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Re: [PATCH v4 07/44] x86/boot: move headroom to boot modules


  • To: "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Wed, 4 Sep 2024 00:40:55 +0100
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  • Cc: jason.andryuk@xxxxxxx, christopher.w.clark@xxxxxxxxx, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
  • Delivery-date: Tue, 03 Sep 2024 23:41:06 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 30/08/2024 10:46 pm, Daniel P. Smith wrote:
> diff --git a/xen/arch/x86/include/asm/bootinfo.h 
> b/xen/arch/x86/include/asm/bootinfo.h
> index 844262495962..3e0e36df096b 100644
> --- a/xen/arch/x86/include/asm/bootinfo.h
> +++ b/xen/arch/x86/include/asm/bootinfo.h
> @@ -13,6 +13,7 @@
>  
>  struct boot_module {
>      module_t *early_mod;
> +    unsigned long headroom;

This needs a comment explaining what it's for.  Perhaps crib from ...

> diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
> index 8912956ee7f1..fd6cc7fac907 100644
> --- a/xen/arch/x86/setup.c
> +++ b/xen/arch/x86/setup.c
> @@ -1475,8 +1477,10 @@ void asmlinkage __init noreturn __start_xen(unsigned 
> long mbi_p)
>               * decompressor overheads of mod[0] (the dom0 kernel).  When we
>               * move mod[0], we incorporate this as extra space at the start.
>               */

... here, while also editing to to prevent it going stale.

It is this patch which stops modules_headroom being strictly the dom0
kernel.

~Andrew



 


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