On Mon, 9 Sep 2019 at 17:56, John Snow <js...@redhat.com> wrote: > On 9/7/19 9:58 AM, Toe Dev wrote: > > 2) My main target is to output a lot of this to console cause I new to qemu > > and I want fast feedback on stuff like this. I try start > > qemu with -D option but the log files never have been written > > by qemu, but either no success. > > > > QEMU doesn't output a lot of information by default, `-D` might be kind > of misleading. (Actually, I've never used it...)
-D just sets the filename for output of -d debug logging. It won't actually log anything there unless you use the -d option to specify what to log. The -d logs are largely useful for doing TCG (emulation) development work; if KVM is what you care about then tracepoints are probably more helpful. (Tracepoints work with TCG as well.) thanks -- PMM
