[Qemu-devel] [PATCH] target-i386: adds PV_DEDICATED hint CPUID feature bit

[Wanpeng Li <kernellwp@gmail.com>]

From: Wanpeng Li <wanpengli@tencent.com>

Add PV_DEDICATED hint cpuid feature bit.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
---
 target/i386/cpu.c | 4 ++++
 target/i386/cpu.h | 3 +++
 2 files changed, 7 insertions(+)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index d70954b..cf48931 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -4076,6 +4076,9 @@ static int x86_cpu_filter_features(X86CPU *cpu)
             x86_cpu_get_supported_feature_word(w, false);
         uint32_t requested_features = env->features[w];
         env->features[w] &= host_feat;
+        if (cpu->pv_dedicated && (w == FEAT_KVM)) {
+            env->features[w] |= CPUID_PV_DEDICATED;
+        }
         cpu->filtered_features[w] = requested_features & ~env->features[w];
         if (cpu->filtered_features[w]) {
             rv = 1;
@@ -4682,6 +4685,7 @@ static Property x86_cpu_properties[] = {
                      false),
     DEFINE_PROP_BOOL("vmware-cpuid-freq", X86CPU, vmware_cpuid_freq, true),
     DEFINE_PROP_BOOL("tcg-cpuid", X86CPU, expose_tcg, true),
+    DEFINE_PROP_BOOL("pv-dedicated", X86CPU, pv_dedicated, false),
 
     /*
      * From "Requirements for Implementing the Microsoft
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index f91e37d..8000da5 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -672,6 +672,8 @@ typedef uint32_t FeatureWordArray[FEATURE_WORDS];
 
 #define CPUID_8000_0008_EBX_IBPB    (1U << 12) /* Indirect Branch Prediction Barrier */
 
+#define CPUID_PV_DEDICATED     (1U << 8)
+
 #define CPUID_XSAVE_XSAVEOPT   (1U << 0)
 #define CPUID_XSAVE_XSAVEC     (1U << 1)
 #define CPUID_XSAVE_XGETBV1    (1U << 2)
@@ -1276,6 +1278,7 @@ struct X86CPU {
     bool expose_kvm;
     bool expose_tcg;
     bool migratable;
+    bool pv_dedicated;
     bool max_features; /* Enable all supported features automatically */
     uint32_t apic_id;
 
-- 
2.7.4