[PATCH] x86: Set FSGSBASE to active if enabled by kernel

H.J. Lu hjl.tools@gmail.com
Thu Mar 16 00:42:40 GMT 2023


On Mon, Mar 13, 2023 at 6:44 AM Florian Weimer <fweimer@redhat.com> wrote:
>
> * H. J. Lu:
>
> > Linux kernel uses AT_HWCAP2 to indicate if FSGSBASE instructions are
> > enabled.  If the HWCAP2_FSGSBASE bit in AT_HWCAP2 is set, FSGSBASE
> > instructions can be used in user space.  Define dl_check_hwcap2 to set
> > the FSGSBASE feature to active on Linux when the HWCAP2_FSGSBASE bit is
> > set.
>
> Could you add a test against /proc/cpuinfo flags?  It should be a
> perfect match on current kernels.
>

Will do.

Thanks.

-- 
H.J.


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