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authorMarc Zyngier <marc.zyngier@arm.com>2012-10-05 06:11:11 -0400
committerChristoffer Dall <cdall@cs.columbia.edu>2013-03-06 18:48:43 -0500
commit3414bbfff98b2524c0b2cdc4d0a78153ebf4f823 (patch)
tree3f3e152a4864e29b7316f8b0ab9e6e7378638f6d /arch/arm/kvm
parentc5997563298bc1b9da5212c15544962d4dbbe27d (diff)
ARM: KVM: move exit handler selection to a separate file
The exit handler selection code cannot be shared with arm64 (two different modes, more exception classes...). Move it to a separate file (handle_exit.c). Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <cdall@cs.columbia.edu>
Diffstat (limited to 'arch/arm/kvm')
-rw-r--r--arch/arm/kvm/Makefile2
-rw-r--r--arch/arm/kvm/arm.c113
-rw-r--r--arch/arm/kvm/handle_exit.c140
3 files changed, 141 insertions, 114 deletions
diff --git a/arch/arm/kvm/Makefile b/arch/arm/kvm/Makefile
index fc96ce6f2357..8dc5e76cb789 100644
--- a/arch/arm/kvm/Makefile
+++ b/arch/arm/kvm/Makefile
@@ -17,7 +17,7 @@ AFLAGS_interrupts.o := -Wa,-march=armv7-a$(plus_virt)
17kvm-arm-y = $(addprefix ../../../virt/kvm/, kvm_main.o coalesced_mmio.o) 17kvm-arm-y = $(addprefix ../../../virt/kvm/, kvm_main.o coalesced_mmio.o)
18 18
19obj-y += kvm-arm.o init.o interrupts.o 19obj-y += kvm-arm.o init.o interrupts.o
20obj-y += arm.o guest.o mmu.o emulate.o reset.o 20obj-y += arm.o handle_exit.o guest.o mmu.o emulate.o reset.o
21obj-y += coproc.o coproc_a15.o mmio.o psci.o 21obj-y += coproc.o coproc_a15.o mmio.o psci.o
22obj-$(CONFIG_KVM_ARM_VGIC) += vgic.o 22obj-$(CONFIG_KVM_ARM_VGIC) += vgic.o
23obj-$(CONFIG_KVM_ARM_TIMER) += arch_timer.o 23obj-$(CONFIG_KVM_ARM_TIMER) += arch_timer.o
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index 6b776183ff93..de783ee8c341 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -30,7 +30,6 @@
30#define CREATE_TRACE_POINTS 30#define CREATE_TRACE_POINTS
31#include "trace.h" 31#include "trace.h"
32 32
33#include <asm/unified.h>
34#include <asm/uaccess.h> 33#include <asm/uaccess.h>
35#include <asm/ptrace.h> 34#include <asm/ptrace.h>
36#include <asm/mman.h> 35#include <asm/mman.h>
@@ -480,118 +479,6 @@ static void update_vttbr(struct kvm *kvm)
480 spin_unlock(&kvm_vmid_lock); 479 spin_unlock(&kvm_vmid_lock);
481} 480}
482 481
483static int handle_svc_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
484{
485 /* SVC called from Hyp mode should never get here */
486 kvm_debug("SVC called from Hyp mode shouldn't go here\n");
487 BUG();
488 return -EINVAL; /* Squash warning */
489}
490
491static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run)
492{
493 trace_kvm_hvc(*vcpu_pc(vcpu), *vcpu_reg(vcpu, 0),
494 kvm_vcpu_get_hsr(vcpu) & HSR_HVC_IMM_MASK);
495
496 if (kvm_psci_call(vcpu))
497 return 1;
498
499 kvm_inject_undefined(vcpu);
500 return 1;
501}
502
503static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run)
504{
505 if (kvm_psci_call(vcpu))
506 return 1;
507
508 kvm_inject_undefined(vcpu);
509 return 1;
510}
511
512static int handle_pabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
513{
514 /* The hypervisor should never cause aborts */
