From: "H. Peter Anvin" <hpa@zytor.com>
To: Henrique de Moraes Holschuh <hmh@hmh.eng.br>,
Toshi Kani <toshi.kani@hp.com>
Cc: tglx@linutronix.de, mingo@redhat.com, akpm@linuxfoundation.org,
arnd@arndb.de, linux-mm@kvack.org, linux-kernel@vger.kernel.org,
jgross@suse.com, stefan.bader@canonical.com, luto@amacapital.net,
konrad.wilk@oracle.com
Subject: Re: [PATCH 1/5] x86, mm, pat: Set WT to PA4 slot of PAT MSR
Date: Thu, 04 Sep 2014 13:21:24 -0700 [thread overview]
Message-ID: <5408C9C4.1010705@zytor.com> (raw)
In-Reply-To: <20140904201123.GA9116@khazad-dum.debian.net>
On 09/04/2014 01:11 PM, Henrique de Moraes Holschuh wrote:
>
> I am worried of uncharted territory, here. I'd actually advocate for not
> enabling the upper four PAT entries on IA-32 at all, unless Windows 9X / XP
> is using them as well. Is this a real concern, or am I being overly
> cautious?
>
It is extremely unlikely that we'd have PAT issues in 32-bit mode and
not in 64-bit mode on the same CPU.
As far as I know, the current blacklist rule is very conservative due to
lack of testing more than anything else.
-hpa
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WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@zytor.com>
To: Henrique de Moraes Holschuh <hmh@hmh.eng.br>,
Toshi Kani <toshi.kani@hp.com>
Cc: tglx@linutronix.de, mingo@redhat.com, akpm@linuxfoundation.org,
arnd@arndb.de, linux-mm@kvack.org, linux-kernel@vger.kernel.org,
jgross@suse.com, stefan.bader@canonical.com, luto@amacapital.net,
konrad.wilk@oracle.com
Subject: Re: [PATCH 1/5] x86, mm, pat: Set WT to PA4 slot of PAT MSR
Date: Thu, 04 Sep 2014 13:21:24 -0700 [thread overview]
Message-ID: <5408C9C4.1010705@zytor.com> (raw)
In-Reply-To: <20140904201123.GA9116@khazad-dum.debian.net>
On 09/04/2014 01:11 PM, Henrique de Moraes Holschuh wrote:
>
> I am worried of uncharted territory, here. I'd actually advocate for not
> enabling the upper four PAT entries on IA-32 at all, unless Windows 9X / XP
> is using them as well. Is this a real concern, or am I being overly
> cautious?
>
It is extremely unlikely that we'd have PAT issues in 32-bit mode and
not in 64-bit mode on the same CPU.
As far as I know, the current blacklist rule is very conservative due to
lack of testing more than anything else.
-hpa
next prev parent reply other threads:[~2014-09-04 20:21 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-04 18:35 [PATCH 0/5] Support Write-Through mapping on x86 Toshi Kani
2014-09-04 18:35 ` Toshi Kani
2014-09-04 18:35 ` [PATCH 1/5] x86, mm, pat: Set WT to PA4 slot of PAT MSR Toshi Kani
2014-09-04 18:35 ` Toshi Kani
2014-09-04 20:11 ` Henrique de Moraes Holschuh
2014-09-04 20:11 ` Henrique de Moraes Holschuh
2014-09-04 20:21 ` H. Peter Anvin [this message]
2014-09-04 20:21 ` H. Peter Anvin
2014-09-04 23:19 ` Henrique de Moraes Holschuh
2014-09-04 23:19 ` Henrique de Moraes Holschuh
2014-09-04 23:34 ` Andy Lutomirski
2014-09-04 23:34 ` Andy Lutomirski
2014-09-05 0:29 ` Toshi Kani
2014-09-05 0:29 ` Toshi Kani
2014-09-05 0:51 ` Andy Lutomirski
2014-09-05 0:51 ` Andy Lutomirski
2014-09-05 14:00 ` Toshi Kani
2014-09-05 14:00 ` Toshi Kani
2014-09-05 15:07 ` H. Peter Anvin
2014-09-05 15:07 ` H. Peter Anvin
2014-09-05 15:22 ` Toshi Kani
2014-09-05 15:22 ` Toshi Kani
2014-09-05 15:41 ` H. Peter Anvin
2014-09-05 15:41 ` H. Peter Anvin
2014-09-05 15:42 ` Toshi Kani
2014-09-05 15:42 ` Toshi Kani
2014-09-12 19:25 ` Konrad Rzeszutek Wilk
2014-09-12 19:25 ` Konrad Rzeszutek Wilk
2014-09-12 20:03 ` Andy Lutomirski
2014-09-12 20:03 ` Andy Lutomirski
2014-09-12 20:21 ` Konrad Rzeszutek Wilk
2014-09-12 20:21 ` Konrad Rzeszutek Wilk
2014-09-04 20:31 ` Toshi Kani
2014-09-04 20:31 ` Toshi Kani
2014-09-04 20:50 ` Andy Lutomirski
2014-09-04 20:50 ` Andy Lutomirski
2014-09-04 23:27 ` Toshi Kani
2014-09-04 23:27 ` Toshi Kani
2014-09-05 10:23 ` Ingo Molnar
2014-09-05 10:23 ` Ingo Molnar
2014-09-05 13:50 ` Toshi Kani
2014-09-05 13:50 ` Toshi Kani
2014-09-07 13:58 ` Henrique de Moraes Holschuh
2014-09-07 13:58 ` Henrique de Moraes Holschuh
2014-09-04 18:35 ` [PATCH 2/5] x86, mm, pat: Change reserve_memtype() to handle WT Toshi Kani
2014-09-04 18:35 ` Toshi Kani
2014-09-04 18:35 ` [PATCH 3/5] x86, mm, asm-gen: Add ioremap_wt() for WT Toshi Kani
2014-09-04 18:35 ` Toshi Kani
2014-09-04 18:35 ` [PATCH 4/5] x86, mm: Add set_memory_wt() " Toshi Kani
2014-09-04 18:35 ` Toshi Kani
2014-09-04 18:57 ` Andy Lutomirski
2014-09-04 18:57 ` Andy Lutomirski
2014-09-04 18:57 ` Toshi Kani
2014-09-04 18:57 ` Toshi Kani
2014-09-04 19:14 ` Andy Lutomirski
2014-09-04 19:14 ` Andy Lutomirski
2014-09-04 19:30 ` Toshi Kani
2014-09-07 8:49 ` Yigal Korman
2014-09-07 8:49 ` Yigal Korman
2014-09-07 16:49 ` Andy Lutomirski
2014-09-07 16:49 ` Andy Lutomirski
2014-09-08 15:07 ` Toshi Kani
2014-09-08 15:07 ` Toshi Kani
2014-09-08 17:23 ` Andy Lutomirski
2014-09-08 17:23 ` Andy Lutomirski
2014-09-08 18:42 ` Toshi Kani
2014-09-08 18:42 ` Toshi Kani
2014-09-04 18:35 ` [PATCH 5/5] x86, mm, pat: Add pgprot_writethrough() " Toshi Kani
2014-09-04 18:35 ` Toshi Kani
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