On Sun, Jun 25, 2023 at 10:20:22AM +0200, Paul Menzel wrote: > Thank you for your great work on the Linux kernel. > > On an MSI MS-7A37/B350M MORTAR (MS-7A37) even updating to their latest > system firmware 1.O7 released on their Web site on May, 23rd 2023 [1]. > > > Beschreibung: > > - AGESA ComboAm4v2PI 1.2.0.A. update. > > - TPM Out of Bounds Access security patch. > > But Linux 6.4.-rc7 still disables the hwrng from AMD fTPM. > > Jun 24 21:32:09.978772 tokeiihto kernel: DMI: Micro-Star > International Co., Ltd. MS-7A37/B350M MORTAR (MS-7A37), BIOS 1.O7 05/09/2023 > […] > Jun 24 21:32:10.259986 tokeiihto kernel: tpm tpm0: AMD fTPM > version 0x3005700000004 causes system stutter; hwrng disabled > > Unfortunately, the warning does not say, what firmware version is > needed, and what the user can do about it. > > The comment in the code, added in v6.3-rc2 with commit f1324bbc4011 > (tpm: disable hwrng for fTPM on some AMD designs) [2], says: > > /* > * Some AMD fTPM versions may cause stutter > * https://www.amd.com/en/support/kb/faq/pa-410 > * > * Fixes are available in two series of fTPM firmware: > * 6.x.y.z series: 6.0.18.6 + > * 3.x.y.z series: 3.57.y.5 + > */ > > Mapping 0x3005700000004 from the Linux warning to the comment, I assume > the board’s firmware is 3.57.0.4? > > What AGESA ComboAm4v2PI would MSI need to ship, so the issue is fixed? > The previous system firmware version shipped 3.4e.0.4? (Is it decimal or > hexadecimal?) Sounds like this is a question for MSI - why they haven't updated from 3.57.y.4 to 3.57.y.5+. What can we possibly say about this from a Linux perspective? The Linux code apparently is working as designed by avoiding using the buggy firmware gracefully.
