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-rw-r--r--arch/x86/kvm/cpuid.c16
1 files changed, 10 insertions, 6 deletions
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 63316036f85a..6bf4a261b308 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -618,16 +618,20 @@ static inline int __do_cpuid_func(struct kvm_cpuid_entry2 *entry, u32 function,
*/
case 0x1f:
case 0xb: {
- int i, level_type;
+ int i;
- /* read more entries until level_type is zero */
- for (i = 1; ; ++i) {
+ /*
+ * We filled in entry[0] for CPUID(EAX=<function>,
+ * ECX=00H) above. If its level type (ECX[15:8]) is
+ * zero, then the leaf is unimplemented, and we're
+ * done. Otherwise, continue to populate entries
+ * until the level type (ECX[15:8]) of the previously
+ * added entry is zero.
+ */
+ for (i = 1; entry[i - 1].ecx & 0xff00; ++i) {
if (*nent >= maxnent)
goto out;
- level_type = entry[i - 1].ecx & 0xff00;
- if (!level_type)
- break;
do_host_cpuid(&entry[i], function, i);
++*nent;
}