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We are going to need to make an hypercall in order to retreive the E820 table from the hypervisor before been able to setup the memory. Calling XenConnect earlier will allow to setup the XenHypercallLib earlier to allow to make hypercalls. While here, add some comments in XenConnect(). Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1689 Signed-off-by: Anthony PERARD <anthony.perard@citrix.com> Acked-by: Laszlo Ersek <lersek@redhat.com> Message-Id: <20190813113119.14804-20-anthony.perard@citrix.com>