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[Qemu-devel] [RFC PATCH v2 00/21] Guest exploitation of the XIVE interru
From: |
Cédric Le Goater |
Subject: |
[Qemu-devel] [RFC PATCH v2 00/21] Guest exploitation of the XIVE interrupt controller (POWER9) |
Date: |
Mon, 11 Sep 2017 19:12:14 +0200 |
On a POWER9 sPAPR machine, the Client Architecture Support (CAS)
negotiation process determines whether the guest operates with an
interrupt controller using the XICS legacy model, as found on POWER8,
or in XIVE exploitation mode, the newer POWER9 interrupt model. This
patchset is a proposal to add XIVE support in POWER9 sPAPR machine.
Follows a model for the XIVE interrupt controller and support for the
Hypervisor's calls which are used to configure the interrupt sources
and the event/notification queues of the guest. The last patch
integrates XIVE in the sPAPR machine.
Code is here:
https://github.com/legoater/qemu/commits/xive
Caveats :
- IRQ allocator : making progress
The sPAPR machine make uses of the interrupt controller very early
in the initialization sequence to allocate IRQ numbers and populate
the device tree. CAS requires XIVE to be able to switch interrupt
model and consequently have the models share a common IRQ allocator.
I have chosen to link the sPAPR XICS interrupt source into XIVE to
share the ICSIRQState array which acts as an IRQ allocator. This
can be improved.
- Interrupt presenter :
The register data is directly stored under the ICPState structure
which is shared with all other sPAPR interrupt controller models.
- KVM support : not addressed yet
The guest needs to be run with kernel_irqchip=off on a POWER9 system.
- LSI : lightly tested.
Thanks,
C.
Changes since RFC v1:
- removed initial complexity due to a tentative try to support
PowerNV. This will come later.
- removed specific XIVE interrupt source and presenter models
- renamed files and typedefs
- removed print_info() handler
- introduced a CAS reset to rebuild the device tree
- linked the XIVE model with the sPAPR XICS interrupt source to share
the IRQ allocator
- improved hcall support (still some missing but they are not used
under Linux)
- improved device tree
- should have addressed comments in first RFC
- and much more ... Next version should have a better changelog.
Cédric Le Goater (21):
ppc/xive: introduce a skeleton for the sPAPR XIVE interrupt controller
migration: add VMSTATE_STRUCT_VARRAY_UINT32_ALLOC
ppc/xive: define the XIVE internal tables
ppc/xive: provide a link to the sPAPR ICS object under XIVE
ppc/xive: allocate IRQ numbers for the IPIs
ppc/xive: introduce handlers for interrupt sources
ppc/xive: add MMIO handlers for the XIVE interrupt sources
ppc/xive: describe the XIVE interrupt source flags
ppc/xive: extend the interrupt presenter model for XIVE
ppc/xive: add MMIO handlers for the XIVE TIMA
ppc/xive: push the EQ data in OS event queue
ppc/xive: notify the CPU when interrupt priority is more privileged
ppc/xive: handle interrupt acknowledgment by the O/S
ppc/xive: add support for the SET_OS_PENDING command
spapr: modify spapr_populate_pci_dt() to use a 'nr_irqs' argument
spapr: add a XIVE object to the sPAPR machine
ppc/xive: add hcalls support
ppc/xive: add device tree support
ppc/xive: introduce a helper to map the XIVE memory regions
ppc/xics: introduce a qirq_get() helper in the XICSFabric
spapr: activate XIVE exploitation mode
default-configs/ppc64-softmmu.mak | 1 +
hw/intc/Makefile.objs | 1 +
hw/intc/spapr_xive.c | 821 +++++++++++++++++++++++++++++++++
hw/intc/spapr_xive_hcall.c | 930 ++++++++++++++++++++++++++++++++++++++
hw/intc/xics.c | 11 +-
hw/intc/xive-internal.h | 189 ++++++++
hw/ppc/spapr.c | 110 ++++-
hw/ppc/spapr_hcall.c | 6 +
hw/ppc/spapr_pci.c | 4 +-
include/hw/pci-host/spapr.h | 2 +-
include/hw/ppc/spapr.h | 17 +-
include/hw/ppc/spapr_xive.h | 75 +++
include/hw/ppc/xics.h | 7 +
include/migration/vmstate.h | 10 +
14 files changed, 2169 insertions(+), 15 deletions(-)
create mode 100644 hw/intc/spapr_xive.c
create mode 100644 hw/intc/spapr_xive_hcall.c
create mode 100644 hw/intc/xive-internal.h
create mode 100644 include/hw/ppc/spapr_xive.h
--
2.13.5
- [Qemu-devel] [RFC PATCH v2 00/21] Guest exploitation of the XIVE interrupt controller (POWER9),
Cédric Le Goater <=
- [Qemu-devel] [RFC PATCH v2 01/21] ppc/xive: introduce a skeleton for the sPAPR XIVE interrupt controller, Cédric Le Goater, 2017/09/11
- Re: [Qemu-devel] [RFC PATCH v2 01/21] ppc/xive: introduce a skeleton for the sPAPR XIVE interrupt controller, David Gibson, 2017/09/19
- Re: [Qemu-devel] [RFC PATCH v2 01/21] ppc/xive: introduce a skeleton for the sPAPR XIVE interrupt controller, Cédric Le Goater, 2017/09/19
- Re: [Qemu-devel] [RFC PATCH v2 01/21] ppc/xive: introduce a skeleton for the sPAPR XIVE interrupt controller, David Gibson, 2017/09/22
- Re: [Qemu-devel] [RFC PATCH v2 01/21] ppc/xive: introduce a skeleton for the sPAPR XIVE interrupt controller, Cédric Le Goater, 2017/09/22
- Re: [Qemu-devel] [RFC PATCH v2 01/21] ppc/xive: introduce a skeleton for the sPAPR XIVE interrupt controller, David Gibson, 2017/09/25
- Re: [Qemu-devel] [RFC PATCH v2 01/21] ppc/xive: introduce a skeleton for the sPAPR XIVE interrupt controller, Benjamin Herrenschmidt, 2017/09/26
[Qemu-devel] [RFC PATCH v2 02/21] migration: add VMSTATE_STRUCT_VARRAY_UINT32_ALLOC, Cédric Le Goater, 2017/09/11
[Qemu-devel] [RFC PATCH v2 03/21] ppc/xive: define the XIVE internal tables, Cédric Le Goater, 2017/09/11