Merge tag 'kvm-s390-master-4.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into kvm-master

KVM: s390: Fixes for 4.4

1. disallow changing the SIMD mode when CPUs have been created.
   it allowed userspace to corrupt kernel memory
2. Fix vCPU lookup. Until now the vCPU number equals the vCPU id. Some
   kernel code places relied on that. This might
   a: cause guest failures
   b: allow userspace to corrupt kernel memory
3. Fencing of the PFMF instruction should use the guest facilities
   and not the host facilities.

1 files changed, 11 insertions, 0 deletions

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 5706a2108f0a..c923350ca20a 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -460,6 +460,17 @@ static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i)
              (vcpup = kvm_get_vcpu(kvm, idx)) != NULL; \
              idx++)
 
+static inline struct kvm_vcpu *kvm_get_vcpu_by_id(struct kvm *kvm, int id)
+{
+        struct kvm_vcpu *vcpu;
+        int i;
+
+        kvm_for_each_vcpu(i, vcpu, kvm)
+                if (vcpu->vcpu_id == id)
+                        return vcpu;
+        return NULL;
+}
+
 #define kvm_for_each_memslot(memslot, slots)    \
         for (memslot = &slots->memslots[0];     \
               memslot < slots->memslots + KVM_MEM_SLOTS_NUM && memslot->npages;\