2 * Copyright (C) 2015 - ARM Ltd
3 * Author: Marc Zyngier <marc.zyngier@arm.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 #include <linux/linkage.h>
20 #include <asm/alternative.h>
21 #include <asm/assembler.h>
22 #include <asm/cpufeature.h>
23 #include <asm/kvm_arm.h>
24 #include <asm/kvm_asm.h>
25 #include <asm/kvm_mmu.h>
28 .pushsection .hyp.text, "ax"
31 stp x0, x1, [sp, #-16]!
32 stp x2, x3, [sp, #-16]!
35 .macro restore_x0_to_x3
42 * Shuffle the parameters before calling the function
43 * pointed to in x0. Assumes parameters in x[1,2,3].
57 * We used to rely on having an exception return to get
58 * an implicit isb. In the E2H case, we don't have it anymore.
59 * rather than changing all the leaf functions, just do it here
60 * before returning to the rest of the kernel.
64 ENDPROC(__vhe_hyp_call)
67 * Compute the idmap address of __kvm_hyp_reset based on the idmap
68 * start passed as a parameter, and jump there.
70 * x0: HYP phys_idmap_start
72 ENTRY(__kvm_hyp_teardown)
74 adr_l x3, __kvm_hyp_reset
76 /* insert __kvm_hyp_reset()s offset into phys_idmap_start */
77 bfi x4, x3, #0, #PAGE_SHIFT
79 ENDPROC(__kvm_hyp_teardown)
81 el1_sync: // Guest trapped into EL2
84 alternative_if_not ARM64_HAS_VIRT_HOST_EXTN
89 lsr x2, x1, #ESR_ELx_EC_SHIFT
91 cmp x2, #ESR_ELx_EC_HVC64
94 mrs x3, vttbr_el2 // If vttbr is valid, the 64bit guest
95 cbnz x3, el1_trap // called HVC
97 /* Here, we're pretty sure the host called HVC. */
100 cmp x0, #HVC_GET_VECTORS
107 * Perform the EL2 call
120 /* Guest accessed VFP/SIMD registers, save host, restore Guest */
121 cmp x2, #ESR_ELx_EC_FP_ASIMD
122 b.eq __fpsimd_guest_restore
125 mov x1, #ARM_EXCEPTION_TRAP
131 mov x1, #ARM_EXCEPTION_IRQ
134 ENTRY(__hyp_do_panic)
135 mov lr, #(PSR_F_BIT | PSR_I_BIT | PSR_A_BIT | PSR_D_BIT |\
141 ENDPROC(__hyp_do_panic)
143 .macro invalid_vector label, target = __hyp_panic
150 /* None of these should ever happen */
151 invalid_vector el2t_sync_invalid
152 invalid_vector el2t_irq_invalid
153 invalid_vector el2t_fiq_invalid
154 invalid_vector el2t_error_invalid
155 invalid_vector el2h_sync_invalid
156 invalid_vector el2h_irq_invalid
157 invalid_vector el2h_fiq_invalid
158 invalid_vector el2h_error_invalid
159 invalid_vector el1_sync_invalid
160 invalid_vector el1_irq_invalid
161 invalid_vector el1_fiq_invalid
162 invalid_vector el1_error_invalid
168 ENTRY(__kvm_hyp_vector)
169 ventry el2t_sync_invalid // Synchronous EL2t
170 ventry el2t_irq_invalid // IRQ EL2t
171 ventry el2t_fiq_invalid // FIQ EL2t
172 ventry el2t_error_invalid // Error EL2t
174 ventry el2h_sync_invalid // Synchronous EL2h
175 ventry el2h_irq_invalid // IRQ EL2h
176 ventry el2h_fiq_invalid // FIQ EL2h
177 ventry el2h_error_invalid // Error EL2h
179 ventry el1_sync // Synchronous 64-bit EL1
180 ventry el1_irq // IRQ 64-bit EL1
181 ventry el1_fiq_invalid // FIQ 64-bit EL1
182 ventry el1_error_invalid // Error 64-bit EL1
184 ventry el1_sync // Synchronous 32-bit EL1
185 ventry el1_irq // IRQ 32-bit EL1
186 ventry el1_fiq_invalid // FIQ 32-bit EL1
187 ventry el1_error_invalid // Error 32-bit EL1
188 ENDPROC(__kvm_hyp_vector)