As a step on the way to isolating hyp from the host on nVHE as part of Android's "Protected KVM" project, this series introduces a separate register context. Topics include: - RAS for nVHE - Panicking from guest vectors with SCS - Switching to hyp context - Migrating hyp interface off of function pointers First 4 patches are small refactors. Then an exception vector is added just for the nVHE host to untangle the existing EL2 vector e.g. to separate the RAS cases. Hyp panics from the guest context, e.g. from an invalid vector, are fixed so they have a chance of completely cleanly with features that depend on register state such as x18 for shadow call stack (SCS) enabled on VHE. Finally, hyp is made to switch to its own context rather than borrowing the host context before migrating the hyp interface from raw function pointers to SMCCC based functions IDs. >From v3: - https://lore.kernel.org/kvmarm/20200903135307.251331-1-ascull@xxxxxxxxxx/ - Rebased onto 5.9-rc4 - Addressed review comments >From v2: - https://lore.kernel.org/kvmarm/20200820103446.959000-1-ascull@xxxxxxxxxx/ - Rebased onto 5.9-rc3. - Removed some of the unused separation of host and hyp. >From v1: - https://lore.kernel.org/kvmarm/20200715184438.1390996-1-ascull@xxxxxxxxxx/ - HVC microbenchmark overhead cut from over 15% to under 6%. - Abandon the symmetry of a run loop in hyp and treating the host as a vCPU as there was little practical benefit for the overhead it introduced. Cc: Marc Zyngier <maz@xxxxxxxxxx> Cc: James Morse <james.morse@xxxxxxx> Cc: Suzuki Poulose <suzuki.poulose@xxxxxxx> Cc: Sudeep Holla <sudeep.holla@xxxxxxx> Cc: Will Deacon <will@xxxxxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: kernel-team@xxxxxxxxxxx Cc: kvmarm@xxxxxxxxxxxxxxxxxxxxx Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx *** BLURB HERE *** Andrew Scull (19): KVM: arm64: Remove __activate_vm wrapper KVM: arm64: Remove hyp_panic arguments KVM: arm64: Remove kvm_host_data_t typedef KVM: arm64: Choose hyp symbol based on context KVM: arm64: Save chosen hyp vector to a percpu variable KVM: arm64: nVHE: Use separate vector for the host KVM: arm64: nVHE: Don't consume host SErrors with ESB KVM: arm64: Introduce hyp context KVM: arm64: Update context references from host to hyp KVM: arm64: Restore hyp when panicking in guest context KVM: arm64: Share context save and restore macros KVM: arm64: nVHE: Switch to hyp context for EL2 KVM: arm64: nVHE: Handle hyp panics KVM: arm64: nVHE: Pass pointers consistently to hyp-init smccc: Define vendor hyp owned service call region smccc: Use separate variables for args and results KVM: arm64: nVHE: Migrate hyp interface to SMCCC KVM: arm64: nVHE: Migrate hyp-init to SMCCC KVM: arm64: nVHE: Fix pointers during SMCCC convertion arch/arm64/include/asm/kvm_asm.h | 100 ++++++++++++- arch/arm64/include/asm/kvm_host.h | 26 ++-- arch/arm64/include/asm/kvm_hyp.h | 9 +- arch/arm64/include/asm/kvm_ptrauth.h | 6 +- arch/arm64/kernel/image-vars.h | 2 + arch/arm64/kvm/Makefile | 2 +- arch/arm64/kvm/arm.c | 34 ++++- arch/arm64/kvm/hyp.S | 34 ----- arch/arm64/kvm/hyp/entry.S | 95 +++++------- arch/arm64/kvm/hyp/hyp-entry.S | 76 +--------- arch/arm64/kvm/hyp/include/hyp/switch.h | 15 +- arch/arm64/kvm/hyp/nvhe/Makefile | 2 +- arch/arm64/kvm/hyp/nvhe/host.S | 187 ++++++++++++++++++++++++ arch/arm64/kvm/hyp/nvhe/hyp-init.S | 67 +++++---- arch/arm64/kvm/hyp/nvhe/hyp-main.c | 117 +++++++++++++++ arch/arm64/kvm/hyp/nvhe/switch.c | 41 +++--- arch/arm64/kvm/hyp/nvhe/tlb.c | 2 - arch/arm64/kvm/hyp/vhe/switch.c | 24 +-- arch/arm64/kvm/vgic/vgic-v3.c | 4 +- include/linux/arm-smccc.h | 74 ++++------ 20 files changed, 602 insertions(+), 315 deletions(-) delete mode 100644 arch/arm64/kvm/hyp.S create mode 100644 arch/arm64/kvm/hyp/nvhe/host.S create mode 100644 arch/arm64/kvm/hyp/nvhe/hyp-main.c -- 2.28.0.618.gf4bc123cb7-goog _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
