Re: [PATCHv2 0/2] efi: Fix alignenment issues in unaccepted memory code

[Ard Biesheuvel]

On Tue, 17 Feb 2026, at 14:56, Tom Lendacky wrote:
> On 2/17/26 04:49, Kiryl Shutsemau (Meta) wrote:
>> This series addresses two issues related to unaligned physical addresses
>> and sizes when handling EFI unaccepted memory. These issues were
>> identified as potential sources of kernel panics in Intel TDX
>> environments due to incomplete memory reservation or missing "guard page"
>> extensions.
>> 
>> The first patch fixes the reservation of the unaccepted memory table
>> itself in efi_config_parse_tables(). It ensures the entire page range
>> covering the table is reserved even if the table doesn't start on a
>> page boundary.
>> 
>> The second patch ensures that memory acceptance requests in
>> accept_memory() and range_contains_unaccepted_memory() are page-aligned
>> before performing the unit_size alignment check. This prevents skipping
>> the necessary "guard page" extension for unaligned ranges, which is
>> required to avoid crashes with load_unaligned_zeropad().
>> 
>> v2:
>>  - Fix 'end' calculation in the second patch (Tom)
>> 
>> Kiryl Shutsemau (Meta) (2):
>>   efi: Fix reservation of unaccepted memory table
>>   efi: Align unaccepted memory range to page boundary
>> 
>>  drivers/firmware/efi/efi.c               |  8 ++++----
>>  drivers/firmware/efi/unaccepted_memory.c | 10 ++++++++--
>>  2 files changed, 12 insertions(+), 6 deletions(-)
>
> Reviewed-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
>

Thanks - I've queued this up now.