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
59 	// 	ptrauth_switch_to_guest(guest cxt, tmp1, tmp2, tmp3)
60 	// The below macro to restore guest keys is not implemented in C code
65 	// Restore the guest's sp_el0
68 	// Restore guest regs x0-x17
79 	// Restore guest regs x18-x29, lr
87 	// x2-x29,lr: vcpu regs
88 	// vcpu x0-x1 on the stack
95 	// x2-x29,lr: vcpu regs
96 	// vcpu x0-x1 on the stack
107 	// return address to tail call into hyp_panic. As a side effect, the
108 	// current state is saved to the guest context but it will only be
109 	// accurate if the guest had been completely restored.
119 	// x2-x29,lr: vcpu regs
120 	// vcpu x0-x1 on the stack
126 	// Store the guest regs x2 and x3
129 	// Retrieve the guest regs x0-x1 from the stack
132 	// Store the guest regs x0-x1 and x4-x17
142 	// Store the guest regs x18-x29, lr
145 	// Store the guest's sp_el0
151 	// 	ptrauth_switch_to_hyp(guest cxt, host cxt, tmp1, tmp2, tmp3)
170 	// without an unmask-SError and isb. The ESB-instruction consumed any
171 	// pending guest error when we took the exception from the guest.
173 	str	x2, [x1, #(VCPU_FAULT_DISR - VCPU_CONTEXT)]
179 	dsb	sy		// Synchronize against in-flight ld/st
180 	isb			// Prevent an early read of side-effect free ISR