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

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Date:   Thu, 9 Jul 2020 11:17:44 +0200
From:   Jürgen Groß <jgross@...e.com>
To:     xen-devel@...ts.xenproject.org, linux-fbdev@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     Peter Jones <pjones@...hat.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH] efi: avoid error message when booting under Xen

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.
>>
>> Fixes: 38ac0287b7f4 ("fbdev/efifb: Honour UEFI memory map attributes 
>> when mapping the FB")
>> Signed-off-by: Juergen Gross <jgross@...e.com>
>> ---
>>   drivers/video/fbdev/efifb.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/video/fbdev/efifb.c b/drivers/video/fbdev/efifb.c
>> index 65491ae74808..f5eccd1373e9 100644
>> --- a/drivers/video/fbdev/efifb.c
>> +++ b/drivers/video/fbdev/efifb.c
>> @@ -453,7 +453,7 @@ static int efifb_probe(struct platform_device *dev)
>>       info->apertures->ranges[0].base = efifb_fix.smem_start;
>>       info->apertures->ranges[0].size = size_remap;
>> -    if (efi_enabled(EFI_BOOT) &&
>> +    if (efi_enabled(EFI_BOOT) && !efi_enabled(EFI_PARAVIRT) &&
>>           !efi_mem_desc_lookup(efifb_fix.smem_start, &md)) {
>>           if ((efifb_fix.smem_start + efifb_fix.smem_len) >
>>               (md.phys_addr + (md.num_pages << EFI_PAGE_SHIFT))) {
>>
> 

In case I see no reaction from the maintainer for another week I'll take
this patch through the Xen tree.


Juergen