kvm/hyp/entry.S

1 /* SPDX-License-Identifier: GPL-2.0-only */
3  * Copyright (C) 2015 - ARM Ltd
26 	// x1-x17: clobbered by macros
27 	// x29: guest context
39 	// defer the guest entry. The DSB isn't necessary before v8.2 as any
64 	// 	ptrauth_switch_to_guest(guest cxt, tmp1, tmp2, tmp3)
65 	// The below macro to restore guest keys is not implemented in C code
70 	// Restore the guest's sp_el0
73 	// Restore guest regs x0-x17
84 	// Restore guest regs x18-x29, lr
92 	// x2-x29,lr: vcpu regs
93 	// vcpu x0-x1 on the stack
104 	// return address to tail call into hyp_panic. As a side effect, the
105 	// current state is saved to the guest context but it will only be
106 	// accurate if the guest had been completely restored.
116 	// x2-x29,lr: vcpu regs
117 	// vcpu x0-x1 on the stack
123 	// Store the guest regs x2 and x3
126 	// Retrieve the guest regs x0-x1 from the stack
129 	// Store the guest regs x0-x1 and x4-x17
139 	// Store the guest regs x18-x29, lr
142 	// Store the guest's sp_el0
148 	// 	ptrauth_switch_to_hyp(guest cxt, host cxt, tmp1, tmp2, tmp3)
167 	// without an unmask-SError and isb. The ESB-instruction consumed any
168 	// pending guest error when we took the exception from the guest.
170 	str	x2, [x1, #(VCPU_FAULT_DISR - VCPU_CONTEXT)]
176 	dsb	sy		// Synchronize against in-flight ld/st
177 	isb			// Prevent an early read of side-effect free ISR