xmsr.c

/*-
 * Copyright (c) 2011 NetApp, Inc.
 * Copyright (c) 2015 xhyve developers
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD$
 */

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <xhyve/support/misc.h>
#include <xhyve/support/specialreg.h>
#include <xhyve/vmm/vmm_api.h>
#include <xhyve/xhyve.h>
#include <xhyve/xmsr.h>

int
emulate_wrmsr(UNUSED int vcpu, uint32_t num, UNUSED uint64_t val)
{
	switch (num) {
	case 0xd04: /* Sandy Bridge uncore PMCs */
	case 0xc24:
		return (0);
	case MSR_BIOS_UPDT_TRIG:
		return (0);
	case MSR_BIOS_SIGN:
		return (0);
	default:
		break;
	}

	return (-1);
}

int
emulate_rdmsr(UNUSED int vcpu, uint32_t num, uint64_t *val)
{
	int error = 0;

	switch (num) {
	case MSR_BIOS_SIGN:
	case MSR_IA32_PLATFORM_ID:
	case MSR_PKG_ENERGY_STATUS:
	case MSR_PP0_ENERGY_STATUS:
	case MSR_PP1_ENERGY_STATUS:
	case MSR_DRAM_ENERGY_STATUS:
		*val = 0;
		break;
	case MSR_RAPL_POWER_UNIT:
		/*
		 * Use the default value documented in section
		 * "RAPL Interfaces" in Intel SDM vol3.
		 */
		*val = 0x000a1003;
		break;
	default:
		error = -1;
		break;
	}

	return (error);
}

int
init_msr(void)
{
	u_int regs[4];
	u_int cpu_vendor[4];

	do_cpuid(0, regs);
	cpu_vendor[0] = regs[1];
	cpu_vendor[1] = regs[3];
	cpu_vendor[2] = regs[2];
	cpu_vendor[3] = 0;

	if (strcmp(((char *) cpu_vendor), "GenuineIntel") == 0) {
		return 0;
	} else {
		fprintf(stderr, "Unknown cpu vendor \"%s\"\n", ((char *) cpu_vendor));
		return (-1);
	}
}