[PATCH v6 11/14] KVM: s390: Refactor absolute vcpu mem_op function

Janis Schoetterl-Glausch
2023-01-25T21:26:35Z

Remove code duplication with regards to the CHECK_ONLY flag.
Decrease the number of indents.
No functional change indented.

Suggested-by: Janosch Frank <frankja@linux.ibm.com>
Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
---

Cosmetic only, can be dropped.

arch/s390/kvm/kvm-s390.c | 34 +++++++++++++++-------------------
1 file changed, 15 insertions(+), 19 deletions(-)

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index cfd09cb43ef6..4b8b41be7aed 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -5262,6 +5262,7 @@ static long kvm_s390_vcpu_mem_op(struct kvm_vcpu *vcpu,
struct kvm_s390_mem_op *mop)
{
void __user *uaddr = (void __user *)mop->buf;
+ enum gacc_mode acc_mode;
void *tmpbuf = NULL;
int r;

@@ -5278,38 +5279,33 @@ static long kvm_s390_vcpu_mem_op(struct kvm_vcpu *vcpu,
if (IS_ERR(tmpbuf))
return PTR_ERR(tmpbuf);

- switch (mop->op) {
- case KVM_S390_MEMOP_LOGICAL_READ:
- if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
- r = check_gva_range(vcpu, mop->gaddr, mop->ar, mop->size,
- GACC_FETCH, mop->key);
- break;
- }
+ acc_mode = mop->op == KVM_S390_MEMOP_LOGICAL_READ ? GACC_FETCH : GACC_STORE;
+ if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
+ r = check_gva_range(vcpu, mop->gaddr, mop->ar, mop->size,
+ acc_mode, mop->key);
+ } else if (acc_mode == GACC_FETCH) {
r = read_guest_with_key(vcpu, mop->gaddr, mop->ar, tmpbuf,
mop->size, mop->key);
- if (r == 0) {
- if (copy_to_user(uaddr, tmpbuf, mop->size))
- r = -EFAULT;
- }
- break;
- case KVM_S390_MEMOP_LOGICAL_WRITE:
- if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
- r = check_gva_range(vcpu, mop->gaddr, mop->ar, mop->size,
- GACC_STORE, mop->key);
- break;
+ if (r)
+ goto out_inject;
+ if (copy_to_user(uaddr, tmpbuf, mop->size)) {
+ r = -EFAULT;
+ goto out_free;
}
+ } else {
if (copy_from_user(tmpbuf, uaddr, mop->size)) {
r = -EFAULT;
- break;
+ goto out_free;
}
r = write_guest_with_key(vcpu, mop->gaddr, mop->ar, tmpbuf,
mop->size, mop->key);
- break;
}

+out_inject:
if (r > 0 && (mop->flags & KVM_S390_MEMOP_F_INJECT_EXCEPTION) != 0)
kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);

+out_free:
vfree(tmpbuf);
return r;
}
--
2.34.1