Re: [PATCH v2 0/4] x86, mm: Handle large PAT bit in pud/pmd interfaces

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From: Ingo Molnar <mingo@kernel.org>
To: Toshi Kani <toshi.kani@hp.com>
Cc: hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com,
	akpm@linux-foundation.org, bp@alien8.de, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org, x86@kernel.org, jgross@suse.com,
	konrad.wilk@oracle.com, elliott@hp.com
Subject: Re: [PATCH v2 0/4] x86, mm: Handle large PAT bit in pud/pmd interfaces
Date: Tue, 21 Jul 2015 10:05:44 +0200	[thread overview]
Message-ID: <20150721080544.GA28118@gmail.com> (raw)
In-Reply-To: <1436977435-31826-1-git-send-email-toshi.kani@hp.com>


* Toshi Kani <toshi.kani@hp.com> wrote:

> The PAT bit gets relocated to bit 12 when PUD and PMD mappings are used.
> This bit 12, however, is not covered by PTE_FLAGS_MASK, which is corrently
> used for masking pfn and flags for all cases.
> 
> Patch 1/4-2/4 make changes necessary for patch 3/4 to use P?D_PAGE_MASK.
> 
> Patch 3/4 fixes pud/pmd interfaces to handle the PAT bit when PUD and PMD
> mappings are used.
> 
> Patch 3/4 fixes /sys/kernel/debug/kernel_page_tables to show the PAT bit
> properly.
> 
> Note, the PAT bit is first enabled in 4.2-rc1 with WT mappings.

Are patches 1-3 only needed to fix /sys/kernel/debug/kernel_page_tables output, or 
are there other things fixed as well? The patches do not tell us any of that 
information ...

Thanks,

	Ingo

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WARNING: multiple messages have this Message-ID (diff)

From: Ingo Molnar <mingo@kernel.org>
To: Toshi Kani <toshi.kani@hp.com>
Cc: hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com,
	akpm@linux-foundation.org, bp@alien8.de, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org, x86@kernel.org, jgross@suse.com,
	konrad.wilk@oracle.com, elliott@hp.com
Subject: Re: [PATCH v2 0/4] x86, mm: Handle large PAT bit in pud/pmd interfaces
Date: Tue, 21 Jul 2015 10:05:44 +0200	[thread overview]
Message-ID: <20150721080544.GA28118@gmail.com> (raw)
In-Reply-To: <1436977435-31826-1-git-send-email-toshi.kani@hp.com>


* Toshi Kani <toshi.kani@hp.com> wrote:

> The PAT bit gets relocated to bit 12 when PUD and PMD mappings are used.
> This bit 12, however, is not covered by PTE_FLAGS_MASK, which is corrently
> used for masking pfn and flags for all cases.
> 
> Patch 1/4-2/4 make changes necessary for patch 3/4 to use P?D_PAGE_MASK.
> 
> Patch 3/4 fixes pud/pmd interfaces to handle the PAT bit when PUD and PMD
> mappings are used.
> 
> Patch 3/4 fixes /sys/kernel/debug/kernel_page_tables to show the PAT bit
> properly.
> 
> Note, the PAT bit is first enabled in 4.2-rc1 with WT mappings.

Are patches 1-3 only needed to fix /sys/kernel/debug/kernel_page_tables output, or 
are there other things fixed as well? The patches do not tell us any of that 
information ...

Thanks,

	Ingo

next prev parent reply	other threads:[~2015-07-21  8:05 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-07-15 16:23 [PATCH v2 0/4] x86, mm: Handle large PAT bit in pud/pmd interfaces Toshi Kani
2015-07-15 16:23 ` Toshi Kani
2015-07-15 16:23 ` [PATCH v2 1/4] x86/vdso32: Define PGTABLE_LEVELS to 32bit VDSO Toshi Kani
2015-07-15 16:23   ` Toshi Kani
2015-07-15 16:23 ` [PATCH v2 2/4] x86, asm: Move PUD_PAGE macros to page_types.h Toshi Kani
2015-07-15 16:23   ` Toshi Kani
2015-07-15 16:23 ` [PATCH v2 3/4] x86: Fix pud/pmd interfaces to handle large PAT bit Toshi Kani
2015-07-15 16:23   ` Toshi Kani
2015-07-15 16:23 ` [PATCH v2 4/4] x86, mm: Fix page table dump to show " Toshi Kani
2015-07-15 16:23   ` Toshi Kani
2015-07-21  8:05 ` Ingo Molnar [this message]
2015-07-21  8:05   ` [PATCH v2 0/4] x86, mm: Handle large PAT bit in pud/pmd interfaces Ingo Molnar
2015-07-21 14:52   ` Toshi Kani
2015-07-21 14:52     ` Toshi Kani

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