linux-kernel - Re: Re: [PATCH] RISC-V: mm: Fix set_satp

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Date:   Fri, 15 Apr 2022 13:10:36 +0800 (GMT+08:00)
From:   潘庆霖 <panqinglin2020@...as.ac.cn>
To:     "Anup Patel" <apatel@...tanamicro.com>
Cc:     "Palmer Dabbelt" <palmer@...belt.com>,
        "Paul Walmsley" <paul.walmsley@...ive.com>,
        "Alexandre Ghiti" <alexandre.ghiti@...onical.com>,
        "Atish Patra" <atishp@...shpatra.org>,
        "Alistair Francis" <Alistair.Francis@....com>,
        "Anup Patel" <anup@...infault.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        "Mayuresh Chitale" <mchitale@...tanamicro.com>
Subject: Re: Re: [PATCH] RISC-V: mm: Fix set_satp_mode() for platform not
 having Sv57

Hi Anup,

&gt; 
&gt; We can't assume that it will be the same pgd_index for Sv48 and Sv57.
&gt; 
&gt; For example, some hypothetical SoC might have RAM starting after 1TB space.
&gt; 
&gt; We should ensure that early_pg_dir is cleaned entirely for detecting the next
&gt; mode.
&gt; 

Got it. Your idea is really more stable. Thank you for pointing out that!

Yours,
Qinglin