Messages in this thread | | | Date | Tue, 28 Feb 2023 21:47:22 +0300 (MSK) | From | Alexander Monakov <> | Subject | Re: x86: AMD Zen2 ymm registers rolling back |
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On Wed, 22 Feb 2023, Borislav Petkov wrote:
> On Wed, Feb 22, 2023 at 09:38:09AM +0000, Andrew Cooper wrote: > > This sounds suspiciously like an errata which was fixed with a ucode > > update last year. > > Yes, it looks like it. > > Alternatively, you can try booting with "clearcpuid=xsaves" - that > should take care of your observation too but yeah, you should rather > update your microcode.
Hi folks,
I can reproduce this bug on AMD Renoir SoC:
vendor_id : AuthenticAMD cpu family : 23 model : 96 model name : AMD Ryzen 5 4600G with Radeon Graphics stepping : 1 microcode : 0x8600104
for which there's no microcode update, the microcode_amd_fam17h.bin file in the linux-firmware.git repo carries only the following patches:
$ ./amd_ucode_info.py microcode_amd_fam17h.bin Microcode patches in microcode_amd_fam17h.bin: Family=0x17 Model=0x08 Stepping=0x02: Patch=0x0800820d Length=3200 bytes Family=0x17 Model=0x01 Stepping=0x02: Patch=0x0800126e Length=3200 bytes Family=0x17 Model=0x31 Stepping=0x00: Patch=0x08301055 Length=3200 bytes
I've seen microcode version increase after a BIOS update, so it seems like internally microcode patches exist for Renoir too, but it's up to hardware vendors to pick them up as part of a BIOS update. Is there any chance of a conventional release like for the above three CPU models?
Thanks. Alexander
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