linux-kernel - Re: [RFC PTI 1/3] x86/pti: Vastly simplify pgd synchronization

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Message-ID: <87386e3b-f5a5-2481-9611-ce993314347a@intel.com>
Date:   Fri, 8 Dec 2017 12:48:25 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     X86 ML <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Borislav Petkov <bp@...en8.de>,
        Brian Gerst <brgerst@...il.com>,
        David Laight <David.Laight@...lab.com>,
        Kees Cook <keescook@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [RFC PTI 1/3] x86/pti: Vastly simplify pgd synchronization

On 12/08/2017 12:49 PM, Andy Lutomirski wrote:
>> if ((pgd.pgd & (_PAGE_USER|_PAGE_PRESENT)) &&
>>     (__supported_pte_mask & _PAGE_NX))
> I assume you mean pgd.pgd & (_PAGE_USER|_PAGE_PRESENT) ==
> (_PAGE_USER|_PAGE_PRESENT)?

Yeah.