mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
synced 2024-09-21 03:43:03 +00:00
a53c8fab3f
Remove the file name from the comment at top of many files. In most cases the file name was wrong anyway, so it's rather pointless. Also unify the IBM copyright statement. We did have a lot of sightly different statements and wanted to change them one after another whenever a file gets touched. However that never happened. Instead people start to take the old/"wrong" statements to use as a template for new files. So unify all of them in one go. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
387 lines
8.5 KiB
C
387 lines
8.5 KiB
C
/*
|
|
* 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 *__guestaddr_to_user(struct kvm_vcpu *vcpu,
|
|
unsigned long guestaddr)
|
|
{
|
|
unsigned long prefix = vcpu->arch.sie_block->prefix;
|
|
|
|
if (guestaddr < 2 * PAGE_SIZE)
|
|
guestaddr += prefix;
|
|
else if ((guestaddr >= prefix) && (guestaddr < prefix + 2 * PAGE_SIZE))
|
|
guestaddr -= prefix;
|
|
|
|
return (void __user *) gmap_fault(guestaddr, vcpu->arch.gmap);
|
|
}
|
|
|
|
static inline int get_guest_u64(struct kvm_vcpu *vcpu, unsigned long guestaddr,
|
|
u64 *result)
|
|
{
|
|
void __user *uptr = __guestaddr_to_user(vcpu, guestaddr);
|
|
|
|
BUG_ON(guestaddr & 7);
|
|
|
|
if (IS_ERR((void __force *) uptr))
|
|
return PTR_ERR((void __force *) uptr);
|
|
|
|
return get_user(*result, (unsigned long __user *) uptr);
|
|
}
|
|
|
|
static inline int get_guest_u32(struct kvm_vcpu *vcpu, unsigned long guestaddr,
|
|
u32 *result)
|
|
{
|
|
void __user *uptr = __guestaddr_to_user(vcpu, guestaddr);
|
|
|
|
BUG_ON(guestaddr & 3);
|
|
|
|
if (IS_ERR((void __force *) uptr))
|
|
return PTR_ERR((void __force *) uptr);
|
|
|
|
return get_user(*result, (u32 __user *) uptr);
|
|
}
|
|
|
|
static inline int get_guest_u16(struct kvm_vcpu *vcpu, unsigned long guestaddr,
|
|
u16 *result)
|
|
{
|
|
void __user *uptr = __guestaddr_to_user(vcpu, guestaddr);
|
|
|
|
BUG_ON(guestaddr & 1);
|
|
|
|
if (IS_ERR(uptr))
|
|
return PTR_ERR(uptr);
|
|
|
|
return get_user(*result, (u16 __user *) uptr);
|
|
}
|
|
|
|
static inline int get_guest_u8(struct kvm_vcpu *vcpu, unsigned long guestaddr,
|
|
u8 *result)
|
|
{
|
|
void __user *uptr = __guestaddr_to_user(vcpu, guestaddr);
|
|
|
|
if (IS_ERR((void __force *) uptr))
|
|
return PTR_ERR((void __force *) uptr);
|
|
|
|
return get_user(*result, (u8 __user *) uptr);
|
|
}
|
|
|
|
static inline int put_guest_u64(struct kvm_vcpu *vcpu, unsigned long guestaddr,
|
|
u64 value)
|
|
{
|
|
void __user *uptr = __guestaddr_to_user(vcpu, guestaddr);
|
|
|
|
BUG_ON(guestaddr & 7);
|
|
|
|
if (IS_ERR((void __force *) uptr))
|
|
return PTR_ERR((void __force *) uptr);
|
|
|
|
return put_user(value, (u64 __user *) uptr);
|
|
}
|
|
|
|
static inline int put_guest_u32(struct kvm_vcpu *vcpu, unsigned long guestaddr,
|
|
u32 value)
|
|
{
|
|
void __user *uptr = __guestaddr_to_user(vcpu, guestaddr);
|
|
|
|
BUG_ON(guestaddr & 3);
|
|
|
|
if (IS_ERR((void __force *) uptr))
|
|
return PTR_ERR((void __force *) uptr);
|
|
|
|
return put_user(value, (u32 __user *) uptr);
|
|
}
|
|
|
|
static inline int put_guest_u16(struct kvm_vcpu *vcpu, unsigned long guestaddr,
|
|
u16 value)
|
|
{
|
|
void __user *uptr = __guestaddr_to_user(vcpu, guestaddr);
|
|
|
