@@ -3364,6 +3364,27 @@ void hvm_cpuid(unsigned int input, unsig
if ( cpuid_hypervisor_leaves(input, count, eax, ebx, ecx, edx) )
return;
+ if ( input & 0x7fffffff )
+ {
+ /*
+ * Requests outside the supported leaf ranges return zero on AMD
+ * and the highest basic leaf output on Intel. Uniformly follow
+ * the AMD model as the more sane one.
+ */
+ unsigned int limit;
+
+ domain_cpuid(d, (input >> 16) != 0x8000 ? 0 : 0x80000000, 0,
+ &limit, &dummy, &dummy, &dummy);
+ if ( input > limit )
+ {
+ *eax = 0;
+ *ebx = 0;
+ *ecx = 0;
+ *edx = 0;
+ return;
+ }
+ }
+
domain_cpuid(d, input, count, eax, ebx, ecx, edx);
switch ( input )
@@ -952,6 +952,29 @@ void pv_cpuid(struct cpu_user_regs *regs
if ( cpuid_hypervisor_leaves(leaf, subleaf, &a, &b, &c, &d) )
goto out;
+ if ( leaf & 0x7fffffff )
+ {
+ /*
+ * Requests outside the supported leaf ranges return zero on AMD
+ * and the highest basic leaf output on Intel. Uniformly follow
+ * the AMD model as the more sane one.
+ */
+ unsigned int limit = (leaf >> 16) != 0x8000 ? 0 : 0x80000000, dummy;
+
+ if ( !is_control_domain(currd) && !is_hardware_domain(currd) )
+ domain_cpuid(currd, limit, 0, &limit, &dummy, &dummy, &dummy);
+ else
+ limit = cpuid_eax(limit);
+ if ( leaf > limit )
+ {
+ regs->eax = 0;
+ regs->ebx = 0;
+ regs->ecx = 0;
+ regs->edx = 0;
+ return;
+ }
+ }
+
if ( !is_control_domain(currd) && !is_hardware_domain(currd) )
domain_cpuid(currd, leaf, subleaf, &a, &b, &c, &d);
else