hypervisor.c

  1/*
  2 * Common hypervisor code
  3 *
  4 * Copyright (C) 2008, VMware, Inc.
  5 * Author : Alok N Kataria <akataria@vmware.com>
  6 *
  7 * This program is free software; you can redistribute it and/or modify
  8 * it under the terms of the GNU General Public License as published by
  9 * the Free Software Foundation; either version 2 of the License, or
 10 * (at your option) any later version.
 11 *
 12 * This program is distributed in the hope that it will be useful, but
 13 * WITHOUT ANY WARRANTY; without even the implied warranty of
 14 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 15 * NON INFRINGEMENT.  See the GNU General Public License for more
 16 * details.
 17 *
 18 * You should have received a copy of the GNU General Public License
 19 * along with this program; if not, write to the Free Software
 20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 21 *
 22 */
 23
 24#include <linux/init.h>
 25#include <linux/export.h>
 26#include <asm/processor.h>
 27#include <asm/hypervisor.h>
 28
 29static const __initconst struct hypervisor_x86 * const hypervisors[] =
 30{
 31#ifdef CONFIG_XEN_PV
 32	&x86_hyper_xen_pv,
 33#endif
 34#ifdef CONFIG_XEN_PVHVM
 35	&x86_hyper_xen_hvm,
 36#endif
 37	&x86_hyper_vmware,
 38	&x86_hyper_ms_hyperv,
 39#ifdef CONFIG_KVM_GUEST
 40	&x86_hyper_kvm,
 41#endif
 42#ifdef CONFIG_JAILHOUSE_GUEST
 43	&x86_hyper_jailhouse,
 44#endif
 45#ifdef CONFIG_ACRN_GUEST
 46	&x86_hyper_acrn,
 47#endif
 48#ifdef CONFIG_BHYVE_GUEST
 49	&x86_hyper_bhyve,
 50#endif
 51};
 52
 53enum x86_hypervisor_type x86_hyper_type;
 54EXPORT_SYMBOL(x86_hyper_type);
 55
 56bool __initdata nopv;
 57static __init int parse_nopv(char *arg)
 58{
 59	nopv = true;
 60	return 0;
 61}
 62early_param("nopv", parse_nopv);
 63
 64static inline const struct hypervisor_x86 * __init
 65detect_hypervisor_vendor(void)
 66{
 67	const struct hypervisor_x86 *h = NULL, * const *p;
 68	uint32_t pri, max_pri = 0;
 69
 70	for (p = hypervisors; p < hypervisors + ARRAY_SIZE(hypervisors); p++) {
 71		if (unlikely(nopv) && !(*p)->ignore_nopv)
 72			continue;
 73
 74		pri = (*p)->detect();
 75		if (pri > max_pri) {
 76			max_pri = pri;
 77			h = *p;
 78		}
 79	}
 80
 81	if (h)
 82		pr_info("Hypervisor detected: %s\n", h->name);
 83
 84	return h;
 85}
 86
 87static void __init copy_array(const void *src, void *target, unsigned int size)
 88{
 89	unsigned int i, n = size / sizeof(void *);
 90	const void * const *from = (const void * const *)src;
 91	const void **to = (const void **)target;
 92
 93	for (i = 0; i < n; i++)
 94		if (from[i])
 95			to[i] = from[i];
 96}
 97
 98void __init init_hypervisor_platform(void)
 99{
100	const struct hypervisor_x86 *h;
101
102	h = detect_hypervisor_vendor();
103
104	if (!h)
105		return;
106
107	copy_array(&h->init, &x86_init.hyper, sizeof(h->init));
108	copy_array(&h->runtime, &x86_platform.hyper, sizeof(h->runtime));
109
110	x86_hyper_type = h->type;
111	x86_init.hyper.init_platform();
112}