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authorHeiko Carstens <heiko.carstens@de.ibm.com>2014-01-01 16:47:12 +0100
committerChristian Borntraeger <borntraeger@de.ibm.com>2014-04-22 13:24:42 +0200
commit665170cb47acbddc202df0d8487ca867b64e1604 (patch)
tree05f5034f64d609a977435c940e88c050a5b9dec8 /arch/s390/kvm
parentd0bce6054a1759f1b2c86bf553801c77dcaca745 (diff)
downloadop-kernel-dev-665170cb47acbddc202df0d8487ca867b64e1604.zip
op-kernel-dev-665170cb47acbddc202df0d8487ca867b64e1604.tar.gz
KVM: s390: convert __sigp_set_prefix()/handle_set_prefix()
Convert __sigp_set_prefix() and handle_set_prefix() to new guest access functions. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Reviewed-by: Thomas Huth <thuth@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/kvm')
-rw-r--r--arch/s390/kvm/priv.c20
-rw-r--r--arch/s390/kvm/sigp.c12
2 files changed, 19 insertions, 13 deletions
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index 7066fc5..dd6ad84 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -65,8 +65,8 @@ static int handle_set_clock(struct kvm_vcpu *vcpu)
static int handle_set_prefix(struct kvm_vcpu *vcpu)
{
u64 operand2;
- u32 address = 0;
- u8 tmp;
+ u32 address;
+ int rc;
vcpu->stat.instruction_spx++;
@@ -80,14 +80,18 @@ static int handle_set_prefix(struct kvm_vcpu *vcpu)
return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
/* get the value */
- if (get_guest(vcpu, address, (u32 __user *) operand2))
- return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
+ rc = read_guest(vcpu, operand2, &address, sizeof(address));
+ if (rc)
+ return kvm_s390_inject_prog_cond(vcpu, rc);
- address = address & 0x7fffe000u;
+ address &= 0x7fffe000u;
- /* make sure that the new value is valid memory */
- if (copy_from_guest_absolute(vcpu, &tmp, address, 1) ||
- (copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)))
+ /*
+ * Make sure the new value is valid memory. We only need to check the
+ * first page, since address is 8k aligned and memory pieces are always
+ * at least 1MB aligned and have at least a size of 1MB.
+ */
+ if (kvm_is_error_gpa(vcpu->kvm, address))
return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
kvm_s390_set_prefix(vcpu, address);
diff --git a/arch/s390/kvm/sigp.c b/arch/s390/kvm/sigp.c
index 26caeb5..c0b99e0 100644
--- a/arch/s390/kvm/sigp.c
+++ b/arch/s390/kvm/sigp.c
@@ -235,7 +235,6 @@ static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
struct kvm_vcpu *dst_vcpu = NULL;
struct kvm_s390_interrupt_info *inti;
int rc;
- u8 tmp;
if (cpu_addr < KVM_MAX_VCPUS)
dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
@@ -243,10 +242,13 @@ static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
return SIGP_CC_NOT_OPERATIONAL;
li = &dst_vcpu->arch.local_int;
- /* make sure that the new value is valid memory */
- address = address & 0x7fffe000u;
- if (copy_from_guest_absolute(vcpu, &tmp, address, 1) ||
- copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)) {
+ /*
+ * Make sure the new value is valid memory. We only need to check the
+ * first page, since address is 8k aligned and memory pieces are always
+ * at least 1MB aligned and have at least a size of 1MB.
+ */
+ address &= 0x7fffe000u;
+ if (kvm_is_error_gpa(vcpu->kvm, address)) {
*reg &= 0xffffffff00000000UL;
*reg |= SIGP_STATUS_INVALID_PARAMETER;
return SIGP_CC_STATUS_STORED;
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