kvm: support TSC deadline MSR with subsection

KVM add emulation of lapic tsc deadline timer for guest.
This patch is co-operation work at qemu side.

Use subsections to save/restore the field (mtosatti).

Signed-off-by: Liu, Jinsong <jinsong.liu@intel.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index b6eef047bf..90a6ffba02 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -59,6 +59,7 @@ const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
 
 static bool has_msr_star;
 static bool has_msr_hsave_pa;
+static bool has_msr_tsc_deadline;
 static bool has_msr_async_pf_en;
 static int lm_capable_kernel;
 
@@ -568,6 +569,10 @@ static int kvm_get_supported_msrs(KVMState *s)
                     has_msr_hsave_pa = true;
                     continue;
                 }
+                if (kvm_msr_list->indices[i] == MSR_IA32_TSCDEADLINE) {
+                    has_msr_tsc_deadline = true;
+                    continue;
+                }
             }
         }
 
@@ -881,6 +886,9 @@ static int kvm_put_msrs(CPUState *env, int level)
     if (has_msr_hsave_pa) {
         kvm_msr_entry_set(&msrs[n++], MSR_VM_HSAVE_PA, env->vm_hsave);
     }
+    if (has_msr_tsc_deadline) {
+        kvm_msr_entry_set(&msrs[n++], MSR_IA32_TSCDEADLINE, env->tsc_deadline);
+    }
 #ifdef TARGET_X86_64
     if (lm_capable_kernel) {
         kvm_msr_entry_set(&msrs[n++], MSR_CSTAR, env->cstar);
@@ -1127,6 +1135,9 @@ static int kvm_get_msrs(CPUState *env)
     if (has_msr_hsave_pa) {
         msrs[n++].index = MSR_VM_HSAVE_PA;
     }
+    if (has_msr_tsc_deadline) {
+        msrs[n++].index = MSR_IA32_TSCDEADLINE;
+    }
 
     if (!env->tsc_valid) {
         msrs[n++].index = MSR_IA32_TSC;
@@ -1195,6 +1206,9 @@ static int kvm_get_msrs(CPUState *env)
         case MSR_IA32_TSC:
             env->tsc = msrs[i].data;
             break;
+        case MSR_IA32_TSCDEADLINE:
+            env->tsc_deadline = msrs[i].data;
+            break;
         case MSR_VM_HSAVE_PA:
             env->vm_hsave = msrs[i].data;
             break;