On Wed, Oct 14, 2026 at 04:40:15PM +0900, Itaru Kitayama wrote: > I’ve reproduced the set_id_regs failure under QEMU with kvm-arm.mode=nested > on > a host that supports AArch32. KVM advertises the NV-capable L1 vCPU as > AArch64-only, > but aa32_id_visibility() still permits the inner KVM to expose > ID_DFR0_EL1.CopDbg = 0xa > to the selftest vCPU. The test expects zero because it skips setting expected > values for AArch32 ID registers.
> In v6 you mentioned preferring an in-kernel solution. What did you have in > mind, > given that changing the value returned by GET_ONE_REG may affect the > userspace ABI? I think the idea would be to force the 32 bit ID registers to 0 like we already do for aarch64 only hosts.
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