2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License, version 2, as
4 * published by the Free Software Foundation.
6 * This program is distributed in the hope that it will be useful,
7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
9 * GNU General Public License for more details.
11 * You should have received a copy of the GNU General Public License
12 * along with this program; if not, write to the Free Software
13 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
15 * Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
17 * Derived from book3s_interrupts.S, which is:
18 * Copyright SUSE Linux Products GmbH 2009
20 * Authors: Alexander Graf <agraf@suse.de>
23 #include <asm/ppc_asm.h>
24 #include <asm/kvm_asm.h>
27 #include <asm/asm-offsets.h>
28 #include <asm/exception-64s.h>
29 #include <asm/ppc-opcode.h>
31 /*****************************************************************************
33 * Guest entry / exit code that is in kernel module memory (vmalloc) *
35 ****************************************************************************/
40 _GLOBAL(__kvmppc_vcore_entry)
42 /* Write correct stack frame */
44 std r0,PPC_LR_STKOFF(r1)
46 /* Save host state to the stack */
47 stdu r1, -SWITCH_FRAME_SIZE(r1)
49 /* Save non-volatile registers (r14 - r31) and CR */
56 std r3, HSTATE_DSCR(r13)
61 std r3, HSTATE_DABR(r13)
62 END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
64 /* Save host PMU registers */
66 /* Work around P8 PMAE bug */
70 mtspr SPRN_MMCR2, r3 /* freeze all counters using MMCR2 */
72 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
74 sldi r3, r3, 31 /* MMCR0_FC (freeze counters) bit */
75 mfspr r7, SPRN_MMCR0 /* save MMCR0 */
76 mtspr SPRN_MMCR0, r3 /* freeze all counters, disable interrupts */
78 /* Clear MMCRA in order to disable SDAR updates */
82 ld r3, PACALPPACAPTR(r13) /* is the host using the PMU? */
83 lbz r5, LPPACA_PMCINUSE(r3)
85 beq 31f /* skip if not */
89 std r7, HSTATE_MMCR0(r13)
90 std r5, HSTATE_MMCR1(r13)
91 std r6, HSTATE_MMCRA(r13)
92 std r9, HSTATE_SIAR(r13)
93 std r10, HSTATE_SDAR(r13)
96 std r8, HSTATE_MMCR2(r13)
97 std r9, HSTATE_SIER(r13)
98 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
105 stw r3, HSTATE_PMC1(r13)
106 stw r5, HSTATE_PMC2(r13)
107 stw r6, HSTATE_PMC3(r13)
108 stw r7, HSTATE_PMC4(r13)
109 stw r8, HSTATE_PMC5(r13)
110 stw r9, HSTATE_PMC6(r13)
114 * Put whatever is in the decrementer into the
115 * hypervisor decrementer.
118 ld r5, HSTATE_KVM_VCORE(r13)
120 ld r9, KVM_HOST_LPCR(r6)
121 andis. r9, r9, LPCR_LD@h
122 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
126 /* On POWER9, don't sign-extend if host LPCR[LD] bit is set */
128 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
130 32: mtspr SPRN_HDEC,r8
132 std r8,HSTATE_DECEXP(r13)
134 /* Jump to partition switch code */
135 bl kvmppc_hv_entry_trampoline
139 * We return here in virtual mode after the guest exits
140 * with something that we can't handle in real mode.
141 * Interrupts are enabled again at this point.
145 * Register usage at this point:
149 * R3 = trap number on this thread
150 * R12 = exit handler id
154 /* Restore non-volatile host registers (r14 - r31) and CR */
159 addi r1, r1, SWITCH_FRAME_SIZE
160 ld r0, PPC_LR_STKOFF(r1)