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authorHeiko Carstens <heiko.carstens@de.ibm.com>2013-03-05 13:14:44 +0100
committerMarcelo Tosatti <mtosatti@redhat.com>2013-03-07 16:21:21 -0300
commit396083a964aa4e86061d0e3449b1e0548a8197a9 (patch)
tree1f0185c6fe56964a4eaaa96ba9c3eac6e32934ff /arch/s390
parentdc5008b9bf6adb0c0a5afba6fb376a85451b2697 (diff)
downloadblackbird-op-linux-396083a964aa4e86061d0e3449b1e0548a8197a9.tar.gz
blackbird-op-linux-396083a964aa4e86061d0e3449b1e0548a8197a9.zip
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>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/kvm/gaccess.h153
-rw-r--r--arch/s390/kvm/intercept.c6
-rw-r--r--arch/s390/kvm/interrupt.c52
-rw-r--r--arch/s390/kvm/priv.c22
4 files changed, 81 insertions, 152 deletions
diff --git a/arch/s390/kvm/gaccess.h b/arch/s390/kvm/gaccess.h
index 84d01dd7a8e4..82f450ecb585 100644
--- a/arch/s390/kvm/gaccess.h
+++ b/arch/s390/kvm/gaccess.h
@@ -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;
-
- 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;
-}
-
-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);
+ unsigned long gaddr = (unsigned long) gptr;
+ unsigned long uaddr;
+
+ 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;
}
+#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;
}
diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c
index 9b2204759445..64744003a66e 100644
--- a/arch/s390/kvm/intercept.c
+++ b/arch/s390/kvm/intercept.c
@@ -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;
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 5afa931aed11..d78824b18e9d 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -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,
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index 34b42dc285ee..cb07147cda73 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -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;
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