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- /*
- * access guest memory
- *
- * Copyright IBM Corp. 2008, 2009
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License (version 2 only)
- * as published by the Free Software Foundation.
- *
- * Author(s): Carsten Otte <cotte@de.ibm.com>
- */
- #ifndef __KVM_S390_GACCESS_H
- #define __KVM_S390_GACCESS_H
- #include <linux/compiler.h>
- #include <linux/kvm_host.h>
- #include <asm/uaccess.h>
- #include "kvm-s390.h"
- static inline void __user *__gptr_to_uptr(struct kvm_vcpu *vcpu,
- void __user *gptr,
- int prefixing)
- {
- unsigned long prefix = vcpu->arch.sie_block->prefix;
- unsigned long gaddr = (unsigned long) gptr;
- unsigned long uaddr;
- if (prefixing) {
- if (gaddr < 2 * PAGE_SIZE)
- gaddr += prefix;
- else if ((gaddr >= prefix) && (gaddr < prefix + 2 * PAGE_SIZE))
- gaddr -= prefix;
- }
- uaddr = gmap_fault(gaddr, vcpu->arch.gmap);
- if (IS_ERR_VALUE(uaddr))
- uaddr = -EFAULT;
- return (void __user *)uaddr;
- }
- #define get_guest(vcpu, x, gptr) \
- ({ \
- __typeof__(gptr) __uptr = __gptr_to_uptr(vcpu, gptr, 1);\
- int __mask = sizeof(__typeof__(*(gptr))) - 1; \
- int __ret = PTR_RET((void __force *)__uptr); \
- \
- if (!__ret) { \
- BUG_ON((unsigned long)__uptr & __mask); \
- __ret = get_user(x, __uptr); \
- } \
- __ret; \
- })
- #define put_guest(vcpu, x, gptr) \
- ({ \
- __typeof__(gptr) __uptr = __gptr_to_uptr(vcpu, gptr, 1);\
- int __mask = sizeof(__typeof__(*(gptr))) - 1; \
- int __ret = PTR_RET((void __force *)__uptr); \
- \
- if (!__ret) { \
- BUG_ON((unsigned long)__uptr & __mask); \
- __ret = put_user(x, __uptr); \
- } \
- __ret; \
- })
- static inline int __copy_guest(struct kvm_vcpu *vcpu, unsigned long to,
- unsigned long from, unsigned long len,
- int to_guest, int prefixing)
- {
- unsigned long _len, rc;
- void __user *uptr;
- while (len) {
- uptr = to_guest ? (void __user *)to : (void __user *)from;
- uptr = __gptr_to_uptr(vcpu, uptr, prefixing);
- if (IS_ERR((void __force *)uptr))
- return -EFAULT;
- _len = PAGE_SIZE - ((unsigned long)uptr & (PAGE_SIZE - 1));
- _len = min(_len, len);
- if (to_guest)
- rc = copy_to_user((void __user *) uptr, (void *)from, _len);
- else
- rc = copy_from_user((void *)to, (void __user *)uptr, _len);
- if (rc)
- return -EFAULT;
- len -= _len;
- from += _len;
- to += _len;
- }
- return 0;
- }
- #define copy_to_guest(vcpu, to, from, size) \
- __copy_guest(vcpu, to, (unsigned long)from, size, 1, 1)
- #define copy_from_guest(vcpu, to, from, size) \
- __copy_guest(vcpu, (unsigned long)to, from, size, 0, 1)
- #define copy_to_guest_absolute(vcpu, to, from, size) \
- __copy_guest(vcpu, to, (unsigned long)from, size, 1, 0)
- #define copy_from_guest_absolute(vcpu, to, from, size) \
- __copy_guest(vcpu, (unsigned long)to, from, size, 0, 0)
- #endif /* __KVM_S390_GACCESS_H */
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