1 /* SPDX-License-Identifier: GPL-2.0-only */
4 * Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
6 * Derived from book3s_interrupts.S, which is:
7 * Copyright SUSE Linux Products GmbH 2009
9 * Authors: Alexander Graf <agraf@suse.de>
12 #include <linux/linkage.h>
13 #include <asm/ppc_asm.h>
14 #include <asm/kvm_asm.h>
17 #include <asm/asm-offsets.h>
18 #include <asm/exception-64s.h>
19 #include <asm/ppc-opcode.h>
20 #include <asm/asm-compat.h>
21 #include <asm/feature-fixups.h>
23 /*****************************************************************************
25 * Guest entry / exit code that is in kernel module memory (vmalloc) *
27 ****************************************************************************/
32 _GLOBAL(__kvmppc_vcore_entry)
34 /* Write correct stack frame */
36 std r0,PPC_LR_STKOFF(r1)
38 /* Save host state to the stack */
39 stdu r1, -SWITCH_FRAME_SIZE(r1)
41 /* Save non-volatile registers (r14 - r31) and CR */
48 std r3, HSTATE_DSCR(r13)
53 std r3, HSTATE_DABR(r13)
54 END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
56 /* Save host PMU registers */
57 bl kvmhv_save_host_pmu
60 * Put whatever is in the decrementer into the
61 * hypervisor decrementer.
62 * Because of a hardware deviation in P8,
63 * we need to set LPCR[HDICE] before writing HDEC.
65 ld r5, HSTATE_KVM_VCORE(r13)
67 ld r9, KVM_HOST_LPCR(r6)
68 ori r8, r9, LPCR_HDICE
76 std r8,HSTATE_DECEXP(r13)
78 /* Jump to partition switch code */
79 bl kvmppc_hv_entry_trampoline
83 * We return here in virtual mode after the guest exits
84 * with something that we can't handle in real mode.
85 * Interrupts are still hard-disabled.
89 * Register usage at this point:
93 * R3 = trap number on this thread
94 * R12 = exit handler id
98 /* Restore non-volatile host registers (r14 - r31) and CR */
103 addi r1, r1, SWITCH_FRAME_SIZE
104 ld r0, PPC_LR_STKOFF(r1)
109 * void kvmhv_save_host_pmu(void)
111 SYM_FUNC_START_LOCAL(kvmhv_save_host_pmu)
113 /* Work around P8 PMAE bug */
117 mtspr SPRN_MMCR2, r3 /* freeze all counters using MMCR2 */
119 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
121 sldi r3, r3, 31 /* MMCR0_FC (freeze counters) bit */
122 mfspr r7, SPRN_MMCR0 /* save MMCR0 */
123 mtspr SPRN_MMCR0, r3 /* freeze all counters, disable interrupts */
125 /* Clear MMCRA in order to disable SDAR updates */
129 lbz r5, PACA_PMCINUSE(r13) /* is the host using the PMU? */
131 beq 31f /* skip if not */
135 std r7, HSTATE_MMCR0(r13)
136 std r5, HSTATE_MMCR1(r13)
137 std r6, HSTATE_MMCRA(r13)
138 std r9, HSTATE_SIAR(r13)
139 std r10, HSTATE_SDAR(r13)
142 std r8, HSTATE_MMCR2(r13)
143 std r9, HSTATE_SIER(r13)
144 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
151 stw r3, HSTATE_PMC1(r13)
152 stw r5, HSTATE_PMC2(r13)
153 stw r6, HSTATE_PMC3(r13)
154 stw r7, HSTATE_PMC4(r13)
155 stw r8, HSTATE_PMC5(r13)
156 stw r9, HSTATE_PMC6(r13)
158 SYM_FUNC_END(kvmhv_save_host_pmu)