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Date:   Wed, 16 Nov 2022 15:31:12 -0800
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Subject: Re: [PATCH v7 0/6] x86/fpu: Allow PKRU to be (once again) written by
 ptrace
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To:     Kyle Huey <me@kylehuey.com>,
        Dave Hansen <dave.hansen@linux.intel.com>
Cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Borislav Petkov <bp@alien8.de>, Ingo Molnar <mingo@redhat.com>,
        x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Andy Lutomirski <luto@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Sean Christopherson <seanjc@google.com>,
        linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
        Robert O'Callahan <robert@ocallahan.org>,
        David Manouchehri <david.manouchehri@riseup.net>
References: <20221115230932.7126-1-khuey@kylehuey.com>
From:   Dave Hansen <dave.hansen@intel.com>
In-Reply-To: <20221115230932.7126-1-khuey@kylehuey.com>
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On 11/15/22 15:09, Kyle Huey wrote:
> Following last week's discussion I've reorganized this patch. The goal
> remains to restore the pre-5.14 behavior of ptrace(PTRACE_SET_REGSET,
> NT_X86_XSTATE) for the PKRU register (which was equivalent to a hardware
> XRSTOR instruction).

The new version looks great.  I've applied it.

I did remove the stable@ tags for now.  There were a couple reasons for
that.  First, most of the x86 stuff marked for stable@ goes via our
tip/urgent branch and this doesn't seem super urgent.  It also touches
code that's exposed in at least three separate UABIs, so I want a bit
more soak time than x86/urgent normally provides.

I have zero objections if anyone wants to submit it to stable@ after it
hits Linus's tree.