[RFC][PATCH 00/16] uq/master: Introduce basic irqchip support

[Jan Kiszka <jan.kiszka@web.de>]

Some weeks back I posted my MSI rework for qemu-kvm that shall once help
integrating those bits into upstream. After that I wondered how a
rewritten in-kernel irqchip model could look like and make use of this.
But then I realized that there is actually no technical need to role out
a first version of kvm irqchips that already support MSI. As the MSI
thing will likely take a few more iterations, I now decided to rush
forward with basic kvm irqchip for QEMU upstream. Here we go.

My idea was always to create proper alternatives to the existing user
space device models while keeping the vmstates 100% compatible. I think
I succeeded in this, tests worked fine so far. The kvm and the user
space models now have a common core where they share logic and specific
code modules where they differ. Also, I moved all kvm devices into
hw/kvm.

The in-kernel irqchip support can be controlled via a machine property
(-machine ...,kernel_irqchip=on), in contrast to qemu-kvm's dedicated
command line switch. This series keeps the support off by default
because we still lack the MSI bits as I explained. Also, in-kernel PIT
is not yet implemented and TPR patching/VAPIC (for Windows guests).

The merge story would basically look similar to what we did before with
the clean-room reimplementation of kvm for QEMU: Merge into upstream,
merge back into qemu-kvm, disabling the new bits for now, then gradually
switching over to the new services, specifically once they are
feature-equivalent. Of course, I will support these steps as usual.

So, feedback and review welcome!

Jan Kiszka (16):
  msi: Generalize msix_supported to msi_supported
  kvm: Move kvmclock into hw/kvm folder
  apic: Stop timer on reset
  apic: Factor out core for KVM reuse
  apic: Open-code timer save/restore
  i8259: Factor out core for KVM reuse
  ioapic: Convert to memory API
  ioapic: Reject non-dword accesses to IOWIN register
  ioapic: Factor out core for KVM reuse
  memory: Introduce memory_region_init_reservation
  kvm: Introduce core services for in-kernel irqchip support
  kvm: x86: Establish IRQ0 override control
  kvm: x86: Add user space part for in-kernel APIC
  kvm: x86: Add user space part for in-kernel i8259
  kvm: x86: Add user space part for in-kernel IOAPIC
  kvm: Arm in-kernel irqchip support

 Makefile.objs                  |    2 +-
 Makefile.target                |    6 +-
 configure                      |    1 +
 hw/apic.c                      |  288 ++++------------------------------------
 hw/apic_common.c               |  262 ++++++++++++++++++++++++++++++++++++
 hw/apic_internal.h             |  111 +++++++++++++++
 hw/i8259.c                     |   78 +-----------
 hw/i8259_common.c              |  103 ++++++++++++++
 hw/i8259_internal.h            |   67 +++++++++
 hw/ioapic.c                    |  136 +++----------------
 hw/ioapic_common.c             |   89 ++++++++++++
 hw/ioapic_internal.h           |   94 +++++++++++++
 hw/kvm/apic.c                  |  147 ++++++++++++++++++++
 hw/{kvmclock.c => kvm/clock.c} |   10 +-
 hw/{kvmclock.h => kvm/clock.h} |    0
 hw/kvm/i8259.c                 |  154 +++++++++++++++++++++
 hw/kvm/ioapic.c                |  120 +++++++++++++++++
 hw/msi.c                       |    8 +
 hw/msi.h                       |    2 +
 hw/msix.c                      |    9 +-
 hw/msix.h                      |    2 -
 hw/pc.c                        |   20 ++-
 hw/pc.h                        |    1 +
 hw/pc_piix.c                   |   67 +++++++++-
 kvm-all.c                      |  154 +++++++++++++++++++++
 kvm-stub.c                     |    5 +
 kvm.h                          |   13 ++
 memory.c                       |   35 +++++
 memory.h                       |   15 ++
 qemu-config.c                  |    4 +
 qemu-options.hx                |    5 +-
 sysemu.h                       |    1 -
 target-i386/kvm.c              |   19 +++
 trace-events                   |    2 +-
 vl.c                           |    1 -
 35 files changed, 1548 insertions(+), 483 deletions(-)
 create mode 100644 hw/apic_common.c
 create mode 100644 hw/apic_internal.h
 create mode 100644 hw/i8259_common.c
 create mode 100644 hw/i8259_internal.h
 create mode 100644 hw/ioapic_common.c
 create mode 100644 hw/ioapic_internal.h
 create mode 100644 hw/kvm/apic.c
 rename hw/{kvmclock.c => kvm/clock.c} (96%)
 rename hw/{kvmclock.h => kvm/clock.h} (100%)
 create mode 100644 hw/kvm/i8259.c
 create mode 100644 hw/kvm/ioapic.c

-- 
1.7.3.4