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Wed, 04 Nov 2020 10:36:35 -0800 (PST) From: David Brazdil To: kvmarm@lists.cs.columbia.edu Subject: [RFC PATCH 00/26] kvm: arm64: Always-on nVHE hypervisor Date: Wed, 4 Nov 2020 18:36:04 +0000 Message-Id: <20201104183630.27513-1-dbrazdil@google.com> X-Mailer: git-send-email 2.29.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201104_133641_681067_CBA6D31C X-CRM114-Status: GOOD ( 20.52 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Lorenzo Pieralisi , kernel-team@android.com, Suzuki K Poulose , Marc Zyngier , Quentin Perret , linux-kernel@vger.kernel.org, James Morse , linux-arm-kernel@lists.infradead.org, Catalin Marinas , Tejun Heo , Dennis Zhou , Christoph Lameter , David Brazdil , Will Deacon , Julien Thierry , Andrew Scull Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org As we progress towards being able to keep guest state private to the host running nVHE hypervisor, this series allows the hypervisor to install itself on newly booted CPUs before the host is allowed to run on them. To this end, the hypervisor starts trapping host SMCs and intercepting host's PSCI CPU_ON/OFF/SUSPEND calls. It replaces the host's entry point with its own, initializes the EL2 state of the new CPU and installs the nVHE hyp vector before ERETing to the host's entry point. Other PSCI SMCs are forwarded to EL3, though only the known set of SMCs implemented in the kernel is allowed. Non-PSCI SMCs are also forwarded to EL3. Future changes will need to ensure the safety of all SMCs wrt. private guests. The host is still allowed to reset EL2 back to the stub vector, eg. for hibernation or kexec, but will not disable nVHE when there are no VMs. Tested on Rock Pi 4b. Sending this as an RFC to get feedback on the following decisions: 1) The kernel checks new cores' features against the finalized system capabilities. To avoid the need to move this code/data to EL2, the implementation only allows to boot cores that were online at the time of KVM initialization. 2) Trapping and forwarding SMCs cannot be switched off. This could cause issues eg. if EL3 always returned to EL1. A kernel command line flag may be needed to turn the feature off on such platforms. -David David Brazdil (25): psci: Export configured PSCI version psci: Export configured PSCI function IDs psci: Export psci_cpu_suspend_feature arm64: Move MAIR_EL1_SET to asm/memory.h kvm: arm64: Initialize MAIR_EL2 using a constant kvm: arm64: Add .hyp.data ELF section kvm: arm64: Support per_cpu_ptr in nVHE hyp code kvm: arm64: Create nVHE copy of cpu_logical_map kvm: arm64: Move hyp-init params to a per-CPU struct kvm: arm64: Refactor handle_trap to use a switch kvm: arm64: Extract parts of el2_setup into a macro kvm: arm64: Add SMC handler in nVHE EL2 kvm: arm64: Bootstrap PSCI SMC handler in nVHE EL2 kvm: arm64: Forward safe PSCI SMCs coming from host kvm: arm64: Add offset for hyp VA <-> PA conversion kvm: arm64: Bootstrap PSCI power state of host CPUs kvm: arm64: Intercept PSCI_CPU_OFF host SMC calls kvm: arm64: Extract __do_hyp_init into a helper function kvm: arm64: Add CPU entry point in nVHE hyp kvm: arm64: Add function to enter host from KVM nVHE hyp code kvm: arm64: Intercept PSCI_CPU_ON host SMC calls kvm: arm64: Intercept host's CPU_SUSPEND PSCI SMCs kvm: arm64: Keep nVHE EL2 vector installed kvm: arm64: Trap host SMCs kvm: arm64: Fix EL2 mode availability checks Will Deacon (1): arm64: kvm: Add standalone ticket spinlock implementation for use at hyp arch/arm64/include/asm/kvm_arm.h | 3 +- arch/arm64/include/asm/kvm_asm.h | 142 +++++++++ arch/arm64/include/asm/kvm_hyp.h | 10 + arch/arm64/include/asm/memory.h | 13 + arch/arm64/include/asm/percpu.h | 6 + arch/arm64/include/asm/sections.h | 1 + arch/arm64/include/asm/virt.h | 16 + arch/arm64/kernel/asm-offsets.c | 5 + arch/arm64/kernel/head.S | 140 +-------- arch/arm64/kernel/image-vars.h | 3 + arch/arm64/kernel/vmlinux.lds.S | 10 + arch/arm64/kvm/arm.c | 109 ++++++- arch/arm64/kvm/hyp/include/nvhe/spinlock.h | 96 ++++++ arch/arm64/kvm/hyp/nvhe/Makefile | 3 +- arch/arm64/kvm/hyp/nvhe/host.S | 9 + arch/arm64/kvm/hyp/nvhe/hyp-init.S | 82 ++++- arch/arm64/kvm/hyp/nvhe/hyp-main.c | 57 +++- arch/arm64/kvm/hyp/nvhe/hyp.lds.S | 3 + arch/arm64/kvm/hyp/nvhe/percpu.c | 38 +++ arch/arm64/kvm/hyp/nvhe/psci.c | 333 +++++++++++++++++++++ arch/arm64/mm/proc.S | 13 - drivers/firmware/psci/psci.c | 27 +- include/linux/psci.h | 20 ++ include/uapi/linux/psci.h | 8 + 24 files changed, 948 insertions(+), 199 deletions(-) create mode 100644 arch/arm64/kvm/hyp/include/nvhe/spinlock.h create mode 100644 arch/arm64/kvm/hyp/nvhe/percpu.c create mode 100644 arch/arm64/kvm/hyp/nvhe/psci.c -- 2.29.1.341.ge80a0c044ae-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel