Next patch will validate QEMU_CAPS_NUMA_DIST in a new qemu_domain.c
function. The code to verify if a NUMA node distance is being
set will still be needed in qemuBuildNumaArgStr() though.

To avoid code repetition, let's put this logic in a helper to be
used in qemuBuildNumaArgStr() and in the new function.
Reviewed-by: NCole Robinson <crobinso@redhat.com>
Signed-off-by: NDaniel Henrique Barboza <danielhb413@gmail.com>

Signed-off-by: NDaniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Standardize on putting the _LAST enum value on the second line
of VIR_ENUM_IMPL invocations. Later patches that add string labels
to VIR_ENUM_IMPL will push most of these to the second line anyways,
so this saves some noise.
Signed-off-by: NCole Robinson <crobinso@redhat.com>

Missing semicolon at the end of macros can confuse some analyzers
(like cppcheck <filename>), and we have a mix of semicolon and
non-semicolon usage through the code. Let's standardize on using
a semicolon for VIR_ENUM_IMPL calls.

Move the verify() statement to the end of the macro and drop
the semicolon, so the compiler will require callers to add a
semicolon.

While we are touching these call sites, standardize on putting
the closing parenth on its own line, as discussed here:
https://www.redhat.com/archives/libvir-list/2019-January/msg00750.htmlReviewed-by: NJohn Ferlan <jferlan@redhat.com>
Signed-off-by: NCole Robinson <crobinso@redhat.com>

In many files there are header comments that contain an Author:
statement, supposedly reflecting who originally wrote the code.
In a large collaborative project like libvirt, any non-trivial
file will have been modified by a large number of different
contributors. IOW, the Author: comments are quickly out of date,
omitting people who have made significant contribitions.

In some places Author: lines have been added despite the person
merely being responsible for creating the file by moving existing
code out of another file. IOW, the Author: lines give an incorrect
record of authorship.

With this all in mind, the comments are useless as a means to identify
who to talk to about code in a particular file. Contributors will always
be better off using 'git log' and 'git blame' if they need to  find the
author of a particular bit of code.

This commit thus deletes all Author: comments from the source and adds
a rule to prevent them reappearing.

The Copyright headers are similarly misleading and inaccurate, however,
we cannot delete these as they have legal meaning, despite being largely
inaccurate. In addition only the copyright holder is permitted to change
their respective copyright statement.
Reviewed-by: NErik Skultety <eskultet@redhat.com>
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>

QEMU has possibility to call madvise(.., MADV_REMOVE) in some
cases. Expose this feature to users by new element/attribute
discard.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

NUMA distances are part of guest ABI (guests can read it
directly!) and therefore as such shouldn't change throughout the
lifetime of domain.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

Commit id '74119a03' neglected to clean up @distances when
the numa definition is cleaned up.

Don't use a unary comparison for an int value - compare against zero
directly instead.

Clean up the style a bit w/r/t to not using a unary operator on an
integer value that could be zero - compare vs. zero instead.

Set the def->mem_nodes[*].distances to rdist or ldist inside the
if condition - no need to set outside since the value being set
to is what was fetched.

During cleanup, be sure to initialize the ndistances on error and
use the < 0 comparison not the unary one.

The function returns true/false depending on distance
configuration being present in the domain XML.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

There's no point in checking if numa->mem_nodes[node].ndistances
is set if we check for numa->mem_nodes[node].distances. However,
it makes sense to check if the sibling node (@cellid) caller
passed falls within boundaries.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

This patch converts NUMA configurations between the Xen libxl
configuration file format and libvirt's XML format.

XML HVM domain on a 4 node (2 cores/socket) configuration:

  <cpu>
    <numa>
      <cell id='0' cpus='0-1' memory='2097152' unit='KiB'>
        <distances>
          <sibling id='0' value='10'/>
          <sibling id='1' value='21'/>
          <sibling id='2' value='31'/>
          <sibling id='3' value='21'/>
        </distances>
      </cell>
      <cell id='1' cpus='2-3' memory='2097152' unit='KiB'>
        <distances>
          <sibling id='0' value='21'/>
          <sibling id='1' value='10'/>
          <sibling id='2' value='21'/>
          <sibling id='3' value='31'/>
        </distances>
      </cell>
      <cell id='2' cpus='3-4' memory='2097152' unit='KiB'>
        <distances>
          <sibling id='0' value='31'/>
          <sibling id='1' value='21'/>
          <sibling id='2' value='10'/>
          <sibling id='3' value='21'/>
        </distances>
      </cell>
      <cell id='3' cpus='5-6' memory='2097152' unit='KiB'>
        <distances>
          <sibling id='0' value='21'/>
          <sibling id='1' value='31'/>
          <sibling id='2' value='21'/>
          <sibling id='3' value='10'/>
        </distances>
      </cell>
    </numa>
  </cpu>

Xen xl.cfg domain configuration:

  vnuma = [["pnode=0","size=2048","vcpus=0-1","vdistances=10,21,31,21"],
           ["pnode=1","size=2048","vcpus=2-3","vdistances=21,10,21,31"],
           ["pnode=2","size=2048","vcpus=4-5","vdistances=31,21,10,21"],
           ["pnode=3","size=2048","vcpus=6-7","vdistances=21,31,21,10"]]

If there is no XML <distances> description amongst the <cell> data the
conversion schema from xml to native will generate 10 for local and 20
for all remote instances.
Signed-off-by: NWim ten Have <wim.ten.have@oracle.com>
Reviewed-by: NJim Fehlig <jfehlig@suse.com>
Signed-off-by: NJim Fehlig <jfehlig@suse.com>

Add support for describing NUMA distances in a domain's <numa> <cell>
XML description.

