[Qemu-ppc] [PATCH v4 00/25] ppc/pnv: add XIVE support for KVM guests

[Cédric Le Goater]

Hello,

The QEMU PowerNV machine emulates a baremetal OpenPOWER system and
acts as an hypervisor (L0). Supporting emulation of KVM to run guests
(L1) requires a few more extensions, among which guest support for the
XIVE interrupt controller on POWER9 processor.

The following changes add new per-CPU PowerNV machines and extend the
XIVE models with the new XiveFabric and XivePresenter interfaces to
provide support for XIVE escalations and interrupt resend. This
mechanism is used by XIVE to notify the hypervisor that a vCPU is not
dispatched on a HW thread. Tested on a QEMU PowerNV machine and a
simple QEMU pseries guest doing network on a local bridge.

The XIVE interrupt controller offers a way to increase the XIVE
resources per chip by configuring multiple XIVE blocks on a chip. This
is not currently supported by the model. However, some configurations,
such as OPAL/skiboot, use one block-per-chip configuration with some
optimizations. One of them is to override the hardwired chip ID by the
block id in the PowerBUS operations and for CAM line compares. This
patchset improves the support for this setup. Tested with 4 chips.

A series from Suraj adding guest support in the Radix MMU model of the
QEMU PowerNV machine is still required and will be send later. The
whole patchset can be found under :

  https://github.com/legoater/qemu/tree/powernv-4.2

Thanks,

C.

Changes since v3:

 - reworked the patches introducing the XiveFabric and XivePresenter
   interfaces
 - moved the get_block_id() handler to the XiveRouter
 - new small addons related to the format of the trigger data
 
Changes since v2:

 - introduced the XiveFabric and XivePresenter interfaces
 - removed the need of a XiveRouter pointer under XiveTCTX

Changes since v1:

 - minor extra fixes 
 - split the escalation support in different patches
 - kept the XiveRouter type for XiveTCTX back pointer (will address
   this in P10)
 - removed pnv_xive_vst_size(). Really broken on indirect tables.
 - improved the dump of the NVT table
 - introduce pnv_xive_get_block_id()


Cédric Le Goater (25):
  ppc/xive: Introduce a XivePresenter interface
  ppc/xive: Implement the XivePresenter interface
  ppc/pnv: Introduce a PNV_CHIP_CPU_FOREACH() helper
  ppc/pnv: Introduce a pnv_xive_is_cpu_enabled() helper
  ppc/xive: Introduce a XiveFabric interface
  ppc/pnv: Implement the XiveFabric interface
  ppc/spapr: Implement the XiveFabric interface
  ppc/xive: Use the XiveFabric and XivePresenter interfaces
  ppc/xive: Extend the TIMA operation with a XivePresenter parameter
  ppc/pnv: Clarify how the TIMA is accessed on a multichip system
  ppc/xive: Move the TIMA operations to the controller model
  ppc/xive: Remove the get_tctx() XiveRouter handler
  ppc/xive: Introduce a xive_tctx_ipb_update() helper
  ppc/xive: Introduce helpers for the NVT id
  ppc/xive: Synthesize interrupt from the saved IPB in the NVT
  ppc/pnv: Remove pnv_xive_vst_size() routine
  ppc/pnv: Dump the XIVE NVT table
  ppc/pnv: Skip empty slots of the XIVE NVT table
  ppc/pnv: Introduce a pnv_xive_block_id() helper
  ppc/pnv: Extend XiveRouter with a get_block_id() handler
  ppc/pnv: Quiesce some XIVE errors
  ppc/xive: Introduce a xive_os_cam_decode() helper
  ppc/xive: Check V bit in TM_PULL_POOL_CTX
  ppc/pnv: Improve trigger data definition
  ppc/pnv: Use the EAS trigger bit when triggering an interrupt from PSI

 include/hw/ppc/pnv.h       |  13 ++
 include/hw/ppc/pnv_xive.h  |   3 -
 include/hw/ppc/spapr_irq.h |   6 +
 include/hw/ppc/xive.h      |  72 ++++++--
 include/hw/ppc/xive_regs.h |  48 ++++-
 hw/intc/pnv_xive.c         | 370 +++++++++++++++++++++++++------------
 hw/intc/spapr_xive.c       |  80 +++++++-
 hw/intc/xive.c             | 328 +++++++++++++++++---------------
 hw/ppc/pnv.c               |  32 ++++
 hw/ppc/pnv_psi.c           |  15 +-
 hw/ppc/spapr.c             |  34 ++++
 hw/ppc/spapr_irq.c         |  25 +++
 12 files changed, 730 insertions(+), 296 deletions(-)

-- 
2.21.0