On 9/11/19 8:50 PM, Sean Christopherson wrote: > Replace a big pile o' gotos with returns to make it more obvious what > error code is being returned, and to prepare for refactoring the > functional, i.e. post-checks, portion of __kvm_set_memory_region(). > > Signed-off-by: Sean Christopherson <[email protected]>
Definitely necessary Reviewed-by: Janosch Frank <[email protected]> > --- > virt/kvm/kvm_main.c | 40 ++++++++++++++++++---------------------- > 1 file changed, 18 insertions(+), 22 deletions(-) > > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c > index ea8f2f37096f..8306ce3345a6 100644 > --- a/virt/kvm/kvm_main.c > +++ b/virt/kvm/kvm_main.c > @@ -929,34 +929,33 @@ int __kvm_set_memory_region(struct kvm *kvm, > > r = check_memory_region_flags(mem); > if (r) > - goto out; > + return r; > > - r = -EINVAL; > as_id = mem->slot >> 16; > id = (u16)mem->slot; > > /* General sanity checks */ > if (mem->memory_size & (PAGE_SIZE - 1)) > - goto out; > + return -EINVAL; > if (mem->guest_phys_addr & (PAGE_SIZE - 1)) > - goto out; > + return -EINVAL; > /* We can read the guest memory with __xxx_user() later on. */ > if ((id < KVM_USER_MEM_SLOTS) && > ((mem->userspace_addr & (PAGE_SIZE - 1)) || > !access_ok((void __user *)(unsigned long)mem->userspace_addr, > mem->memory_size))) > - goto out; > + return -EINVAL; > if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_MEM_SLOTS_NUM) > - goto out; > + return -EINVAL; > if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) > - goto out; > + return -EINVAL; > > slot = id_to_memslot(__kvm_memslots(kvm, as_id), id); > base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; > npages = mem->memory_size >> PAGE_SHIFT; > > if (npages > KVM_MEM_MAX_NR_PAGES) > - goto out; > + return -EINVAL; > > new = old = *slot; > > @@ -973,20 +972,18 @@ int __kvm_set_memory_region(struct kvm *kvm, > if ((new.userspace_addr != old.userspace_addr) || > (npages != old.npages) || > ((new.flags ^ old.flags) & KVM_MEM_READONLY)) > - goto out; > + return -EINVAL; > > if (base_gfn != old.base_gfn) > change = KVM_MR_MOVE; > else if (new.flags != old.flags) > change = KVM_MR_FLAGS_ONLY; > - else { /* Nothing to change. */ > - r = 0; > - goto out; > - } > + else /* Nothing to change. */ > + return 0; > } > } else { > if (!old.npages) > - goto out; > + return -EINVAL; > > change = KVM_MR_DELETE; > new.base_gfn = 0; > @@ -995,29 +992,29 @@ int __kvm_set_memory_region(struct kvm *kvm, > > if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) { > /* Check for overlaps */ > - r = -EEXIST; > kvm_for_each_memslot(slot, __kvm_memslots(kvm, as_id)) { > if (slot->id == id) > continue; > if (!((base_gfn + npages <= slot->base_gfn) || > (base_gfn >= slot->base_gfn + slot->npages))) > - goto out; > + return -EEXIST; > } > } > > - r = -ENOMEM; > - > /* Allocate/free page dirty bitmap as needed */ > if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) > new.dirty_bitmap = NULL; > else if (!new.dirty_bitmap) { > - if (kvm_create_dirty_bitmap(&new) < 0) > - goto out; > + r = kvm_create_dirty_bitmap(&new); > + if (r) > + return r; > } > > slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL_ACCOUNT); > - if (!slots) > + if (!slots) { > + r = -ENOMEM; > goto out_bitmap; > + } > memcpy(slots, __kvm_memslots(kvm, as_id), sizeof(struct kvm_memslots)); > > if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) { > @@ -1068,7 +1065,6 @@ int __kvm_set_memory_region(struct kvm *kvm, > out_bitmap: > if (new.dirty_bitmap && !old.dirty_bitmap) > kvm_destroy_dirty_bitmap(&new); > -out: > return r; > } > EXPORT_SYMBOL_GPL(__kvm_set_memory_region); >
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