Hello,
Sorry if this is the wrong list to post this question.
I am working on some application that use the Xen low level interfaces.
Commonly, I'm seeing this:
==7203==
==7203== Warning: noted but unhandled ioctl 0x305000 with no
size/direction hints
==7203== This could cause spurious value errors to appear.
==7203== See README_MISSING_SYSCALL_OR_IOCTL for guidance on writing
a proper wrapper.
I've examined the docs/html/dist.readme-missing.html and adding hints
for xen hypercalls and other ioctls (for Xen privcmd) seems very
straight forward, at least for Linux.
I have several questions before I begin:
1 - Is syswrap-generic.c (in PRE(sys_ioctl) and POST(sys_ioctl)
respectively) the right place for these? That's where _NR_ioctl is
handled for everything from what I can see. If they should be broken out
into another module, I'll need some guidance :)
2 - I should VKI namespaceize the few constants and structures needed
and add them in include/vki/vki-{arch}.h? I noted the presence of
_VKI_IOC() in both x86 and amd64. Since these aren't coming out of
linux, would it be appropriate to put them in vki-virt-{arch}.h and
include them in vki-{arch}.h ?
3 - Is there any reason why these were not added as of yet, i.e. was the
issue of Xen being a moving target a problem? While Xen may add more
ioctls in the future, the existing will not change.
4 - Where should I post a RFC for the patch prior to creating a bug and
attaching it, or should I just upload it?
It seemed almost too easy, so I want to be sure I'm not missing
something.
Thanks for making and maintaining such a very useful tool!
--Tim
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