On Wednesday, September 5, 2018 at 4:26:11 AM UTC+2, Marcus Linsner wrote:
> Regarding OP, maybe I should look into this:
> https://www.kernel.org/doc/Documentation/filesystems/caching/fscache.txt
> I'm unsure if it'll work for what I want, yet.
>
> On Tuesday, August 28, 2018 at 10:35:23 PM UTC+2, Marcus Linsner wrote:
> > Side question: how can I send eg. sysrq+m to a qube? (seems not possible
> > according to this 2016 post https://phabricator.whonix.org/T553#10438 ? )
>
> Looks like it's possible, from dom0:
>
> $ xl sysrq
> 'xl sysrq' requires at least 2 arguments.
>
> Usage: xl [-vf] sysrq
>
> Send a sysrq to a domain.
>
>
> Or, maybe not:
> [ 61.904917] xen:manage: sysrq_handler: Error -13 writing sysrq in
> control/sysrq
>
> I tried on a disposable VM, 's' and 'h'.
> $ sysctl kernel.sysrq
> already reports =1
>
> On first glance I found the code responsible here:
> https://lists.xenproject.org/archives/html/xen-devel/2018-06/msg01068.html
> if (sysrq_key != '\0') {
> err = xenbus_printf(xbt, "control", "sysrq", "%c", '\0');
> ...
> I'm not sure if that looks right, I mean why isn't sysrq_key written instead
> of just a '\0' ? perhaps I'm misreading this. I'm not a programmer :D
Ah sweet! There's a fix:
https://xenbits.xen.org/gitweb/?p=xen.git;a=commitdiff;h=30a970906038a4d360e1f7ee29ba80ef832dd78b;hp=6de6c8d306c091eb7381575d250beaf2eeaf02df
I can't wait to test it whenever I figure out how to :D (possibly using
qubes-builder to compile xen, ...)
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