515 kvm_err("Prefetch Abort taken from Hyp mode at %#08lx (HSR: %#08x)\n",
516 kvm_vcpu_get_hfar(vcpu), kvm_vcpu_get_hsr(vcpu));
517 return -EFAULT;
518}
519
520static int handle_dabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
521{
522 /* This is either an error in the ws. code or an external abort */
523 kvm_err("Data Abort taken from Hyp mode at %#08lx (HSR: %#08x)\n",
524 kvm_vcpu_get_hfar(vcpu), kvm_vcpu_get_hsr(vcpu));
525 return -EFAULT;
526}
527
528typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *);
529static exit_handle_fn arm_exit_handlers[] = {
530 [HSR_EC_WFI] = kvm_handle_wfi,
531 [HSR_EC_CP15_32] = kvm_handle_cp15_32,
532 [HSR_EC_CP15_64] = kvm_handle_cp15_64,
533 [HSR_EC_CP14_MR] = kvm_handle_cp14_access,
534 [HSR_EC_CP14_LS] = kvm_handle_cp14_load_store,
535 [HSR_EC_CP14_64] = kvm_handle_cp14_access,
536 [HSR_EC_CP_0_13] = kvm_handle_cp_0_13_access,
537 [HSR_EC_CP10_ID] = kvm_handle_cp10_id,
538 [HSR_EC_SVC_HYP] = handle_svc_hyp,
539 [HSR_EC_HVC] = handle_hvc,
540 [HSR_EC_SMC] = handle_smc,
541 [HSR_EC_IABT] = kvm_handle_guest_abort,
542 [HSR_EC_IABT_HYP] = handle_pabt_hyp,
543 [HSR_EC_DABT] = kvm_handle_guest_abort,
544 [HSR_EC_DABT_HYP] = handle_dabt_hyp,
545};
546
547/*
548 * Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on
549 * proper exit to QEMU.
550 */
551static int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
552 int exception_index)
553{
554 unsigned long hsr_ec;
555
556 switch (exception_index) {
557 case ARM_EXCEPTION_IRQ:
558 return 1;
559 case ARM_EXCEPTION_UNDEFINED:
560 kvm_err("Undefined exception in Hyp mode at: %#08lx\n",
561 kvm_vcpu_get_hyp_pc(vcpu));
562 BUG();
563 panic("KVM: Hypervisor undefined exception!\n");
564 case ARM_EXCEPTION_DATA_ABORT:
565 case ARM_EXCEPTION_PREF_ABORT:
566 case ARM_EXCEPTION_HVC:
567 hsr_ec = kvm_vcpu_trap_get_class(vcpu);
568
569 if (hsr_ec >= ARRAY_SIZE(arm_exit_handlers)
570 || !arm_exit_handlers[hsr_ec]) {
571 kvm_err("Unkown exception class: %#08lx, "
572 "hsr: %#08x\n", hsr_ec,
573 (unsigned int)kvm_vcpu_get_hsr(vcpu));
574 BUG();
575 }
576
577 /*
578 * See ARM ARM B1.14.1: "Hyp traps on instructions
579 * that fail their condition code check"
580 */
581 if (!kvm_condition_valid(vcpu)) {
582 kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
583 return 1;
584 }
585
586 return arm_exit_handlers[hsr_ec](vcpu, run);
587 default:
588 kvm_pr_unimpl("Unsupported exception type: %d",
589 exception_index);
590 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
591 return 0;
592 }
593}
594
595static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu) 482static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
596{ 483{
597 if (likely(vcpu->arch.has_run_once)) 484 if (likely(vcpu->arch.has_run_once))
diff --git a/arch/arm/kvm/handle_exit.c b/arch/arm/kvm/handle_exit.c
new file mode 100644
index 000000000000..f1cc3a8a9c7e
--- /dev/null
+++ b/arch/arm/kvm/handle_exit.c
@@ -0,0 +1,140 @@
1/*
2 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
3 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
4 *
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.
