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authorHeiko Carstens <heiko.carstens@de.ibm.com>2014-01-01 19:47:12 +0400
committerChristian Borntraeger <borntraeger@de.ibm.com>2014-04-22 15:24:42 +0400
commit665170cb47acbddc202df0d8487ca867b64e1604 (patch)
tree05f5034f64d609a977435c940e88c050a5b9dec8 /arch/s390/kvm/sigp.c
parentd0bce6054a1759f1b2c86bf553801c77dcaca745 (diff)
downloadlinux-665170cb47acbddc202df0d8487ca867b64e1604.tar.xz
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/sigp.c')
-rw-r--r--arch/s390/kvm/sigp.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/arch/s390/kvm/sigp.c b/arch/s390/kvm/sigp.c
index 26caeb530a78..c0b99e0f6b63 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;