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