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Re: [PATCH v2 02/15] x86/boot: introduce domid field to struct boot_domain


  • To: "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>
  • From: Jan Beulich <jbeulich@xxxxxxxx>
  • Date: Thu, 30 Jan 2025 14:51:45 +0100
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  • Cc: jason.andryuk@xxxxxxx, christopher.w.clark@xxxxxxxxx, stefano.stabellini@xxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
  • Delivery-date: Thu, 30 Jan 2025 13:51:53 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 26.12.2024 17:57, Daniel P. Smith wrote:
> Add a domid field to struct boot_domain to hold the assigned domain id for the
> domain. During initialization, ensure all instances of struct boot_domain have
> the invalid domid to ensure that the domid must be set either by convention or
> configuration.

I'm still missing justification for the duplication between the struct domain *
that's already in struct boot_domain and this new member. Iirc you responded to
this earlier question of mine, but nothing was put here.

> --- a/xen/arch/x86/setup.c
> +++ b/xen/arch/x86/setup.c
> @@ -292,6 +292,7 @@ static const char *cmdline_cook(const char *p, const char 
> *loader_name);
>  struct boot_info __initdata xen_boot_info = {
>      .loader = "unknown",
>      .cmdline = "",
> +    .domains = { {.domid = DOMID_INVALID} },

Please can you fully use designated initializers here, thus also protecting
against MAX_NR_BOOTDOMS increasing without and update being done here (and
the compiler still being happy)?

    .domains = { [0 ... MAX_NR_BOOTDOMS - 1] = { .domid = DOMID_INVALID } },

Nit: Note also the blanks I added.

Jan



 


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