D14810.diff
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	Index: head/sys/x86/x86/identcpu.c
	===================================================================
	--- head/sys/x86/x86/identcpu.c
	+++ head/sys/x86/x86/identcpu.c
	@@ -1304,6 +1304,18 @@
	if (cpu_feature2 & CPUID2_HV) {
	vm_guest = VM_GUEST_VM;
	do_cpuid(0x40000000, regs);
	+
	+ /*
	+ * KVM from Linux kernels prior to commit
	+ * 57c22e5f35aa4b9b2fe11f73f3e62bbf9ef36190 set %eax
	+ * to 0 rather than a valid hv_high value. Check for
	+ * the KVM signature bytes and fixup %eax to the
	+ * highest supported leaf in that case.
	+ */
	+ if (regs[0] == 0 && regs[1] == 0x4b4d564b &&
	+ regs[2] == 0x564b4d56 && regs[3] == 0x0000004d)
	+ regs[0] = 0x40000001;
	+
	if (regs[0] >= 0x40000000) {
	hv_high = regs[0];
	((u_int *)&hv_vendor)[0] = regs[1];