linux-kernel - Re: [RFC] efi: Add ACPI_MEMORY

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Date: Sat, 17 Feb 2024 08:49:32 +0100
From: Greg KH <gregkh@...uxfoundation.org>
To: Boqun Feng <boqun.feng@...il.com>
Cc: linux-arm-kernel@...r.kernel.org, stable@...r.kernel.org,
	Ard Biesheuvel <ardb@...nel.org>, linux-efi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] efi: Add ACPI_MEMORY_NVS into the linear map

On Thu, Feb 15, 2024 at 02:51:06PM -0800, Boqun Feng wrote:
> Currently ACPI_MEMORY_NVS is omitted from the linear map, which causes
> a trouble with the following firmware memory region setup:
> 
> 	[..] efi:   0x0000dfd62000-0x0000dfd83fff [ACPI Reclaim|...]
> 	[..] efi:   0x0000dfd84000-0x0000dfd87fff [ACPI Mem NVS|...]
> 
> , on ARM64 with 64k page size, the whole 0x0000dfd80000-0x0000dfd8ffff
> range will be omitted from the the linear map due to 64k round-up. And
> a page fault happens when trying to access the ACPI_RECLAIM_MEMORY:
> 
> 	[...] Unable to handle kernel paging request at virtual address ffff0000dfd80000
> 
> To fix this, add ACPI_MEMORY_NVS into the linear map.
> 
> Signed-off-by: Boqun Feng <boqun.feng@...il.com>
> Cc: stable@...r.kernel.org # 5.15+

What commit id does this fix?  Can you include that as well?

thanks,

greg k-h