Revert "KVM: nested VMX: disable perf cpuid reporting"

commit 0b4c208d443ba2af82b4c70f99ca8df31e9a0020 upstream.

This reverts commit bc6134942dbbf31c25e9bd7c876be5da81c9e1ce.

A CPUID instruction executed in VMX non-root mode always causes a
VM-exit, regardless of the leaf being queried.

Fixes: bc6134942dbb ("KVM: nested VMX: disable perf cpuid reporting")
Signed-off-by: Jim Mattson <jmattson@google.com>
[The issue solved by bc6134942dbb has been resolved with ff651cb613b4
 ("KVM: nVMX: Add nested msr load/restore algorithm").]
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 2e1fd58..642e9c9 100644 (file)
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -818,12 +818,6 @@ void kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx, u32 *ecx, u32 *edx)
        if (!best)
                best = check_cpuid_limit(vcpu, function, index);
 
-       /*
-        * Perfmon not yet supported for L2 guest.
-        */
-       if (is_guest_mode(vcpu) && function == 0xa)
-               best = NULL;
-
        if (best) {
                *eax = best->eax;
                *ebx = best->ebx;

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 0a472e9..cc87b16 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -7754,8 +7754,6 @@ static bool nested_vmx_exit_handled(struct kvm_vcpu *vcpu)
        case EXIT_REASON_TASK_SWITCH:
                return true;
        case EXIT_REASON_CPUID:
-               if (kvm_register_read(vcpu, VCPU_REGS_RAX) == 0xa)
-                       return false;
                return true;
        case EXIT_REASON_HLT:
                return nested_cpu_has(vmcs12, CPU_BASED_HLT_EXITING);