[v2] efi: avoid error message when booting under Xen

[PATCH v2] efi: avoid error message when booting under Xen

Posted by Juergen Gross 3 years, 9 months ago

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_MEMMAP is set.

Fixes: 38ac0287b7f4 ("fbdev/efifb: Honour UEFI memory map attributes when mapping the FB")
Signed-off-by: Juergen Gross <jgross@suse.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..e57c00824965 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_MEMMAP) &&
 	    !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))) {
-- 
2.26.2

Re: [PATCH v2] efi: avoid error message when booting under Xen

Posted by Ard Biesheuvel 3 years, 9 months ago

On Fri, 10 Jul 2020 at 17:24, Juergen Gross <jgross@suse.com> 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_MEMMAP is set.
>
> Fixes: 38ac0287b7f4 ("fbdev/efifb: Honour UEFI memory map attributes when mapping the FB")
> Signed-off-by: Juergen Gross <jgross@suse.com>

Acked-by: Ard Biesheuvel <ardb@kernel.org>

> ---
>  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..e57c00824965 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_MEMMAP) &&
>             !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))) {
> --
> 2.26.2
>

Re: [PATCH v2] efi: avoid error message when booting under Xen

Posted by Bartlomiej Zolnierkiewicz 3 years, 9 months ago

On 7/10/20 4:22 PM, 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_MEMMAP is set.
> 
> Fixes: 38ac0287b7f4 ("fbdev/efifb: Honour UEFI memory map attributes when mapping the FB")
> Signed-off-by: Juergen Gross <jgross@suse.com>

Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

> ---
>  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..e57c00824965 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_MEMMAP) &&
>  	    !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))) {
>