1 // SPDX-License-Identifier: GPL-2.0-only
5  * Copyright (C) 2015 - Linaro Ltd
12 #include <asm/debug-monitors.h>
36  * When single-step is enabled by userspace, we tweak PSTATE.SS on every
38  * for the vcpu after the single-step is disabled.
44 	vcpu->arch.guest_debug_preserved.mdscr_el1 = val;  in save_guest_debug_regs()
47 				vcpu->arch.guest_debug_preserved.mdscr_el1);  in save_guest_debug_regs()
49 	vcpu->arch.guest_debug_preserved.pstate_ss =  in save_guest_debug_regs()
55 	u64 val = vcpu->arch.guest_debug_preserved.mdscr_el1;  in restore_guest_debug_regs()
62 	if (vcpu->arch.guest_debug_preserved.pstate_ss)  in restore_guest_debug_regs()
69  * kvm_arm_init_debug - grab what we need for debug
73  * presumably been set-up by some knowledgeable bootcode.
75  * It is called once per-cpu during CPU hyp initialisation.
84  * kvm_arm_setup_mdcr_el2 - configure vcpu mdcr_el2 value
89  *  - Performance monitors (MDCR_EL2_TPM/MDCR_EL2_TPMCR)
90  *  - Debug ROM Address (MDCR_EL2_TDRA)
91  *  - OS related registers (MDCR_EL2_TDOSA)
92  *  - Statistical profiler (MDCR_EL2_TPMS/MDCR_EL2_E2PB)
93  *  - Self-hosted Trace Filter controls (MDCR_EL2_TTRF)
94  *  - Self-hosted Trace (MDCR_EL2_TTRF/MDCR_EL2_E2TB)
102 	vcpu->arch.mdcr_el2 = __this_cpu_read(mdcr_el2) & MDCR_EL2_HPMN_MASK;  in kvm_arm_setup_mdcr_el2()
103 	vcpu->arch.mdcr_el2 |= (MDCR_EL2_TPM |  in kvm_arm_setup_mdcr_el2()
111 	if (vcpu->guest_debug)  in kvm_arm_setup_mdcr_el2()
113 		vcpu->arch.mdcr_el2 |= MDCR_EL2_TDE;  in kvm_arm_setup_mdcr_el2()
117 	 *  - Userspace is using the hardware to debug the guest  in kvm_arm_setup_mdcr_el2()
119 	 *  - The guest is not using debug (DEBUG_DIRTY clear).  in kvm_arm_setup_mdcr_el2()
120 	 *  - The guest has enabled the OS Lock (debug exceptions are blocked).  in kvm_arm_setup_mdcr_el2()
122 	if ((vcpu->guest_debug & KVM_GUESTDBG_USE_HW) ||  in kvm_arm_setup_mdcr_el2()
125 		vcpu->arch.mdcr_el2 |= MDCR_EL2_TDA;  in kvm_arm_setup_mdcr_el2()
127 	trace_kvm_arm_set_dreg32("MDCR_EL2", vcpu->arch.mdcr_el2);  in kvm_arm_setup_mdcr_el2()
131  * kvm_arm_vcpu_init_debug - setup vcpu debug traps
145  * kvm_arm_reset_debug_ptr - reset the debug ptr to point to the vcpu state
150 	vcpu->arch.debug_ptr = &vcpu->arch.vcpu_debug_state;  in kvm_arm_reset_debug_ptr()
154  * kvm_arm_setup_debug - set up debug related stuff
163  * flag on vcpu->arch.iflags).  Since the guest must not interfere
171 	unsigned long mdscr, orig_mdcr_el2 = vcpu->arch.mdcr_el2;  in kvm_arm_setup_debug()
173 	trace_kvm_arm_setup_debug(vcpu, vcpu->guest_debug);  in kvm_arm_setup_debug()
178 	if (vcpu->guest_debug || kvm_vcpu_os_lock_enabled(vcpu)) {  in kvm_arm_setup_debug()
183 		 * Single Step (ARM ARM D2.12.3 The software step state  in kvm_arm_setup_debug()
186 		 * If we are doing Single Step we need to manipulate  in kvm_arm_setup_debug()
188 		 * step has occurred the hypervisor will trap the  in kvm_arm_setup_debug()
191 		 * If the guest attempts to single step its userspace  in kvm_arm_setup_debug()
198 		 * single-step behind the scenes but everything  in kvm_arm_setup_debug()
202 		if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {  in kvm_arm_setup_debug()
204 			 * If the software step state at the last guest exit  in kvm_arm_setup_debug()
205 			 * was Active-pending, we don't set DBG_SPSR_SS so  in kvm_arm_setup_debug()
207 			 * single-step until the pending Software Step  in kvm_arm_setup_debug()
234 		if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW) {  in kvm_arm_setup_debug()
240 			vcpu->arch.debug_ptr = &vcpu->arch.external_debug_state;  in kvm_arm_setup_debug()
244 						&vcpu->arch.debug_ptr->dbg_bcr[0],  in kvm_arm_setup_debug()
245 						&vcpu->arch.debug_ptr->dbg_bvr[0]);  in kvm_arm_setup_debug()
248 						&vcpu->arch.debug_ptr->dbg_wcr[0],  in kvm_arm_setup_debug()
249 						&vcpu->arch.debug_ptr->dbg_wvr[0]);  in kvm_arm_setup_debug()
266 	BUG_ON(!vcpu->guest_debug &&  in kvm_arm_setup_debug()
267 		vcpu->arch.debug_ptr != &vcpu->arch.vcpu_debug_state);  in kvm_arm_setup_debug()
274 	if (has_vhe() && orig_mdcr_el2 != vcpu->arch.mdcr_el2)  in kvm_arm_setup_debug()
275 		write_sysreg(vcpu->arch.mdcr_el2, mdcr_el2);  in kvm_arm_setup_debug()
282 	trace_kvm_arm_clear_debug(vcpu->guest_debug);  in kvm_arm_clear_debug()
287 	if (vcpu->guest_debug || kvm_vcpu_os_lock_enabled(vcpu)) {  in kvm_arm_clear_debug()
288 		if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {  in kvm_arm_clear_debug()
292 				 * until Software Step exception is taken.  in kvm_arm_clear_debug()
303 		if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW) {  in kvm_arm_clear_debug()
307 						&vcpu->arch.debug_ptr->dbg_bcr[0],  in kvm_arm_clear_debug()
308 						&vcpu->arch.debug_ptr->dbg_bvr[0]);  in kvm_arm_clear_debug()
311 						&vcpu->arch.debug_ptr->dbg_wcr[0],  in kvm_arm_clear_debug()
312 						&vcpu->arch.debug_ptr->dbg_wvr[0]);  in kvm_arm_clear_debug()