On Thu Aug 15, 2024 at 4:16 PM CEST, Tom Lendacky wrote: > On 8/15/24 08:56, Diederik de Haas wrote: > > I recently bought an Asus ROG STRIX B550-F GAMING MB with an > > AMD Ryzen 5 5500GT CPU (and installed the latest BIOS: 3607). > > I'm running Debian Testing/Sid on it with kernel 6.9 and now 6.10 > > and it seems to work great. > > I've been doing some (unrelated) tests with `rngtest` from the > > `rng-tools5` package and wondered how it would fare on my AMD CPU. > > I'm not very familiar with this test. What is the command line that you > are using to invoke it? ``` root@cs04:~# cat /dev/hwrng | rngtest -c 1000 rngtest 5 Copyright (c) 2004 by Henrique de Moraes Holschuh This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. rngtest: starting FIPS tests... cat: /dev/hwrng: No such device rngtest: entropy source drained ``` Or when using ``dd`` you'd get a similar output: ``` root@cs04:~# dd if=/dev/hwrng bs%6 | rngtest -c 1000 rngtest 5 ... rngtest: starting FIPS tests... dd: error reading '/dev/hwrng': No such device 0+0 records in 0+0 records out rngtest: entropy source drained 0 bytes copied, 4.8214e-05 s, 0.0 kB/s `` Debian package page: https://packages.debian.org/unstable/rng-tools5 Debian hasn't switched to the new upstream (yet?), but that can be found here: https://github.com/nhorman/rng-tools > > And I found out it doesn't work at all! > > But on another system I have (Asus ROG CROSSHAIR VII HERO MB + > > AMD Ryzen 1800X CPU) it works absolutely fine. > > > > # dmesg | grep ccp > > [ 5.399853] ccp 0000:07:00.2: ccp: unable to access the device: you might > > be running a broken BIOS. > > [ 5.401031] ccp 0000:07:00.2: tee enabled > > [ 5.401113] ccp 0000:07:00.2: psp enabled > > Which system is this output from? My new system ("cs04") with AMD Ryzen 5 5500GT CPU/APU. > Can you provide the output from lspci -nn? ``` root@cs04:~# lspci -nn 00:00.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Renoir/Cezanne Root Complex [1022:1630] 00:00.2 IOMMU [0806]: Advanced Micro Devices, Inc. [AMD] Renoir/Cezanne IOMMU [1022:1631] 00:01.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy Host Bridge [1022:1632] 00:02.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy Host Bridge [1022:1632] 00:02.1 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Renoir/Cezanne PCIe GPP Bridge [1022:1634] 00:02.2 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Renoir/Cezanne PCIe GPP Bridge [1022:1634] 00:08.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy Host Bridge [1022:1632] 00:08.1 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Renoir Internal PCIe GPP Bridge to Bus [1022:1635] 00:14.0 SMBus [0c05]: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller [1022:790b] (rev 51) 00:14.3 ISA bridge [0601]: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge [1022:790e] (rev 51) 00:18.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Cezanne Data Fabric; Function 0 [1022:166a] 00:18.1 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Cezanne Data Fabric; Function 1 [1022:166b] 00:18.2 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Cezanne Data Fabric; Function 2 [1022:166c] 00:18.3 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Cezanne Data Fabric; Function 3 [1022:166d] 00:18.4 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Cezanne Data Fabric; Function 4 [1022:166e] 00:18.5 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Cezanne Data Fabric; Function 5 [1022:166f] 00:18.6 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Cezanne Data Fabric; Function 6 [1022:1670] 00:18.7 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Cezanne Data Fabric; Function 7 [1022:1671] 01:00.0 USB controller [0c03]: Advanced Micro Devices, Inc. [AMD] 500 Series Chipset USB 3.1 XHCI Controller [1022:43ee] 01:00.1 SATA controller [0106]: Advanced Micro Devices, Inc. [AMD] 500 Series Chipset SATA Controller [1022:43eb] 01:00.2 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] 500 Series Chipset Switch Upstream Port [1022:43e9] 02:00.0 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Device [1022:43ea] 02:08.0 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Device [1022:43ea] 02:09.0 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Device [1022:43ea] 05:00.0 Ethernet controller [0200]: Intel Corporation Ethernet Controller I225-V [8086:15f3] (rev 03) 06:00.0 Non-Volatile memory controller [0108]: Samsung Electronics Co Ltd NVMe SSD Controller PM9A1/PM9A3/980PRO [144d:a80a] 07:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Cezanne [Radeon Vega Series / Radeon Vega Mobile Series] [1002:1638] (rev c9) 07:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Renoir Radeon High Definition Audio Controller [1002:1637] 07:00.2 Encryption controller [1080]: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 10h-1fh) Platform Security Processor [1022:15df] 07:00.3 USB controller [0c03]: Advanced Micro Devices, Inc. [AMD] Renoir/Cezanne USB 3.1 [1022:1639] 07:00.4 USB controller [0c03]: Advanced Micro Devices, Inc. [AMD] Renoir/Cezanne USB 3.1 [1022:1639] 07:00.6 Audio device [0403]: Advanced Micro Devices, Inc. [AMD] Family 17h/19h HD Audio Controller [1022:15e3] ``` Cheers, Diederik > Thanks, > Tom > > > > > Found an article [1] which could be relevant and downloaded and ran the > > accompanying test program (written by Jason Donenfeld): > > # ./amd-rdrand-bug > > Your RDRAND() does not have the AMD bug. > > # ./test-rdrand > > RDRAND() =x47c993c0 > > RDRAND() =xec7c697d > > ... (more seemingly random numbers) > > RDRAND() =xba858101 > > > > I tried it with the latest microcode dd 2024-07-10, but that didn't make > > a difference. > > > > So I'd like to know if this may actually be a bug on the kernel side. > > > > Happy to provide additional information or run tests or try patches. > > > > Cheers, > > Diederik > > > > [1] https://arstechnica.com/gadgets/2019/10/how-a-months-old-amd-microcode-bug-destroyed-my-weekend/
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