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 SUSE Linux Products GmbH 2009
17 * Authors: Alexander Graf <agraf@suse.de>
20 #include <asm/ppc_asm.h>
21 #include <asm/kvm_asm.h>
25 #include <asm/asm-offsets.h>
26 #include <asm/asm-compat.h>
28 #ifdef CONFIG_PPC_BOOK3S_64
29 #include <asm/exception-64s.h>
32 /*****************************************************************************
34 * Real Mode handlers that need to be in low physical memory *
36 ****************************************************************************/
38 #if defined(CONFIG_PPC_BOOK3S_64)
40 #ifdef PPC64_ELF_ABI_v2
41 #define FUNC(name) name
43 #define FUNC(name) GLUE(.,name)
46 #elif defined(CONFIG_PPC_BOOK3S_32)
48 #define FUNC(name) name
50 #define RFI_TO_KERNEL RFI
51 #define RFI_TO_GUEST RFI
53 .macro INTERRUPT_TRAMPOLINE intno
55 .global kvmppc_trampoline_\intno
56 kvmppc_trampoline_\intno:
58 mtspr SPRN_SPRG_SCRATCH0, r13 /* Save r13 */
61 * First thing to do is to find out if we're coming
62 * from a KVM guest or a Linux process.
64 * To distinguish, we check a magic byte in the PACA/current
66 mfspr r13, SPRN_SPRG_THREAD
67 lwz r13, THREAD_KVM_SVCPU(r13)
68 /* PPC32 can have a NULL pointer - let's check for that */
69 mtspr SPRN_SPRG_SCRATCH1, r12 /* Save r12 */
74 mfspr r12, SPRN_SPRG_SCRATCH1
75 mfspr r13, SPRN_SPRG_SCRATCH0 /* r13 = original r13 */
76 b kvmppc_resume_\intno /* Get back original handler */
79 stw r12, HSTATE_SCRATCH1(r13)
80 mfspr r12, SPRN_SPRG_SCRATCH1
81 stw r12, HSTATE_SCRATCH0(r13)
82 lbz r12, HSTATE_IN_GUEST(r13)
83 cmpwi r12, KVM_GUEST_MODE_NONE
84 bne ..kvmppc_handler_hasmagic_\intno
85 /* No KVM guest? Then jump back to the Linux handler! */
86 lwz r12, HSTATE_SCRATCH1(r13)
89 /* Now we know we're handling a KVM guest */
90 ..kvmppc_handler_hasmagic_\intno:
92 /* Should we just skip the faulting instruction? */
93 cmpwi r12, KVM_GUEST_MODE_SKIP
94 beq kvmppc_handler_skip_ins
96 /* Let's store which interrupt we're handling */
99 /* Jump into the SLB exit code that goes to the highmem handler */
100 b kvmppc_handler_trampoline_exit
104 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_SYSTEM_RESET
105 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_MACHINE_CHECK
106 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_DATA_STORAGE
107 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_INST_STORAGE
108 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_EXTERNAL
109 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_ALIGNMENT
110 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_PROGRAM
111 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_FP_UNAVAIL
112 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_DECREMENTER
113 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_SYSCALL
114 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_TRACE
115 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_PERFMON
116 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_ALTIVEC
119 * Bring us back to the faulting code, but skip the
120 * faulting instruction.
122 * This is a generic exit path from the interrupt
128 * R13 = Shadow VCPU (PACA)
129 * HSTATE.SCRATCH0 = guest R12
130 * HSTATE.SCRATCH1 = guest CR
131 * SPRG_SCRATCH0 = guest R13
134 kvmppc_handler_skip_ins:
136 /* Patch the IP to the next instruction */
141 /* Clean up all state */
142 lwz r12, HSTATE_SCRATCH1(r13)
144 PPC_LL r12, HSTATE_SCRATCH0(r13)
147 /* And get back into the code */
152 * Call kvmppc_handler_trampoline_enter in real mode
154 * On entry, r4 contains the guest shadow MSR
155 * MSR.EE has to be 0 when calling this function
157 _GLOBAL_TOC(kvmppc_entry_trampoline)
159 LOAD_REG_ADDR(r7, kvmppc_handler_trampoline_enter)
162 li r6, MSR_IR | MSR_DR
163 andc r6, r5, r6 /* Clear DR and IR in MSR value */
165 * Set EE in HOST_MSR so that it's enabled when we get into our
166 * C exit handler function.
173 #include "book3s_segment.S"