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Re: [Xen-devel] [PATCH v5 2/3] x86: Remap GDT tables in the Fixmap section
- To: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
- From: Thomas Garnier <thgarnie@xxxxxxxxxx>
- Date: Mon, 13 Mar 2017 12:24:21 -0700
- Cc: Michal Hocko <mhocko@xxxxxxxx>, Stanislaw Gruszka <sgruszka@xxxxxxxxxx>, kvm list <kvm@xxxxxxxxxxxxxxx>, "linux-doc@xxxxxxxxxxxxxxx" <linux-doc@xxxxxxxxxxxxxxx>, Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>, Frederic Weisbecker <fweisbec@xxxxxxxxx>, X86 ML <x86@xxxxxxxxxx>, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxx>, "linux-efi@xxxxxxxxxxxxxxx" <linux-efi@xxxxxxxxxxxxxxx>, Alexander Potapenko <glider@xxxxxxxxxx>, Pavel Machek <pavel@xxxxxx>, "H . Peter Anvin" <hpa@xxxxxxxxx>, "kernel-hardening@xxxxxxxxxxxxxxxxxx" <kernel-hardening@xxxxxxxxxxxxxxxxxx>, Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>, Jiri Olsa <jolsa@xxxxxxxxxx>, zijun_hu <zijun_hu@xxxxxxx>, Prarit Bhargava <prarit@xxxxxxxxxx>, Andi Kleen <ak@xxxxxxxxxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Michael Ellerman <mpe@xxxxxxxxxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>, Radim Krčmář <rkrcmar@xxxxxxxxxx>, Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx>, kasan-dev <kasan-dev@xxxxxxxxxxxxxxxx>, Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>, Christian Borntraeger <borntraeger@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Borislav Petkov <bp@xxxxxxx>, Len Brown <len.brown@xxxxxxxxx>, Rusty Russell <rusty@xxxxxxxxxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, He Chen <he.chen@xxxxxxxxxxxxxxx>, Brian Gerst <brgerst@xxxxxxxxx>, Jiri Kosina <jikos@xxxxxxxxxx>, lguest@xxxxxxxxxxxxxxxx, Andy Lutomirski <luto@xxxxxxxxxx>, Josh Poimboeuf <jpoimboe@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Dmitry Vyukov <dvyukov@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Lorenzo Stoakes <lstoakes@xxxxxxxxx>, "linux-mm@xxxxxxxxx" <linux-mm@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, "linux-pm@xxxxxxxxxxxxxxx" <linux-pm@xxxxxxxxxxxxxxx>, Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>, "Rafael J . Wysocki" <rjw@xxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, Fenghua Yu <fenghua.yu@xxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxxxxxx>, "Luis R . Rodriguez" <mcgrof@xxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>, Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
- Delivery-date: Mon, 13 Mar 2017 19:24:38 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
On Mon, Mar 13, 2017 at 11:32 AM, Boris Ostrovsky
<boris.ostrovsky@xxxxxxxxxx> wrote:
> There are a couple of problems for Xen PV guests that need to be addressed:
> 1. Xen's set_fixmap op needs non-default handling for
> FIX_GDT_REMAP_BEGIN range
> 2. GDT remapping for PV guests needs to be RO for both 64 and 32-bit guests.
>
> I don't know how you prefer to deal with (2), patch below is one
> suggestion. With it all my boot tests (Xen and bare-metal) passed.
>
Good suggestion, I think I will use most of it. Thanks!
> One problem with applying it directly is that kernel becomes
> not-bisectable (Xen-wise) between patches 2 and 3 so perhaps you might
> pull some of the changes from patch 3 to patch 2.
>
Yes that make sense, I will have to add the global variable on patch 2
and rebase 3 correctly.
--
Thomas
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