Messages in this thread | | | From | Rusty Russell <> | Subject | Re: [PATCH] x86: fix pte_flags() to only return flags, fix lguest (updated) | Date | Fri, 25 Jul 2008 11:55:49 +1000 |
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On Thursday 24 July 2008 21:31:22 Ingo Molnar wrote: > * Rusty Russell <rusty@rustcorp.com.au> wrote: > > On Tuesday 22 July 2008 19:04:32 Ingo Molnar wrote: > > > i'm wondering. My randconfig tests boot up an lguest enabled kernel > > > every 30 minutes or so: > > > > > > config-Mon_Jul_21_19_05_54_CEST_2008.good:CONFIG_LGUEST=y > > > config-Mon_Jul_21_19_43_13_CEST_2008.good:CONFIG_LGUEST=y > > > config-Mon_Jul_21_19_47_40_CEST_2008.good:CONFIG_LGUEST=y > > > config-Mon_Jul_21_20_37_41_CEST_2008.good:CONFIG_LGUEST=y > > > config-Mon_Jul_21_22_11_42_CEST_2008.good:CONFIG_LGUEST=y > > > config-Mon_Jul_21_22_16_59_CEST_2008.good:CONFIG_LGUEST=y > > > config-Mon_Jul_21_22_32_22_CEST_2008.good:CONFIG_LGUEST=y > > > config-Mon_Jul_21_23_25_55_CEST_2008.good:CONFIG_LGUEST=y > > > config-Mon_Jul_21_23_51_29_CEST_2008.good:CONFIG_LGUEST=y > > > > > > Would it be possible to have some really stupid lguest self-test which > > > would complain spectacularly in the host kernel if it fails to reach > > > some minimal user-space? > > > > > > Something that could be self-contained within a single bzImage. (i.e. > > > it would contain a minimalistic image of some sort with a very > > > minimalistic userspace component as well - or something like that) > > > > Well, adding "make -C Documentation/lguest" to the build is a good start > > (this finds those "e820.h not longer includable from userspace" bugs). > > > > Secondly, if you put the resulting Documentation/lguest/lguest somewhere > > on your booting test machine, it can just do something like > > > > ./lguest 64 /boot/vmlinuz-`uname -r` | grep 'VFS: Unable to mount root' > > stupid question: what's the easiest way to filter out the case where > there's not sufficient kernel support in the bzImage to actually run > lguest? > > I.e. if i extend the "is this bzImage working fine" check with the above > lguest bootup test - with the expectation of it getting down to the > "VFS: Unable to mount root" message [success case], how do i filter out > the case where it doesnt get to that message not due to some lguest > breakage, but because there's not enough lguest support there.
Easiest to check config: CONFIG_LGUEST and CONFIG_LGUEST_GUEST.
Well, there may be no host-for-lguest support, modular or builtin. "modprobe lg" to be sure, then if lguest says: "lguest: Failed to open /dev/lguest: No such file or directory" your host doesn't support it.
If there's no guest support, it's trickier. The boot will fail in some non-obvious way depending on config options....
> > I can create one (and test the example) for you if you're interested? > > that would be great ...
OK, added to TODO.
Rusty.
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