 2147483649
item[4].features: 0
item[5].cpuid-register: EBX
item[5].cpuid-input-eax: 7
item[5].features: 0
item[5].cpuid-input-ecx: 0
item[6].cpuid-register: ECX
item[6].cpuid-input-eax: 1
item[6].features: 0
item[7].cpuid-register: EDX
item[7].cpuid-input-eax: 1
item[7].features: 0
Signed-off-by: Eduardo Habkost <ehabkost@xxxxxxxxxx>
Reviewed-by: Eric Blake <eblake@xxxxxxxxxx>
---
Changes v11 -> v12:
* Rebase on top of qom-cpu-next
(commit bd87d2a - target-i386: Use FeatureWord loop on filter_features_for_kvm())
---
target-i386/cpu.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 38793bc..eb1825b 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -1418,11 +1418,11 @@ static void x86_cpuid_set_apic_id(Object *obj, Visitor *v, void *opaque,
cpu->env.cpuid_apic_id = value;
}
+/* Generic getter for "feature-words" and "filtered-features" properties */
static void x86_cpu_get_feature_words(Object *obj, Visitor *v, void *opaque,
const char *name, Error **errp)
{
- X86CPU *cpu = X86_CPU(obj);
- CPUX86State *env = &cpu->env;
+ uint32_t *array = (uint32_t *)opaque;
FeatureWord w;
Error *err = NULL;
X86CPUFeatureWordInfo word_infos[FEATURE_WORDS] = { };
@@ -1436,7 +1436,7 @@ static void x86_cpu_get_feature_words(Object *obj, Visitor *v, void *opaque,
qwi->has_cpuid_input_ecx = wi->cpuid_needs_ecx;
qwi->cpuid_input_ecx = wi->cpuid_ecx;
qwi->cpuid_register = x86_reg_info_32[wi->cpuid_reg].qapi_enum;
- qwi->features = env->features[w];
+ qwi->features = array[w];
/* List will be in reverse order, but order shouldn't matter */
list_entries[w].next = list;
@@ -2444,7 +2444,10 @@ static void x86_cpu_initfn(Object *obj)
x86_cpuid_set_apic_id, NULL, NULL, NULL);
object_property_add(obj, "feature-words", "X86CPUFeatureWordInfo",
x86_cpu_get_feature_words,
- NULL, NULL, NULL, NULL);
+ NULL, NULL, (void *)env->features, NULL);
+ object_property_add(obj, "filtered-features", "X86CPUFeatureWordInfo",
+ x86_cpu_get_feature_words,
+ NULL, NULL, (void *)cpu->filtered_features, NULL);
env->cpuid_apic_id = x86_cpu_apic_id_from_index(cs->cpu_index);
--
1.8.1.4
--
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