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WSL2-Linux-Kernel
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s390/kvm,gaccess: shorten put/get_guest code 

The put_guest_u*/get_guest_u* are nothing but wrappers for the regular
put_user/get_user uaccess functions. The only difference is that before
accessing user space the guest address must be translated to a user space
address.
Change the order of arguments for the guest access functions so they
match their uaccess parts. Also remove the u* suffix, so we simply
have put_guest/get_guest which will automatically use the right size
dependent on pointer type of the destination/source that now must be
correct.
In result the same behaviour as put_user/get_user except that accesses
must be aligned.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Heiko Carstens 2013-03-05 13:14:44 +01:00 коммит произвёл Marcelo Tosatti
Родитель dc5008b9bf
Коммит 396083a964
4 изменённых файлов: 79 добавлений и 150 удалений
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149
arch/s390/kvm/gaccess.h
Просмотреть файл

@ -18,122 +18,47 @@
#include <asm/uaccess.h>
#include "kvm-s390.h"
static inline void __user *__guestaddr_to_user(struct kvm_vcpu *vcpu,
unsigned long guestaddr)
static inline void *__gptr_to_uptr(struct kvm_vcpu *vcpu, void *gptr)
{
unsigned long prefix = vcpu->arch.sie_block->prefix;
unsigned long uaddress;
unsigned long gaddr = (unsigned long) gptr;
unsigned long uaddr;
if (guestaddr < 2 * PAGE_SIZE)
guestaddr += prefix;
else if ((guestaddr >= prefix) && (guestaddr < prefix + 2 * PAGE_SIZE))
guestaddr -= prefix;
uaddress = gmap_fault(guestaddr, vcpu->arch.gmap);
if (IS_ERR_VALUE(uaddress))
uaddress = -EFAULT;
return (void __user *)uaddress;
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 *)uaddr;
}
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);
}
#define get_guest(vcpu, x, gptr) \
({ \
__typeof__(gptr) __uptr = __gptr_to_uptr(vcpu, gptr); \
int __mask = sizeof(__typeof__(*(gptr))) - 1; \
int __ret = PTR_RET(__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); \
int __mask = sizeof(__typeof__(*(gptr))) - 1; \
int __ret = PTR_RET(__uptr); \
\
if (!__ret) { \
BUG_ON((unsigned long)__uptr & __mask); \
__ret = put_user(x, __uptr); \
} \
__ret; \
})
static inline int __copy_to_guest_slow(struct kvm_vcpu *vcpu,
unsigned long guestdest,
@ -144,7 +69,7 @@ static inline int __copy_to_guest_slow(struct kvm_vcpu *vcpu,
u8 *data = from;
for (i = 0; i < n; i++) {
rc = put_guest_u8(vcpu, guestdest++, *(data++));
rc = put_guest(vcpu, *(data++), (u8 *)guestdest++);
if (rc < 0)
return rc;
}
@ -270,7 +195,7 @@ static inline int __copy_from_guest_slow(struct kvm_vcpu *vcpu, void *to,
u8 *data = to;
for (i = 0; i < n; i++) {
rc = get_guest_u8(vcpu, guestsrc++, data++);
rc = get_guest(vcpu, *(data++), (u8 *)guestsrc++);
if (rc < 0)
return rc;
}

6
arch/s390/kvm/intercept.c
Просмотреть файл

@ -43,8 +43,8 @@ static int handle_lctlg(struct kvm_vcpu *vcpu)
trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, useraddr);
do {
rc = get_guest_u64(vcpu, useraddr,
&vcpu->arch.sie_block->gcr[reg]);
rc = get_guest(vcpu, vcpu->arch.sie_block->gcr[reg],
(u64 *) useraddr);
if (rc) {
kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
break;
@ -78,7 +78,7 @@ static int handle_lctl(struct kvm_vcpu *vcpu)
reg = reg1;
do {
rc = get_guest_u32(vcpu, useraddr, &val);
rc = get_guest(vcpu, val, (u32 *) useraddr);
if (rc) {
kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
break;

