BPI-R4 with Filogic 880 (Arm Cortex-A73): Spectre-BHB.

[Robert Marko]

On Wed, 5 Mar 2025 at 14:43, Martin Schiller <ms at dev.tdt.de> wrote:
>
> CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY was disabled with commit
> 6b007d2512ad (treewide: disable spectre mitigation on unaffected Arm64
> targets) for all targets in target/linux/mediatek/filogic folder, but
> the Arm Cortex-A73 in the Filogic 880 are affected [0].
>
> So should we enable CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY for this
> subtarget again?

If MT7988 is affected then yes.

>
> On the other hand, the target.mk in this subtarget folder states it is
> CPU_TYPE:=cortex-a53, which is not correct for all the supported systems
> in this subtarget.
>
> Do we have to split this subtarget into filogic830, filogic880, etc.?

This is intentionally done, as A73 core is backwards compatible with
A53 instructions
since it only adds on top of it, so to not introduce yet another
package target A53 ones
are reused.

Regards,
Robert
>
> Regards,
> Martin
>
> [0]
> https://developer.arm.com/Arm%20Security%20Center/Speculative%20Processor%20Vulnerability
>
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