[PATCH v7 00/10] Enable writable for idregs DFR0,PFR0, MMFR{0,1,2,3}

[Jing Zhang]

This patch series enable userspace writable for below idregs:
ID_AA64DFR0_EL1, ID_DFR0_EL1, ID_AA64PFR0_EL1, ID_AA64MMFR{0, 1, 2, 3}_EL1.
A vm ioctl is added to get feature ID register writable masks from userspace.
A selftest is added to verify that KVM handles the writings from user space
correctly.
A relevant patch from Oliver is picked from [3].
It is based on v6.5-rc4 which contains infrastructure for writable idregs.

---

* v6 -> v7
  - Rebase on v6.5-rc4.
  - Add a vm ioctl to get feature ID register writable masks from userspace.
  - Split the change for debug version in ID_{AA64}DFR0_EL1.
  - Addressed some bugs in selftest.

* v5 -> v6
  - Override the type of field AA64DFR0_EL1_DebugVer to be FTR_LOWER_SAFE by the
    discussion of Oliver and Suraj.

* v4 -> v5
  - Rebase on v6.5-rc1 which contains infrastructure for writable idregs.
  - Use guest ID registers values for the sake of emulation.
  - Added a selftest to verify idreg userspace writing.

* v3 -> v4
  - Rebase on v11 of writable idregs series at [2].

* v2 -> v3
  - Rebase on v6 of writable idregs series.
  - Enable writable for ID_AA64PFR0_EL1 and ID_AA64MMFR{0, 1, 2}_EL1.

* v1 -> v2
  - Rebase on latest patch series [1] of enabling writable ID register.

[1] https://lore.kernel.org/all/20230402183735.3011540-1-jingzhangos@google.com
[2] https://lore.kernel.org/all/20230602005118.2899664-1-jingzhangos@google.com
[3] https://lore.kernel.org/kvmarm/20230623205232.2837077-1-oliver.upton@linux.dev

[v1] https://lore.kernel.org/all/20230326011950.405749-1-jingzhangos@google.com
[v2] https://lore.kernel.org/all/20230403003723.3199828-1-jingzhangos@google.com
[v3] https://lore.kernel.org/all/20230405172146.297208-1-jingzhangos@google.com
[v4] https://lore.kernel.org/all/20230607194554.87359-1-jingzhangos@google.com
[v5] https://lore.kernel.org/all/20230710192430.1992246-1-jingzhangos@google.com
[v6] https://lore.kernel.org/all/20230718164522.3498236-1-jingzhangos@google.com

---

Jing Zhang (8):
  KVM: arm64: Allow userspace to get the writable masks for feature ID
    registers
  KVM: arm64: Document KVM_ARM_GET_FEATURE_ID_WRITABLE_MASKS
  KVM: arm64: Use guest ID register values for the sake of emulation
  KVM: arm64: Enable writable for ID_AA64DFR0_EL1 and ID_DFR0_EL1
  KVM: arm64: Enable writable for ID_AA64PFR0_EL1
  KVM: arm64: Refactor helper Macros for idreg desc
  KVM: arm64: Enable writable for ID_AA64MMFR{0, 1, 2, 3}_EL1
  KVM: arm64: selftests: Test for setting ID register from usersapce

Oliver Upton (2):
  KVM: arm64: Reject attempts to set invalid debug arch version
  KVM: arm64: Bump up the default KVM sanitised debug version to v8p8

 Documentation/virt/kvm/api.rst                |  26 +++
 arch/arm64/include/asm/kvm_host.h             |   2 +
 arch/arm64/include/uapi/asm/kvm.h             |  25 +++
 arch/arm64/kvm/arm.c                          |   3 +
 arch/arm64/kvm/sys_regs.c                     | 191 ++++++++++++------
 include/uapi/linux/kvm.h                      |   2 +
 tools/arch/arm64/include/uapi/asm/kvm.h       |  25 +++
 tools/include/uapi/linux/kvm.h                |   2 +
 tools/testing/selftests/kvm/Makefile          |   1 +
 .../selftests/kvm/aarch64/set_id_regs.c       | 191 ++++++++++++++++++
 10 files changed, 408 insertions(+), 60 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/aarch64/set_id_regs.c


base-commit: 5d0c230f1de8c7515b6567d9afba1f196fb4e2f4
-- 
2.41.0.585.gd2178a4bd4-goog