52
arch/s390/kvm/interrupt.c
Просмотреть файл

@ -188,8 +188,9 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
vcpu->stat.deliver_emergency_signal++;
trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
inti->emerg.code, 0);
rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1201);
rc |= put_guest_u16(vcpu, __LC_EXT_CPU_ADDR, inti->emerg.code);
rc = put_guest(vcpu, 0x1201, (u16 *)__LC_EXT_INT_CODE);
rc |= put_guest(vcpu, inti->emerg.code,
(u16 *)__LC_EXT_CPU_ADDR);
rc |= copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
@ -200,8 +201,9 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
vcpu->stat.deliver_external_call++;
trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
inti->extcall.code, 0);
rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1202);
rc |= put_guest_u16(vcpu, __LC_EXT_CPU_ADDR, inti->extcall.code);
rc = put_guest(vcpu, 0x1202, (u16 *)__LC_EXT_INT_CODE);
rc |= put_guest(vcpu, inti->extcall.code,
(u16 *)__LC_EXT_CPU_ADDR);
rc |= copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
@ -213,12 +215,13 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
vcpu->stat.deliver_service_signal++;
trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
inti->ext.ext_params, 0);
rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2401);
rc = put_guest(vcpu, 0x2401, (u16 *)__LC_EXT_INT_CODE);
rc |= copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
__LC_EXT_NEW_PSW, sizeof(psw_t));
rc |= put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
rc |= put_guest(vcpu, inti->ext.ext_params,
(u32 *)__LC_EXT_PARAMS);
break;
case KVM_S390_INT_VIRTIO:
VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%llx",
@ -227,15 +230,16 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
inti->ext.ext_params,
inti->ext.ext_params2);
rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2603);
rc |= put_guest_u16(vcpu, __LC_EXT_CPU_ADDR, 0x0d00);
rc = put_guest(vcpu, 0x2603, (u16 *)__LC_EXT_INT_CODE);
rc |= put_guest(vcpu, 0x0d00, (u16 *)__LC_EXT_CPU_ADDR);
rc |= copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
__LC_EXT_NEW_PSW, sizeof(psw_t));
rc |= put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
rc |= put_guest_u64(vcpu, __LC_EXT_PARAMS2,
inti->ext.ext_params2);
rc |= put_guest(vcpu, inti->ext.ext_params,
(u32 *)__LC_EXT_PARAMS);
rc |= put_guest(vcpu, inti->ext.ext_params2,
(u64 *)__LC_EXT_PARAMS2);
break;
case KVM_S390_SIGP_STOP:
VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop");
@ -274,9 +278,9 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
vcpu->stat.deliver_program_int++;
trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
inti->pgm.code, 0);
rc = put_guest_u16(vcpu, __LC_PGM_INT_CODE, inti->pgm.code);
rc |= put_guest_u16(vcpu, __LC_PGM_ILC,
table[vcpu->arch.sie_block->ipa >> 14]);
rc = put_guest(vcpu, inti->pgm.code, (u16 *)__LC_PGM_INT_CODE);
rc |= put_guest(vcpu, table[vcpu->arch.sie_block->ipa >> 14],
(u16 *)__LC_PGM_ILC);
rc |= copy_to_guest(vcpu, __LC_PGM_OLD_PSW,
&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
@ -291,7 +295,7 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
inti->mchk.mcic);
rc = kvm_s390_vcpu_store_status(vcpu,
KVM_S390_STORE_STATUS_PREFIXED);
rc |= put_guest_u64(vcpu, __LC_MCCK_CODE, inti->mchk.mcic);
rc |= put_guest(vcpu, inti->mchk.mcic, (u64 *) __LC_MCCK_CODE);
rc |= copy_to_guest(vcpu, __LC_MCK_OLD_PSW,
&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
@ -308,14 +312,14 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
vcpu->stat.deliver_io_int++;
trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
param0, param1);
rc = put_guest_u16(vcpu, __LC_SUBCHANNEL_ID,
inti->io.subchannel_id);
rc |= put_guest_u16(vcpu, __LC_SUBCHANNEL_NR,
inti->io.subchannel_nr);
rc |= put_guest_u32(vcpu, __LC_IO_INT_PARM,
inti->io.io_int_parm);
rc |= put_guest_u32(vcpu, __LC_IO_INT_WORD,
inti->io.io_int_word);
rc = put_guest(vcpu, inti->io.subchannel_id,
(u16 *) __LC_SUBCHANNEL_ID);
rc |= put_guest(vcpu, inti->io.subchannel_nr,
(u16 *) __LC_SUBCHANNEL_NR);
rc |= put_guest(vcpu, inti->io.io_int_parm,
(u32 *) __LC_IO_INT_PARM);
rc |= put_guest(vcpu, inti->io.io_int_word,
(u32 *) __LC_IO_INT_WORD);
rc |= copy_to_guest(vcpu, __LC_IO_OLD_PSW,
&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
@ -340,7 +344,7 @@ static int __try_deliver_ckc_interrupt(struct kvm_vcpu *vcpu)
return 0;
if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
return 0;
rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1004);
rc = put_guest(vcpu, 0x1004, (u16 *)__LC_EXT_INT_CODE);
rc |= copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,

