Re: [PATCH 2/2] tpm: tpm_crb: enhance resource mapping mechanism for supporting AMD's fTPM
From: Jason Gunthorpe
Date: Fri Aug 30 2019 - 10:38:56 EST
On Fri, Aug 30, 2019 at 10:54:59PM +0900, Seunghun Han wrote:
> When I tested this patch in my machine, it seemed that ACPI NVS was
> saved after TPM CRB driver sent "TPM2_Shutdown(STATE)" to the fTPM
> while suspending. Then, ACPI NVS was restored while resuming.
> After resuming, PCRs didn't change and TPM2 tools such as
> tpm2_pcrlist, tpm2_extend, tpm2_getrandoms worked well.
> So, according to my test result, it seems that the patch doesn't
> create bugs and race during resume.
I have a feeling that is shear luck of link time ordering and not guarenteed??