[PATCH v4 00/29] KVM: arm64: Add support for FEAT_NV2p1 and FEAT_NV3

[Oliver Upton]

On Thu, 30 Jul 2026 08:09:53 +0100, Marc Zyngier wrote:
> This is the fourth (and hopefully last) version of a series adding
> support for two extensions targeting Nested Virt on arm64:
> 
> - FEAT_NV2p1 is effectively a bug fix for two registers (CNTHCTL_EL2
>   and CPTR_EL2) that are missing stateful bits when accessed from EL1
>   in a NV configuration. When this is present, the hypervisor can
>   avoid a bunch of traps.
> 
> [...]

Applied to next, thanks!

[01/29] arm64: sysreg: Emit RESx/UNKN values for Mapping/Fields definitions
        https://git.kernel.org/kvmarm/kvmarm/c/6ae7fab7d9d3
[02/29] arm64: Update ID_AA64MMFR4_EL1 description to 2026-03 JSON release
        https://git.kernel.org/kvmarm/kvmarm/c/1441f717ab5c
[03/29] KVM: arm64: Merge guest's HCRX_EL2 using NV_HCRX_GUEST_EXCLUDE
        https://git.kernel.org/kvmarm/kvmarm/c/4422d8b7502d
[04/29] KVM: arm64: Drop __HCRX_EL2_* masks
        https://git.kernel.org/kvmarm/kvmarm/c/34a7514b87ac
[05/29] KVM: arm64: Plumb HCRX_EL2.SRMASKEn in HCRX_EL2 sanitisation
        https://git.kernel.org/kvmarm/kvmarm/c/fed0a1e87c28
[06/29] KVM: arm64: Classify CPTR_EL2 as a SR_LOC_SPECIAL register
        https://git.kernel.org/kvmarm/kvmarm/c/0b72c4060057
[07/29] KVM: arm64: Don't evaluate HCR_EL2.NV nor HFGITR_EL2.ERET on ERET fast path
        https://git.kernel.org/kvmarm/kvmarm/c/c938c826c1ef
[08/29] arm64: Add ARM64_HAS_NV2P1 capability
        https://git.kernel.org/kvmarm/kvmarm/c/0dbb49dcdbbe
[09/29] KVM: arm64: Relax CPTR_EL2 handling when FEAT_NV2p1 is present
        https://git.kernel.org/kvmarm/kvmarm/c/649ba043262c
[10/29] KVM: arm64: Relax CNTHCTL_EL2 handling when FEAT_NV2p1 is present
        https://git.kernel.org/kvmarm/kvmarm/c/7c614e169826
[11/29] KVM: arm64: Expose FEAT_NV2p1 to NV guests
        https://git.kernel.org/kvmarm/kvmarm/c/4eb776d0b984
[12/29] arm64: Add FEAT_NV2p1 detection
        https://git.kernel.org/kvmarm/kvmarm/c/1f4177ea49b5
[13/29] arm64: sysreg: Add NVHCR_EL2 description as a mirror of HCR_EL2
        https://git.kernel.org/kvmarm/kvmarm/c/7c81d7c4ef6e
[14/29] arm64: sysreg: Add HCRX_EL2 bits related to FEAT_NV3
        https://git.kernel.org/kvmarm/kvmarm/c/9809bdf151e2
[15/29] arm64: Add ARM64_HAS_NV3 capability
        https://git.kernel.org/kvmarm/kvmarm/c/5be1b8de27dc
[16/29] KVM: arm64: Split NV-specific exit fixups from the non-NV handling
        https://git.kernel.org/kvmarm/kvmarm/c/dbb45adfcdef
[17/29] KVM: arm64: Add NV3 control bits to HCRX_EL2 sanitisation
        https://git.kernel.org/kvmarm/kvmarm/c/6ec15c963e53
[18/29] KVM: arm64: Add kvm_has_nv{2,3}() predicates
        https://git.kernel.org/kvmarm/kvmarm/c/3908e3027235
[19/29] KVM: arm64: Make HCR_EL2 a non-VNCR register
        https://git.kernel.org/kvmarm/kvmarm/c/3fc7867a95c0
[20/29] KVM: arm64: Add sanitisation for NVHCR_EL2
        https://git.kernel.org/kvmarm/kvmarm/c/3b3ae6bfaca0
[21/29] KVM: arm64: Add NVHCR_EL2 handling to the sysreg array
        https://git.kernel.org/kvmarm/kvmarm/c/0c0b2ad26b36
[22/29] KVM: arm64: Add routing for NVHCR_EL2 trap
        https://git.kernel.org/kvmarm/kvmarm/c/d6debf95f1aa
[23/29] KVM: arm64: Add NVHCR_EL2 context switching
        https://git.kernel.org/kvmarm/kvmarm/c/62ed180231f4
[24/29] KVM: arm64: Engage NV3 ERET trap elision
        https://git.kernel.org/kvmarm/kvmarm/c/c962853bf5e1
[25/29] KVM: arm64: Engage NV3 TLBI trap elision
        https://git.kernel.org/kvmarm/kvmarm/c/328ab9719ee0
[26/29] KVM: arm64: Add FEAT_NV3 detection
        https://git.kernel.org/kvmarm/kvmarm/c/a64183418a80
[27/29] KVM: arm64: Expose FEAT_NV3 to guests
        https://git.kernel.org/kvmarm/kvmarm/c/89cdbeb18382
[28/29] KVM: arm64: selftest: Add NVHCR_EL2 to get-reg-list
        https://git.kernel.org/kvmarm/kvmarm/c/1f4a10ff9090
[29/29] arm64: Add override for ID_AA64MMFR4_EL1.NV_frac
        https://git.kernel.org/kvmarm/kvmarm/c/13c164acef36

--
Best,
Oliver