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[Qemu-devel] [PATCH] target-i386: add a list of enforceable CPU models t
From: |
Peter Lieven |
Subject: |
[Qemu-devel] [PATCH] target-i386: add a list of enforceable CPU models to the help output |
Date: |
Mon, 24 Aug 2015 11:17:04 +0200 |
this patch adds a probe that lists all enforceable and migrateable
CPU models to the -cpu help output. The idea is to know a priory
which CPU modules can be exposed to the user without loosing any
feature flags.
Signed-off-by: Peter Lieven <address@hidden>
---
target-i386/cpu.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 49 insertions(+)
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index cfb8aa7..3a56d3f 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -1961,6 +1961,45 @@ static void listflags(FILE *f, fprintf_function print,
const char **featureset)
}
}
+/*
+ * Check if the CPU Definition is enforcable on the current host CPU
+ * and contains no unmigratable flags.
+ *
+ * Returns: true if the CPU can be enforced and migrated.
+ */
+static bool x86_cpu_enforce_and_migratable(X86CPUDefinition *def)
+{
+ int i;
+ for (i = 0; i < ARRAY_SIZE(feature_word_info); i++) {
+ FeatureWordInfo *fw = &feature_word_info[i];
+ uint32_t eax, ebx, ecx, edx, host;
+ host_cpuid(fw->cpuid_eax, 0, &eax, &ebx, &ecx, &edx);
+ switch (fw->cpuid_reg) {
+ case R_EAX:
+ host = eax;
+ break;
+ case R_EBX:
+ host = ebx;
+ break;
+ case R_ECX:
+ host = ecx;
+ break;
+ case R_EDX:
+ host = edx;
+ break;
+ default:
+ return false;
+ }
+ if (def->features[i] & ~host) {
+ return false;
+ }
+ if (def->features[i] & fw->unmigratable_flags) {
+ return false;
+ }
+ }
+ return true;
+}
+
/* generate CPU information. */
void x86_cpu_list(FILE *f, fprintf_function cpu_fprintf)
{
@@ -1987,6 +2026,16 @@ void x86_cpu_list(FILE *f, fprintf_function cpu_fprintf)
listflags(f, cpu_fprintf, fw->feat_names);
(*cpu_fprintf)(f, "\n");
}
+
+ (*cpu_fprintf)(f, "\nEnforceable and migratable x86 CPU models in KVM
mode:\n");
+ (*cpu_fprintf)(f, " ");
+ for (i = 0; i < ARRAY_SIZE(builtin_x86_defs); i++) {
+ def = &builtin_x86_defs[i];
+ if (x86_cpu_enforce_and_migratable(def)) {
+ (*cpu_fprintf)(f, " %s", def->name);
+ }
+ }
+ (*cpu_fprintf)(f, "\n");
}
CpuDefinitionInfoList *arch_query_cpu_definitions(Error **errp)
--
1.9.1
- [Qemu-devel] [PATCH] target-i386: add a list of enforceable CPU models to the help output,
Peter Lieven <=