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Re: [PATCH 08/22] x86/mm: avoid passing a domain parameter to L4 init function
- To: Roger Pau Monne <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 14 Aug 2024 12:24:50 +0200
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- Cc: alejandro.vallejo@xxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 14 Aug 2024 10:25:04 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 26.07.2024 17:21, Roger Pau Monne wrote:
> @@ -1673,13 +1668,14 @@ void init_xen_l4_slots(l4_pgentry_t *l4t, mfn_t l4mfn,
> l4e_from_mfn(sl4mfn, __PAGE_HYPERVISOR_RW);
>
> /* Slot 260: Per-domain mappings. */
> - l4t[l4_table_offset(PERDOMAIN_VIRT_START)] =
> - l4e_from_page(d->arch.perdomain_l3_pg, __PAGE_HYPERVISOR_RW);
> + if ( perdomain_l3 )
> + l4t[l4_table_offset(PERDOMAIN_VIRT_START)] =
> + l4e_from_page(perdomain_l3, __PAGE_HYPERVISOR_RW);
>
> /* Slot 4: Per-domain mappings mirror. */
> BUILD_BUG_ON(IS_ENABLED(CONFIG_PV32) &&
> !l4_table_offset(PERDOMAIN_ALT_VIRT_START));
> - if ( !is_pv_64bit_domain(d) )
> + if ( perdomain_l3 && maybe_compat )
> l4t[l4_table_offset(PERDOMAIN_ALT_VIRT_START)] =
> l4t[l4_table_offset(PERDOMAIN_VIRT_START)];
I think it would be nice if the description could clarify why we need checks
of perdomain_l3 twice here. I assume going forward you want to be able to
pass in NULL. Therefore, if the conditionals are required, I think it would
make sense to have just one, enclosing both (related) writes.
Jan
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