[Qemu-devel] [PATCH v2 05/23] hyperv: make SynIC version msr constant

[Roman Kagan <rkagan@virtuozzo.com>]

The value of HV_X64_MSR_SVERSION is initialized once at vcpu init, and
is reset to zero on vcpu reset, which is wrong.

It is supposed to be a constant, so drop the field from X86CPU, set the
msr with the constant value, and don't bother getting it.

Signed-off-by: Roman Kagan <rkagan@virtuozzo.com>
---
v1 -> v2:
 - split out of v1 patch 4
 - make the value constant instead of keeping it on X86CPU

 target/i386/cpu.h | 1 -
 target/i386/kvm.c | 9 ++-------
 2 files changed, 2 insertions(+), 8 deletions(-)

diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index ad8600d..917e3c4 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -1099,7 +1099,6 @@ typedef struct CPUX86State {
     uint64_t msr_hv_crash_params[HV_CRASH_PARAMS];
     uint64_t msr_hv_runtime;
     uint64_t msr_hv_synic_control;
-    uint64_t msr_hv_synic_version;
     uint64_t msr_hv_synic_evt_page;
     uint64_t msr_hv_synic_msg_page;
     uint64_t msr_hv_synic_sint[HV_SINT_COUNT];
diff --git a/target/i386/kvm.c b/target/i386/kvm.c
index 27404dd..2795b63 100644
--- a/target/i386/kvm.c
+++ b/target/i386/kvm.c
@@ -654,7 +654,6 @@ static int hyperv_handle_properties(CPUState *cs)
         }
 
         env->features[FEAT_HYPERV_EAX] |= HV_SYNIC_AVAILABLE;
-        env->msr_hv_synic_version = HV_SYNIC_VERSION;
     }
     if (cpu->hyperv_stimer) {
         if (!has_msr_hv_stimer) {
@@ -1752,10 +1751,10 @@ static int kvm_put_msrs(X86CPU *cpu, int level)
         if (cpu->hyperv_synic) {
             int j;
 
+            kvm_msr_entry_add(cpu, HV_X64_MSR_SVERSION, HV_SYNIC_VERSION);
+
             kvm_msr_entry_add(cpu, HV_X64_MSR_SCONTROL,
                               env->msr_hv_synic_control);
-            kvm_msr_entry_add(cpu, HV_X64_MSR_SVERSION,
-                              env->msr_hv_synic_version);
             kvm_msr_entry_add(cpu, HV_X64_MSR_SIEFP,
                               env->msr_hv_synic_evt_page);
             kvm_msr_entry_add(cpu, HV_X64_MSR_SIMP,
@@ -2160,7 +2159,6 @@ static int kvm_get_msrs(X86CPU *cpu)
         uint32_t msr;
 
         kvm_msr_entry_add(cpu, HV_X64_MSR_SCONTROL, 0);
-        kvm_msr_entry_add(cpu, HV_X64_MSR_SVERSION, 0);
         kvm_msr_entry_add(cpu, HV_X64_MSR_SIEFP, 0);
         kvm_msr_entry_add(cpu, HV_X64_MSR_SIMP, 0);
         for (msr = HV_X64_MSR_SINT0; msr <= HV_X64_MSR_SINT15; msr++) {
@@ -2364,9 +2362,6 @@ static int kvm_get_msrs(X86CPU *cpu)
         case HV_X64_MSR_SCONTROL:
             env->msr_hv_synic_control = msrs[i].data;
             break;
-        case HV_X64_MSR_SVERSION:
-            env->msr_hv_synic_version = msrs[i].data;
-            break;
         case HV_X64_MSR_SIEFP:
             env->msr_hv_synic_evt_page = msrs[i].data;
             break;
-- 
2.9.4