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Re: [PATCH for-4.18 v5] xen/pdx: Make CONFIG_PDX_COMPRESSION a common Kconfig option
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Fri, 6 Oct 2023 17:18:06 +0200
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- Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Alejandro Vallejo <alejandro.vallejo@xxxxxxxxx>, Julien Grall <jgrall@xxxxxxxxxx>, Shawn Anastasio <sanastasio@xxxxxxxxxxxxxxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>, Henry Wang <Henry.Wang@xxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Julien Grall <julien@xxxxxxx>
- Delivery-date: Fri, 06 Oct 2023 15:18:28 +0000
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On Fri, Oct 06, 2023 at 03:44:05PM +0100, Andrew Cooper wrote:
> From: Alejandro Vallejo <alejandro.vallejo@xxxxxxxxx>
>
> Adds a new compile-time flag to allow disabling PDX compression and
> compiles out compression-related code/data. It also shorts the pdx<->pfn
> conversion macros and creates stubs for masking functions.
>
> While at it, removes the old arch-defined CONFIG_HAS_PDX flag. Despite the
> illusion of choice, it was not optional.
>
> There are ARM and PPC platforms with sparse RAM banks - leave compression
> active by default there. OTOH, there are no known production x86 systems with
> sparse RAM banks, so disable compression. This decision can be revisited if
> such a platform comes along.
>
> Signed-off-by: Alejandro Vallejo <alejandro.vallejo@xxxxxxxxx>
> Reviewed-by: Julien Grall <jgrall@xxxxxxxxxx>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Thanks, Roger.
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