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Re: [PATCH v2 1/4] x86/mm: introduce helpers to detect super page alignment
- To: Roger Pau Monne <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 11 Nov 2024 09:50:32 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 11 Nov 2024 08:50:51 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 08.11.2024 12:31, Roger Pau Monne wrote:
> Split the code that detects whether the physical and linear address of a
> mapping request are suitable to be used in an L3 or L2 slot.
>
> No functional change intended.
>
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
with one further tweak:
> --- a/xen/arch/x86/mm.c
> +++ b/xen/arch/x86/mm.c
> @@ -5232,6 +5232,12 @@ int map_pages_to_xen(
> } \
> } while (0)
>
> +/* Check if a (virt, mfn) tuple is aligned for a given slot level. */
> +#define IS_LnE_ALIGNED(v, m, n) \
> + IS_ALIGNED(PFN_DOWN(v) | mfn_x(m), (1UL << (PAGETABLE_ORDER * (n - 1)))
> - 1)
n wants parenthesizing here, for Misra's sake. I'll take the liberty to do so
while committing.
Jan
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