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SubjectRe: [PATCH v3 2/3] efi: Reserve confidential computing secret area
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On 14/10/2021 16:36, Greg KH wrote:
> On Thu, Oct 14, 2021 at 01:08:47PM +0000, Dov Murik wrote:
>> When efi-stub copies an EFI-provided confidential computing (coco)
>> secret area, reserve that memory block for future use within the kernel.
>>
>> Signed-off-by: Dov Murik <dovmurik@linux.ibm.com>
>> ---
>> arch/x86/platform/efi/efi.c | 1 +
>> drivers/firmware/efi/Makefile | 2 +-
>> drivers/firmware/efi/coco.c | 41 +++++++++++++++++++++++++++++++++++
>> drivers/firmware/efi/efi.c | 4 ++++
>> include/linux/efi.h | 3 +++
>> 5 files changed, 50 insertions(+), 1 deletion(-)
>> create mode 100644 drivers/firmware/efi/coco.c
>>
>> diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
>> index 147c30a81f15..35e082e5f603 100644
>> --- a/arch/x86/platform/efi/efi.c
>> +++ b/arch/x86/platform/efi/efi.c
>> @@ -93,6 +93,7 @@ static const unsigned long * const efi_tables[] = {
>> #ifdef CONFIG_LOAD_UEFI_KEYS
>> &efi.mokvar_table,
>> #endif
>> + &efi.coco_secret,
>
> Shouldn't this depend on CONFIG_EFI_SECRET?
>
> Why build all of this code if that option is not enabled?
>

Thanks Greg for noticing this. Fixed in v4 [1] where the code
is guarded with #ifdefs (so it's not built by default).

[1] https://lore.kernel.org/linux-coco/20211020061408.3447533-1-dovmurik@linux.ibm.com/

-Dov

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