[PATCH v8 00/43] arm64: Support for Arm CCA in KVM
Emi Kisanuki (Fujitsu)
fj0570is at fujitsu.com
Wed May 14 20:01:38 PDT 2025
We tested this patch in our internal simulator which is a hardware simulator for Fujitsu's next generation CPU known as Monaka. and it produced the expected results.
I have verified the following
1. Launching the realm VM using Internal simulator → Successfully launched by disabling MPAM support in the ID register.
2. Running kvm-unit-tests (with lkvm) → All tests passed except for PMU (as expected, since PMU is not supported by the Internal simulator).[1]
Tested-by: Emi Kisanuki <fj0570is at fujitsu.com> [1] https://gitlab.arm.com/linux-arm/kvm-unit-tests-cca cca/v3
Best Regards,
Emi Kisanuki
> 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
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