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/******************************************************************************
* guest_access.h
*
* Copyright (c) 2006, K A Fraser
*/
#ifndef __ASM_X86_GUEST_ACCESS_H__
#define __ASM_X86_GUEST_ACCESS_H__
#include <asm/uaccess.h>
#include <asm/paging.h>
#include <asm/hvm/support.h>
#include <asm/hvm/guest_access.h>
/* Raw access functions: no type checking. */
#define raw_copy_to_guest(dst, src, len) \
(is_hvm_vcpu(current) ? \
copy_to_user_hvm((dst), (src), (len)) : \
copy_to_user((dst), (src), (len)))
#define raw_copy_from_guest(dst, src, len) \
(is_hvm_vcpu(current) ? \
copy_from_user_hvm((dst), (src), (len)) : \
copy_from_user((dst), (src), (len)))
#define raw_clear_guest(dst, len) \
(is_hvm_vcpu(current) ? \
clear_user_hvm((dst), (len)) : \
clear_user((dst), (len)))
#define __raw_copy_to_guest(dst, src, len) \
(is_hvm_vcpu(current) ? \
copy_to_user_hvm((dst), (src), (len)) : \
__copy_to_user((dst), (src), (len)))
#define __raw_copy_from_guest(dst, src, len) \
(is_hvm_vcpu(current) ? \
copy_from_user_hvm((dst), (src), (len)) : \
__copy_from_user((dst), (src), (len)))
#define __raw_clear_guest(dst, len) \
(is_hvm_vcpu(current) ? \
clear_user_hvm((dst), (len)) : \
clear_user((dst), (len)))
/* Is the guest handle a NULL reference? */
#define guest_handle_is_null(hnd) ((hnd).p == NULL)
/* Offset the given guest handle into the array it refers to. */
#define guest_handle_add_offset(hnd, nr) ((hnd).p += (nr))
#define guest_handle_subtract_offset(hnd, nr) ((hnd).p -= (nr))
/* Cast a guest handle (either XEN_GUEST_HANDLE or XEN_GUEST_HANDLE_PARAM)
* to the specified type of XEN_GUEST_HANDLE_PARAM. */
#define guest_handle_cast(hnd, type) ({ \
type *_x = (hnd).p; \
(XEN_GUEST_HANDLE_PARAM(type)) { _x }; \
})
/* Cast a XEN_GUEST_HANDLE to XEN_GUEST_HANDLE_PARAM */
#define guest_handle_to_param(hnd, type) ({ \
/* type checking: make sure that the pointers inside \
* XEN_GUEST_HANDLE and XEN_GUEST_HANDLE_PARAM are of \
* the same type, then return hnd */ \
(void)((typeof(&(hnd).p)) 0 == \
(typeof(&((XEN_GUEST_HANDLE_PARAM(type)) {}).p)) 0); \
(hnd); \
})
/* Cast a XEN_GUEST_HANDLE_PARAM to XEN_GUEST_HANDLE */
#define guest_handle_from_param(hnd, type) ({ \
/* type checking: make sure that the pointers inside \
* XEN_GUEST_HANDLE and XEN_GUEST_HANDLE_PARAM are of \
* the same type, then return hnd */ \
(void)((typeof(&(hnd).p)) 0 == \
(typeof(&((XEN_GUEST_HANDLE_PARAM(type)) {}).p)) 0); \
(hnd); \
})
#define guest_handle_for_field(hnd, type, fld) \
((XEN_GUEST_HANDLE(type)) { &(hnd).p->fld })
#define guest_handle_from_ptr(ptr, type) \
((XEN_GUEST_HANDLE_PARAM(type)) { (type *)ptr })
#define const_guest_handle_from_ptr(ptr, type) \
((XEN_GUEST_HANDLE_PARAM(const_##type)) { (const type *)ptr })
/*
* Copy an array of objects to guest context via a guest handle,
* specifying an offset into the guest array.
*/
#define copy_to_guest_offset(hnd, off, ptr, nr) ({ \
const typeof(*(ptr)) *_s = (ptr); \
char (*_d)[sizeof(*_s)] = (void *)(hnd).p; \
((void)((hnd).p == (ptr))); \
raw_copy_to_guest(_d+(off), _s, sizeof(*_s)*(nr)); \
})
/*
* Copy an array of objects from guest context via a guest handle,
* specifying an offset into the guest array.
*/
#define copy_from_guest_offset(ptr, hnd, off, nr) ({ \
const typeof(*(ptr)) *_s = (hnd).p; \
typeof(*(ptr)) *_d = (ptr); \
raw_copy_from_guest(_d, _s+(off), sizeof(*_d)*(nr));\
})
#define clear_guest_offset(hnd, off, nr) ({ \
void *_d = (hnd).p; \
raw_clear_guest(_d+(off), nr); \
})
/* Copy sub-field of a structure to guest context via a guest handle. */
#define copy_field_to_guest(hnd, ptr, field) ({ \
const typeof(&(ptr)->field) _s = &(ptr)->field; \
void *_d = &(hnd).p->field; \
((void)(&(hnd).p->field == &(ptr)->field)); \
raw_copy_to_guest(_d, _s, sizeof(*_s)); \
})
/* Copy sub-field of a structure from guest context via a guest handle. */
#define copy_field_from_guest(ptr, hnd, field) ({ \
const typeof(&(ptr)->field) _s = &(hnd).p->field; \
typeof(&(ptr)->field) _d = &(ptr)->field; \
raw_copy_from_guest(_d, _s, sizeof(*_d)); \
})
/*
* Pre-validate a guest handle.
* Allows use of faster __copy_* functions.
*/
#define guest_handle_okay(hnd, nr) \
(paging_mode_external(current->domain) || \
array_access_ok((hnd).p, (nr), sizeof(*(hnd).p)))
#define guest_handle_subrange_okay(hnd, first, last) \
(paging_mode_external(current->domain) || \
array_access_ok((hnd).p + (first), \
(last)-(first)+1, \
sizeof(*(hnd).p)))
#define __copy_to_guest_offset(hnd, off, ptr, nr) ({ \
const typeof(*(ptr)) *_s = (ptr); \
char (*_d)[sizeof(*_s)] = (void *)(hnd).p; \
((void)((hnd).p == (ptr))); \
__raw_copy_to_guest(_d+(off), _s, sizeof(*_s)*(nr));\
})
#define __copy_from_guest_offset(ptr, hnd, off, nr) ({ \
const typeof(*(ptr)) *_s = (hnd).p; \
typeof(*(ptr)) *_d = (ptr); \
__raw_copy_from_guest(_d, _s+(off), sizeof(*_d)*(nr));\
})
#define __clear_guest_offset(hnd, off, nr) ({ \
void *_d = (hnd).p; \
__raw_clear_guest(_d+(off), nr); \
})
#define __copy_field_to_guest(hnd, ptr, field) ({ \
const typeof(&(ptr)->field) _s = &(ptr)->field; \
void *_d = &(hnd).p->field; \
((void)(&(hnd).p->field == &(ptr)->field)); \
__raw_copy_to_guest(_d, _s, sizeof(*_s)); \
})
#define __copy_field_from_guest(ptr, hnd, field) ({ \
const typeof(&(ptr)->field) _s = &(hnd).p->field; \
typeof(&(ptr)->field) _d = &(ptr)->field; \
__raw_copy_from_guest(_d, _s, sizeof(*_d)); \
})
#endif /* __ASM_X86_GUEST_ACCESS_H__ */
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