But this is functional enough that I can run an L4 guest on my QC box. Slowly. As an added bonus, this series now includes the last two patches that switch the damned thing on. Does it mean this is bug-free? Of course not. But we're at a point where NV is no longer a third-rate citizen. Only a second-rate one. Patches on top of v6.15-rc1. The full integration is, as always, in my kvm-arm64/nv-next branch. * From v1: - Rebased on 6.15-rc1 - Picked up the last two patches to enable the full NV shebang [1] https://lore.kernel.org/r/20250215150134.3765791-10-maz@xxxxxxxxxx Marc Zyngier (17): arm64: sysreg: Add layout for VNCR_EL2 KVM: arm64: nv: Allocate VNCR page when required KVM: arm64: nv: Extract translation helper from the AT code KVM: arm64: nv: Snapshot S1 ASID tagging information during walk KVM: arm64: nv: Move TLBI range decoding to a helper KVM: arm64: nv: Don't adjust PSTATE.M when L2 is nesting KVM: arm64: nv: Add pseudo-TLB backing VNCR_EL2 KVM: arm64: nv: Add userspace and guest handling of VNCR_EL2 KVM: arm64: nv: Handle VNCR_EL2-triggered faults KVM: arm64: nv: Handle mapping of VNCR_EL2 at EL2 KVM: arm64: nv: Handle VNCR_EL2 invalidation from MMU notifiers KVM: arm64: nv: Program host's VNCR_EL2 to the fixmap address KVM: arm64: nv: Add S1 TLB invalidation primitive for VNCR_EL2 KVM: arm64: nv: Plumb TLBI S1E2 into system instruction dispatch KVM: arm64: nv: Remove dead code from ERET handling KVM: arm64: Allow userspace to request KVM_ARM_VCPU_EL2* KVM: arm64: Document NV caps and vcpu flags Documentation/virt/kvm/api.rst | 14 +- arch/arm64/include/asm/esr.h | 2 + arch/arm64/include/asm/fixmap.h | 6 + arch/arm64/include/asm/kvm_host.h | 15 +- arch/arm64/include/asm/kvm_nested.h | 100 +++++ arch/arm64/include/asm/sysreg.h | 1 - arch/arm64/kvm/arm.c | 10 + arch/arm64/kvm/at.c | 123 +++--- arch/arm64/kvm/emulate-nested.c | 7 - arch/arm64/kvm/handle_exit.c | 1 + arch/arm64/kvm/hyp/vhe/switch.c | 46 ++- arch/arm64/kvm/nested.c | 608 +++++++++++++++++++++++++++- arch/arm64/kvm/reset.c | 2 + arch/arm64/kvm/sys_regs.c | 135 +++--- arch/arm64/tools/sysreg | 6 + include/uapi/linux/kvm.h | 2 + 16 files changed, 940 insertions(+), 138 deletions(-) -- 2.39.2
