[PATCH v2 00/16] KVM: arm64: MMIO guard PV services

[Marc Zyngier]

This is the second version of this series initially posted at [1] that
aims at letting a guest express what it considers as MMIO, and only
let this through to userspace. Together with the guest memory made
(mostly) inaccessible to the host kernel and userspace, this allows an
implementation of a hardened IO subsystem.

A lot has been fixed/revamped/improved since the initial posting,
although I am still not pleased with the ioremap plugging on the guest
side. I'll take any idea to get rid of it!

The series is based on 5.15-rc3.

[1] https://lore.kernel.org/kvmarm/20210715163159.1480168-1-maz@xxxxxxxxxx

Marc Zyngier (16):
  KVM: arm64: Generalise VM features into a set of flags
  KVM: arm64: Check for PTE valitity when checking for
    executable/cacheable
  KVM: arm64: Turn kvm_pgtable_stage2_set_owner into
    kvm_pgtable_stage2_annotate
  KVM: arm64: Add MMIO checking infrastructure
  KVM: arm64: Plumb MMIO checking into the fault handling
  KVM: arm64: Force a full unmap on vpcu reinit
  KVM: arm64: Wire MMIO guard hypercalls
  KVM: arm64: Add tracepoint for failed MMIO guard check
  KVM: arm64: Advertise a capability for MMIO guard
  KVM: arm64: Add some documentation for the MMIO guard feature
  firmware/smccc: Call arch-specific hook on discovering KVM services
  mm/vmalloc: Add arch-specific callbacks to track io{remap,unmap}
    physical pages
  arm64: Implement ioremap/iounmap hooks calling into KVM's MMIO guard
  arm64: Enroll into KVM's MMIO guard if required
  arm64: Add a helper to retrieve the PTE of a fixmap
  arm64: Register earlycon fixmap with the MMIO guard

 .../admin-guide/kernel-parameters.txt         |   3 +
 Documentation/virt/kvm/arm/index.rst          |   1 +
 Documentation/virt/kvm/arm/mmio-guard.rst     |  74 ++++++++
 arch/arm/include/asm/hypervisor.h             |   1 +
 arch/arm64/Kconfig                            |   1 +
 arch/arm64/include/asm/fixmap.h               |   2 +
 arch/arm64/include/asm/hypervisor.h           |   2 +
 arch/arm64/include/asm/kvm_host.h             |  14 +-
 arch/arm64/include/asm/kvm_mmu.h              |   5 +
 arch/arm64/include/asm/kvm_pgtable.h          |  12 +-
 arch/arm64/kernel/setup.c                     |   6 +
 arch/arm64/kvm/arm.c                          |  30 ++--
 arch/arm64/kvm/hyp/include/nvhe/mem_protect.h |   2 +-
 arch/arm64/kvm/hyp/nvhe/mem_protect.c         |  11 +-
 arch/arm64/kvm/hyp/nvhe/setup.c               |  10 +-
 arch/arm64/kvm/hyp/pgtable.c                  |  29 ++--
 arch/arm64/kvm/hypercalls.c                   |  38 ++++
 arch/arm64/kvm/mmio.c                         |  20 ++-
 arch/arm64/kvm/mmu.c                          | 111 ++++++++++++
 arch/arm64/kvm/psci.c                         |   8 +
 arch/arm64/kvm/trace_arm.h                    |  17 ++
 arch/arm64/mm/ioremap.c                       | 162 ++++++++++++++++++
 arch/arm64/mm/mmu.c                           |  15 ++
 drivers/firmware/smccc/kvm_guest.c            |   4 +
 include/linux/arm-smccc.h                     |  28 +++
 include/linux/io.h                            |   2 +
 include/uapi/linux/kvm.h                      |   1 +
 mm/Kconfig                                    |   5 +
 mm/vmalloc.c                                  |  12 +-
 29 files changed, 575 insertions(+), 51 deletions(-)
 create mode 100644 Documentation/virt/kvm/arm/mmio-guard.rst

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2.30.2