[PATCH v2 00/10] KVM: arm64: Handle effective RES0 behaviour of undefined registers

[Marc Zyngier]

On Thu, 18 Sep 2025 16:13:52 +0100, Marc Zyngier wrote:
> [After yesterday's blunder, I'm reposting this, with proper commit
>  messages, and having taken Oliver's feedback into account.]
> 
> When a feature is removed from a guest, we ensure that the trap and
> control bits for that particular feature are made RES0.
> 
> For example, SCTLR2_EL2 contains a large number of bits. For any
> feature FEAT_FOO that is controlled by a bit FOO in SCTLR2_EL2, we
> make sure that SCTLR2_EL2.FOO is RES0 if FEAT_FOO is not visible to
> the guest.
> 
> [...]

Applied to next, thanks!

[01/10] KVM: arm64: Remove duplicate FEAT_{SYSREG128,MTE2} descriptions
        commit: c3b3bbd160d2014a638d40bda17909a0afd85d09
[02/10] KVM: arm64: Add reg_feat_map_desc to describe full register dependency
        commit: 559442afea8812814135ec6fa33bc62c9d09f5c4
[03/10] KVM: arm64: Enforce absence of FEAT_FGT on FGT registers
        commit: 7d3a4d048925d52e5511d82e479cbdcf7354aa7c
[04/10] KVM: arm64: Enforce absence of FEAT_FGT2 on FGT2 registers
        commit: 338a41e83c3dab81573ac33bc30f0f36bd29cd78
[05/10] KVM: arm64: Enforce absence of FEAT_HCX on HCRX_EL2
        commit: c99d62771f63116ffe54636980414fc74ab3471c
[06/10] KVM: arm64: Convert HCR_EL2 RES0 handling to compute_reg_res0_bits()
        commit: efe5406c55fb3203028507555c7da2bb417a397c
[07/10] KVM: arm64: Enforce absence of FEAT_SCTLR2 on SCTLR2_EL{1,2}
        commit: f89763efe86cc05f8465c7eea85a76183f218c56
[08/10] KVM: arm64: Enforce absence of FEAT_TCR2 on TCR2_EL2
        commit: 4870a8c1d18897681b6f6a50288d0b6dd5e21e24
[09/10] KVM: arm64: Convert SCTLR_EL1 RES0 handling to compute_reg_res0_bits()
        commit: d2a1d78ce5962b01500d09b15e2a854768552d44
[10/10] KVM: arm64: Convert MDCR_EL2 RES0 handling to compute_reg_res0_bits()
        commit: ac53365990a19e808fde2758074ee31be65d1015

Cheers,

	M.
-- 
Without deviation from the norm, progress is not possible.