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Date:   Fri, 5 Feb 2021 16:49:05 +0100
From:   Peter Zijlstra <peterz@infradead.org>
To:     "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc:     Dave Hansen <dave.hansen@linux.intel.com>,
        Andy Lutomirski <luto@kernel.org>, x86@kernel.org,
        Andrey Ryabinin <aryabinin@virtuozzo.com>,
        Alexander Potapenko <glider@google.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        "H . J . Lu" <hjl.tools@gmail.com>,
        Andi Kleen <ak@linux.intel.com>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
Subject: Re: [RFC 0/9] Linear Address Masking enabling
Message-ID: <YB1o8RZnaaf7xXAQ@hirez.programming.kicks-ass.net>
References: <20210205151631.43511-1-kirill.shutemov@linux.intel.com>
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On Fri, Feb 05, 2021 at 06:16:20PM +0300, Kirill A. Shutemov wrote:
> The feature competes for bits with 5-level paging: LAM_U48 makes it
> impossible to map anything about 47-bits. The patchset made these
> capability mutually exclusive: whatever used first wins. LAM_U57 can be
> combined with mappings above 47-bits.

And I suppose we still can't switch between 4 and 5 level at runtime,
using a CR3 bit?