Navigation: Linux Kernel Driver DataBase - web LKDDB: Main index - A index

CONFIG_AMPERE_ERRATUM_AC03_CPU_38: AmpereOne: AC03_CPU_38: Certain bits in the Virtualization Translation Control Register and Translation Control Registers do not follow RES0 semantics

General informations

The Linux kernel configuration item CONFIG_AMPERE_ERRATUM_AC03_CPU_38:

Help text

This option adds an alternative code sequence to work around Ampere erratum AC03_CPU_38 on AmpereOne.

The affected design reports FEAT_HAFDBS as not implemented in ID_AA64MMFR1_EL1.HAFDBS, but (V)TCR_ELx.{HA,HD} are not RES0 as required by the architecture. The unadvertised HAFDBS implementation suffers from an additional erratum where hardware A/D updates can occur after a PTE has been marked invalid.

The workaround forces KVM to explicitly set VTCR_EL2.HA to 0, which avoids enabling unadvertised hardware Access Flag management at stage-2.

If unsure, say Y.



Raw data from LKDDb:


This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

Automatic links from Google (and ads)

Custom Search

Popular queries:

Navigation: Linux Kernel Driver DataBase - web LKDDB: main index - A index

Automatically generated (in year 2024). See also LKDDb sources on GitLab