Hi, On Thu, Dec 19, 2024 at 9:51 AM Will Deacon <will@xxxxxxxxxx> wrote: > > > As of right now, the only CPU IDs added to the "unaffected" list are > > ARM Cortex A35, A53, and A55. This list was created by looking at > > older cores listed in cputype.h that weren't listed in the "affected" > > list previously. > > There's a list of affected CPUs from Arm here: > > https://developer.arm.com/Arm%20Security%20Center/Spectre-BHB > > (obviously only covers their own designs). > > So it looks like A510 and A520 should be unaffected too, although I > didn't check exhaustively. I was hoping that newer cores would hit the supports_csv2p3() check and be considered safe, but I guess the white paper explicitly says that A510 doesn't implement it and is still considered safe. I looked up the TRM of A520 and it looks like it also doesn't set CSV2P3, so I guess I'll add that one too. > It also looks like A715 is affected but the > whitepaper doesn't tell you what version of 'k' to use... It doesn't? I see a "k" of 38 there. Wow, and Neoverse N2 needs 132!!! ...though I guess on newer steppings of those chips they'll just use "clear BHB", which seems available and is the preferred mitigation?
