[PATCH 26/45] KVM: s390: Invoke kvm_vcpu_init() before allocating sie_page

Sean Christopherson
2019-10-22T01:59:06Z

Now that s390's implementation of kvm_arch_vcpu_init() is empty, move
the call to kvm_vcpu_init() above the allocation of the sie_page. This
paves the way for moving vcpu allocation and initialization into common
KVM code without any associated functional change.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
arch/s390/kvm/kvm-s390.c | 18 ++++++++++--------
1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 43be136682bb..9289ed10561b 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -3030,10 +3030,16 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
if (!vcpu)
goto out;

+ rc = kvm_vcpu_init(vcpu, kvm, id);
+ if (rc)
+ goto out_free_cpu;
+
+ rc = -ENOMEM;
+
BUILD_BUG_ON(sizeof(struct sie_page) != 4096);
sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL);
if (!sie_page)
- goto out_free_cpu;
+ goto out_uninit_vcpu;

vcpu->arch.sie_block = &sie_page->sie_block;
vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb;
@@ -3049,10 +3055,6 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
vcpu->arch.sie_block->gd |= GISA_FORMAT1;
seqcount_init(&vcpu->arch.cputm_seqcount);

- rc = kvm_vcpu_init(vcpu, kvm, id);
- if (rc)
- goto out_free_sie_block;
-
vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
kvm_clear_async_pf_completion_queue(vcpu);
vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX |
@@ -3081,7 +3083,7 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
if (kvm_is_ucontrol(vcpu->kvm)) {
rc = __kvm_ucontrol_vcpu_init(vcpu);
if (rc)
- goto out_uninit_vcpu;
+ goto out_free_sie_block;
}

VM_EVENT(kvm, 3, "create cpu %d at 0x%pK, sie block at 0x%pK", id, vcpu,
@@ -3089,10 +3091,10 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block);

return vcpu;
-out_uninit_vcpu:
- kvm_vcpu_uninit(vcpu);
out_free_sie_block:
free_page((unsigned long)(vcpu->arch.sie_block));
+out_uninit_vcpu:
+ kvm_vcpu_uninit(vcpu);
out_free_cpu:
kmem_cache_free(kvm_vcpu_cache, vcpu);
out:
--
2.22.0