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_setup_mdcr_el2 - configure vcpu mdcr_el2 value
77  *  - Performance monitors (MDCR_EL2_TPM/MDCR_EL2_TPMCR)
78  *  - Debug ROM Address (MDCR_EL2_TDRA)
79  *  - OS related registers (MDCR_EL2_TDOSA)
80  *  - Statistical profiler (MDCR_EL2_TPMS/MDCR_EL2_E2PB)
81  *  - Self-hosted Trace Filter controls (MDCR_EL2_TTRF)
89 	vcpu->arch.mdcr_el2 = __this_cpu_read(mdcr_el2) & MDCR_EL2_HPMN_MASK;  in kvm_arm_setup_mdcr_el2()
90 	vcpu->arch.mdcr_el2 |= (MDCR_EL2_TPM |  in kvm_arm_setup_mdcr_el2()
98 	if (vcpu->guest_debug)  in kvm_arm_setup_mdcr_el2()
100 		vcpu->arch.mdcr_el2 |= MDCR_EL2_TDE;  in kvm_arm_setup_mdcr_el2()
104 	 *  - Userspace is using the hardware to debug the guest  in kvm_arm_setup_mdcr_el2()
106 	 *  - The guest is not using debug (KVM_ARM64_DEBUG_DIRTY is clear).  in kvm_arm_setup_mdcr_el2()
108 	if ((vcpu->guest_debug & KVM_GUESTDBG_USE_HW) ||  in kvm_arm_setup_mdcr_el2()
109 	    !(vcpu->arch.flags & KVM_ARM64_DEBUG_DIRTY))  in kvm_arm_setup_mdcr_el2()
110 		vcpu->arch.mdcr_el2 |= MDCR_EL2_TDA;  in kvm_arm_setup_mdcr_el2()
112 	trace_kvm_arm_set_dreg32("MDCR_EL2", vcpu->arch.mdcr_el2);  in kvm_arm_setup_mdcr_el2()
116  * kvm_arm_vcpu_init_debug - setup vcpu debug traps
130  * kvm_arm_reset_debug_ptr - reset the debug ptr to point to the vcpu state
135 	vcpu->arch.debug_ptr = &vcpu->arch.vcpu_debug_state;  in kvm_arm_reset_debug_ptr()
139  * kvm_arm_setup_debug - set up debug related stuff
148  * flag on vcpu->arch.flags).  Since the guest must not interfere
156 	unsigned long mdscr, orig_mdcr_el2 = vcpu->arch.mdcr_el2;  in kvm_arm_setup_debug()
158 	trace_kvm_arm_setup_debug(vcpu, vcpu->guest_debug);  in kvm_arm_setup_debug()
163 	if (vcpu->guest_debug) {  in kvm_arm_setup_debug()
168 		 * Single Step (ARM ARM D2.12.3 The software step state  in kvm_arm_setup_debug()
171 		 * If we are doing Single Step we need to manipulate  in kvm_arm_setup_debug()
173 		 * step has occurred the hypervisor will trap the  in kvm_arm_setup_debug()
176 		 * If the guest attempts to single step its userspace  in kvm_arm_setup_debug()
183 		 * single-step behind the scenes but everything  in kvm_arm_setup_debug()
187 		if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {  in kvm_arm_setup_debug()
209 		if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW) {  in kvm_arm_setup_debug()
215 			vcpu->arch.debug_ptr = &vcpu->arch.external_debug_state;  in kvm_arm_setup_debug()
216 			vcpu->arch.flags |= KVM_ARM64_DEBUG_DIRTY;  in kvm_arm_setup_debug()
219 						&vcpu->arch.debug_ptr->dbg_bcr[0],  in kvm_arm_setup_debug()
220 						&vcpu->arch.debug_ptr->dbg_bvr[0]);  in kvm_arm_setup_debug()
223 						&vcpu->arch.debug_ptr->dbg_wcr[0],  in kvm_arm_setup_debug()
224 						&vcpu->arch.debug_ptr->dbg_wvr[0]);  in kvm_arm_setup_debug()
228 	BUG_ON(!vcpu->guest_debug &&  in kvm_arm_setup_debug()
229 		vcpu->arch.debug_ptr != &vcpu->arch.vcpu_debug_state);  in kvm_arm_setup_debug()
233 		vcpu->arch.flags |= KVM_ARM64_DEBUG_DIRTY;  in kvm_arm_setup_debug()
236 	if (has_vhe() && orig_mdcr_el2 != vcpu->arch.mdcr_el2)  in kvm_arm_setup_debug()
237 		write_sysreg(vcpu->arch.mdcr_el2, mdcr_el2);  in kvm_arm_setup_debug()
244 	trace_kvm_arm_clear_debug(vcpu->guest_debug);  in kvm_arm_clear_debug()
246 	if (vcpu->guest_debug) {  in kvm_arm_clear_debug()
253 		if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW) {  in kvm_arm_clear_debug()
257 						&vcpu->arch.debug_ptr->dbg_bcr[0],  in kvm_arm_clear_debug()
258 						&vcpu->arch.debug_ptr->dbg_bvr[0]);  in kvm_arm_clear_debug()
261 						&vcpu->arch.debug_ptr->dbg_wcr[0],  in kvm_arm_clear_debug()
262 						&vcpu->arch.debug_ptr->dbg_wvr[0]);  in kvm_arm_clear_debug()