tree 402821c7e8ea3a766a4d43750c8cd1d5ccb69c3d
parent 98938aa8edd66dc95024d7c936a4bc315f6615ff
author David Rientjes <rientjes@google.com> 1546462593 -0800
committer Radim Krčmář <rkrcmar@redhat.com> 1547228287 +0100

kvm: sev: Fail KVM_SEV_INIT if already initialized

By code inspection, it was found that multiple calls to KVM_SEV_INIT
could deplete asid bits and overwrite kvm_sev_info's regions_list.

Multiple calls to KVM_SVM_INIT is not likely to occur with QEMU, but this
should likely be fixed anyway.

This code is serialized by kvm->lock.

Fixes: 1654efcbc431 ("KVM: SVM: Add KVM_SEV_INIT command")
Reported-by: Cfir Cohen <cfir@google.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>