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Re: [Qemu-devel] [PATCH v3 10/20] kvm: arm64: Dynamic configuration of V

From: Suzuki K Poulose
Subject: Re: [Qemu-devel] [PATCH v3 10/20] kvm: arm64: Dynamic configuration of VTTBR mask
Date: Wed, 4 Jul 2018 09:29:06 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0

On 07/04/2018 09:24 AM, Auger Eric wrote:
+ *
+ * We have a magic formula for the Magic_N below.
+ *
+ *  Magic_N(PAGE_SIZE, Entry_Level) = 64 - ((PAGE_SHIFT - 3) *
Number of levels)

[0] ^^^

+ *
+ * where number of levels = (4 - Entry_Level).

^^^ Doesn't this help make it clear ? Using the expansion makes it a bit
unreadable below.

I just wanted to mention the tables you refer (D4-23 and D4-25) give
Magic_N for a larger scope as they deal with any lookup level while we
only care about the entry level for BADDR. So I was a little bit
confused when reading the explanation but that's not a big deal.

Ah, ok. I will try to clarify it.


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