i386/kvm: support guest access CORE cstate

Allow guest reads CORE cstate when exposing host CPU power management capabilities
to the guest. PKG cstate is restricted to avoid a guest to get the whole package
information in multi-tenant scenario.

Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Message-Id: <1563154124-18579-1-git-send-email-wanpengli@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/linux-headers/linux/kvm.h b/linux-headers/linux/kvm.h
index c8423e760c4c06cfca2d766d3472e50bd32eb875..18892d65414ab16a9cb63f8a4037f3c3a291b02d 100644 (file)
--- a/linux-headers/linux/kvm.h
+++ b/linux-headers/linux/kvm.h
@@ -696,9 +696,11 @@ struct kvm_ioeventfd {
 #define KVM_X86_DISABLE_EXITS_MWAIT          (1 << 0)
 #define KVM_X86_DISABLE_EXITS_HLT            (1 << 1)
 #define KVM_X86_DISABLE_EXITS_PAUSE          (1 << 2)
+#define KVM_X86_DISABLE_EXITS_CSTATE         (1 << 3)
 #define KVM_X86_DISABLE_VALID_EXITS          (KVM_X86_DISABLE_EXITS_MWAIT | \
                                               KVM_X86_DISABLE_EXITS_HLT | \
-                                              KVM_X86_DISABLE_EXITS_PAUSE)
+                                              KVM_X86_DISABLE_EXITS_PAUSE | \
+                                              KVM_X86_DISABLE_EXITS_CSTATE)
 
 /* for KVM_ENABLE_CAP */
 struct kvm_enable_cap {

diff --git a/target/i386/kvm.c b/target/i386/kvm.c
index 8023c679ea894882034a874928c77056d0b483ad..3435fc4345270ebff36292dc6528ca6e6ee66469 100644 (file)
--- a/target/i386/kvm.c
+++ b/target/i386/kvm.c
@@ -2076,7 +2076,8 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
         if (disable_exits) {
             disable_exits &= (KVM_X86_DISABLE_EXITS_MWAIT |
                               KVM_X86_DISABLE_EXITS_HLT |
-                              KVM_X86_DISABLE_EXITS_PAUSE);
+                              KVM_X86_DISABLE_EXITS_PAUSE |
+                              KVM_X86_DISABLE_EXITS_CSTATE);
         }
 
         ret = kvm_vm_enable_cap(s, KVM_CAP_X86_DISABLE_EXITS, 0,