linux-kernel - Re: [PATCH] iscsi_ibft: Fix finding the iBFT under Xen Dom 0

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Date:   Thu, 25 May 2023 11:31:23 +0200
From:   Jan Beulich <jbeulich@...e.com>
To:     Ross Lagerwall <ross.lagerwall@...rix.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Peter Jones <pjones@...hat.com>,
        Konrad Rzeszutek Wilk <konrad@...nel.org>,
        linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org
Subject: Re: [PATCH] iscsi_ibft: Fix finding the iBFT under Xen Dom 0

On 24.05.2023 18:05, Ross Lagerwall wrote:
> --- a/arch/x86/xen/setup.c
> +++ b/arch/x86/xen/setup.c
> @@ -772,8 +772,14 @@ char * __init xen_memory_setup(void)
>  	 * UNUSABLE regions in domUs are not handled and will need
>  	 * a patch in the future.
>  	 */

I think this comment now wants to move ...

> -	if (xen_initial_domain())
> +	if (xen_initial_domain()) {

... here. And then likely you want a blank line ...

>  		xen_ignore_unusable();

... here.

> +		/* Reserve 0.5 MiB to 1 MiB region so iBFT can be found */
> +		xen_e820_table.entries[xen_e820_table.nr_entries].addr = 0x80000;
> +		xen_e820_table.entries[xen_e820_table.nr_entries].size = 0x80000;
> +		xen_e820_table.entries[xen_e820_table.nr_entries].type = E820_TYPE_RESERVED;
> +		xen_e820_table.nr_entries++;

Surely this can be omitted when !CONFIG_ISCSI_IBFT_FIND?

Jan