1 // SPDX-License-Identifier: GPL-2.0-only
5  * Copyright (C) 2015 - Linaro Ltd
12 #include <asm/debug-monitors.h>
40 	vcpu->arch.guest_debug_preserved.mdscr_el1 = val;  in save_guest_debug_regs()
43 				vcpu->arch.guest_debug_preserved.mdscr_el1);  in save_guest_debug_regs()
48 	u64 val = vcpu->arch.guest_debug_preserved.mdscr_el1;  in restore_guest_debug_regs()
57  * kvm_arm_init_debug - grab what we need for debug
61  * presumably been set-up by some knowledgeable bootcode.
63  * It is called once per-cpu during CPU hyp initialisation.
72  * kvm_arm_reset_debug_ptr - reset the debug ptr to point to the vcpu state
77 	vcpu->arch.debug_ptr = &vcpu->arch.vcpu_debug_state;  in kvm_arm_reset_debug_ptr()
81  * kvm_arm_setup_debug - set up debug related stuff
88  *  - Performance monitors (MDCR_EL2_TPM/MDCR_EL2_TPMCR)
89  *  - Debug ROM Address (MDCR_EL2_TDRA)
90  *  - OS related registers (MDCR_EL2_TDOSA)
91  *  - Statistical profiler (MDCR_EL2_TPMS/MDCR_EL2_E2PB)
95  * flag on vcpu->arch.flags).  Since the guest must not interfere
103 	bool trap_debug = !(vcpu->arch.flags & KVM_ARM64_DEBUG_DIRTY);  in kvm_arm_setup_debug()
104 	unsigned long mdscr, orig_mdcr_el2 = vcpu->arch.mdcr_el2;  in kvm_arm_setup_debug()
106 	trace_kvm_arm_setup_debug(vcpu, vcpu->guest_debug);  in kvm_arm_setup_debug()
112 	vcpu->arch.mdcr_el2 = __this_cpu_read(mdcr_el2) & MDCR_EL2_HPMN_MASK;  in kvm_arm_setup_debug()
113 	vcpu->arch.mdcr_el2 |= (MDCR_EL2_TPM |  in kvm_arm_setup_debug()
120 	if (vcpu->guest_debug) {  in kvm_arm_setup_debug()
122 		vcpu->arch.mdcr_el2 |= MDCR_EL2_TDE;  in kvm_arm_setup_debug()
128 		 * Single Step (ARM ARM D2.12.3 The software step state  in kvm_arm_setup_debug()
131 		 * If we are doing Single Step we need to manipulate  in kvm_arm_setup_debug()
133 		 * step has occurred the hypervisor will trap the  in kvm_arm_setup_debug()
136 		 * If the guest attempts to single step its userspace  in kvm_arm_setup_debug()
143 		 * single-step behind the scenes but everything  in kvm_arm_setup_debug()
147 		if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {  in kvm_arm_setup_debug()
169 		if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW) {  in kvm_arm_setup_debug()
175 			vcpu->arch.debug_ptr = &vcpu->arch.external_debug_state;  in kvm_arm_setup_debug()
176 			vcpu->arch.flags |= KVM_ARM64_DEBUG_DIRTY;  in kvm_arm_setup_debug()
180 						&vcpu->arch.debug_ptr->dbg_bcr[0],  in kvm_arm_setup_debug()
181 						&vcpu->arch.debug_ptr->dbg_bvr[0]);  in kvm_arm_setup_debug()
184 						&vcpu->arch.debug_ptr->dbg_wcr[0],  in kvm_arm_setup_debug()
185 						&vcpu->arch.debug_ptr->dbg_wvr[0]);  in kvm_arm_setup_debug()
189 	BUG_ON(!vcpu->guest_debug &&  in kvm_arm_setup_debug()
190 		vcpu->arch.debug_ptr != &vcpu->arch.vcpu_debug_state);  in kvm_arm_setup_debug()
194 		vcpu->arch.mdcr_el2 |= MDCR_EL2_TDA;  in kvm_arm_setup_debug()
198 		vcpu->arch.flags |= KVM_ARM64_DEBUG_DIRTY;  in kvm_arm_setup_debug()
201 	if (has_vhe() && orig_mdcr_el2 != vcpu->arch.mdcr_el2)  in kvm_arm_setup_debug()
202 		write_sysreg(vcpu->arch.mdcr_el2, mdcr_el2);  in kvm_arm_setup_debug()
204 	trace_kvm_arm_set_dreg32("MDCR_EL2", vcpu->arch.mdcr_el2);  in kvm_arm_setup_debug()
210 	trace_kvm_arm_clear_debug(vcpu->guest_debug);  in kvm_arm_clear_debug()
212 	if (vcpu->guest_debug) {  in kvm_arm_clear_debug()
219 		if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW) {  in kvm_arm_clear_debug()
223 						&vcpu->arch.debug_ptr->dbg_bcr[0],  in kvm_arm_clear_debug()
224 						&vcpu->arch.debug_ptr->dbg_bvr[0]);  in kvm_arm_clear_debug()
227 						&vcpu->arch.debug_ptr->dbg_wcr[0],  in kvm_arm_clear_debug()
228 						&vcpu->arch.debug_ptr->dbg_wvr[0]);  in kvm_arm_clear_debug()