[PATCH v6 00/43] arm64: Support for Arm CCA in KVM

From: Steven Price
Date: Thu Dec 12 2024 - 11:04:09 EST

This series adds support for running protected VMs using KVM under the
Arm Confidential Compute Architecture (CCA).

The related guest support was merged for v6.13-rc1 so you no longer need
that separately.

There are numerous changes since v5, many thanks for the review
comments. The highlights are below, and individual patches have a changelog.

* KVM_VCPU_MAX_FEATURES is incremented. *NOTE*: This effectively
exposes the nested virtualisation feature. So this series as it
stands has a dependency on that being finished before it can be
merged. See [2] for more details.

* Properly support the RMM providing a more limited number of GIC LRs
than the hardware.

* Drop patch tracking number of pages for the top level PGD, it's
easier calculating it when we need it.

* Drop the "spare page" - it was causing code complexity and it's a bit
premature to start making such optimisations before we've got real
platforms to benchmark.

Major limitations:

* Only supports 4k host PAGE_SIZE (if PAGE_SIZE != 4k then the realm
extensions are disabled). I'm looking at removing this restriction,
but I didn't want to delay this posting.

* No support for huge pages when mapping the guest's pages. There is
some 'dead' code left over from before guest_mem was supported. This
is partly a current limitation of guest_memfd. It's also on my todo list to
look at improving this.

The ABI to the RMM (the RMI) is based on RMM v1.0-rel0 specification[1].

This series is based on v6.13-rc1. It is also available as a git
repository:

https://gitlab.arm.com/linux-arm/linux-cca cca-host/v6

Work in progress changes for kvmtool are available from the git
repository below:

https://gitlab.arm.com/linux-arm/kvmtool-cca cca/v4

[1] https://developer.arm.com/documentation/den0137/1-0rel0/
[2] https://lore.kernel.org/r/a7011738-a084-46fa-947f-395d90b37f8b%40arm.com

Jean-Philippe Brucker (7):
arm64: RME: Propagate number of breakpoints and watchpoints to
userspace
arm64: RME: Set breakpoint parameters through SET_ONE_REG
arm64: RME: Initialize PMCR.N with number counter supported by RMM
arm64: RME: Propagate max SVE vector length from RMM
arm64: RME: Configure max SVE vector length for a Realm
arm64: RME: Provide register list for unfinalized RME RECs
arm64: RME: Provide accurate register list

Joey Gouly (2):
arm64: rme: allow userspace to inject aborts
arm64: rme: support RSI_HOST_CALL

Sean Christopherson (1):
KVM: Prepare for handling only shared mappings in mmu_notifier events

Steven Price (30):
arm64: RME: Handle Granule Protection Faults (GPFs)
arm64: RME: Add SMC definitions for calling the RMM
arm64: RME: Add wrappers for RMI calls
arm64: RME: Check for RME support at KVM init
arm64: RME: Define the user ABI
arm64: RME: ioctls to create and configure realms
arm64: kvm: Allow passing machine type in KVM creation
arm64: RME: RTT tear down
arm64: RME: Allocate/free RECs to match vCPUs
KVM: arm64: vgic: Provide helper for number of list registers
arm64: RME: Support for the VGIC in realms
KVM: arm64: Support timers in realm RECs
arm64: RME: Allow VMM to set RIPAS
arm64: RME: Handle realm enter/exit
KVM: arm64: Handle realm MMIO emulation
arm64: RME: Allow populating initial contents
arm64: RME: Runtime faulting of memory
KVM: arm64: Handle realm VCPU load
KVM: arm64: Validate register access for a Realm VM
KVM: arm64: Handle Realm PSCI requests
KVM: arm64: WARN on injected undef exceptions
arm64: Don't expose stolen time for realm guests
arm64: RME: Always use 4k pages for realms
arm64: rme: Prevent Device mappings for Realms
arm_pmu: Provide a mechanism for disabling the physical IRQ
arm64: rme: Enable PMU support with a realm guest
kvm: rme: Hide KVM_CAP_READONLY_MEM for realm guests
arm64: kvm: Expose support for private memory
KVM: arm64: Expose KVM_ARM_VCPU_REC to user space
KVM: arm64: Allow activating realms

Suzuki K Poulose (3):
kvm: arm64: Include kvm_emulate.h in kvm/arm_psci.h
kvm: arm64: Expose debug HW register numbers for Realm
arm64: rme: Allow checking SVE on VM instance

Documentation/virt/kvm/api.rst | 3 +
arch/arm64/include/asm/kvm_emulate.h | 40 +
arch/arm64/include/asm/kvm_host.h | 17 +-
arch/arm64/include/asm/kvm_rme.h | 152 +++
arch/arm64/include/asm/rmi_cmds.h | 508 ++++++++
arch/arm64/include/asm/rmi_smc.h | 259 +++++
arch/arm64/include/asm/virt.h | 1 +
arch/arm64/include/uapi/asm/kvm.h | 49 +
arch/arm64/kvm/Kconfig | 1 +
arch/arm64/kvm/Makefile | 3 +-
arch/arm64/kvm/arch_timer.c | 45 +-
arch/arm64/kvm/arm.c | 174 ++-
arch/arm64/kvm/guest.c | 107 +-
arch/arm64/kvm/hypercalls.c | 4 +-
arch/arm64/kvm/inject_fault.c | 6 +-
arch/arm64/kvm/mmio.c | 16 +-
arch/arm64/kvm/mmu.c | 195 +++-
arch/arm64/kvm/pmu-emul.c | 6 +
arch/arm64/kvm/psci.c | 29 +
arch/arm64/kvm/reset.c | 23 +-
arch/arm64/kvm/rme-exit.c | 195 ++++
arch/arm64/kvm/rme.c | 1588 ++++++++++++++++++++++++++
arch/arm64/kvm/sys_regs.c | 79 +-
arch/arm64/kvm/vgic/vgic-init.c | 2 +-
arch/arm64/kvm/vgic/vgic-v3.c | 5 +
arch/arm64/kvm/vgic/vgic.c | 54 +-
arch/arm64/mm/fault.c | 31 +-
drivers/perf/arm_pmu.c | 15 +
include/kvm/arm_arch_timer.h | 2 +
include/kvm/arm_pmu.h | 4 +
include/kvm/arm_psci.h | 2 +
include/linux/kvm_host.h | 2 +
include/linux/perf/arm_pmu.h | 5 +
include/uapi/linux/kvm.h | 31 +-
virt/kvm/kvm_main.c | 7 +
35 files changed, 3557 insertions(+), 103 deletions(-)
create mode 100644 arch/arm64/include/asm/kvm_rme.h
create mode 100644 arch/arm64/include/asm/rmi_cmds.h
create mode 100644 arch/arm64/include/asm/rmi_smc.h
create mode 100644 arch/arm64/kvm/rme-exit.c
create mode 100644 arch/arm64/kvm/rme.c

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2.43.0