linux-kernel - Re: [PATCH] efi: avoid error message when booting under Xen

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Date:   Fri, 10 Jul 2020 16:41:30 +0300
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Jürgen Groß <jgross@...e.com>
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        xen-devel@...ts.xenproject.org, linux-fbdev@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Peter Jones <pjones@...hat.com>,
        linux-efi <linux-efi@...r.kernel.org>
Subject: Re: [PATCH] efi: avoid error message when booting under Xen

On Fri, 10 Jul 2020 at 16:38, Jürgen Groß <jgross@...e.com> wrote:
>
> On 10.07.20 15:27, Ard Biesheuvel wrote:
> > On Fri, 10 Jul 2020 at 13:17, Bartlomiej Zolnierkiewicz
> > <b.zolnierkie@...sung.com> wrote:
> >>
> >>
> >> [ added EFI Maintainer & ML to Cc: ]
> >>
> >> Hi,
> >>
> >> On 7/9/20 11:17 AM, Jürgen Groß wrote:
> >>> On 28.06.20 10:50, Jürgen Groß wrote:
> >>>> Ping?
> >>>>
> >>>> On 10.06.20 16:10, Juergen Gross wrote:
> >>>>> efifb_probe() will issue an error message in case the kernel is booted
> >>>>> as Xen dom0 from UEFI as EFI_MEMMAP won't be set in this case. Avoid
> >>>>> that message by calling efi_mem_desc_lookup() only if EFI_PARAVIRT
> >>>>> isn't set.
> >>>>>
> >
> > Why not test for EFI_MEMMAP instead of EFI_BOOT?
>
> Honestly I'm not sure EFI_BOOT is always set in that case. If you tell
> me it is fine to just replace the test to check for EFI_MEMMAP I'm fine
> to modify my patch.
>


Yes please