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[Qemu-devel] [RFC 1/7] target-i386: Introduce generic CPUID feature comp
From: |
Eduardo Habkost |
Subject: |
[Qemu-devel] [RFC 1/7] target-i386: Introduce generic CPUID feature compat function |
Date: |
Thu, 25 Apr 2013 15:43:00 -0300 |
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>
---
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 5bcb79c..a207474 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -970,6 +970,32 @@ 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 aca78fc..60581e1 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -1254,6 +1254,10 @@ 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] [RFC 0/7] CPUID fixes for 1.5, Eduardo Habkost, 2013/04/25
- [Qemu-devel] [RFC 1/7] target-i386: Introduce generic CPUID feature compat function,
Eduardo Habkost <=
- [Qemu-devel] [RFC 2/7] target-i386: Introduce compat function to set CPUID 'level', Eduardo Habkost, 2013/04/25
- [Qemu-devel] [RFC 3/7] target-i386: Introduce compat function to set CPUID 'model', Eduardo Habkost, 2013/04/25
- [Qemu-devel] [RFC 4/7] pc: Use separate init functions for pc-*-1.4, Eduardo Habkost, 2013/04/25
- [Qemu-devel] [RFC 5/7] target-i386: n270 can MOVBE, Eduardo Habkost, 2013/04/25
- [Qemu-devel] [RFC 6/7] target-i386: change CPUID model of 486 to 8, Eduardo Habkost, 2013/04/25
- [Qemu-devel] [RFC 7/7] target-i386: Disable direct passthrough of PMU CPUID leaf by default, Eduardo Habkost, 2013/04/25