[PATCH v6 0/6] Enable writable for idregs DFR0,PFR0, MMFR{0,1,2, 3}

[Jing Zhang]

Please ignore this post of v6 which missed a commit. I'll send out the
correct v6 soon.

Thanks,
Jing

On Mon, Jul 17, 2023 at 8:27 AM Jing Zhang <jingzhangos at google.com> wrote:
>
> 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.
>
> It is based on v6.5-rc1 which contains infrastructure for writable idregs.
>
> A selftest is added to verify that KVM handles the writings from user space
> correctly.
>
> A relevant patch from Oliver is picked from [3].
>
> ---
>
> * 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 v6.4-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
>
> ---
>
> Jing Zhang (4):
>   KVM: arm64: Use guest ID register values for the sake of emulation
>   KVM: arm64: Enable writable for ID_AA64PFR0_EL1
>   KVM: arm64: Enable writable for ID_AA64MMFR{0, 1, 2, 3}_EL1
>   KVM: arm64: selftests: Test for setting ID register from usersapce
>
> Oliver Upton (1):
>   KVM: arm64: Reject attempts to set invalid debug arch version
>
>  arch/arm64/kvm/sys_regs.c                     |  80 +++++++--
>  tools/testing/selftests/kvm/Makefile          |   1 +
>  .../selftests/kvm/aarch64/set_id_regs.c       | 163 ++++++++++++++++++
>  3 files changed, 230 insertions(+), 14 deletions(-)
>  create mode 100644 tools/testing/selftests/kvm/aarch64/set_id_regs.c
>
>
> base-commit: 06c2afb862f9da8dc5efa4b6076a0e48c3fbaaa5
> --
> 2.41.0.255.g8b1d071c50-goog
>