loongarch/kvm/switch.S

1 /* SPDX-License-Identifier: GPL-2.0 */
3  * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
16 .macro kvm_save_host_gpr base  argument
18 	st.d	$r\n, \base, HGPR_OFFSET(\n)
22 .macro kvm_restore_host_gpr base  argument
24 	ld.d	$r\n, \base, HGPR_OFFSET(\n)
29  * Save and restore all GPRs except base register,
30  * and default value of base register is a2.
32 .macro kvm_save_guest_gprs base  argument
33 	.irp n,1,2,3,4,5,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31
34 	st.d	$r\n, \base, GGPR_OFFSET(\n)
38 .macro kvm_restore_guest_gprs base  argument
39 	.irp n,1,2,3,4,5,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31
40 	ld.d	$r\n, \base, GGPR_OFFSET(\n)
47  * t0, t1: temp register
68 	csrrd		t1, LOONGARCH_CSR_GSTAT
69 	bstrpick.w	t1, t1, CSR_GSTAT_GID_SHIFT_END, CSR_GSTAT_GID_SHIFT
71 	bstrins.w	t0, t1, CSR_GTLBC_TGID_SHIFT_END, CSR_GTLBC_TGID_SHIFT
96 	 *  - IRQ is disabled
97 	 *  - kernel privilege in root mode
98 	 *  - page mode keep unchanged from previous PRMD in root mode
99 	 *  - Fixme: tlb exception cannot happen since registers relative with TLB
100 	 *  -        is still in guest mode, such as pgd table/vmid registers etc,
101 	 *  -        will fix with hw page walk enabled in future
133 	ld.d	t1, a2, KVM_ARCH_HECFG
134 	or	t0, t0, t1
163 	addi.d	sp, sp, -PT_SIZE
189 	addi.d  a2, a2, -PT_SIZE
205 	addi.d	a2, sp, -PT_SIZE
222 	fpu_save_csr	a0 t1
223 	fpu_save_double a0 t1
224 	fpu_save_cc	a0 t1 t2
229 	fpu_restore_double a0 t1
230 	fpu_restore_csr    a0 t1 t2
231 	fpu_restore_cc	   a0 t1 t2
237 	fpu_save_csr    a0 t1
238 	fpu_save_cc     a0 t1 t2
239 	lsx_save_data   a0 t1
244 	lsx_restore_data a0 t1
245 	fpu_restore_cc   a0 t1 t2
246 	fpu_restore_csr  a0 t1 t2
253 	fpu_save_csr    a0 t1
254 	fpu_save_cc     a0 t1 t2
255 	lasx_save_data  a0 t1
260 	lasx_restore_data a0 t1
261 	fpu_restore_cc    a0 t1 t2
262 	fpu_restore_csr   a0 t1 t2
267 SYM_DATA(kvm_exception_size, .quad kvm_exc_entry_end - kvm_exc_entry)
268 SYM_DATA(kvm_enter_guest_size, .quad kvm_enter_guest_end - kvm_enter_guest)