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Without this gdb does not report an error. With this patch and using a 1G hvm domU: (gdb) x/1xh 0x6ae9168b 0x6ae9168b: Cannot access memory at address 0x6ae9168b Drop output of iop->remain because it most likely will be zero. This leads to a strange message: ERROR: failed to read 0 bytes. errno:14 rc:-1 Add address to write error because it may be the only message displayed. Note: currently XEN_DOMCTL_gdbsx_guestmemio does not change 'iop' on error and so iop->remain will be zero. Signed-off-by: Don Slutz <dslutz@verizon.com> Acked-by: Mukesh Rathor <mukesh.rathor@oracle.com>