[Qemu-devel] [PATCH v8 0/6] target-ppc/spapr: Add FWNMI support in QEMU for PowerKVM guests

[Aravinda Prasad <aravinda@linux.vnet.ibm.com>]

This patch set adds support for FWNMI in PowerKVM guests.

System errors such as SLB multihit and memory errors
that cannot be corrected by hardware is passed on to
the kernel for handling by raising machine check
exception (an NMI). Upon such machine check exceptions,
if the address in error belongs to guest then KVM
invokes guests' 0x200 interrupt vector if the guest
is not FWNMI capable. For FWNMI capable guest
KVM passes the control to QEMU by exiting the guest.

This patch series adds functionality to QEMU to pass
on such machine check exceptions to the FWNMI capable
guest kernel by building an error log and invoking
the guest registered machine check handling routine.

The KVM changes are now part of the upstream kernel
(commit e20bbd3d). This series contain QEMU changes.

Change Log v8:
  - Added functionality to check FWNMI capability during
    VM migration

Change Log v7:
  - Rebased to 4.1

Change Log v6:
  - Fetches rtas_addr from fdt
  - Handles all error conditions (earlier it was only UEs)

Change Log v5:
  - Handled VM migrations by including rtas_addr in VMSTATE.
  - Migration is blocked while a machine check is in progress.

---

Aravinda Prasad (6):
      ppc: spapr: Handle "ibm,nmi-register" and "ibm,nmi-interlock" RTAS calls
      Wrapper function to wait on condition for the main loop mutex
      target/ppc: Handle NMI guest exit
      target/ppc: Build rtas error log upon an MCE
      ppc: spapr: Enable FWNMI capability
      migration: Block migration while handling machine check


 cpus.c                   |    5 +
 hw/ppc/spapr.c           |   26 ++++
 hw/ppc/spapr_caps.c      |   26 ++++
 hw/ppc/spapr_events.c    |  284 ++++++++++++++++++++++++++++++++++++++++++++++
 hw/ppc/spapr_rtas.c      |   84 ++++++++++++++
 include/hw/ppc/spapr.h   |   26 ++++
 include/qemu/main-loop.h |    8 +
 target/ppc/kvm.c         |   30 +++++
 target/ppc/kvm_ppc.h     |    8 +
 target/ppc/trace-events  |    2 
 10 files changed, 497 insertions(+), 2 deletions(-)

--
Aravinda