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xen-devel
[Xen-devel] Re: [Xen-staging] [xen-unstable] hvm: Remove access to QEMU
Christian Limpach wrote:
QEMU 0.9.0 supports redirecting the monitor to a unix socket and
supports reconnecting to the monitor (so that the banner is
shown each
time).
When using these options, you can actually execute monitor
commands from
the command line by doing something like:
echo help | socat stdin unix:/path/to/socket
With these patches (or by moving qemu-dm up to 0.9.0),
someone could add
an xm monitor command that let you execute commands via xm.
That, IMHO, would be the best possible solution.
I've found that redirecting the monitor using "-monitor pty" works quite
well since you get access to it using xm console. That might have been
broken recently though by the changes to how pty information is written
to xenstore.
Except if you disconnect from the pty, QEMU is prone to ending up in an
infinite loop of read() == 0.
I think it would be better to extend xm console to support additional
pty's instead of adding a single purpose xm monitor command.
xm console could also be extended to work with domain sockets which do
not suffer from this problem.
Regards,
Anthony Liguori
christian
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