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KVM: mark memory slots as rcu

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we access the memslots array via srcu. Mark it as such and
use the right access functions also for the freeing of
memory slots.

Found by sparse:
./include/linux/kvm_host.h:565:16: error: incompatible types in
comparison expression (different address spaces)

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Christian Borntraeger 2017-07-06 16:17:14 +02:00
parent 4a12f95177
commit a80cf7b5f4
2 changed files with 5 additions and 3 deletions
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2
include/linux/kvm_host.h
View file

@ -390,7 +390,7 @@ struct kvm {
spinlock_t mmu_lock;
struct mutex slots_lock;
struct mm_struct *mm; /* userspace tied to this vm */
struct kvm_memslots *memslots[KVM_ADDRESS_SPACE_NUM];
struct kvm_memslots __rcu *memslots[KVM_ADDRESS_SPACE_NUM];
struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
/*

6
virt/kvm/kvm_main.c
View file

@ -707,7 +707,8 @@ out_err_no_disable:
for (i = 0; i < KVM_NR_BUSES; i++)
kfree(rcu_access_pointer(kvm->buses[i]));
for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
kvm_free_memslots(kvm, kvm->memslots[i]);
kvm_free_memslots(kvm,
rcu_dereference_protected(kvm->memslots[i], 1));
kvm_arch_free_vm(kvm);
mmdrop(current->mm);
return ERR_PTR(r);
@ -756,7 +757,8 @@ static void kvm_destroy_vm(struct kvm *kvm)
kvm_arch_destroy_vm(kvm);
kvm_destroy_devices(kvm);
for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
kvm_free_memslots(kvm, kvm->memslots[i]);
kvm_free_memslots(kvm,
rcu_dereference_protected(kvm->memslots[i], 1));
cleanup_srcu_struct(&kvm->irq_srcu);
cleanup_srcu_struct(&kvm->srcu);
kvm_arch_free_vm(kvm);