KVM: unbreak userspace that does not sets tss address
Commit 6440e5967bc broke old userspaces that do not set tss address before entering vcpu. Unbreak it by setting tss address to a safe value on the first vcpu entry. New userspaces should set tss address, so print warning in case it doesn't. Signed-off-by: NGleb Natapov <gleb@redhat.com> Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
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