linux-kernel - Re: [PATCH v2] iscsi_ibft: Fix finding the iBFT under Xen Dom 0

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Message-ID: <b6c4347d-bd03-0332-c4a9-9d2a11f17a6a@intel.com>
Date:   Thu, 1 Jun 2023 10:08:41 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Ross Lagerwall <ross.lagerwall@...rix.com>,
        linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org
Cc:     Jan Beulich <jbeulich@...e.com>,
        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>
Subject: Re: [PATCH v2] iscsi_ibft: Fix finding the iBFT under Xen Dom 0

On 6/1/23 09:57, Dave Hansen wrote:
> On 5/30/23 08:01, Ross Lagerwall wrote:
>> Since firmware doesn't indicate the iBFT in the E820, add a reserved
>> region so that it gets identity mapped when running as Dom 0 so that it
>> is possible to search for it. Move the call to reserve_ibft_region()
>> later so that it is called after the Xen identity mapping adjustments
>> are applied.

Oh, and one more thing:

What is the end user visible effect of this problem and of your solution?

Do Xen Dom 0 systems fail to find their boot iSCSI volume and refuse to
boot?  I take it after this patch that they can boot again.