x86, amd: Check X86_FEATURE_OSVW bit before accessing OSVW MSRs

If host CPU is exposed to a guest the OSVW MSRs are not guaranteed
to be present and a GP fault occurs. Thus checking the feature flag is
essential.

Cc: <stable@kernel.org> # .32.x .33.x
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
LKML-Reference: <20100427101348.GC4489@alberich.amd.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

arch/x86/kernel/process.c

@@ -546,12 +546,14 @@ static int __cpuinit check_c1e_idle(const struct cpuinfo_x86 *c)
 		 * check OSVW bit for CPUs that are not affected
 		 * by erratum #400
 		 */
+		if (cpu_has(c, X86_FEATURE_OSVW)) {
 			rdmsrl(MSR_AMD64_OSVW_ID_LENGTH, val);
 			if (val >= 2) {
 				rdmsrl(MSR_AMD64_OSVW_STATUS, val);
 				if (!(val & BIT(1)))
 					goto no_c1e_idle;
 			}
+		}
 		return 1;
 	}