x86/spectre_v2: Don't check microcode versions when running under hypervisors

As:

 1) It's known that hypervisors lie about the environment anyhow (host
    mismatch)
 
 2) Even if the hypervisor (Xen, KVM, VMWare, etc) provided a valid
    "correct" value, it all gets to be very murky when migration happens
    (do you provide the "new" microcode of the machine?).

And in reality the cloud vendors are the ones that should make sure that
the microcode that is running is correct and we should just sing lalalala
and trust them.

Signed-off-by: Konrad Rzeszutek Wilk <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Paolo Bonzini <[email protected]>
Cc: Wanpeng Li <[email protected]>
Cc: kvm <[email protected]>
Cc: Krčmář <[email protected]>
Cc: Borislav Petkov <[email protected]>
CC: "H. Peter Anvin" <[email protected]>
CC: [email protected]
Link: https://lkml.kernel.org/r/[email protected]

Author: konradwilk

arch/x86/kernel/cpu/intel.c

@@ -144,6 +144,13 @@ static bool bad_spectre_microcode(struct cpuinfo_x86 *c)
 {
 	int i;
 
+	/*
+	 * We know that the hypervisor lie to us on the microcode version so
+	 * we may as well hope that it is running the correct version.
+	 */
+	if (cpu_has(c, X86_FEATURE_HYPERVISOR))
+		return false;
+
 	for (i = 0; i < ARRAY_SIZE(spectre_bad_microcodes); i++) {
 		if (c->x86_model == spectre_bad_microcodes[i].model &&
 		    c->x86_stepping == spectre_bad_microcodes[i].stepping)