[edk2-devel] [Patch] StandaloneMmPkg: Fixed communicating from TF-A failed issue
Ming Huang
huangming at linux.alibaba.com
Thu Jun 10 01:14:22 UTC 2021
On 6/9/21 3:10 PM, Ard Biesheuvel wrote:
> On Tue, 8 Jun 2021 at 16:21, Ming Huang <huangming at linux.alibaba.com> wrote:
>>
>> TF-A: TrustedFirmware-a
>> SPM: Secure Partition Manager(MM)
>>
>> For AArch64, when SPM enable in TF-A, TF-A may communicate to MM
>> with buffer address (PLAT_SPM_BUF_BASE). The address is different
>> from PcdMmBufferBase which use in edk2.
>
> Then why do we have PcdMmBufferBase?
ArmPkg use this Pcd for the base address of non-secure communication buffer.
>
> Is it possible to set PcdMmBufferBase to the correct value?
The secure communication may interrupt the non-secure communication. if we
use the same address (PcdMmBufferBase and PLAT_SPM_BUF_BASE), the date in
communication buffer may be corrupted.
Best Regards,
Ming
>
>> Checking address will let TF-A communicate failed to MM. So remove
>> below checking code:
>> if (NsCommBufferAddr < mNsCommBuffer.PhysicalStart) {
>> return EFI_ACCESS_DENIED;
>> }
>>
>> Signed-off-by: Ming Huang <huangming at linux.alibaba.com>
>> ---
>> StandaloneMmPkg/Drivers/StandaloneMmCpu/AArch64/EventHandle.c | 4 ----
>> 1 file changed, 4 deletions(-)
>>
>> diff --git a/StandaloneMmPkg/Drivers/StandaloneMmCpu/AArch64/EventHandle.c b/StandaloneMmPkg/Drivers/StandaloneMmCpu/AArch64/EventHandle.c
>> index 63fbe26642..fe98d3181d 100644
>> --- a/StandaloneMmPkg/Drivers/StandaloneMmCpu/AArch64/EventHandle.c
>> +++ b/StandaloneMmPkg/Drivers/StandaloneMmCpu/AArch64/EventHandle.c
>> @@ -103,10 +103,6 @@ PiMmStandaloneArmTfCpuDriverEntry (
>> return EFI_INVALID_PARAMETER;
>> }
>>
>> - if (NsCommBufferAddr < mNsCommBuffer.PhysicalStart) {
>> - return EFI_ACCESS_DENIED;
>> - }
>> -
>> if ((NsCommBufferAddr + sizeof (EFI_MM_COMMUNICATE_HEADER)) >=
>> (mNsCommBuffer.PhysicalStart + mNsCommBuffer.PhysicalSize)) {
>> return EFI_INVALID_PARAMETER;
>> --
>> 2.17.1
>>
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