hw/i386: add 4g boundary start to X86MachineState
Rather than hardcoding the 4G boundary everywhere, introduce a X86MachineState field @above_4g_mem_start and use it accordingly. This is in preparation for relocating ram-above-4g to be dynamically start at 1T on AMD platforms. Signed-off-by: NJoao Martins <joao.m.martins@oracle.com> Reviewed-by: NIgor Mammedov <imammedo@redhat.com> Message-Id: <20220719170014.27028-2-joao.m.martins@oracle.com> Reviewed-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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