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Re: [PATCH] EFI: adjust cfg file buffer freeing
- To: Bernhard Kaindl <bernhard.kaindl@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 22 Apr 2026 15:41:17 +0200
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- Cc: Marek Marczykowski <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, Daniel Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper@xxxxxxxxxx>
- Delivery-date: Wed, 22 Apr 2026 13:41:25 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 22.04.2026 15:16, Bernhard Kaindl wrote:
> Jan Beulich wrote:
> PS: Gitweb finds this commit for adding the function:
>
> https://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=0d6a3c755374f04f6dd25373da28291a8f35bede
>
> efi: introduce efi_arch_flush_dcache_area
>
> Objects loaded by FileHandle->Read need to be flushed from dcache,
> otherwise copy_from_paddr will read stale data when copying the kernel,
> causing a failure to boot.
I.e. irrelevant to the cfg file buffer. So what we could do there to
make things less questionable (as to ordering) is
if ( file == &cfg )
file->str[file->size] = 0;
else
efi_arch_flush_dcache_area(file->ptr, file->size);
> Introduce efi_arch_flush_dcache_area and call it from read_file.
>
> This commit introduces no functional changes on x86.
>
> Reported-by: Mark Rutland <mark.rutland@xxxxxxx>
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Stefano, any thoughts?
Jan
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