Line data    Source code

       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             : 
      29             : static 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             : };
      49             : 
      50             : enum x86_hypervisor_type x86_hyper_type;
      51             : EXPORT_SYMBOL(x86_hyper_type);
      52             : 
      53             : bool __initdata nopv;
      54           0 : static __init int parse_nopv(char *arg)
      55             : {
      56           0 :         nopv = true;
      57           0 :         return 0;
      58             : }
      59             : early_param("nopv", parse_nopv);
      60             : 
      61             : static inline const struct hypervisor_x86 * __init
      62           1 : detect_hypervisor_vendor(void)
      63             : {
      64           1 :         const struct hypervisor_x86 *h = NULL, * const *p;
      65           1 :         uint32_t pri, max_pri = 0;
      66             : 
      67           4 :         for (p = hypervisors; p < hypervisors + ARRAY_SIZE(hypervisors); p++) {
      68           3 :                 if (unlikely(nopv) && !(*p)->ignore_nopv)
      69           0 :                         continue;
      70             : 
      71           3 :                 pri = (*p)->detect();
      72           3 :                 if (pri > max_pri) {
      73           1 :                         max_pri = pri;
      74           1 :                         h = *p;
      75             :                 }
      76             :         }
      77             : 
      78           1 :         if (h)
      79           1 :                 pr_info("Hypervisor detected: %s\n", h->name);
      80             : 
      81           1 :         return h;
      82             : }
      83             : 
      84           2 : static void __init copy_array(const void *src, void *target, unsigned int size)
      85             : {
      86           2 :         unsigned int i, n = size / sizeof(void *);
      87           2 :         const void * const *from = (const void * const *)src;
      88           2 :         const void **to = (const void **)target;
      89             : 
      90          11 :         for (i = 0; i < n; i++)
      91           9 :                 if (from[i])
      92           4 :                         to[i] = from[i];
      93           2 : }
      94             : 
      95           1 : void __init init_hypervisor_platform(void)
      96             : {
      97           1 :         const struct hypervisor_x86 *h;
      98             : 
      99           1 :         h = detect_hypervisor_vendor();
     100             : 
     101           1 :         if (!h)
     102             :                 return;
     103             : 
     104           1 :         copy_array(&h->init, &x86_init.hyper, sizeof(h->init));
     105           1 :         copy_array(&h->runtime, &x86_platform.hyper, sizeof(h->runtime));
     106             : 
     107           1 :         x86_hyper_type = h->type;
     108           1 :         x86_init.hyper.init_platform();
     109             : }