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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Mon, 16 Apr 2018 08:32:46 -0700
Message-ID: <CA+55aFwGTOgSonVquab63PZG5z_NfgVF2A08iHaNeeqY5pdfnA@mail.gmail.com>
Subject: Re: [PATCH 00/35 v5] PTI support for x32
To:     Joerg Roedel <joro@8bytes.org>
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@kernel.org>,
        "H . Peter Anvin" <hpa@zytor.com>,
        "the arch/x86 maintainers" <x86@kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-mm <linux-mm@kvack.org>, Andy Lutomirski <luto@kernel.org>,
        Dave Hansen <dave.hansen@intel.com>,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        Juergen Gross <jgross@suse.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Borislav Petkov <bp@alien8.de>, Jiri Kosina <jkosina@suse.cz>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Brian Gerst <brgerst@gmail.com>,
        David Laight <David.Laight@aculab.com>,
        Denys Vlasenko <dvlasenk@redhat.com>,
        Eduardo Valentin <eduval@amazon.com>,
        Greg KH <gregkh@linuxfoundation.org>,
        Will Deacon <will.deacon@arm.com>,
        "Liguori, Anthony" <aliguori@amazon.com>,
        Daniel Gruss <daniel.gruss@iaik.tugraz.at>,
        Hugh Dickins <hughd@google.com>,
        Kees Cook <keescook@google.com>,
        Andrea Arcangeli <aarcange@redhat.com>,
        Waiman Long <llong@redhat.com>, Pavel Machek <pavel@ucw.cz>,
        "David H . Gutteridge" <dhgutteridge@sympatico.ca>,
        Joerg Roedel <jroedel@suse.de>
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On Mon, Apr 16, 2018 at 8:24 AM, Joerg Roedel <joro@8bytes.org> wrote:
>
> I tested this version again with my load-test of running
> perf-top/various x86-selftests/kernel-compile in a loop for
> a couple of hours. This showed no issues. I also briefly
> tested a 64bit kernel and this also worked as expected.

Andy, can you send your extra x86 self-tests to Joerg too?

Also, it would be nice to have performance numbers, and check that the
global page issues are at least fixed on 32-bit too, since we screwed
that up on x86-64 initially.

On x86-32, the global pages are likely a bigger deal since there's no PCID.

                  Linus