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Message-Id: <20220524185907.140285-1-mjrosato@linux.ibm.com>
Date: Tue, 24 May 2022 14:58:45 -0400
From: Matthew Rosato <mjrosato@...ux.ibm.com>
To: linux-s390@...r.kernel.org
Cc: alex.williamson@...hat.com, cohuck@...hat.com,
schnelle@...ux.ibm.com, farman@...ux.ibm.com, pmorel@...ux.ibm.com,
borntraeger@...ux.ibm.com, hca@...ux.ibm.com, gor@...ux.ibm.com,
gerald.schaefer@...ux.ibm.com, agordeev@...ux.ibm.com,
svens@...ux.ibm.com, frankja@...ux.ibm.com, david@...hat.com,
imbrenda@...ux.ibm.com, vneethv@...ux.ibm.com,
oberpar@...ux.ibm.com, freude@...ux.ibm.com, thuth@...hat.com,
pasic@...ux.ibm.com, pbonzini@...hat.com, corbet@....net,
jgg@...dia.com, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-doc@...r.kernel.org
Subject: [PATCH v8 00/22] KVM: s390: enable zPCI for interpretive execution
Note: this version of the series is built on top of vfio -next:
https://github.com/awilliam/linux-vfio/tree/next
As it now depends on 'vfio: remove VFIO_GROUP_NOTIFY_SET_KVM' and its
prereqs.
Additionally, if you care to try testing this series on top of vfio -next
you'll also want to pick up this fix:
https://lore.kernel.org/kvm/20220519182929.581898-1-mjrosato@linux.ibm.com/
---
Enable interpretive execution of zPCI instructions + adapter interruption
forwarding for s390x KVM vfio-pci. This is done by triggering a routine
when the VFIO group is associated with the KVM guest, transmitting to
firmware a special token (GISA designation) to enable that specific guest
for interpretive execution on that zPCI device. Load/store interpreation
enablement is then controlled by userspace (based upon whether or not a
SHM bit is placed in the virtual function handle). Adapter Event
Notification interpretation is controlled from userspace via a new KVM
ioctl.
By allowing intepretation of zPCI instructions and firmware delivery of
interrupts to guests, we can reduce the frequency of guest SIE exits for
zPCI.
>From the perspective of guest configuration, you passthrough zPCI devices
in the same manner as before, with intepretation support being used by
default if available in kernel+qemu.
Will follow up with a link an updated QEMU series.
Changelog v7->v8:
- Fix ioctl documentation (Thomas)
- remove copy_to_user from ioctl, was from old version (Thomas)
- KVM_S390_ZPCIOP_REG_AEN: fail on undefined flags (Thomas)
- kvm_s390_pci_zpci_reg_aen: cleanup hostflag setting (Thomas) and
also fix an accidental bit inversion while at it
- CONFIG_VFIO_PCI_ZDEV_KVM: add the 'say Y' that was accidentally left
out of the help text (Jason)
- Restructure the vfio-pci-zdev pieces on top of 'vfio: remove
VFIO_GROUP_NOTIFY_SET_KVM' (Jason) - open_device/close_device will now
call the kvm registration routines directly. Move the open_device call
to vfio_pci_core_enable so that errors can be propogated. For parity,
move the close_device call to vfio_pci_core_disable.
Matthew Rosato (22):
s390/sclp: detect the zPCI load/store interpretation facility
s390/sclp: detect the AISII facility
s390/sclp: detect the AENI facility
s390/sclp: detect the AISI facility
s390/airq: pass more TPI info to airq handlers
s390/airq: allow for airq structure that uses an input vector
s390/pci: externalize the SIC operation controls and routine
s390/pci: stash associated GISA designation
s390/pci: stash dtsm and maxstbl
vfio/pci: introduce CONFIG_VFIO_PCI_ZDEV_KVM
KVM: s390: pci: add basic kvm_zdev structure
KVM: s390: pci: do initial setup for AEN interpretation
KVM: s390: pci: enable host forwarding of Adapter Event Notifications
KVM: s390: mechanism to enable guest zPCI Interpretation
KVM: s390: pci: provide routines for enabling/disabling interrupt
forwarding
KVM: s390: pci: add routines to start/stop interpretive execution
vfio-pci/zdev: add open/close device hooks
vfio-pci/zdev: add function handle to clp base capability
vfio-pci/zdev: different maxstbl for interpreted devices
KVM: s390: add KVM_S390_ZPCI_OP to manage guest zPCI devices
KVM: s390: introduce CPU feature for zPCI Interpretation
MAINTAINERS: additional files related kvm s390 pci passthrough
Documentation/virt/kvm/api.rst | 46 ++
MAINTAINERS | 1 +
arch/s390/include/asm/airq.h | 7 +-
arch/s390/include/asm/kvm_host.h | 26 ++
arch/s390/include/asm/pci.h | 13 +
arch/s390/include/asm/pci_clp.h | 9 +-
arch/s390/include/asm/pci_insn.h | 29 +-
arch/s390/include/asm/sclp.h | 4 +
arch/s390/include/asm/tpi.h | 13 +
arch/s390/include/uapi/asm/kvm.h | 1 +
arch/s390/kvm/Makefile | 1 +
arch/s390/kvm/interrupt.c | 96 ++++-
arch/s390/kvm/kvm-s390.c | 87 +++-
arch/s390/kvm/kvm-s390.h | 10 +
arch/s390/kvm/pci.c | 695 +++++++++++++++++++++++++++++++
arch/s390/kvm/pci.h | 88 ++++
arch/s390/pci/pci.c | 16 +
arch/s390/pci/pci_clp.c | 7 +
arch/s390/pci/pci_insn.c | 4 +-
arch/s390/pci/pci_irq.c | 48 ++-
drivers/s390/char/sclp_early.c | 4 +
drivers/s390/cio/airq.c | 12 +-
drivers/s390/cio/qdio_thinint.c | 6 +-
drivers/s390/crypto/ap_bus.c | 9 +-
drivers/s390/virtio/virtio_ccw.c | 6 +-
drivers/vfio/pci/Kconfig | 11 +
drivers/vfio/pci/Makefile | 2 +-
drivers/vfio/pci/vfio_pci_core.c | 11 +-
drivers/vfio/pci/vfio_pci_zdev.c | 38 +-
include/linux/sched/user.h | 3 +-
include/linux/vfio_pci_core.h | 14 +-
include/uapi/linux/kvm.h | 32 ++
include/uapi/linux/vfio_zdev.h | 7 +
33 files changed, 1300 insertions(+), 56 deletions(-)
create mode 100644 arch/s390/kvm/pci.c
create mode 100644 arch/s390/kvm/pci.h
--
2.27.0
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