|
BUG_ON(guestaddr & 1);
|
|
|
|
if (IS_ERR((void __force *) uptr))
|
|
return PTR_ERR((void __force *) uptr);
|
|
|
|
return put_user(value, (u16 __user *) uptr);
|
|
}
|
|
|
|
static inline int put_guest_u8(struct kvm_vcpu *vcpu, unsigned long guestaddr,
|
|
u8 value)
|
|
{
|
|
void __user *uptr = __guestaddr_to_user(vcpu, guestaddr);
|
|
|
|
if (IS_ERR((void __force *) uptr))
|
|
return PTR_ERR((void __force *) uptr);
|
|
|
|
return put_user(value, (u8 __user *) uptr);
|
|
}
|
|
|
|
|
|
static inline int __copy_to_guest_slow(struct kvm_vcpu *vcpu,
|
|
unsigned long guestdest,
|
|
void *from, unsigned long n)
|
|
{
|
|
int rc;
|
|
unsigned long i;
|
|
u8 *data = from;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
rc = put_guest_u8(vcpu, guestdest++, *(data++));
|
|
if (rc < 0)
|
|
return rc;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline int __copy_to_guest_fast(struct kvm_vcpu *vcpu,
|
|
unsigned long guestdest,
|
|
void *from, unsigned long n)
|
|
{
|
|
int r;
|
|
void __user *uptr;
|
|
unsigned long size;
|
|
|
|
if (guestdest + n < guestdest)
|
|
return -EFAULT;
|
|
|
|
/* simple case: all within one segment table entry? */
|
|
if ((guestdest & PMD_MASK) == ((guestdest+n) & PMD_MASK)) {
|
|
uptr = (void __user *) gmap_fault(guestdest, vcpu->arch.gmap);
|
|
|
|
if (IS_ERR((void __force *) uptr))
|
|
return PTR_ERR((void __force *) uptr);
|
|
|
|
r = copy_to_user(uptr, from, n);
|
|
|
|
if (r)
|
|
r = -EFAULT;
|
|
|
|
goto out;
|
|
}
|
|
|
|
/* copy first segment */
|
|
uptr = (void __user *)gmap_fault(guestdest, vcpu->arch.gmap);
|
|
|
|
if (IS_ERR((void __force *) uptr))
|
|
return PTR_ERR((void __force *) uptr);
|
|
|
|
size = PMD_SIZE - (guestdest & ~PMD_MASK);
|
|
|
|
r = copy_to_user(uptr, from, size);
|
|
|
|
if (r) {
|
|
r = -EFAULT;
|
|
goto out;
|
|
}
|
|
from += size;
|
|
n -= size;
|
|
guestdest += size;
|
|
|
|
/* copy full segments */
|
|
while (n >= PMD_SIZE) {
|
|
uptr = (void __user *)gmap_fault(guestdest, vcpu->arch.gmap);
|
|
|
|
if (IS_ERR((void __force *) uptr))
|
|
return PTR_ERR((void __force *) uptr);
|
|
|
|
r = copy_to_user(uptr, from, PMD_SIZE);
|
|
|
|
if (r) {
|
|
r = -EFAULT;
|
|
goto out;
|
|
}
|
|
from += PMD_SIZE;
|
|
n -= PMD_SIZE;
|
|
guestdest += PMD_SIZE;
|
|
}
|
|
|
|
/* copy the tail segment */
|
|
if (n) {
|
|
uptr = (void __user *)gmap_fault(guestdest, vcpu->arch.gmap);
|
|
|
|
if (IS_ERR((void __force *) uptr))
|
|
return PTR_ERR((void __force *) uptr);
|
|
|
|
r = copy_to_user(uptr, from, n);
|
|
|
|
if (r)
|
|
r = -EFAULT;
|
|
}
|
|
out:
|
|
return r;
|
|
}
|
|
|
|
static inline int copy_to_guest_absolute(struct kvm_vcpu *vcpu,
|
|
unsigned long guestdest,
|
|
void *from, unsigned long n)
|
|
{
|
|
return __copy_to_guest_fast(vcpu, guestdest, from, n);
|
|
}
|
|
|
|
static inline int copy_to_guest(struct kvm_vcpu *vcpu, unsigned long guestdest,
|
|
void *from, unsigned long n)
|
|
{
|
|
unsigned long prefix = vcpu->arch.sie_block->prefix;
|
|
|
|
if ((guestdest < 2 * PAGE_SIZE) && (guestdest + n > 2 * PAGE_SIZE))
|
|
goto slowpath;
|
|
|
|
if ((guestdest < prefix) && (guestdest + n > prefix))
|
|
goto slowpath;
|
|
|
|
if ((guestdest < prefix + 2 * PAGE_SIZE)
|
|
&& (guestdest + n > prefix + 2 * PAGE_SIZE))
|
|
goto slowpath;
|
|
|
|
if (guestdest < 2 * PAGE_SIZE)
|
|