22
arch/s390/kvm/priv.c
Просмотреть файл

@ -41,7 +41,7 @@ static int handle_set_prefix(struct kvm_vcpu *vcpu)
}
/* get the value */
if (get_guest_u32(vcpu, operand2, &address)) {
if (get_guest(vcpu, address, (u32 *) operand2)) {
kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
goto out;
}
@ -82,7 +82,7 @@ static int handle_store_prefix(struct kvm_vcpu *vcpu)
address = address & 0x7fffe000u;
/* get the value */
if (put_guest_u32(vcpu, operand2, address)) {
if (put_guest(vcpu, address, (u32 *)operand2)) {
kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
goto out;
}
@ -107,7 +107,7 @@ static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
goto out;
}
rc = put_guest_u16(vcpu, useraddr, vcpu->vcpu_id);
rc = put_guest(vcpu, vcpu->vcpu_id, (u16 *)useraddr);
if (rc) {
kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
goto out;
@ -142,18 +142,18 @@ static int handle_tpi(struct kvm_vcpu *vcpu)
* Store the two-word I/O interruption code into the
* provided area.
*/
put_guest_u16(vcpu, addr, inti->io.subchannel_id);
put_guest_u16(vcpu, addr + 2, inti->io.subchannel_nr);
put_guest_u32(vcpu, addr + 4, inti->io.io_int_parm);
put_guest(vcpu, inti->io.subchannel_id, (u16 *) addr);
put_guest(vcpu, inti->io.subchannel_nr, (u16 *) (addr + 2));
put_guest(vcpu, inti->io.io_int_parm, (u32 *) (addr + 4));
} else {
/*
* Store the three-word I/O interruption code into
* the appropriate lowcore area.
*/
put_guest_u16(vcpu, 184, inti->io.subchannel_id);
put_guest_u16(vcpu, 186, inti->io.subchannel_nr);
put_guest_u32(vcpu, 188, inti->io.io_int_parm);
put_guest_u32(vcpu, 192, inti->io.io_int_word);
put_guest(vcpu, inti->io.subchannel_id, (u16 *) 184);
put_guest(vcpu, inti->io.subchannel_nr, (u16 *) 186);
put_guest(vcpu, inti->io.io_int_parm, (u32 *) 188);
put_guest(vcpu, inti->io.io_int_word, (u32 *) 192);
}
cc = 1;
} else
@ -347,7 +347,7 @@ static int handle_stidp(struct kvm_vcpu *vcpu)
goto out;
}
rc = put_guest_u64(vcpu, operand2, vcpu->arch.stidp_data);
rc = put_guest(vcpu, vcpu->arch.stidp_data, (u64 *)operand2);
if (rc) {
kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
goto out;