Hi everyone, This is version four of the patches previously posted at: Mega-patch: https://lore.kernel.org/kvmarm/20220519134204.5379-1-will@xxxxxxxxxx/ v2: https://lore.kernel.org/all/20220630135747.26983-1-will@xxxxxxxxxx/ v3: https://lore.kernel.org/kvmarm/20220914083500.5118-1-will@xxxxxxxxxx/ This series extends the pKVM EL2 code so that it can dynamically instantiate and manage VM data structures without the host being able to access them directly. These structures consist of a hyp VM, a set of hyp vCPUs and the stage-2 page-table for the MMU. The pages used to hold the hypervisor structures are returned to the host when the VM is destroyed. There are only a few small changes for v4: * Fixed missing cache maintenance when reclaiming guest pages on a system with the FWB ("Force WriteBack") CPU feature * Added a comment about locking requirements for refcount manipulation * Fixed a kbuild robot complaint when using 52-bit physical addresses * Added Vincent's Tested-by for the series * Added Oliver's Reviewed-by for the first patch * Rebased onto 6.1-rc1 One big change since v3 is that Quentin's pKVM "technical deep dive" talk from this year's KVM forum is now online and hopefully provides an enjoyable narrative to this series: https://www.youtube.com/watch?v=9npebeVFbFw There are still a bunch of extra patches needed to achieve guest/host isolation, but that follow-up work is largely stalled pending resolution of the guest private memory API (although KVM forum provided an excellent venue to iron some of those details out!): https://lore.kernel.org/kvm/20220915142913.2213336-1-chao.p.peng@xxxxxxxxxxxxxxx/T/#t The last patch remains "RFC" as it's primarily intended for testing and I couldn't think of a better way to flag it. Cheers, Will, Quentin, Fuad and Marc Cc: Sean Christopherson <seanjc@xxxxxxxxxx> Cc: Will Deacon <will@xxxxxxxxxx> Cc: Vincent Donnefort <vdonnefort@xxxxxxxxxx> Cc: Alexandru Elisei <alexandru.elisei@xxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: James Morse <james.morse@xxxxxxx> Cc: Chao Peng <chao.p.peng@xxxxxxxxxxxxxxx> Cc: Quentin Perret <qperret@xxxxxxxxxx> Cc: Suzuki K Poulose <suzuki.poulose@xxxxxxx> Cc: Mark Rutland <mark.rutland@xxxxxxx> Cc: Fuad Tabba <tabba@xxxxxxxxxx> Cc: Oliver Upton <oliver.upton@xxxxxxxxx> Cc: Marc Zyngier <maz@xxxxxxxxxx> Cc: kernel-team@xxxxxxxxxxx Cc: kvm@xxxxxxxxxxxxxxx Cc: kvmarm@xxxxxxxxxxxxxxx Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx --->8 Fuad Tabba (3): KVM: arm64: Add hyp_spinlock_t static initializer KVM: arm64: Add infrastructure to create and track pKVM instances at EL2 KVM: arm64: Instantiate pKVM hypervisor VM and vCPU structures from EL1 Quentin Perret (15): KVM: arm64: Move hyp refcount manipulation helpers to common header file KVM: arm64: Allow attaching of non-coalescable pages to a hyp pool KVM: arm64: Back the hypervisor 'struct hyp_page' array for all memory KVM: arm64: Fix-up hyp stage-1 refcounts for all pages mapped at EL2 KVM: arm64: Implement do_donate() helper for donating memory KVM: arm64: Prevent the donation of no-map pages KVM: arm64: Add helpers to pin memory shared with the hypervisor at EL2 KVM: arm64: Add per-cpu fixmap infrastructure at EL2 KVM: arm64: Add generic hyp_memcache helpers KVM: arm64: Consolidate stage-2 initialisation into a single function KVM: arm64: Instantiate guest stage-2 page-tables at EL2 KVM: arm64: Return guest memory from EL2 via dedicated teardown memcache KVM: arm64: Unmap 'kvm_arm_hyp_percpu_base' from the host KVM: arm64: Explicitly map 'kvm_vgic_global_state' at EL2 KVM: arm64: Don't unnecessarily map host kernel sections at EL2 Will Deacon (7): KVM: arm64: Unify identifiers used to distinguish host and hypervisor KVM: arm64: Include asm/kvm_mmu.h in nvhe/mem_protect.h KVM: arm64: Rename 'host_kvm' to 'host_mmu' KVM: arm64: Initialise hypervisor copies of host symbols unconditionally KVM: arm64: Provide I-cache invalidation by virtual address at EL2 KVM: arm64: Maintain a copy of 'kvm_arm_vmid_bits' at EL2 KVM: arm64: Use the pKVM hyp vCPU structure in handle___kvm_vcpu_run() arch/arm64/include/asm/kvm_arm.h | 2 +- arch/arm64/include/asm/kvm_asm.h | 7 +- arch/arm64/include/asm/kvm_host.h | 73 ++- arch/arm64/include/asm/kvm_hyp.h | 3 + arch/arm64/include/asm/kvm_mmu.h | 2 +- arch/arm64/include/asm/kvm_pgtable.h | 22 + arch/arm64/include/asm/kvm_pkvm.h | 38 ++ arch/arm64/kernel/image-vars.h | 15 - arch/arm64/kvm/arm.c | 61 ++- arch/arm64/kvm/hyp/hyp-constants.c | 3 + arch/arm64/kvm/hyp/include/nvhe/mem_protect.h | 25 +- arch/arm64/kvm/hyp/include/nvhe/memory.h | 27 + arch/arm64/kvm/hyp/include/nvhe/mm.h | 18 +- arch/arm64/kvm/hyp/include/nvhe/pkvm.h | 74 +++ arch/arm64/kvm/hyp/include/nvhe/spinlock.h | 10 +- arch/arm64/kvm/hyp/nvhe/cache.S | 11 + arch/arm64/kvm/hyp/nvhe/hyp-main.c | 110 +++- arch/arm64/kvm/hyp/nvhe/hyp-smp.c | 2 + arch/arm64/kvm/hyp/nvhe/mem_protect.c | 502 ++++++++++++++++-- arch/arm64/kvm/hyp/nvhe/mm.c | 158 +++++- arch/arm64/kvm/hyp/nvhe/page_alloc.c | 28 +- arch/arm64/kvm/hyp/nvhe/pkvm.c | 444 ++++++++++++++++ arch/arm64/kvm/hyp/nvhe/setup.c | 96 ++-- arch/arm64/kvm/hyp/pgtable.c | 21 +- arch/arm64/kvm/mmu.c | 55 +- arch/arm64/kvm/pkvm.c | 138 ++++- arch/arm64/kvm/reset.c | 29 - 27 files changed, 1758 insertions(+), 216 deletions(-) create mode 100644 arch/arm64/kvm/hyp/include/nvhe/pkvm.h -- 2.38.0.413.g74048e4d9e-goog
