arch/powerpc/include/asm/kvm_para.h

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License, version 2, as
   4  * published by the Free Software Foundation.
   5  *
   6  * This program is distributed in the hope that it will be useful,
   7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9  * GNU General Public License for more details.
  10  *
  11  * You should have received a copy of the GNU General Public License
  12  * along with this program; if not, write to the Free Software
  13  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  14  *
  15  * Copyright IBM Corp. 2008
  16  *
  17  * Authors: Hollis Blanchard <hollisb@us.ibm.com>
  18  */
  19 #ifndef __POWERPC_KVM_PARA_H__
  20 #define __POWERPC_KVM_PARA_H__
  21
  22 #include <uapi/asm/kvm_para.h>
  23
  24 #ifdef CONFIG_KVM_GUEST
  25
  26 #include <linux/of.h>
  27
  28 static inline int kvm_para_available(void)
  29 {
  30         struct device_node *hyper_node;
  31
  32         hyper_node = of_find_node_by_path("/hypervisor");
  33         if (!hyper_node)
  34                 return 0;
  35
  36         if (!of_device_is_compatible(hyper_node, "linux,kvm"))
  37                 return 0;
  38
  39         return 1;
  40 }
  41
  42 #else
  43
  44 static inline int kvm_para_available(void)
  45 {
  46         return 0;
  47 }
  48
  49 #endif
  50
  51 static inline unsigned int kvm_arch_para_features(void)
  52 {
  53         unsigned long r;
  54
  55         if (!kvm_para_available())
  56                 return 0;
  57
  58         if(epapr_hypercall0_1(KVM_HCALL_TOKEN(KVM_HC_FEATURES), &r))
  59                 return 0;
  60
  61         return r;
  62 }
  63
  64 static inline bool kvm_check_and_clear_guest_paused(void)
  65 {
  66         return false;
  67 }
  68
  69 #endif /* __POWERPC_KVM_PARA_H__ */