(subset) [PATCH v3 00/17] KVM: arm64: Allow using VHE in the nVHE hypervisor

[Oliver Upton]

On Fri, 9 Jun 2023 17:21:43 +0100, Marc Zyngier wrote:
> KVM (on ARMv8.0) and pKVM (on all revisions of the architecture) use
> the split hypervisor model that makes the EL2 code more or less
> standalone. In the later case, we totally ignore the VHE mode and
> stick with the good old v8.0 EL2 setup.
> 
> This is all good, but means that the EL2 code is limited in what it
> can do with its own address space. This series proposes to remove this
> limitation and to allow VHE to be used even with the split hypervisor
> model. This has some potential isolation benefits[1], and eventually
> allow systems that do not support HCR_EL2.E2H==0 to run pKVM.
> 
> [...]

I decided we should probably should have this in -next for a bit before
sending a pull request. We can shove any fixes on top as needed.

Applied to kvmarm/next, thanks!

[01/17] KVM: arm64: Drop is_kernel_in_hyp_mode() from __invalidate_icache_guest_page()
        https://git.kernel.org/kvmarm/kvmarm/c/c4b9fd2ac035
[02/17] arm64: Prevent the use of is_kernel_in_hyp_mode() in hypervisor code
        https://git.kernel.org/kvmarm/kvmarm/c/35230be87ec6
[03/17] arm64: Turn kaslr_feature_override into a generic SW feature override
        https://git.kernel.org/kvmarm/kvmarm/c/0ddc312b7c73
[04/17] arm64: Add KVM_HVHE capability and has_hvhe() predicate
        https://git.kernel.org/kvmarm/kvmarm/c/e2d6c906f0ac
[05/17] arm64: Don't enable VHE for the kernel if OVERRIDE_HVHE is set
        https://git.kernel.org/kvmarm/kvmarm/c/7a26e1f51e3c
[06/17] arm64: Allow EL1 physical timer access when running VHE
        https://git.kernel.org/kvmarm/kvmarm/c/9e7462bbe00d
[07/17] arm64: Use CPACR_EL1 format to set CPTR_EL2 when E2H is set
        https://git.kernel.org/kvmarm/kvmarm/c/659803aef48b
[08/17] KVM: arm64: Remove alternatives from sysreg accessors in VHE hypervisor context
        https://git.kernel.org/kvmarm/kvmarm/c/57e784b4079e
[09/17] KVM: arm64: Key use of VHE instructions in nVHE code off ARM64_KVM_HVHE
        https://git.kernel.org/kvmarm/kvmarm/c/6f617d3aa643
[10/17] KVM: arm64: Force HCR_EL2.E2H when ARM64_KVM_HVHE is set
        https://git.kernel.org/kvmarm/kvmarm/c/d0daf5a21e63
[11/17] KVM: arm64: Disable TTBR1_EL2 when using ARM64_KVM_HVHE
        https://git.kernel.org/kvmarm/kvmarm/c/cff3b5cf96ed
[12/17] KVM: arm64: Adjust EL2 stage-1 leaf AP bits when ARM64_KVM_HVHE is set
        https://git.kernel.org/kvmarm/kvmarm/c/6537565fd9b7
[13/17] KVM: arm64: Rework CPTR_EL2 programming for HVHE configuration
        https://git.kernel.org/kvmarm/kvmarm/c/75c76ab5a641
[14/17] KVM: arm64: Program the timer traps with VHE layout in hVHE mode
        https://git.kernel.org/kvmarm/kvmarm/c/aca18585db4f
[15/17] KVM: arm64: Force HCR_E2H in guest context when ARM64_KVM_HVHE is set
        https://git.kernel.org/kvmarm/kvmarm/c/38cba55008e5
[16/17] arm64: Allow arm64_sw.hvhe on command line
        https://git.kernel.org/kvmarm/kvmarm/c/ad744e8cb346

--
Best,
Oliver