KVM: x86: Add callback to let modules decide over some supported cpuid bits

This patch adds the get_supported_cpuid callback to
kvm_x86_ops. It will be used in do_cpuid_ent to delegate the
decission about some supported cpuid bits to the
architecture modules.

Cc: stable@kernel.org
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index b10d1630c203..0fa2035bd8e7 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -3152,6 +3152,10 @@ static void svm_cpuid_update(struct kvm_vcpu *vcpu)
 {
 }
 
+static void svm_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
+{
+}
+
 static const struct trace_print_flags svm_exit_reasons_str[] = {
         { SVM_EXIT_READ_CR0,                    "read_cr0" },
         { SVM_EXIT_READ_CR3,                    "read_cr3" },
@@ -3297,6 +3301,8 @@ static struct kvm_x86_ops svm_x86_ops = {
         .cpuid_update = svm_cpuid_update,
 
         .rdtscp_supported = svm_rdtscp_supported,
+
+        .set_supported_cpuid = svm_set_supported_cpuid,
 };
 
 static int __init svm_init(void)