This series adds support for running protected VMs using KVM under the Arm Confidential Compute Architecture (CCA). The related guest support was posted[1] earlier. As with the guest this series moves to the "v1.0-rel0" version of the specification[2]. Almost all changes since v4[3] are either due to rebasing or minor changes to improve the code following review comments. There are two bug fixes: * Setting the GPRS on entry after an exit where the host is allowed to change registers is now done in kvm_rec_enter(). This fixes a bug where register updates done by user space were being ignored. * Drop the PTE_SHARED bit for unprotected page table entries - this bit isn't controlled by the host and the RMM now enforces the bit is zero. Major limitations: * Only supports 4k host PAGE_SIZE (if PAGE_SIZE != 4k then the realm extensions are disabled). * 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. The ABI to the RMM (the RMI) is based on RMM v1.0-rel0 specification[2]. This series is based on v6.12-rc1. It is also available as a git repository: https://gitlab.arm.com/linux-arm/linux-cca cca-host/v5 Work in progress changes for kvmtool are available from the git repository below: https://gitlab.arm.com/linux-arm/kvmtool-cca cca/v3 [1] https://lore.kernel.org/r/20241004144307.66199-1-steven.price%40arm.com [2] https://developer.arm.com/documentation/den0137/1-0rel0/ [3] https://lore.kernel.org/r/20240821153844.60084-1-steven.price%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 (29): 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: Keep a spare page delegated to the RMM arm64: RME: RTT tear down arm64: RME: Allocate/free RECs to match vCPUs 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: Allow activating realms Suzuki K Poulose (4): kvm: arm64: pgtable: Track the number of pages in the entry level 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 | 34 + arch/arm64/include/asm/kvm_host.h | 16 +- arch/arm64/include/asm/kvm_pgtable.h | 2 + arch/arm64/include/asm/kvm_rme.h | 155 +++ arch/arm64/include/asm/rmi_cmds.h | 510 ++++++++ arch/arm64/include/asm/rmi_smc.h | 255 ++++ 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 | 166 ++- arch/arm64/kvm/guest.c | 99 +- arch/arm64/kvm/hyp/pgtable.c | 5 +- arch/arm64/kvm/hypercalls.c | 4 +- arch/arm64/kvm/inject_fault.c | 2 + arch/arm64/kvm/mmio.c | 10 +- arch/arm64/kvm/mmu.c | 185 ++- arch/arm64/kvm/pmu-emul.c | 7 +- arch/arm64/kvm/psci.c | 29 + arch/arm64/kvm/reset.c | 23 +- arch/arm64/kvm/rme-exit.c | 207 ++++ arch/arm64/kvm/rme.c | 1628 ++++++++++++++++++++++++++ arch/arm64/kvm/sys_regs.c | 83 +- arch/arm64/kvm/vgic/vgic-v3.c | 8 +- arch/arm64/kvm/vgic/vgic.c | 41 +- 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 + 36 files changed, 3569 insertions(+), 101 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 -- 2.34.1
