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[Xen-devel] qemu(-dm): aborting on wrong mmio size?


in the qemu-xen-unstable tree (git://xenbits.xen.org/qemu-xen-unstable.git), the do_inp() function [i386-dm/helper2.c] makes the process exit if the operand size is wrong. Blame: 6040eea5 ("More files imported from xen-unstable 17192:59b8768d0d0d").

In the qemu tree (git://git.qemu.org/qemu.git), the do_inp() function [xen-all.c] does the same (via hw_error() / abort()). Blame: 9ce94e7c ("xen: Initialize event channels and io rings").

Is it justified to kill the emulator when this happens (eg. memory mapped IO with 64-bit operand)? What would happen on real hardware? If it's "undefined", wouldn't it be "better" (for some definition of "better") to return a constant?

Thank you,

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