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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 | /* SPDX-License-Identifier: GPL-2.0-only */ /* * Hypervisor stub * * Copyright (C) 2012 ARM Ltd. * Author: Marc Zyngier <marc.zyngier@arm.com> */ #include <linux/init.h> #include <linux/linkage.h> #include <linux/irqchip/arm-gic-v3.h> #include <asm/assembler.h> #include <asm/kvm_arm.h> #include <asm/kvm_asm.h> #include <asm/ptrace.h> #include <asm/virt.h> .text .pushsection .hyp.text, "ax" .align 11 ENTRY(__hyp_stub_vectors) ventry el2_sync_invalid // Synchronous EL2t ventry el2_irq_invalid // IRQ EL2t ventry el2_fiq_invalid // FIQ EL2t ventry el2_error_invalid // Error EL2t ventry el2_sync_invalid // Synchronous EL2h ventry el2_irq_invalid // IRQ EL2h ventry el2_fiq_invalid // FIQ EL2h ventry el2_error_invalid // Error EL2h ventry el1_sync // Synchronous 64-bit EL1 ventry el1_irq_invalid // IRQ 64-bit EL1 ventry el1_fiq_invalid // FIQ 64-bit EL1 ventry el1_error_invalid // Error 64-bit EL1 ventry el1_sync_invalid // Synchronous 32-bit EL1 ventry el1_irq_invalid // IRQ 32-bit EL1 ventry el1_fiq_invalid // FIQ 32-bit EL1 ventry el1_error_invalid // Error 32-bit EL1 ENDPROC(__hyp_stub_vectors) .align 11 el1_sync: cmp x0, #HVC_SET_VECTORS b.ne 2f msr vbar_el2, x1 b 9f 2: cmp x0, #HVC_SOFT_RESTART b.ne 3f mov x0, x2 mov x2, x4 mov x4, x1 mov x1, x3 br x4 // no return 3: cmp x0, #HVC_RESET_VECTORS beq 9f // Nothing to reset! /* Someone called kvm_call_hyp() against the hyp-stub... */ ldr x0, =HVC_STUB_ERR eret 9: mov x0, xzr eret ENDPROC(el1_sync) .macro invalid_vector label \label: b \label ENDPROC(\label) .endm invalid_vector el2_sync_invalid invalid_vector el2_irq_invalid invalid_vector el2_fiq_invalid invalid_vector el2_error_invalid invalid_vector el1_sync_invalid invalid_vector el1_irq_invalid invalid_vector el1_fiq_invalid invalid_vector el1_error_invalid /* * __hyp_set_vectors: Call this after boot to set the initial hypervisor * vectors as part of hypervisor installation. On an SMP system, this should * be called on each CPU. * * x0 must be the physical address of the new vector table, and must be * 2KB aligned. * * Before calling this, you must check that the stub hypervisor is installed * everywhere, by waiting for any secondary CPUs to be brought up and then * checking that is_hyp_mode_available() is true. * * If not, there is a pre-existing hypervisor, some CPUs failed to boot, or * something else went wrong... in such cases, trying to install a new * hypervisor is unlikely to work as desired. * * When you call into your shiny new hypervisor, sp_el2 will contain junk, * so you will need to set that to something sensible at the new hypervisor's * initialisation entry point. */ ENTRY(__hyp_set_vectors) mov x1, x0 mov x0, #HVC_SET_VECTORS hvc #0 ret ENDPROC(__hyp_set_vectors) ENTRY(__hyp_reset_vectors) mov x0, #HVC_RESET_VECTORS hvc #0 ret ENDPROC(__hyp_reset_vectors) |