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From: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
To: Huacai Chen <chenhc@lemote.com>
Cc: linux-mips@vger.kernel.org, Fuxin Zhang <zhangfx@lemote.com>,
	Zhangjin Wu <wuzhangjin@gmail.com>,
	Huacai Chen <chenhuacai@gmail.com>,
	Jiaxun Yang <jiaxun.yang@flygoat.com>,
	stable@vger.kernel.org, Pei Huang <huangpei@loongson.cn>
Subject: Re: [PATCH] MIPS/tlbex: Fix LDDIR usage in setup_pw() for Loongson-3
Date: Wed, 25 Mar 2020 18:30:43 +0100	[thread overview]
Message-ID: <20200325173043.GA17524@alpha.franken.de> (raw)
In-Reply-To: <1585107894-8803-1-git-send-email-chenhc@lemote.com>

On Wed, Mar 25, 2020 at 11:44:54AM +0800, Huacai Chen wrote:
> LDDIR/LDPTE is Loongson-3's acceleration for Page Table Walking. If BD
> (Base Directory, the 4th page directory) is not enabled, then GDOffset
> is biased by BadVAddr[63:62]. So, if GDOffset (aka. BadVAddr[47:36] for
> Loongson-3) is big enough, "0b11(BadVAddr[63:62])|BadVAddr[47:36]|...."
> can far beyond pg_swapper_dir. This means the pg_swapper_dir may NOT be
> accessed by LDDIR correctly, so fix it by set PWDirExt in CP0_PWCtl.
> 
> Cc: <stable@vger.kernel.org>
> Signed-off-by: Pei Huang <huangpei@loongson.cn>
> Signed-off-by: Huacai Chen <chenhc@lemote.com>
> ---
>  arch/mips/mm/tlbex.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)

applied to mips-next.

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]

  reply	other threads:[~2020-03-25 17:34 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-25  3:44 [PATCH] MIPS/tlbex: Fix LDDIR usage in setup_pw() for Loongson-3 Huacai Chen
2020-03-25 17:30 ` Thomas Bogendoerfer [this message]
2020-03-27 15:03 ` Sasha Levin
2020-03-28  2:22   ` Huacai Chen

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