From: Wei Yang <richard.weiyang@gmail.com>
To: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Wei Yang <richard.weiyang@gmail.com>,
tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
dave.hansen@linux.intel.com, x86@kernel.org,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@kernel.org>,
Steve Wahl <steve.wahl@hpe.com>
Subject: Re: [Patch v2] x86/head/64: remove redundant check on level2_kernel_pgt's _PAGE_PRESENT bit
Date: Thu, 23 May 2024 12:26:04 +0000 [thread overview]
Message-ID: <20240523122604.2owqxj7fmgudewzk@master> (raw)
In-Reply-To: <fej5k6ikc3biecm5xadxgwv2pflktpjmvrxjhzmhia4p5kipun@ny3swf6kcqwi>
Thanks for comment.
On Thu, May 23, 2024 at 01:33:28PM +0300, Kirill A . Shutemov wrote:
>On Thu, May 23, 2024 at 08:37:52AM +0000, Wei Yang wrote:
>> This patch tries to remove a redundant check on kernel code's PMD
>> _PAGE_PRESENT attribute before fix up.
>
>Tries? s/This patch tries to r/R/
Will use this one.
>
>> Current process looks like this:
>>
>> pmd in [0, _text)
>> unset _PAGE_PRESENT
>> pmd in [_text, _end]
>> if (_PAGE_PRESENT)
>> fix up delta
>> pmd in (_end, 512)
>> unset _PAGE_PRESENT
>>
>> Since we have compiled in _PAGE_PRESENT in this page table, it is not
>> necessary to check _PAGE_PRESENT again before fixing up delta
>
>level2_kernel_pgt compiled with _PAGE_PRESENT set. The check is
>redundant.
>
Will use this one, thanks
>
>--
> Kiryl Shutsemau / Kirill A. Shutemov
--
Wei Yang
Help you, Help me
prev parent reply other threads:[~2024-05-23 12:26 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-23 8:37 Wei Yang
2024-05-23 10:33 ` Kirill A . Shutemov
2024-05-23 12:26 ` Wei Yang [this message]
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