Hi As requested by Dave, I send this to the list.
I came across a bug that the command line generated for passtrough of the host parallel port /dev/parport0 by libvirt for QEMU is incorrect. It currently produces: -chardev tty,id=charparallel0,path=/dev/parport0 -device isa-parallel,chardev=charparallel0,id=parallel0 The first parameter is "tty". It sould be "parport". If I launch qemu with -chardev parport,... it works as expected. I have already filled a bug report ( https://bugzilla.redhat.com/show_bug.cgi?id=823879 ), the topic was already on the list some months ago: https://www.redhat.com/archives/libvirt-users/2011-September/msg00095.html Not sure if this is fix is very clean, but for my case it works. Perhaps it should also be checked if similar problems / patches are required for other chardev backends. Kind regards Beat diff -Naur libvirt-0.9.4.orig/src/qemu/qemu_command.c libvirt-0.9.4/src/qemu/qemu_command.c --- libvirt-0.9.4.orig/src/qemu/qemu_command.c 2012-05-22 13:40:16.788633656 +0200 +++ libvirt-0.9.4/src/qemu/qemu_command.c 2012-05-22 13:52:18.453608557 +0200 @@ -2357,8 +2357,14 @@ break; case VIR_DOMAIN_CHR_TYPE_DEV: - virBufferAsprintf(&buf, "tty,id=char%s,path=%s", alias, - dev->data.file.path); + if (STRPREFIX(dev->data.file.path, "/dev/parport")) { + virBufferAsprintf(&buf, "parport,id=char%s,path=%s", alias, + dev->data.file.path); + } + else { + virBufferAsprintf(&buf, "tty,id=char%s,path=%s", alias, + dev->data.file.path); + } break; case VIR_DOMAIN_CHR_TYPE_FILE:
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