[PATCH v4 0/4] Enable writable for idregs DFR0,PFR0, MMFR{0,1,2}

[Jing Zhang]

Hi Oliver,

On Mon, Jun 26, 2023 at 1:52 PM Oliver Upton <oliver.upton at linux.dev> wrote:
>
> Hi Jing,
>
> On Wed, Jun 07, 2023 at 07:45:50PM +0000, Jing Zhang wrote:
> >
> > This patch series enable userspace writable for below idregs:
> > ID_AA64DFR0_EL1, ID_DFR0_EL1, ID_AA64PFR0_EL1, ID_AA64MMFR{0, 1, 2}_EL1.
> >
> > It is based on below series [2] which add infrastructure for writable idregs.
>
> Could you implement some tests for these changes? We really need to see
> that userspace is only allowed to select a subset of features that're
> provided by the host, and that the CPU feature set never exceeds what
> the host can support.
Sure, will add a selftest for these.
>
> Additionally, there are places in the kernel where we use host ID
> register values for the sake of emulation (DBGDIDR, LORegion). These
> both should instead be using the _guest_ ID register values.
Will add a new commit for these change.
>
> --
> Thanks,
> Oliver

Thanks,
Jing