KVM: nVMX: propagate errors from prepare_vmcs02

KVM: nVMX: propagate errors from prepare_vmcs02

It is possible that prepare_vmcs02 fails to load the guest state. This
patch adds the proper error handling for such a case. L1 will receive
an INVALID_STATE vmexit with the appropriate exit qualification if it
happens.

A failure to set guest CR3 is the only error propagated from prepare_vmcs02
at the moment.

Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
(cherry picked from commit ee146c1c100dbe9ca92252be2e901b957476b253)
OraBug: 26628813 KVM: nVMX: fix CR3 load if L2 uses PAE paging and EPT - backport+regression fix
Signed-off-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Reviewed-by: Jack Vogel <jack.vogel@oracle.com>
Tested-by: Eyal Moscovici <eyal.moscovici@oracle.com>
Tested-by: Chris Kenna <chris.kenna@oracle.com>
Acked-by: Konrad Wilk <konrad.wilk@oracle.com>