numa.c: convert to xen coding style

Convert to Xen coding style from mixed one.

Signed-off-by: Elena Ufimtseva <ufimtseva@gmail.com>
x86: remove redundancy of MSR_P6_{PERFCTR,EVNTSEL} definitions

Not only did the EVNTSEL ones get defined twice, we can also easily
abstract out the numbers previously attached to them.

While at it also remove an unused Geode-related define.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Kevin Tian <kevint.tian@intel.com>
xen: vnuma topology and subop hypercalls

Define interface, structures and hypercalls for toolstack to
build vnuma topology and for guests that wish to retrieve it.
Two subop hypercalls introduced by patch:
XEN_DOMCTL_setvnumainfo to define vNUMA domain topology per domain
and XENMEM_get_vnumainfo to retrieve that topology by guest.

Signed-off-by: Elena Ufimtseva <ufimtseva@gmail.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
xsm bits for vNUMA hypercalls

Define xsm_get_vnumainfo hypercall used for domain which
wish to receive vnuma topology. Add xsm hook for
XEN_DOMCTL_setvnumainfo. Also adds basic policies.

Signed-off-by: Elena Ufimtseva <ufimtseva@gmail.com>
Acked-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
libxc: Introduce xc_domain_setvnuma to set vNUMA

With the introduction of the XEN_DOMCTL_setvnumainfo
in patch titled: "xen: vnuma topology and subop hypercalls"
we put in the plumbing here to use from the toolstack. The user
is allowed to call this multiple times if they wish so.
It will error out if the nr_vnodes or nr_vcpus is zero.

Signed-off-by: Elena Ufimtseva <ufimtseva@gmail.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
vNUMA: fix build on ARM after commit 9695014966

The new domctl isn't really x86-specific.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Tested-by: Ian Campbell <ian.campbell@citrix.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
xen: add real time scheduler rt

This scheduler follows the Preemptive Global Earliest Deadline First
(EDF) theory in real-time field.
At any scheduling point, the VCPU with earlier deadline has higher
priority. The scheduler always pick the highest priority VCPU to run on a
feasible PCPU.
A PCPU is feasible if the VCPU can run on this PCPU and (the PCPU is
idle or has a lower-priority VCPU running on it.)

Each VCPU has a dedicated period and budget.
The deadline of a VCPU is at the end of each of its periods;
A VCPU has its budget replenished at the beginning of each of its periods;
While scheduled, a VCPU burns its budget.
The VCPU needs to finish its budget before its deadline in each period;
The VCPU discards its unused budget at the end of each of its periods.
If a VCPU runs out of budget in a period, it has to wait until next period.

Each VCPU is implemented as a deferable server.
When a VCPU has a task running on it, its budget is continuously burned;
When a VCPU has no task but with budget left, its budget is preserved.

Queue scheme: A global runqueue for each CPU pool.
The runqueue holds all runnable VCPUs.
VCPUs in the runqueue are divided into two parts: with and without budget.
At the first part, VCPUs are sorted based on EDF priority scheme.

Note: cpumask and cpupool is supported.

This is an experimental scheduler.

Signed-off-by: Meng Xu <mengxu@cis.upenn.edu>
Signed-off-by: Sisu Xi <xisisu@gmail.com>
libxc: add rt scheduler

Add xc_sched_rt_* functions to interact with Xen to set/get domain's
parameters for rt scheduler.
Note: VCPU's information (period, budget) is in microsecond (us).

Signed-off-by: Meng Xu <mengxu@cis.upenn.edu>
Signed-off-by: Sisu Xi <xisisu@gmail.com>
libxl: add rt scheduler

Add libxl functions to set/get domain's parameters for rt scheduler
Note: VCPU's information (period, budget) is in microsecond (us).

Signed-off-by: Meng Xu <mengxu@cis.upenn.edu>
Signed-off-by: Sisu Xi <xisisu@gmail.com>
xl: introduce rt scheduler

Add xl command for rt scheduler
Note: VCPU's parameter (period, budget) is in microsecond (us).

Signed-off-by: Meng Xu <mengxu@cis.upenn.edu>
Signed-off-by: Sisu Xi <xisisu@gmail.com>