Below is an example of a 4 node setup:

  <cpu>
    <numa>
      <cell id='0' cpus='0-3' memory='2097152' unit='KiB'>
        <distances>
          <sibling id='0' value='10'/>
          <sibling id='1' value='21'/>
          <sibling id='2' value='31'/>
          <sibling id='3' value='21'/>
        </distances>
      </cell>
      <cell id='1' cpus='4-7' memory='2097152' unit='KiB'>
        <distances>
          <sibling id='0' value='21'/>
          <sibling id='1' value='10'/>
          <sibling id='2' value='21'/>
          <sibling id='3' value='31'/>
        </distances>
      </cell>
      <cell id='2' cpus='8-11' memory='2097152' unit='KiB'>
        <distances>
          <sibling id='0' value='31'/>
          <sibling id='1' value='21'/>
          <sibling id='2' value='10'/>
          <sibling id='3' value='21'/>
        </distances>
      <cell id='3' cpus='12-15' memory='2097152' unit='KiB'>
        <distances>
          <sibling id='0' value='21'/>
          <sibling id='1' value='31'/>
          <sibling id='2' value='21'/>
          <sibling id='3' value='10'/>
        </distances>
      </cell>
    </numa>
  </cpu>

A <cell> defines a NUMA node. <distances> describes the NUMA distance
from the <cell> to the other NUMA nodes (the <sibling>s).  For example,
in above XML description, the distance between NUMA node0 <cell id='0'
...> and NUMA node2 <sibling id='2' ...> is 31.

Valid distance values are '10 <= value <= 255'.  A distance value of 10
represents the distance to the node itself.  A distance value of 20
represents the default value for remote nodes but other values are
possible depending on the physical topology of the system.

When distances are not fully described, any missing sibling distance
values will default to 10 for local nodes and 20 for remote nodes.

If distance is given for A -> B, then we default B -> A to the same
value instead of 20.
Signed-off-by: NWim ten Have <wim.ten.have@oracle.com>
Reviewed-by: NDaniel P. Berrange <berrange@redhat.com>
Signed-off-by: NJim Fehlig <jfehlig@suse.com>

Rename virDomainNumaDefCPUFormat to virDomainNumaDefCPUFormatXML,
matching its peer virDomainNumaDefCPUParseXML and the general
vir*{Format,Parse}XML conventions.
Signed-off-by: NWim ten Have <wim.ten.have@oracle.com>
Reviewed-by: NJim Fehlig <jfehlig@suse.com>

Rename to avoid duplicate code. Because virDomainMemoryAccess will be
used in memorybacking for setting default behaviour.

NOTE: The enum cannot be moved to qemu/domain_conf because of headers
dependency

Most the callers pass 0 in one form or another, including
vircapstest which used VIR_ARCH_NONE.

While trying to build with -Os I've encountered some build
failures.

util/vircommand.c: In function 'virCommandAddEnvFormat':
util/vircommand.c:1257:1: error: inlining failed in call to 'virCommandAddEnv': call is unlikely and code size would grow [-Werror=inline]
 virCommandAddEnv(virCommandPtr cmd, char *env)
 ^
util/vircommand.c:1308:5: error: called from here [-Werror=inline]
     virCommandAddEnv(cmd, env);
     ^
This function is big enough for the compiler to be not inlined.
This is the error message I'm seeing:

Then virDomainNumatuneNodeSpecified is exported and called from
other places. It shouldn't be inlined then.

In file included from network/bridge_driver_platform.h:30:0,
                 from network/bridge_driver_platform.c:26:
network/bridge_driver_linux.c: In function 'networkRemoveRoutingFirewallRules':
./conf/network_conf.h:350:1: error: inlining failed in call to 'virNetworkDefForwardIf.constprop': call is unlikely and code size would grow [-Werror=inline]
 virNetworkDefForwardIf(const virNetworkDef *def, size_t n)
 ^
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

https://bugzilla.redhat.com/show_bug.cgi?id=1260846

Introduced by 8fedbbdb, if we parse an unordered NUMA cell, will
get a segfault. This is because of a check for overlapping @cpus
sets we have there. However, since the array to hold guest NUMA
cells is allocated upfront and therefore it contains all zeros,
an out of order cell will break our assumption that cell IDs have
increasing character. At this point we try to access yet NULL
bitmap and therefore segfault.
Signed-off-by: NLuyao Huang <lhuang@redhat.com>

