[PATCH v1 0/6] Support writable CPU ID registers from userspace

This patchset refactors/adds code to support writable per guest CPU ID feature
registers. Part of the code/ideas are from [1].
No functional change is intended in this patchset. With the new CPU ID feature
registers infrastructure, only writtings of ID_AA64PFR0_EL1.[CSV2|CSV3],
ID_AA64DFR0_EL1.PMUVer and ID_DFR0_ELF.PerfMon are allowed as KVM does before.

Writable (Configurable) per guest CPU ID feature registers are useful for
creating/migrating guest on ARM CPUs with different kinds of features.

---

[1] https://lore.kernel.org/all/20220419065544.3616948-1-reijiw@google.com (local)

---

Jing Zhang (5):
  KVM: arm64: Move CPU ID feature registers emulation into a separate
    file
  KVM: arm64: Use per guest ID register for ID_AA64PFR0_EL1.[CSV2|CSV3]
  KVM: arm64: Use per guest ID register for ID_AA64DFR0_EL1.PMUVer
  KVM: arm64: Introduce ID register specific descriptor
  KVM: arm64: Refactor writings for PMUVer/CSV2/CSV3

Reiji Watanabe (1):
  KVM: arm64: Save ID registers' sanitized value per guest

 arch/arm64/include/asm/cpufeature.h |  25 +
 arch/arm64/include/asm/kvm_host.h   |  20 +-
 arch/arm64/kernel/cpufeature.c      |  26 +-
 arch/arm64/kvm/Makefile             |   2 +-
 arch/arm64/kvm/arm.c                |  24 +-
 arch/arm64/kvm/hyp/nvhe/sys_regs.c  |   7 +-
 arch/arm64/kvm/id_regs.c            | 738 ++++++++++++++++++++++++++++
 arch/arm64/kvm/sys_regs.c           | 465 ++----------------
 arch/arm64/kvm/sys_regs.h           |  30 ++
 include/kvm/arm_pmu.h               |   6 +-
 10 files changed, 844 insertions(+), 499 deletions(-)
 create mode 100644 arch/arm64/kvm/id_regs.c


base-commit: a875b2475abff82b2318886da6d29c34db678dd5
-- 
2.39.1.456.gfc5497dd1b-goog


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel