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Re: [PATCH v3 06/20] xen/riscv: add root page table allocation
- To: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 5 Aug 2025 12:43:05 +0200
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- Cc: Alistair Francis <alistair.francis@xxxxxxx>, Bob Eshleman <bobbyeshleman@xxxxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 05 Aug 2025 10:43:14 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 31.07.2025 17:58, Oleksii Kurochko wrote:
> +static int p2m_alloc_root_table(struct p2m_domain *p2m)
> +{
> + struct domain *d = p2m->domain;
> + struct page_info *page;
> + const unsigned int nr_root_pages = P2M_ROOT_PAGES;
> +
> + /*
> + * Return back nr_root_pages to assure the root table memory is also
> + * accounted against the P2M pool of the domain.
> + */
> + if ( !paging_ret_pages_to_domheap(d, nr_root_pages) )
> + return -ENOMEM;
> +
> + page = p2m_allocate_root(d);
> + if ( !page )
> + return -ENOMEM;
> +
> + p2m->root = page;
> +
> + return 0;
> +}
In the success case, shouldn't you bump the paging pool's total_pages by
P2M_ROOT_PAGES? (As the freeing side is missing so far, it's not easy to
tell whether there's [going to be] a balancing problem in the long run.
In the short run there certainly is.)
Jan
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