CONFIG_AMPERE_ERRATUM_AC03_CPU_38 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm64
AmpereOne: AC03_CPU_38: Certain bits in the Virtualization Translation Control Register and Translation Control Registers do not follow RES0 semantics
configname: CONFIG_AMPERE_ERRATUM_AC03_CPU_38
Linux Kernel Configuration
└─>Kernel Features
└─>ARM errata workarounds via the alternatives framework
└─>AmpereOne: AC03_CPU_38: Certain bits in the Virtualization Translation Control Register and Translation Control Registers do not follow RES0 semantics
In linux kernel since version 4.14.326 (release Date: 2023-09-23)
This option adds an alternative code sequence to work around Ampere
errata AC03_CPU_38 and AC04_CPU_10 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.
errata AC03_CPU_38 and AC04_CPU_10 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.