4 * Copyright IBM Corp. 2008, 2009
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License (version 2 only)
8 * as published by the Free Software Foundation.
10 * Author(s): Carsten Otte <cotte@de.ibm.com>
13 #ifndef __KVM_S390_GACCESS_H
14 #define __KVM_S390_GACCESS_H
16 #include <linux/compiler.h>
17 #include <linux/kvm_host.h>
18 #include <asm/uaccess.h>
21 static inline void __user *__gptr_to_uptr(struct kvm_vcpu *vcpu,
25 unsigned long prefix = vcpu->arch.sie_block->prefix;
26 unsigned long gaddr = (unsigned long) gptr;
30 if (gaddr < 2 * PAGE_SIZE)
32 else if ((gaddr >= prefix) && (gaddr < prefix + 2 * PAGE_SIZE))
35 uaddr = gmap_fault(gaddr, vcpu->arch.gmap);
36 if (IS_ERR_VALUE(uaddr))
38 return (void __user *)uaddr;
41 #define get_guest(vcpu, x, gptr) \
43 __typeof__(gptr) __uptr = __gptr_to_uptr(vcpu, gptr, 1);\
44 int __mask = sizeof(__typeof__(*(gptr))) - 1; \
47 if (IS_ERR((void __force *)__uptr)) { \
48 __ret = PTR_ERR((void __force *)__uptr); \
50 BUG_ON((unsigned long)__uptr & __mask); \
51 __ret = get_user(x, __uptr); \
56 #define put_guest(vcpu, x, gptr) \
58 __typeof__(gptr) __uptr = __gptr_to_uptr(vcpu, gptr, 1);\
59 int __mask = sizeof(__typeof__(*(gptr))) - 1; \
62 if (IS_ERR((void __force *)__uptr)) { \
63 __ret = PTR_ERR((void __force *)__uptr); \
65 BUG_ON((unsigned long)__uptr & __mask); \
66 __ret = put_user(x, __uptr); \
71 static inline int __copy_guest(struct kvm_vcpu *vcpu, unsigned long to,
72 unsigned long from, unsigned long len,
73 int to_guest, int prefixing)
75 unsigned long _len, rc;
79 uptr = to_guest ? (void __user *)to : (void __user *)from;
80 uptr = __gptr_to_uptr(vcpu, uptr, prefixing);
81 if (IS_ERR((void __force *)uptr))
83 _len = PAGE_SIZE - ((unsigned long)uptr & (PAGE_SIZE - 1));
84 _len = min(_len, len);
86 rc = copy_to_user((void __user *) uptr, (void *)from, _len);
88 rc = copy_from_user((void *)to, (void __user *)uptr, _len);
98 #define copy_to_guest(vcpu, to, from, size) \
99 __copy_guest(vcpu, to, (unsigned long)from, size, 1, 1)
100 #define copy_from_guest(vcpu, to, from, size) \
101 __copy_guest(vcpu, (unsigned long)to, from, size, 0, 1)
102 #define copy_to_guest_absolute(vcpu, to, from, size) \
103 __copy_guest(vcpu, to, (unsigned long)from, size, 1, 0)
104 #define copy_from_guest_absolute(vcpu, to, from, size) \
105 __copy_guest(vcpu, (unsigned long)to, from, size, 0, 0)
107 #endif /* __KVM_S390_GACCESS_H */