8 *
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.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
17 */
18
19#include <linux/kvm.h>
20#include <linux/kvm_host.h>
21#include <asm/kvm_emulate.h>
22#include <asm/kvm_coproc.h>
23#include <asm/kvm_mmu.h>
24#include <asm/kvm_psci.h>
25
26typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *);
27
28static int handle_svc_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
29{
30 /* SVC called from Hyp mode should never get here */
31 kvm_debug("SVC called from Hyp mode shouldn't go here\n");
32 BUG();
33 return -EINVAL; /* Squash warning */
34}
35
36static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run)
37{
38 if (kvm_psci_call(vcpu))
39 return 1;
40
41 kvm_inject_undefined(vcpu);
42 return 1;
43}
44
45static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run)
46{
47 if (kvm_psci_call(vcpu))
48 return 1;
49
50 kvm_inject_undefined(vcpu);
51 return 1;
52}
53
54static int handle_pabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
55{
56 /* The hypervisor should never cause aborts */
57 kvm_err("Prefetch Abort taken from Hyp mode at %#08lx (HSR: %#08x)\n",
58 kvm_vcpu_get_hfar(vcpu), kvm_vcpu_get_hsr(vcpu));
59 return -EFAULT;
60}
61
62static int handle_dabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
63{
64 /* This is either an error in the ws. code or an external abort */
65 kvm_err("Data Abort taken from Hyp mode at %#08lx (HSR: %#08x)\n",
66 kvm_vcpu_get_hfar(vcpu), kvm_vcpu_get_hsr(vcpu));
67 return -EFAULT;
68}
69
70static exit_handle_fn arm_exit_handlers[] = {
71 [HSR_EC_WFI] = kvm_handle_wfi,
72 [HSR_EC_CP15_32] = kvm_handle_cp15_32,
73 [HSR_EC_CP15_64] = kvm_handle_cp15_64,
74 [HSR_EC_CP14_MR] = kvm_handle_cp14_access,
75 [HSR_EC_CP14_LS] = kvm_handle_cp14_load_store,
76 [HSR_EC_CP14_64] = kvm_handle_cp14_access,
77 [HSR_EC_CP_0_13] = kvm_handle_cp_0_13_access,
78 [HSR_EC_CP10_ID] = kvm_handle_cp10_id,
79 [HSR_EC_SVC_HYP] = handle_svc_hyp,
80 [HSR_EC_HVC] = handle_hvc,
81 [HSR_EC_SMC] = handle_smc,
82 [HSR_EC_IABT] = kvm_handle_guest_abort,
83 [HSR_EC_IABT_HYP] = handle_pabt_hyp,
84 [HSR_EC_DABT] = kvm_handle_guest_abort,
85 [HSR_EC_DABT_HYP] = handle_dabt_hyp,
86};
87
88static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu)
89{
90 u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu);
91
92 if (hsr_ec >= ARRAY_SIZE(arm_exit_handlers) ||
93 !arm_exit_handlers[hsr_ec]) {
94 kvm_err("Unkown exception class: hsr: %#08x\n",
95 (unsigned int)kvm_vcpu_get_hsr(vcpu));
96 BUG();
97 }
98
99 return arm_exit_handlers[hsr_ec];
100}
101
102/*
103 * Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on
104 * proper exit to userspace.
105 */
106int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
107 int exception_index)
108{
109 exit_handle_fn exit_handler;
110
111 switch (exception_index) {
112 case ARM_EXCEPTION_IRQ:
113 return 1;
114 case ARM_EXCEPTION_UNDEFINED:
115 kvm_err("Undefined exception in Hyp mode at: %#08lx\n",
116 kvm_vcpu_get_hyp_pc(vcpu));
117 BUG();
118 panic("KVM: Hypervisor undefined exception!\n");
119 case ARM_EXCEPTION_DATA_ABORT:
120 case ARM_EXCEPTION_PREF_ABORT:
121 case ARM_EXCEPTION_HVC:
122 /*
123 * See ARM ARM B1.14.1: "Hyp traps on instructions
124 * that fail their condition code check"
125 */
126 if (!kvm_condition_valid(vcpu)) {
127 kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
128 return 1;
129 }
130
131 exit_handler = kvm_get_exit_handler(vcpu);
132
133 return exit_handler(vcpu, run);
134 default:
135 kvm_pr_unimpl("Unsupported exception type: %d",
136 exception_index);
137 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
138 return 0;
139 }
140}
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