This function should return the greatest CPU number set in
/domain/cpu/numa/cell/@cpus. The idea is that we should compare
the returned value against /domain/vcpu value. Yes, there exist
users who think the following is a good idea:

  <vcpu placement='static'>4</vcpu>
  <cpu mode='host-model'>
    <model fallback='allow'/>
    <numa>
      <cell id='0' cpus='0-1' memory='1048576' unit='KiB'/>
      <cell id='1' cpus='9-10' memory='2097152' unit='KiB'/>
    </numa>
  </cpu>
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

So far, we are not reporting if numatune was even defined. The
value of zero is blindly returned (which maps onto
VIR_DOMAIN_NUMATUNE_MEM_STRICT). Unfortunately, we are making
decisions based on this value. Instead, we should not only return
the correct value, but report to the caller if the value is valid
at all.

For better viewing of this patch use '-w'.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

https://bugzilla.redhat.com/show_bug.cgi?id=1176020

We had a check for the vcpu count total number in <numa>
before, however this check is not good enough. There are
some examples:

1. one of cpu id is out of maxvcpus, can set success(cpu count = 5 < 10):

<vcpu placement='static'>10</vcpu>
<cell id='0' cpus='0-3,100' memory='512000' unit='KiB'/>

2. use the same cpu in 2 cell, can set success(cpu count = 8 < 10):
<vcpu placement='static'>10</vcpu>
<cell id='0' cpus='0-3' memory='512000' unit='KiB'/>
<cell id='1' cpus='0-3' memory='512000' unit='KiB'/>

3. use the same cpu in 2 cell, cannot set success(cpu count = 11 > 10):
<vcpu placement='static'>10</vcpu>
<cell id='0' cpus='0-6' memory='512000' unit='KiB'/>
<cell id='1' cpus='0-3' memory='512000' unit='KiB'/>

Add a check for numa cpus, check if duplicate use one cpu in more
than one cell.
Signed-off-by: NLuyao Huang <lhuang@redhat.com>
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

This patch adds checks for empty bitmaps right after the calls of
virBitmapParse. These only include spots where set API's are called and
where domain's XML is parsed.
Also, it partially reverts commit 983f5a which added a check for
invalid nodeset "0,^0" into virBitmapParse function. This change broke
the logic, as an empty bitmap should not cause an error.

https://bugzilla.redhat.com/show_bug.cgi?id=1210545

Commit 5bba61fd changed the XPath strings to be absolute when parsing
the VM NUMA configuration. Unfortunately the <domain> element is not a
top level element when parsing the domain status XML thus the absolute
XPath string doesn't match.

Use the relative string so that the <numa> settings are not lost.
Signed-off-by: NLuyao Huang <lhuang@redhat.com>

The total NUMA memory consists of the sum of individual NUMA node memory
amounts.

Add helper to compare initial sizes of indivitual NUMA nodes and the map
of belonging vCPUs. Other configuration is not ABI.

For historical reasons data regarding NUMA configuration were split
between the CPU definition and numatune. We cannot do anything about the
XML still being split, but we certainly can at least store the relevant
data in one place.

This patch moves the NUMA stuff to the right place.

Add the helpers and refactor places where the value is accessed without
them.

Add virDomainNumaGetNodeCpumask() and refactor a few places that would
get the cpu mask without the helper.

Add an accessor so that a later refactor is simpler.

virDomainNumatuneParseXML now doesn't allocate the def->numa object any
longer so we don't need to pass a double pointer.

As virDomainNumatuneSet now doesn't allocate the virDomainNuma object
any longer it's not necessary to pass the pointer to a pointer to store
the object as it will not change any longer.

While touching the parameter definitions I've also changed the name of
the parameter to "numa".

Since our formatter now handles well if the config is allocated and not
filled we can safely always-allocate the NUMA config and remove the
ad-hoc allocation code.

This will help in later patches as the parser will be refactored to just
fill the data.

Do a content-aware check if formatting of the <numatune> element is
necessary. Later on the def->numa structure will be always present so we
cannot decide only on the basis whether it's allocated.

Shuffling around the logic will allow to simplify the code quite a bit.
As an additional bonus the change in the logic now reports an error if
automatic placement is selected and individual placement is configured.

Collapse few of the conditions so that the program flow is more clear.

Currently the code would exit without reporting an error as
virBitmapParse reports one only if it fails to parse the bitmap, whereas
the code was jumping to the error label even in case 0 cpus were
correctly parsed in the map.

It's easier to recalculate the number in the one place it's used as
having a separate variable to track it. It will also help with moving
the NUMA code to the separate module.

Name it virNumaMemAccess and add it to conf/numa_conf.[ch]

Note that to avoid a circular dependency the type of the NUMA cell
memAccess variable was changed to int. It will be turned back later
after the circular dependency will not exist.