kvm tools: arm: extract common timer support code for ARM cpus

The ARM V7 and V8 CPUs use the nearly identical support code for generating
timer DT nodes as they both use ARM's architected timers. This code is currently
duplicated for AArch32 and AArch64.

This cleanup patch generalises timer DT node generation to follow the same
pattern as for the GIC. The ability of a DT node to contain multiple compatible
strings is exploited to allow an identical DT node to be used on V7 and V8
platforms.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Jonathan Austin <jonathan.austin@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
kvm tools: arm: add support for ARM Cortex-A7

The Cortex-A7 is very similar to the Cortex-A15 and as such there is very
little extra infrastructure required for KVM tool to be able to create
A7-guests.

This patch adds the basic support and allows booting of A7 guests on A7
hosts. It depends on Cortex-A7 support patches posted recently to the kvmarm
list.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Jonathan Austin <jonathan.austin@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
kvm tools: arm: emit the MPIDR in DT instead of cpu_id

kvmtools uses the virtual CPU number to emit the DT CPU nodes.
While this is correct for a flat topology, it fails on anything
else, as the guest expects to find the MPIDR there.

The fix is to ask the kernel for each vcpu MPIDR, and emit this
instead.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
kvm tools: support unsigned int options

Add support for unsigned int command-line options by implementing the
OPT_UINTEGER macro.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
kvm tools: arm: add option to override generic timer frequency

Some platforms have secure firmware which does not correctly set the
CNTFRQ register on boot, preventing the use of the Generic Timer.
This patch allows mirroring the necessary host workaround by specifying
the clock-frequency property in the guest DT.

This should only be considered a means of KVM bring-up on such systems,
such that vendors may be convinced to properly implement their firmware
to support the virtualisation capabilities of their hardware.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>