Add CPU table override config variable

src/config.c

@@ -625,6 +625,7 @@ load_machine(void)
 	}
     }
     cpu_s = (CPU *) &cpu_f->cpus[cpu];
+    cpu_override = config_get_int(cat, "cpu_override", 0);
 
     cpu_waitstates = config_get_int(cat, "cpu_waitstates", 0);
 
@@ -1787,6 +1788,10 @@ save_machine(void)
     config_set_string(cat, "cpu_family", (char *) cpu_f->internal_name);
     config_set_int(cat, "cpu_speed", cpu_f->cpus[cpu].rspeed);
     config_set_double(cat, "cpu_multi", cpu_f->cpus[cpu].multi);
+    if (cpu_override)
+	config_set_int(cat, "cpu_override", cpu_override);
+    else
+	config_delete_var(cat, "cpu_override");
 
     /* Forwards compatibility with the previous CPU model system. */
     config_delete_var(cat, "cpu_manufacturer");

src/cpu/cpu.c

@@ -152,6 +152,7 @@ uint32_t smbase = 0x30000;
 
 cpu_family_t	*cpu_f;
 CPU		*cpu_s;
+int		cpu_override;
 int		cpu_effective;
 int		cpu_multi;
 double		cpu_dmulti;
@@ -331,6 +332,9 @@ cpu_get_family(const char *internal_name)
 uint8_t
 cpu_is_eligible(const cpu_family_t *cpu_family, int cpu, int machine)
 {
+	if (cpu_override > 1) /* full override */
+		return 1;
+
 	/* Get machine. */
 	const machine_t *machine_s = &machines[machine];
 
@@ -344,6 +348,9 @@ cpu_is_eligible(const cpu_family_t *cpu_family, int cpu, int machine)
 	if (!(cpu_family->package & packages)) /* package type */
 		return 0;
 
+	if (cpu_override) /* partial override */
+		return 1;
+
 	const CPU *cpu_s = &cpu_family->cpus[cpu];
 
 	if (machine_s->cpu_block & cpu_s->cpu_type) /* CPU type blocklist */

src/cpu/cpu.h

@@ -375,6 +375,7 @@ extern const cpu_family_t cpu_families[];
 extern const cpu_legacy_machine_t cpu_legacy_table[];
 extern cpu_family_t *cpu_f;
 extern CPU	*cpu_s;
+extern int	cpu_override;
 
 extern int	cpu_isintel;
 extern int	cpu_iscyrix;