From 665170cb47acbddc202df0d8487ca867b64e1604 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Wed, 1 Jan 2014 16:47:12 +0100 Subject: 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 Reviewed-by: Thomas Huth Signed-off-by: Christian Borntraeger --- arch/s390/kvm/sigp.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) (limited to 'arch/s390/kvm/sigp.c') 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; -- cgit v1.2.3