This series adds support for running protected VMs using KVM under the
Arm Confidential Compute Architecture (CCA).
The related guest support was merged for v6.14-rc1 so you no longer need
that separately.
There are a few changes since v7, many thanks for the review
comments. The highlights are below, and individual patches have a changelog.
* More documentation - the new ioctls and capabilties are now all
documented.
* Initial patch adding "only_private"/"only_shared" to struct
kvm_gfn_range replaced with already upstream "attr_filter".
* Improvement in variable naming and error codes, and some improved/new
comments. All following valuable review feedback (thanks!).
* Drop the final WIP patch for enabling large PAGE_SIZE support. It's
not ready for merging and I want to focus on landing the 4k support.
* Rebased onto v6.15-rc1.
Things to note:
* The magic numbers for capabilities and ioctls have been updated. So
you'll need to update your VMM. See below for update kvmtool branch.
* Patch 42 increases KVM_VCPU_MAX_FEATURES to expose the new feature.
This also exposes the NV features (as they are currently numbered
lower). This will resolve when Marc's NV series has landed, see [2].
* There are some conflicts with v6.15-rc2, mostly documentation, but
also commit 26fbdf369227 ("KVM: arm64: Don't translate FAR if
invalid/unsafe") 'hijacks' HPFAR_EL2_NS as a valid bit. This will
require corresponding changes to the CCA code.
The ABI to the RMM (the RMI) is based on RMM v1.0-rel0 specification[1].
This series is based on v6.15-rc1. It is also available as a git
repository:
https://gitlab.arm.com/linux-arm/linux-cca cca-host/v8
Work in progress changes for kvmtool are available from the git
repository below:
https://gitlab.arm.com/linux-arm/kvmtool-cca cca/v6
[1] https://developer.arm.com/documentation/den0137/1-0rel0/
[2] https://lore.kernel.org/r/20250408105225.4002637-17-maz%40kernel.org
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
Steven Price (31):
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
KVM: arm64: 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
arm64: RME: Handle RMI_EXIT_RIPAS_CHANGE
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
arm64: RME: Hide KVM_CAP_READONLY_MEM for realm guests
KVM: arm64: 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: Don't expose debug capabilities for realm guests
arm64: RME: Allow checking SVE on VM instance
Documentation/virt/kvm/api.rst | 91 +-
arch/arm64/include/asm/kvm_emulate.h | 40 +
arch/arm64/include/asm/kvm_host.h | 17 +-
arch/arm64/include/asm/kvm_rme.h | 137 +++
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 | 48 +-
arch/arm64/kvm/arm.c | 160 ++-
arch/arm64/kvm/guest.c | 104 +-
arch/arm64/kvm/hypercalls.c | 4 +-
arch/arm64/kvm/inject_fault.c | 5 +-
arch/arm64/kvm/mmio.c | 16 +-
arch/arm64/kvm/mmu.c | 201 ++-
arch/arm64/kvm/pmu-emul.c | 6 +
arch/arm64/kvm/psci.c | 30 +
arch/arm64/kvm/reset.c | 23 +-
arch/arm64/kvm/rme-exit.c | 199 +++
arch/arm64/kvm/rme.c | 1708 ++++++++++++++++++++++++++
arch/arm64/kvm/sys_regs.c | 49 +-
arch/arm64/kvm/vgic/vgic-init.c | 2 +-
arch/arm64/kvm/vgic/vgic-v3.c | 6 +-
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/perf/arm_pmu.h | 5 +
include/uapi/linux/kvm.h | 29 +-
33 files changed, 3709 insertions(+), 100 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
--
2.43.0