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Re: [PATCH v3 1/4] x86/shadow: replace sh_reset_l3_up_pointers()
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 9 Feb 2023 17:28:34 +0000
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- Cc: Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 08/02/2023 2:37 pm, 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()
> and sh_next_page()). Furthermore sh_terminate_list() is a safe guard
> only anyway, which isn't in use in the common case (it actually does
> something only for BIGMEM configurations).
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
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