[Qemu-devel] [PATCH 2/3] target-i386/kvm: set Hyper-V features cpuid bit HV_X64_MSR_VP_INDEX_AVAILABLE

["Denis V. Lunev" <den@openvz.org>]

From: Andrey Smetanin <asmetanin@virtuozzo.com>

Hyper-V features bit HV_X64_MSR_VP_INDEX_AVAILABLE value is
based on cpu option "hv-vpindex" and kernel support of
HV_X64_MSR_VP_INDEX.

Signed-off-by: Andrey Smetanin <asmetanin@virtuozzo.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Paolo Bonzini <pbonzini@redhat.com>
CC: Richard Henderson <rth@twiddle.net>
CC: Eduardo Habkost <ehabkost@redhat.com>
CC: "Andreas Färber" <afaerber@suse.de>
CC: Marcelo Tosatti <mtosatti@redhat.com>
---
 target-i386/cpu-qom.h |  1 +
 target-i386/cpu.c     |  1 +
 target-i386/kvm.c     | 11 ++++++++++-
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/target-i386/cpu-qom.h b/target-i386/cpu-qom.h
index 3789a2f..85b9bd2 100644
--- a/target-i386/cpu-qom.h
+++ b/target-i386/cpu-qom.h
@@ -90,6 +90,7 @@ typedef struct X86CPU {
     int hyperv_spinlock_attempts;
     bool hyperv_time;
     bool hyperv_reset;
+    bool hyperv_vpindex;
     bool check_cpuid;
     bool enforce_cpuid;
     bool expose_kvm;
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 21828ad..86dc8fa 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -3122,6 +3122,7 @@ static Property x86_cpu_properties[] = {
     DEFINE_PROP_BOOL("hv-vapic", X86CPU, hyperv_vapic, false),
     DEFINE_PROP_BOOL("hv-time", X86CPU, hyperv_time, false),
     DEFINE_PROP_BOOL("hv-reset", X86CPU, hyperv_reset, false),
+    DEFINE_PROP_BOOL("hv-vpindex", X86CPU, hyperv_vpindex, false),
     DEFINE_PROP_BOOL("check", X86CPU, check_cpuid, false),
     DEFINE_PROP_BOOL("enforce", X86CPU, enforce_cpuid, false),
     DEFINE_PROP_BOOL("kvm", X86CPU, expose_kvm, true),
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 37e82fb..5bf2c51 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -81,6 +81,7 @@ static bool has_msr_hv_hypercall;
 static bool has_msr_hv_vapic;
 static bool has_msr_hv_tsc;
 static bool has_msr_hv_reset;
+static bool has_msr_hv_vpindex;
 static bool has_msr_mtrr;
 static bool has_msr_xss;
 
@@ -459,7 +460,8 @@ static bool hyperv_enabled(X86CPU *cpu)
            (hyperv_hypercall_available(cpu) ||
             cpu->hyperv_time  ||
             cpu->hyperv_relaxed_timing ||
-            cpu->hyperv_reset);
+            cpu->hyperv_reset ||
+            cpu->hyperv_vpindex);
 }
 
 static Error *invtsc_mig_blocker;
@@ -528,6 +530,9 @@ int kvm_arch_init_vcpu(CPUState *cs)
         if (cpu->hyperv_reset && has_msr_hv_reset) {
             c->eax |= HV_X64_MSR_RESET_AVAILABLE;
         }
+        if (cpu->hyperv_vpindex && has_msr_hv_vpindex) {
+            c->eax |= HV_X64_MSR_VP_INDEX_AVAILABLE;
+        }
         c = &cpuid_data.entries[cpuid_i++];
         c->function = HYPERV_CPUID_ENLIGHTMENT_INFO;
         if (cpu->hyperv_relaxed_timing) {
@@ -852,6 +857,10 @@ static int kvm_get_supported_msrs(KVMState *s)
                     has_msr_hv_reset = true;
                     continue;
                 }
+                if (kvm_msr_list->indices[i] == HV_X64_MSR_VP_INDEX) {
+                    has_msr_hv_vpindex = true;
+                    continue;
+                }
             }
         }
 
-- 
2.1.4