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Re: [PATCH v10 05/11] common/domain: add a domain context record for shared_info...
- To: Paul Durrant <paul@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 25 Jan 2021 19:11:01 +0000
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- Cc: Paul Durrant <pdurrant@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Ian Jackson <iwj@xxxxxxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 08/10/2020 19:57, Paul Durrant wrote:
> diff --git a/xen/include/public/save.h b/xen/include/public/save.h
> index c4be9f570c..bccbaadd0b 100644
> --- a/xen/include/public/save.h
> +++ b/xen/include/public/save.h
> @@ -58,6 +59,16 @@ struct domain_context_start {
> uint32_t xen_major, xen_minor;
> };
>
> +struct domain_context_shared_info {
> + uint32_t flags;
> +
> +#define _DOMAIN_CONTEXT_32BIT_SHARED_INFO 0
> +#define DOMAIN_CONTEXT_32BIT_SHARED_INFO \
> + (1U << _DOMAIN_CONTEXT_32BIT_SHARED_INFO)
There is no need for the logarithm version of this constant.
You do however want an explicit uint32_t _rsvd; so buffer[] doesn't
start at the wrong alignment for an efficient memcpy() in 64bit builds
of Xen.
~Andrew
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