IFF_VNET_HDR is a tun/tap flag that allows you to send and receive
large (i.e. GSO) packets and packets with partial checksums. Setting
the flag means that every packet is proceeded by the same header which
virtio uses to communicate GSO/csum metadata.
By enabling this flag on the tap fds we create, we greatly increase
the achievable throughput with virtio_net.
However, we need to be careful to only set the flag when a) QEMU has
support for this ABI and b) the value of the flag is queryable using
the TUNGETIFF ioctl.
It's nearly five months since kvm-74 - the first KVM release with this
feature - was released. Up until now, we've not added libvirt support
because there is no clean way to detect support for this in QEMU at
runtime. A brief attempt to add a "info capabilities" monitor command
to QEMU floundered. Perfect is the enemy of good enough. Probing the
KVM version will suffice for now.
Signed-off-by: Mark McLoughlin <markmc@redhat.com>
qemudCapsInitNUMA and umlCapsInitNUMA were identical, so this change
factors them into a new function, virCapsInitNUMA, and puts it in
nodeinfo.c.
In addition to factoring out the duplicates, this change also
adjusts that function definition (along with its macros) so
that it works with Fedora 9's numactl version 1, and makes it
so the code will work even if someone builds the kernel with
CONFIG_NR_CPUS > 4096.
Finally, also perform this NUMA initialization for the lxc
and openvz drivers.
* src/nodeinfo.c: Include <stdint.h>, <numa.h> and "memory.h".
(virCapsInitNUMA): Rename from qemudCapsInitNUMA and umlCapsInitNUMA.
(NUMA_MAX_N_CPUS): Define depending on NUMA API version.
(n_bits, MASK_CPU_ISSET): Define, adjust, use uint64 rather than long.
* src/nodeinfo.h: Include "capabilities.h".
(virCapsInitNUMA): Declare it.
* examples/domain-events/events-c/Makefile.am:
* src/Makefile.am: Add $(NUMACTL_CFLAGS) and $(NUMACTL_LIBS) to various
compile/link-related variables.
* src/qemu_conf.c: Include "nodeinfo.h".
(qemudCapsInitNUMA): Remove duplicate code. Adjust caller.
* src/uml_conf.c (umlCapsInitNUMA): Likewise.
Include "nodeinfo.h".
* src/lxc_conf.c: Include "nodeinfo.h".
(lxcCapsInit): Perform NUMA initialization here, too.
* src/openvz_conf.c (openvzCapsInit): And here.
Include "nodeinfo.h".
* src/libvirt_sym.version.in: Add virCapsInitNUMA so that libvirtd
can link to this function.
This change is required on some kernels due to the way a change in
the kernel's CONFIG_NR_CPUS propagates through the numa library.
* src/qemu_conf.c (qemudCapsInitNUMA): Pass numa_all_cpus_ptr->size/8
as the buffer-length-in-bytes in the call to numa_node_to_cpus, since
that's what is required on second and subseqent calls.
* src/uml_conf.c (umlCapsInitNUMA): Likewise.
* src/domain_conf.c src/domain_conf.h src/qemu_conf.c
tests/qemuxml2argvtest.c tests/qemuxml2xmltest.c
tests/qemuxml2argvdata/qemuxml2argv-graphics-sdl-fullscreen.args
tests/qemuxml2argvdata/qemuxml2argv-graphics-sdl-fullscreen.xml:
slightly modified patch for SDL fullscreen from Itamar Heim
* docs/formatdomain.html docs/formatdomain.html.in docs/libvirt.rng:
update the schemas and docs about the sdl graphic element attributes
* AUTHORS: add Itamar Heim
Daniel
* src/qemu_conf.c: patch from Cole Robinson to report in the
capabilities only the ones where the emulators is actually found
* po/libvirt.pot: regenerated
* src/libvirt.c: small typo fix
Daniel
* src/qemu_conf.c: fix serial/telnet to use "server" option
rather than "listen"
* tests/qemuxml2argvdata/qemuxml2argv-serial-tcp-telnet.args:
fix the test case too
* src/domain_conf.c src/domain_conf.h src/qemu_conf.c
src/qemu_driver.c: patch from Guido Günther allowing to add
disk as USB devices
* docs/libvirt.rng: extend the schemas for the new value
* tests/qemuxml2argvdata/qemuxml2argv-disk-usb.args
tests/qemuxml2argvdata/qemuxml2argv-disk-usb.xml
tests/qemuxml2argvtest.c tests/qemuxml2xmltest.c: add a specific
test to the regression suite
Daniel
* src/domain_conf.c src/domain_conf.h src/qemu_conf.c
src/qemu_driver.c: Patch from Guido Günther allowing to pass
usb devices to qemu/kvm
* docs/libvirt.rng: add the new functionality to the grammar
* tests/qemuxml2argvdata/qemuxml2argv-hostdev-usb-address.args
tests/qemuxml2argvdata/qemuxml2argv-hostdev-usb-address.xml
tests/qemuxml2argvdata/qemuxml2argv-hostdev-usb-product.args
tests/qemuxml2argvdata/qemuxml2argv-hostdev-usb-product.xml
tests/qemuxml2argvtest.c tests/qemuxml2xmltest.c: adding examples
to the regression tests
* libvirt.spec.in: fix the licence tag
Daniel
handling code. In particular, if you had a section of XML like:
<disk type='file' device='cdrom'>
<target dev='hdc' bus='ide'/>
<readonly/>
</disk>
This used to work with older libvirt, but now fails. This is because we are
actually passing the literal string (null) to the qemu command-line, which qemu
barfs on. This patch fixes it up by making it blank, which allows qemu to
continue on it's merry way.
Signed-off-by: Chris Lalancette <clalance@redhat.com>
introduced into the qemudNetworkIfaceConnect() function. In particular, there
is a call:
if (VIR_ALLOC_N(vm->tapfds, vm->ntapfds+2) < 0)
goto no_memory;
However, the tapfds structure is used to track *all* of the tap fds, and is
called once for each network that is being attached to the domain. VIR_ALLOC_N
maps to calloc(). So the first network would work just fine, but if you had
more than one network, subsequent calls to this function would blow away the
stored fd's that were already there and fill them all in with zeros. This
causes multiple problems, from the qemu domains not starting properly to
improper cleanup on shutdown. The attached patch just changes the VIR_ALLOC_N()
to a VIR_REALLOC_N(), and everything is happy again.
Signed-off-by: Chris Lalancette <clalance@redhat.com>
