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Re: [PATCH v3 07/12] xen: introduce domain-layout.h with common domain_use_host_layout()
- To: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 21 Apr 2026 11:20:09 +0200
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- Cc: Romain Caritey <Romain.Caritey@xxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 21 Apr 2026 09:20:19 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 10.04.2026 17:54, Oleksii Kurochko wrote:
> --- /dev/null
> +++ b/xen/include/xen/domain-layout.h
> @@ -0,0 +1,28 @@
> +#ifndef __XEN_DOMAIN_LAYOUT_H__
> +#define __XEN_DOMAIN_LAYOUT_H__
> +
> +#include <xen/domain.h>
> +#include <xen/paging.h>
> +#include <xen/sched.h>
> +
> +/*
> + * Is a domain using the host memory layout?
> + *
> + * domain_use_host_layout() is always False for PV guests.
> + *
> + * Direct-mapped domains (autotranslated domains with memory allocated
> + * contiguously and mapped 1:1 so that GFN == MFN) are always using the
> + * host memory layout to avoid address clashes.
What is "to avoid address clashes" about? If GFN == MFN, how could there
be clashes?
> + * The hardware domain will use the host layout (regardless of
> + * direct-mapped) because some OS may rely on specific address ranges
> + * for the devices. PV Dom0, like any other PV guests, has
> + * domain_use_host_layout() returning False.
This last sentence is somewhat redundant and somewhat in conflict with
what is said further up. If you did s/guests/domains (including Dom0)/
there, imo this sentence would best be dropped from down here.
With these adjustments:
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Jan
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