Hide host CPUID 0x15 TSC/Crystal ratio/freq info from guest

In recent Linux (5.3+) and OpenBSD (6.6+) kernels, and with hosts that
support CPUID 0x15, the local APIC frequency is determined directly
from the reported crystal clock to avoid calibration against the 8254
timer.

However, the local APIC frequency implemented by bhyve is 128MHz, where
most h/w systems report frequencies around 25MHz. This shows up on
OpenBSD guests as repeated keystrokes on the emulated PS2 keyboard
when using VNC, since the kernel's timers are now much shorter.

Fix by reporting all-zeroes for CPUID 0x15. This allows guests to fall
back to using the 8254 to calibrate the local APIC frequency.

Future work could be to compute values returned for 0x15 that would
match the host TSC and bhyve local APIC frequency, though all dependencies
on this would need to be examined (for example, Linux will start using
0x16 for some hosts).

PR:	246321
Reported by:	Jason Tubnor (and tested)
Reviewed by:	jhb
Approved by:	jhb, bz (mentor)
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D24837

sys/amd64/vmm/x86.c

@@ -560,6 +560,18 @@ x86_emulate_cpuid(struct vm *vm, int vcpu_id,
 			}
 			break;
 
+		case CPUID_0000_0015:
+			/*
+			 * Don't report CPU TSC/Crystal ratio and clock
+			 * values since guests may use these to derive the
+			 * local APIC frequency..
+			 */
+			regs[0] = 0;
+			regs[1] = 0;
+			regs[2] = 0;
+			regs[3] = 0;
+			break;
+
 		case 0x40000000:
 			regs[0] = CPUID_VM_HIGH;
 			bcopy(bhyve_id, &regs[1], 4);

sys/amd64/vmm/x86.h

@@ -41,6 +41,7 @@
 #define	CPUID_0000_000A	(0xA)
 #define	CPUID_0000_000B	(0xB)
 #define	CPUID_0000_000D	(0xD)
+#define	CPUID_0000_0015	(0x15)
 #define CPUID_8000_0000	(0x80000000)
 #define CPUID_8000_0001	(0x80000001)
 #define CPUID_8000_0002	(0x80000002)