arch/powerpc/include/asm/kvm_para.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  *
   4  * Copyright IBM Corp. 2008
   5  *
   6  * Authors: Hollis Blanchard <hollisb@us.ibm.com>
   7  */
   8 #ifndef __POWERPC_KVM_PARA_H__
   9 #define __POWERPC_KVM_PARA_H__
  10
  11 #include <uapi/asm/kvm_para.h>
  12
  13 #ifdef CONFIG_KVM_GUEST
  14
  15 #include <linux/of.h>
  16
  17 static inline int kvm_para_available(void)
  18 {
  19         struct device_node *hyper_node;
  20
  21         hyper_node = of_find_node_by_path("/hypervisor");
  22         if (!hyper_node)
  23                 return 0;
  24
  25         if (!of_device_is_compatible(hyper_node, "linux,kvm"))
  26                 return 0;
  27
  28         return 1;
  29 }
  30
  31 #else
  32
  33 static inline int kvm_para_available(void)
  34 {
  35         return 0;
  36 }
  37
  38 #endif
  39
  40 static inline unsigned int kvm_arch_para_features(void)
  41 {
  42         unsigned long r;
  43
  44         if (!kvm_para_available())
  45                 return 0;
  46
  47         if(epapr_hypercall0_1(KVM_HCALL_TOKEN(KVM_HC_FEATURES), &r))
  48                 return 0;
  49
  50         return r;
  51 }
  52
  53 static inline unsigned int kvm_arch_para_hints(void)
  54 {
  55         return 0;
  56 }
  57
  58 static inline bool kvm_check_and_clear_guest_paused(void)
  59 {
  60         return false;
  61 }
  62
  63 #endif /* __POWERPC_KVM_PARA_H__ */