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i386: Add support for SPEC_CTRL MSR

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Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20180109154519.25634-3-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Paolo Bonzini 2018-01-09 13:45:14 -02:00 • committed by Eduardo Habkost
parent 807e9869b8
commit a33a2cfe2f
3 changed files with 37 additions and 0 deletions
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14
target/i386/kvm.c
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@ -91,6 +91,7 @@ static bool has_msr_hv_synic;
static bool has_msr_hv_stimer;
static bool has_msr_hv_frequencies;
static bool has_msr_xss;
static bool has_msr_spec_ctrl;
static uint32_t has_architectural_pmu_version;
static uint32_t num_architectural_pmu_gp_counters;
@ -1153,6 +1154,9 @@ static int kvm_get_supported_msrs(KVMState *s)
case HV_X64_MSR_TSC_FREQUENCY:
has_msr_hv_frequencies = true;
break;
case MSR_IA32_SPEC_CTRL:
has_msr_spec_ctrl = true;
break;
}
}
}
@ -1635,6 +1639,9 @@ static int kvm_put_msrs(X86CPU *cpu, int level)
if (has_msr_xss) {
kvm_msr_entry_add(cpu, MSR_IA32_XSS, env->xss);
}
if (has_msr_spec_ctrl) {
kvm_msr_entry_add(cpu, MSR_IA32_SPEC_CTRL, env->spec_ctrl);
}
#ifdef TARGET_X86_64
if (lm_capable_kernel) {
kvm_msr_entry_add(cpu, MSR_CSTAR, env->cstar);
@ -1643,6 +1650,7 @@ static int kvm_put_msrs(X86CPU *cpu, int level)
kvm_msr_entry_add(cpu, MSR_LSTAR, env->lstar);
}
#endif
/*
* The following MSRs have side effects on the guest or are too heavy
* for normal writeback. Limit them to reset or full state updates.
@ -1980,6 +1988,9 @@ static int kvm_get_msrs(X86CPU *cpu)
if (has_msr_xss) {
kvm_msr_entry_add(cpu, MSR_IA32_XSS, 0);
}
if (has_msr_spec_ctrl) {
kvm_msr_entry_add(cpu, MSR_IA32_SPEC_CTRL, 0);
}
if (!env->tsc_valid) {
@ -2327,6 +2338,9 @@ static int kvm_get_msrs(X86CPU *cpu)
env->mtrr_var[MSR_MTRRphysIndex(index)].base = msrs[i].data;
}
break;
case MSR_IA32_SPEC_CTRL:
env->spec_ctrl = msrs[i].data;
break;
}
}