[PATCH 00/27] KVM: arm64: NV trap forwarding infrastructure

[Eric Auger]

Hi Marc,

On 7/12/23 16:57, Marc Zyngier wrote:
> As people are getting tired of seeing the full NV series, I've
> extracted some of the easy stuff which I'm targeting for 6.6.
>
> This implements the so called "trap forwarding" infrastructure, which
> gets used when we take a trap from an L2 guest and that the L1 guest
> wants to see the trap for itself.
>
> Most of the series is pretty boring stuff, mostly a long list of
> encodings which are mapped to a set of trap bits. I swear they are
> correct. Sort of.
>
> The interesting bit is around how we compute the trap result, which is
> pretty complex due to the layers of crap the architecture has piled
> over the years (a single op can be trapped by multiple coarse grained
> trap bits, or a fine grained trap bit, which may itself be conditioned
> by another control bit -- madness).
>
> This also results in some rework of both the FGT stuff (for which I
> carry a patch from Mark) and newly introduced the HCRX support.
>
> With that (and the rest of the NV series[1]), FGT gets exposed to guests
> and the trapping seems to work as expected.
>
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/log/?h=kvm-arm64/nv-6.6-WIP

I have not received patches 10-27 and I do not see them on lore archive
https://lore.kernel.org/all/20230712145810.3864793-1-maz@kernel.org/#r

Thanks

Eric
>
> Marc Zyngier (26):
>   arm64: Add missing VA CMO encodings
>   arm64: Add missing ERX*_EL1 encodings
>   arm64: Add missing DC ZVA/GVA/GZVA encodings
>   arm64: Add TLBI operation encodings
>   arm64: Add AT operation encodings
>   arm64: Add debug registers affected by HDFGxTR_EL2
>   arm64: Add missing BRB/CFP/DVP/CPP instructions
>   arm64: Fix HFGxTR_EL2 field naming
>   arm64: Add HDFGRTR_EL2 and HDFGWTR_EL2 layouts
>   KVM: arm64: Correctly handle ACCDATA_EL1 traps
>   KVM: arm64: Add missing HCR_EL2 trap bits
>   KVM: arm64: nv: Add FGT registers
>   KVM: arm64: Restructure FGT register switching
>   KVM: arm64: nv: Add trap forwarding infrastructure
>   KVM: arm64: nv: Add trap forwarding for HCR_EL2
>   KVM: arm64: nv: Expose FEAT_EVT to nested guests
>   KVM: arm64: nv: Add trap forwarding for MDCR_EL2
>   KVM: arm64: nv: Add trap forwarding for CNTHCTL_EL2
>   KVM: arm64: nv: Add trap forwarding for HFGxTR_EL2
>   KVM: arm64: nv: Add trap forwarding for HFGITR_EL2
>   KVM: arm64: nv: Add trap forwarding for HDFGxTR_EL2
>   KVM: arm64: nv: Add SVC trap forwarding
>   KVM: arm64: nv: Add switching support for HFGxTR/HDFGxTR
>   KVM: arm64: nv: Expose FGT to nested guests
>   KVM: arm64: Move HCRX_EL2 switch to load/put on VHE systems
>   KVM: arm64: nv: Add support for HCRX_EL2
>
> Mark Brown (1):
>   arm64: Add feature detection for fine grained traps
>
>  arch/arm64/include/asm/kvm_arm.h        |   50 +
>  arch/arm64/include/asm/kvm_host.h       |    7 +
>  arch/arm64/include/asm/kvm_nested.h     |    2 +
>  arch/arm64/include/asm/sysreg.h         |  270 +++-
>  arch/arm64/kernel/cpufeature.c          |   11 +
>  arch/arm64/kvm/arm.c                    |    4 +
>  arch/arm64/kvm/emulate-nested.c         | 1703 +++++++++++++++++++++++
>  arch/arm64/kvm/handle_exit.c            |   12 +
>  arch/arm64/kvm/hyp/include/hyp/switch.h |  126 +-
>  arch/arm64/kvm/nested.c                 |   11 +-
>  arch/arm64/kvm/sys_regs.c               |   15 +
>  arch/arm64/kvm/trace_arm.h              |   19 +
>  arch/arm64/tools/cpucaps                |    1 +
>  arch/arm64/tools/sysreg                 |  141 +-
>  14 files changed, 2326 insertions(+), 46 deletions(-)
>