From 0d6d4d23955c8aaa69f361897ec1aad67bf93653 Mon Sep 17 00:00:00 2001 From: Janis Schoetterl-Glausch Date: Mon, 6 Feb 2023 17:45:58 +0100 Subject: KVM: s390: Refactor absolute vm mem_op function Remove code duplication with regards to the CHECK_ONLY flag. Decrease the number of indents. No functional change indented. Suggested-by: Janosch Frank Signed-off-by: Janis Schoetterl-Glausch Reviewed-by: Thomas Huth Reviewed-by: Janosch Frank Link: https://lore.kernel.org/r/20230206164602.138068-11-scgl@linux.ibm.com Message-Id: <20230206164602.138068-11-scgl@linux.ibm.com> Signed-off-by: Janosch Frank --- arch/s390/kvm/kvm-s390.c | 43 ++++++++++++++++++------------------------- 1 file changed, 18 insertions(+), 25 deletions(-) (limited to 'arch/s390/kvm/kvm-s390.c') diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 0053b1fbfc76..23f50437a328 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -2782,6 +2782,7 @@ static int mem_op_validate_common(struct kvm_s390_mem_op *mop, u64 supported_fla static int kvm_s390_vm_mem_op_abs(struct kvm *kvm, struct kvm_s390_mem_op *mop) { void __user *uaddr = (void __user *)mop->buf; + enum gacc_mode acc_mode; void *tmpbuf = NULL; int r, srcu_idx; @@ -2803,33 +2804,25 @@ static int kvm_s390_vm_mem_op_abs(struct kvm *kvm, struct kvm_s390_mem_op *mop) goto out_unlock; } - switch (mop->op) { - case KVM_S390_MEMOP_ABSOLUTE_READ: { - if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) { - r = check_gpa_range(kvm, mop->gaddr, mop->size, GACC_FETCH, mop->key); - } else { - r = access_guest_abs_with_key(kvm, mop->gaddr, tmpbuf, - mop->size, GACC_FETCH, mop->key); - if (r == 0) { - if (copy_to_user(uaddr, tmpbuf, mop->size)) - r = -EFAULT; - } - } - break; + acc_mode = mop->op == KVM_S390_MEMOP_ABSOLUTE_READ ? GACC_FETCH : GACC_STORE; + if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) { + r = check_gpa_range(kvm, mop->gaddr, mop->size, acc_mode, mop->key); + goto out_unlock; } - case KVM_S390_MEMOP_ABSOLUTE_WRITE: { - if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) { - r = check_gpa_range(kvm, mop->gaddr, mop->size, GACC_STORE, mop->key); - } else { - if (copy_from_user(tmpbuf, uaddr, mop->size)) { - r = -EFAULT; - break; - } - r = access_guest_abs_with_key(kvm, mop->gaddr, tmpbuf, - mop->size, GACC_STORE, mop->key); + if (acc_mode == GACC_FETCH) { + r = access_guest_abs_with_key(kvm, mop->gaddr, tmpbuf, + mop->size, GACC_FETCH, mop->key); + if (r) + goto out_unlock; + if (copy_to_user(uaddr, tmpbuf, mop->size)) + r = -EFAULT; + } else { + if (copy_from_user(tmpbuf, uaddr, mop->size)) { + r = -EFAULT; + goto out_unlock; } - break; - } + r = access_guest_abs_with_key(kvm, mop->gaddr, tmpbuf, + mop->size, GACC_STORE, mop->key); } out_unlock: -- cgit