From: "H.J. Lu" <hjl.tools@gmail.com>
To: Florian Weimer <fweimer@redhat.com>
Cc: libc-alpha@sourceware.org
Subject: Re: [PATCH] x86: Set FSGSBASE to active if enabled by kernel
Date: Wed, 15 Mar 2023 17:42:40 -0700 [thread overview]
Message-ID: <CAMe9rOo4hYnZfkK8n1VYPVVAqeX1=CHt423K=1gYaTT+fhZisA@mail.gmail.com> (raw)
In-Reply-To: <87zg8grcjf.fsf@oldenburg.str.redhat.com>
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.
prev parent reply other threads:[~2023-03-16 0:43 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-09 18:26 H.J. Lu
2023-03-13 13:44 ` Florian Weimer
2023-03-16 0:42 ` H.J. Lu [this message]
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