linux-kernel - Re: [PATCH v8] tpm_crb: fix fTPM on AMD Zen+ CPUs

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Message-ID: <20191021155735.GA7387@linux.intel.com>
Date:   Mon, 21 Oct 2019 18:57:35 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     ivan.lazeev@...il.com
Cc:     Peter Huewe <peterhuewe@....de>, Jason Gunthorpe <jgg@...pe.ca>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8] tpm_crb: fix fTPM on AMD Zen+ CPUs

On Wed, Oct 16, 2019 at 09:28:14PM +0300, ivan.lazeev@...il.com wrote:
> From: Ivan Lazeev <ivan.lazeev@...il.com>
> 
> Bug link: https://bugzilla.kernel.org/show_bug.cgi?id=195657
> 
> cmd/rsp buffers are expected to be in the same ACPI region.
> For Zen+ CPUs BIOS's might report two different regions, some of
> them also report region sizes inconsistent with values from TPM
> registers.
> 
> Memory configuration on ASRock x470 ITX:
> 
> db0a0000-dc59efff : Reserved
>         dc57e000-dc57efff : MSFT0101:00
>         dc582000-dc582fff : MSFT0101:00
> 
> Work around the issue by storing ACPI regions declared for the
> device in a fixed array and adding an array for pointers to
> corresponding possibly allocated resources in crb_map_io function.
> This data was previously held for a single resource
> in struct crb_priv (iobase field) and local variable io_res in
> crb_map_io function. ACPI resources array is used to find index of
> corresponding region for each buffer and make the buffer size
> consistent with region's length. Array of pointers to allocated
> resources is used to map the region at most once.
> 
> Signed-off-by: Ivan Lazeev <ivan.lazeev@...il.com>

Almost tested this today. Unfortunately the USB stick at hand was
broken.  I'll retry tomorrow or Wed depending on which day I visit at
the office and which day I WFH.

At least the AMI BIOS had all the TPM stuff in it. The hardware I'll be
using is Udoo Bolt V8 (thanks Jerry for pointing me out this device)
with AMD Ryzen Embedded V1605B [1]

Thanks for the patience with your patch.

[1] https://en.wikichip.org/wiki/amd/ryzen_embedded/v1605b

/Jarkko