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[Qemu-devel] [PULL 10/11] target-i386: Introduce generic CPUID feature c
From: |
Andreas Färber |
Subject: |
[Qemu-devel] [PULL 10/11] target-i386: Introduce generic CPUID feature compat function |
Date: |
Mon, 6 May 2013 22:43:30 +0200 |
From: Eduardo Habkost <address@hidden>
Introduce x86_cpu_compat_set_features(), that can be used to set/unset
feature bits on specific CPU models for machine-type compatibility.
Signed-off-by: Eduardo Habkost <address@hidden>
Signed-off-by: Andreas Färber <address@hidden>
---
target-i386/cpu.c | 26 ++++++++++++++++++++++++++
target-i386/cpu.h | 4 ++++
2 files changed, 30 insertions(+)
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 8e21c94..8198a1b 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -971,6 +971,32 @@ static x86_def_t builtin_x86_defs[] = {
},
};
+/**
+ * x86_cpu_compat_set_features:
+ * @cpu_model: CPU model name to be changed. If NULL, all CPU models are
changed
+ * @w: Identifies the feature word to be changed.
+ * @feat_add: Feature bits to be added to feature word
+ * @feat_remove: Feature bits to be removed from feature word
+ *
+ * Change CPU model feature bits for compatibility.
+ *
+ * This function may be used by machine-type compatibility functions
+ * to enable or disable feature bits on specific CPU models.
+ */
+void x86_cpu_compat_set_features(const char *cpu_model, FeatureWord w,
+ uint32_t feat_add, uint32_t feat_remove)
+{
+ x86_def_t *def;
+ int i;
+ for (i = 0; i < ARRAY_SIZE(builtin_x86_defs); i++) {
+ def = &builtin_x86_defs[i];
+ if (!cpu_model || !strcmp(cpu_model, def->name)) {
+ def->features[w] |= feat_add;
+ def->features[w] &= ~feat_remove;
+ }
+ }
+}
+
#ifdef CONFIG_KVM
static int cpu_x86_fill_model_id(char *str)
{
diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index 3e2e9f6..058c57f 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -1255,6 +1255,10 @@ void cpu_report_tpr_access(CPUX86State *env, TPRAccess
access);
void disable_kvm_pv_eoi(void);
+void x86_cpu_compat_set_features(const char *cpu_model, FeatureWord w,
+ uint32_t feat_add, uint32_t feat_remove);
+
+
/* Return name of 32-bit register, from a R_* constant */
const char *get_register_name_32(unsigned int reg);
--
1.8.1.4
- [Qemu-devel] [PULL for-1.5 00/11] QOM CPUState patch queue 2013-05-06, Andreas Färber, 2013/05/06
- [Qemu-devel] [PULL 01/11] target-i386: Add ECX information to FeatureWordInfo, Andreas Färber, 2013/05/06
- [Qemu-devel] [PULL 02/11] target-i386: Use FeatureWord loop on filter_features_for_kvm(), Andreas Färber, 2013/05/06
- [Qemu-devel] [PULL 04/11] target-i386: Introduce X86CPU::filtered_features field, Andreas Färber, 2013/05/06
- [Qemu-devel] [PULL 05/11] target-i386: Add "filtered-features" property to X86CPU, Andreas Färber, 2013/05/06
- [Qemu-devel] [PULL 08/11] target-i386: Emulate X86CPU subclasses for global properties, Andreas Färber, 2013/05/06
- [Qemu-devel] [PULL 03/11] target-i386: Add "feature-words" property to X86CPU, Andreas Färber, 2013/05/06
- [Qemu-devel] [PULL 06/11] qdev: Let qdev_prop_parse() pass through Error, Andreas Färber, 2013/05/06
- [Qemu-devel] [PULL 07/11] qdev: Introduce qdev_prop_set_globals_for_type(), Andreas Färber, 2013/05/06
- [Qemu-devel] [PULL 09/11] target-i386: Change CPUID model of 486 to 8, Andreas Färber, 2013/05/06
- [Qemu-devel] [PULL 10/11] target-i386: Introduce generic CPUID feature compat function,
Andreas Färber <=
- [Qemu-devel] [PULL 11/11] target-i386: n270 can MOVBE, Andreas Färber, 2013/05/06