Commit fe182af7 authored by David Rientjes's avatar David Rientjes Committed by Greg Kroah-Hartman

kvm: sev: Fail KVM_SEV_INIT if already initialized

[ Upstream commit 3f14a89d ]

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: 1654efcb ("KVM: SVM: Add KVM_SEV_INIT command")
Reported-by: default avatarCfir Cohen <cfir@google.com>
Signed-off-by: default avatarDavid Rientjes <rientjes@google.com>
Signed-off-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 5443a097
......@@ -6255,6 +6255,9 @@ static int sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp)
int asid, ret;
ret = -EBUSY;
if (unlikely(sev->active))
return ret;
asid = sev_asid_new();
if (asid < 0)
return ret;
......
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