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target-i386: Publish advised value of MSR_IA32_FEATURE_CONTROL via fw_cfg 

It's a prerequisite that certain bits of MSR_IA32_FEATURE_CONTROL should
be set before some features (e.g. VMX and LMCE) can be used, which is
usually done by the firmware. This patch adds a fw_cfg file
"etc/msr_feature_control" which contains the advised value of
MSR_IA32_FEATURE_CONTROL and can be used by guest firmware (e.g. SeaBIOS).

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Haozhong Zhang 2016-06-23 14:15:43 +08:00 committed by Eduardo Habkost
parent 87f8b62604
commit 217f1b4a72
2 changed files with 33 additions and 0 deletions
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29
hw/i386/pc.c
View File

@ -1166,6 +1166,34 @@ void pc_cpus_init(PCMachineState *pcms)
smbios_set_cpuid(cpu->env.cpuid_version, cpu->env.features[FEAT_1_EDX]);
}
static void pc_build_feature_control_file(PCMachineState *pcms)
{
X86CPU *cpu = X86_CPU(pcms->possible_cpus->cpus[0].cpu);
CPUX86State *env = &cpu->env;
uint32_t unused, ecx, edx;
uint64_t feature_control_bits = 0;
uint64_t *val;
cpu_x86_cpuid(env, 1, 0, &unused, &unused, &ecx, &edx);
if (ecx & CPUID_EXT_VMX) {
feature_control_bits |= FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX;
}
if ((edx & (CPUID_EXT2_MCE | CPUID_EXT2_MCA)) ==
(CPUID_EXT2_MCE | CPUID_EXT2_MCA) &&
(env->mcg_cap & MCG_LMCE_P)) {
feature_control_bits |= FEATURE_CONTROL_LMCE;
}
if (!feature_control_bits) {
return;
}
val = g_malloc(sizeof(*val));
*val = cpu_to_le64(feature_control_bits | FEATURE_CONTROL_LOCKED);
fw_cfg_add_file(pcms->fw_cfg, "etc/msr_feature_control", val, sizeof(*val));
}
static
void pc_machine_done(Notifier *notifier, void *data)
{
@ -1193,6 +1221,7 @@ void pc_machine_done(Notifier *notifier, void *data)
acpi_setup();
if (pcms->fw_cfg) {
pc_build_smbios(pcms->fw_cfg);
pc_build_feature_control_file(pcms);
}
}

4
target-i386/cpu.h
View File

@ -332,6 +332,10 @@
#define MSR_TSC_ADJUST 0x0000003b
#define MSR_IA32_TSCDEADLINE 0x6e0
#define FEATURE_CONTROL_LOCKED (1<<0)
#define FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX (1<<2)
#define FEATURE_CONTROL_LMCE (1<<20)
#define MSR_P6_PERFCTR0 0xc1
#define MSR_IA32_SMBASE 0x9e