KVM: x86: Turbo bits in MSR_PLATFORM_INFO

Allow userspace to set turbo bits in MSR_PLATFORM_INFO. Previously, only
the CPUID faulting bit was settable. But now any bit in
MSR_PLATFORM_INFO would be settable. This can be used, for example, to
convey frequency information about the platform on which the guest is
running.

Signed-off-by: Drew Schmitt <dasch@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 5fea53cdc5831f36645f69380273118876e507bd..e127703e277e6b23f524c402daca9c10840bdeb9 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2537,7 +2537,6 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
                break;
        case MSR_PLATFORM_INFO:
                if (!msr_info->host_initiated ||
-                   data & ~MSR_PLATFORM_INFO_CPUID_FAULT ||
                    (!(data & MSR_PLATFORM_INFO_CPUID_FAULT) &&
                     cpuid_fault_enabled(vcpu)))
                        return 1;