* About amd ryzen 3000 bugs of rdseed and rdrand?
@ 2021-10-04 8:47 unlvsur unlvsur
2021-10-04 9:24 ` Jonathan Wakely
0 siblings, 1 reply; 2+ messages in thread
From: unlvsur unlvsur @ 2021-10-04 8:47 UTC (permalink / raw)
To: unlvsur unlvsur via Libstdc++
My computer used to always return -1 for rdseed and rdrand for ryzen 3000.
AMD Ryzen 3000 series CPUs can't do Random on boot causing Boot Failure on newer Linux distributions - LinuxReviews<https://linuxreviews.org/AMD_Ryzen_3000_series_CPUs_can%27t_do_Random_on_boot_causing_Boot_Failure_on_newer_Linux_distributions>
[PATCH] x86/CPU/AMD: Clear RDRAND CPUID bit on AMD family 15h/16h (kernel.org)<https://lore.kernel.org/all/776cb5c2d33e7fd0d2893904724c0e52b394f24a.1565817448.git.thomas.lendacky@amd.com/T/#u>
Libstdc++ uses rdseed and rdrand internally. Does it contain the rdseed bugs on ryzen 3000 cpu?
Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: About amd ryzen 3000 bugs of rdseed and rdrand?
2021-10-04 8:47 About amd ryzen 3000 bugs of rdseed and rdrand? unlvsur unlvsur
@ 2021-10-04 9:24 ` Jonathan Wakely
0 siblings, 0 replies; 2+ messages in thread
From: Jonathan Wakely @ 2021-10-04 9:24 UTC (permalink / raw)
To: unlvsur unlvsur; +Cc: unlvsur unlvsur via Libstdc++
On Mon, 4 Oct 2021 at 09:50, unlvsur unlvsur via Libstdc++
<libstdc++@gcc.gnu.org> wrote:
>
> My computer used to always return -1 for rdseed and rdrand for ryzen 3000.
>
> AMD Ryzen 3000 series CPUs can't do Random on boot causing Boot Failure on newer Linux distributions - LinuxReviews<https://linuxreviews.org/AMD_Ryzen_3000_series_CPUs_can%27t_do_Random_on_boot_causing_Boot_Failure_on_newer_Linux_distributions>
>
> [PATCH] x86/CPU/AMD: Clear RDRAND CPUID bit on AMD family 15h/16h (kernel.org)<https://lore.kernel.org/all/776cb5c2d33e7fd0d2893904724c0e52b394f24a.1565817448.git.thomas.lendacky@amd.com/T/#u>
>
> Libstdc++ uses rdseed and rdrand internally. Does it contain the rdseed bugs on ryzen 3000 cpu?
See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100444
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2021-10-04 8:47 About amd ryzen 3000 bugs of rdseed and rdrand? unlvsur unlvsur
2021-10-04 9:24 ` Jonathan Wakely
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