Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

There's no need to do lots of readlink() calls to canonicalize
a name if we're only going to use stat() on it, since stat()
already chases symlinks.

* src/util/virutil.c (virGetDeviceID): Let stat() do the symlink
chasing.

Pass stub driver name directly to pciDettachDevice and pciReAttachDevice to fit
for different libvirt drivers. For example, qemu driver prefers pci-stub, but
Xen prefers pciback.
Signed-off-by: NChunyan Liu <cyliu@suse.com>

Added 'usbFreeDevice' to the useless_free_options list in cfg.mk

Add some APIs for acquiring namespace file descriptors and
switching namespaces
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

This ignores the default "filtered" if unpriv_sgio is not supported
by kernel, but for explicit request "filtered", it error out for
domain starting.

"virGetDeviceID" could be used across the sources, but it doesn't
relate with this series, and could be done later.

* src/util/virutil.h: (Declare virGetDeviceID, and
                       vir{Get,Set}DeviceUnprivSGIO)
* src/util/virutil.c: (Implement virGetDeviceID and
                       vir{Get,Set}DeviceUnprivSGIO)
* src/libvirt_private.syms: Export private symbols of upper helpers

This is an adjustment to the fix for

  https://bugzilla.redhat.com/show_bug.cgi?id=889319

to account for two bonehead mistakes I made.

commit ac2797cf attempted to fix a
problem with netlink in newer kernels requiring an extra attribute
with a filter flag set in order to receive an IFLA_VFINFO_LIST from
netlink. Unfortunately, the #ifdef that protected against compiling it
in on systems without the new flag went a bit too far, assuring that
the new code would *never* be compiled, and even if it had, the code
was incorrect.

The first problem was that, while some IFLA_* enum values are also
their existence at compile time, IFLA_EXT_MASK *isn't* #defined, so
checking to see if it's #defined is not a valid method of determining
whether or not to add the attribute. Fortunately, the flag that is
being set (RTEXT_FILTER_VF) *is* #defined, and it is never present if
IFLA_EXT_MASK isn't, so it's sufficient to just check for that flag.

And to top it off, due to the code not actually compiling when I
thought it did, I didn't realize that I'd been given the wrong arglist
to nla_put() - you can't just send a const value to nla_put, you have
to send it a pointer to memory containing what you want to add to the
message, along with the length of that memory.

This time I've actually sent the patch over to the other machine
that's experiencing the problem, applied it to the branch being used
(0.10.2) and verified that it works properly, i.e. it does fix the
problem it's supposed to fix. :-/

Since the event APIs are now in the public header, no internal
code should include virevent.h

Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

To bring in line with new naming practice, rename the=
src/util/cgroup.{h,c} files to vircgroup.{h,c}
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

This patch resolves:

  https://bugzilla.redhat.com/show_bug.cgi?id=889319

When assigning an SRIOV virtual function to a guest using "intelligent
PCI passthrough" (<interface type='hostdev'>, which sets the MAC
address and vlan tag of the VF before passing its info to qemu),
libvirt first learns the current MAC address and vlan tag by sending
an NLM_F_REQUEST message for the VF's PF (physical function) to the
kernel via a NETLINK_ROUTE socket (see virNetDevLinkDump()); the
response message's IFLA_VFINFO_LIST section is examined to extract the
info for the particular VF being assigned.

This worked fine with kernels up until kernel commit
115c9b81928360d769a76c632bae62d15206a94a (first appearing in upstream
kernel 3.3) which changed the ABI to not return IFLA_VFINFO_LIST in
the response until a newly introduced IFLA_EXT_MASK field was included
in the request, with the (newly introduced, of course) RTEXT_FILTER_VF
flag set.

The justification for this ABI change was that new fields had been
added to the VFINFO, causing NLM_F_REQUEST messages to fail on systems
with large numbers of VFs if the requesting application didn't have a
large enough buffer for all the info. The idea is that most
applications doing an NLM_F_REQUEST don't care about VFINFO anyway, so
eliminating it from the response would lower the requirements on
buffer size. Apparently, the people who pushed this patch made the
mistaken assumption that iproute2 (the "ip" command) was the only
package that used IFLA_VFINFO_LIST, so it wouldn't break anything else
(and they made sure that iproute2 was fixed.

The logic of this "fix" is debatable at best (one could claim that the
proper fix would be for the applications in question to be fixed so
that they properly sized the buffer, which is what libvirt does
(purely by virtue of using libnl), but it is what it is and we have to
deal with it.

In order for <interface type='hostdev'> to work properly on systems
with a kernel 3.3 or later, libvirt needs to add the afore-mentioned
IFLA_EXT_MASK field with RTEXT_FILTER_VF set.

Of course we also need to continue working on systems with older
kernels, so that one bit of code is compiled conditionally. The one
time this could cause problems is if the libvirt binary was built on a
system without IFLA_EXT_MASK which was subsequently updated to a
kernel that *did* have it. That could be solved by manually providing
the values of IFLA_EXT_MASK and RTEXT_FILTER_VF and adding it to the
message anyway, but I'm uncertain what that might actually do on a
system that didn't support the message, so for the time being we'll
just fail in that case (which will very likely never happen anyway).