From: Borislav Petkov <bp@alien8.de>
To: Jacob Keller <jacob.e.keller@intel.com>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
linux-kernel@vger.kernel.org,
Dave Hansen <dave.hansen@linux.intel.com>
Subject: Re: [PATCH] x86/pkeys: Manually set X86_FEATURE_OSPKE to preserve existing changes
Date: Thu, 27 Feb 2020 19:01:00 +0100 [thread overview]
Message-ID: <20200227180100.GB18629@zn.tnic> (raw)
In-Reply-To: <a492b4f4-4a54-5e5a-b79f-e21f9038f259@intel.com>
On Wed, Feb 26, 2020 at 04:16:13PM -0800, Jacob Keller wrote:
> I tested this and it resolves my report! Thanks for a timely fix.
Adding your Tested-by.
> I agree with the analysis. Perhaps it would make sense in the long term
> to find a solution where get_cpu_cap can remember what was cleared for
> each CPU and restore those? It already does this using the global
> variables...
get_cpu_cap() remembers if you use setup_force_cpu_cap() but I agree
that that whole feature bit handling is a bit, hm, "strange". It had its
raisins.
FWIW, we had started cleaning those up but then the security nightmares
happened so on the backburner it went...
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2020-02-27 18:01 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-26 23:16 Sean Christopherson
2020-02-26 23:32 ` Dave Hansen
2020-02-26 23:40 ` Jacob Keller
2020-02-27 0:16 ` Jacob Keller
2020-02-27 18:01 ` Borislav Petkov [this message]
2020-02-27 18:20 ` Jacob Keller
2020-02-27 18:07 ` [tip: x86/urgent] " tip-bot2 for Sean Christopherson
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