3  * Debug and Guest Debug support
12 #include <asm/debug-monitors.h>
29  * For some debug operations we need to tweak some guest registers. As
69  * kvm_arm_init_debug - grab what we need for debug
90  *  - Debug ROM Address (MDCR_EL2_TDRA)
112 		/* Route all software debug exceptions to EL2 */  in kvm_arm_setup_mdcr_el2()
116 	 * Trap debug register access when one of the following is true:  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()
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
155  * kvm_arm_setup_debug - set up debug related stuff
160  * debug related registers.
162  * Additionally, KVM only traps guest accesses to the debug registers if
167  * debug registers.
178 	/* Check if we need to use the debug registers. */  in kvm_arm_setup_debug()
180 		/* Save guest debug state */  in kvm_arm_setup_debug()
190 		 * debug exception and we return to userspace.  in kvm_arm_setup_debug()
232 		 * debug ioctl. The existing DEBUG_DIRTY mechanism ensures  in kvm_arm_setup_debug()
253 		 * The OS Lock blocks debug exceptions in all ELs when it is  in kvm_arm_setup_debug()
256 		 * MDSCR_EL1.MDE. In so doing, we ensure that host debug  in kvm_arm_setup_debug()
286 	 * Restore the guest's debug registers if we were using them.  in kvm_arm_clear_debug()
301 		 * If we were using HW debug we need to restore the  in kvm_arm_clear_debug()
302 		 * debug_ptr to the guest debug state.  in kvm_arm_clear_debug()