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Re: [PATCH v2 1/9] x86/shadow: replace sh_reset_l3_up_pointers()
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 17 Jan 2023 11:10:25 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>
- Delivery-date: Tue, 17 Jan 2023 10:10:34 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11.01.2023 14:52, Jan Beulich wrote:
> Rather than doing a separate hash walk (and then even using the vCPU
> variant, which is to go away), do the up-pointer-clearing right in
> sh_unpin(), as an alternative to the (now further limited) enlisting on
> a "free floating" list fragment. This utilizes the fact that such list
> fragments are traversed only for multi-page shadows (in shadow_free()).
I've added mention of sh_next_page() here as well. Not sure how I
managed to miss that, but this doesn't change the reasoning.
Jan
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