KVM: Add cpuid_update() callback to kvm_x86_ops

Sometime, we need to adjust some state in order to reflect guest CPUID
setting, e.g. if we don't expose rdtscp to guest, we won't want to enable
it on hardware. cpuid_update() is introduced for this purpose.

Also export kvm_find_cpuid_entry() for later use.

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index f8f2fdc26894..75e8931e96c7 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3988,6 +3988,10 @@ static bool vmx_gb_page_enable(void)
         return false;
 }
 
+static void vmx_cpuid_update(struct kvm_vcpu *vcpu)
+{
+}
+
 static struct kvm_x86_ops vmx_x86_ops = {
         .cpu_has_kvm_support = cpu_has_kvm_support,
         .disabled_by_bios = vmx_disabled_by_bios,
@@ -4052,6 +4056,8 @@ static struct kvm_x86_ops vmx_x86_ops = {
 
         .exit_reasons_str = vmx_exit_reasons_str,
         .gb_page_enable = vmx_gb_page_enable,
+
+        .cpuid_update = vmx_cpuid_update,
 };
 
 static int __init vmx_init(void)