On 16/12/2015 18:56, Daniel P. Berrange wrote: > Introduce a new QEMU chardev backend called "overlay" which > allows you to splice together a pair of chardev backends into > one combined backend. The master backend permits full input/output > but the slave backend is output only. > > The primary use case for this is to allow arbitrary backends to > have their data logged to a file, eg a 'file' backend would be > setup as the slave. > > $ qemu-system-x86_64 \ > -chardev socket,host=localhost,port=9000,server=on,nowait,id=char0master > \ > -chardev file,path=/some/log/file.log,id=char0slave \ > -chardev overlay,id=char0,master=char0master,slave=char0slave \ > -device isa-serial,chardev=char0 \ > ...other args... > --- > > This idea was suggsted in > > https://lists.gnu.org/archive/html/qemu-devel/2015-12/msg01256.html > > this patch is a very quick proof of concept impl to illustrate the > idea.
Hmm, I was a fan of the "do it outside QEMU" idea... It would also fix the issue you have with qemu_chr_fe_write_all... Paolo