guestdest += prefix;
|
|
else if ((guestdest >= prefix) && (guestdest < prefix + 2 * PAGE_SIZE))
|
|
guestdest -= prefix;
|
|
|
|
return __copy_to_guest_fast(vcpu, guestdest, from, n);
|
|
slowpath:
|
|
return __copy_to_guest_slow(vcpu, guestdest, from, n);
|
|
}
|
|
|
|
static inline int __copy_from_guest_slow(struct kvm_vcpu *vcpu, void *to,
|
|
unsigned long guestsrc,
|
|
unsigned long n)
|
|
{
|
|
int rc;
|
|
unsigned long i;
|
|
u8 *data = to;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
rc = get_guest_u8(vcpu, guestsrc++, data++);
|
|
if (rc < 0)
|
|
return rc;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline int __copy_from_guest_fast(struct kvm_vcpu *vcpu, void *to,
|
|
unsigned long guestsrc,
|
|
unsigned long n)
|
|
{
|
|
int r;
|
|
void __user *uptr;
|
|
unsigned long size;
|
|
|
|
if (guestsrc + n < guestsrc)
|
|
return -EFAULT;
|
|
|
|
/* simple case: all within one segment table entry? */
|
|
if ((guestsrc & PMD_MASK) == ((guestsrc+n) & PMD_MASK)) {
|
|
uptr = (void __user *) gmap_fault(guestsrc, vcpu->arch.gmap);
|
|
|
|
if (IS_ERR((void __force *) uptr))
|
|
return PTR_ERR((void __force *) uptr);
|
|
|
|
r = copy_from_user(to, uptr, n);
|
|
|
|
if (r)
|
|
r = -EFAULT;
|
|
|
|
goto out;
|
|
}
|
|
|
|
/* copy first segment */
|
|
uptr = (void __user *)gmap_fault(guestsrc, vcpu->arch.gmap);
|
|
|
|
if (IS_ERR((void __force *) uptr))
|
|
return PTR_ERR((void __force *) uptr);
|
|
|
|
size = PMD_SIZE - (guestsrc & ~PMD_MASK);
|
|
|
|
r = copy_from_user(to, uptr, size);
|
|
|
|
if (r) {
|
|
r = -EFAULT;
|
|
goto out;
|
|
}
|
|
to += size;
|
|
n -= size;
|
|
guestsrc += size;
|
|
|
|
/* copy full segments */
|
|
while (n >= PMD_SIZE) {
|
|
uptr = (void __user *)gmap_fault(guestsrc, vcpu->arch.gmap);
|
|
|
|
if (IS_ERR((void __force *) uptr))
|
|
return PTR_ERR((void __force *) uptr);
|
|
|
|
r = copy_from_user(to, uptr, PMD_SIZE);
|
|
|
|
if (r) {
|
|
r = -EFAULT;
|
|
goto out;
|
|
}
|
|
to += PMD_SIZE;
|
|
n -= PMD_SIZE;
|
|
guestsrc += PMD_SIZE;
|
|
}
|
|
|
|
/* copy the tail segment */
|
|
if (n) {
|
|
uptr = (void __user *)gmap_fault(guestsrc, vcpu->arch.gmap);
|
|
|
|
if (IS_ERR((void __force *) uptr))
|
|
return PTR_ERR((void __force *) uptr);
|
|
|
|
r = copy_from_user(to, uptr, n);
|
|
|
|
if (r)
|
|
r = -EFAULT;
|
|
}
|
|
out:
|
|
return r;
|
|
}
|
|
|
|
static inline int copy_from_guest_absolute(struct kvm_vcpu *vcpu, void *to,
|
|
unsigned long guestsrc,
|
|
unsigned long n)
|
|
{
|
|
return __copy_from_guest_fast(vcpu, to, guestsrc, n);
|
|
}
|
|
|
|
static inline int copy_from_guest(struct kvm_vcpu *vcpu, void *to,
|
|
unsigned long guestsrc, unsigned long n)
|
|
{
|
|
unsigned long prefix = vcpu->arch.sie_block->prefix;
|
|
|
|
if ((guestsrc < 2 * PAGE_SIZE) && (guestsrc + n > 2 * PAGE_SIZE))
|
|
goto slowpath;
|
|
|
|
if ((guestsrc < prefix) && (guestsrc + n > prefix))
|
|
goto slowpath;
|
|
|
|
if ((guestsrc < prefix + 2 * PAGE_SIZE)
|
|
&& (guestsrc + n > prefix + 2 * PAGE_SIZE))
|
|
goto slowpath;
|
|
|
|
if (guestsrc < 2 * PAGE_SIZE)
|
|
guestsrc += prefix;
|
|
else if ((guestsrc >= prefix) && (guestsrc < prefix + 2 * PAGE_SIZE))
|
|
guestsrc -= prefix;
|
|
|
|
return __copy_from_guest_fast(vcpu, to, guestsrc, n);
|
|
slowpath:
|
|
return __copy_from_guest_slow(vcpu, to, guestsrc, n);
|
|
}
|
|
#endif
|