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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>
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Marc Zyngier
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Christoffer Dall
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Mar 6, 2013
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,140 @@ | ||
| /* | ||
| * Copyright (C) 2012 - Virtual Open Systems and Columbia University | ||
| * Author: Christoffer Dall <c.dall@virtualopensystems.com> | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License, version 2, as | ||
| * published by the Free Software Foundation. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program; if not, write to the Free Software | ||
| * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | ||
| */ | ||
|
|
||
| #include <linux/kvm.h> | ||
| #include <linux/kvm_host.h> | ||
| #include <asm/kvm_emulate.h> | ||
| #include <asm/kvm_coproc.h> | ||
| #include <asm/kvm_mmu.h> | ||
| #include <asm/kvm_psci.h> | ||
|
|
||
| typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *); | ||
|
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| static int handle_svc_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run) | ||
| { | ||
| /* SVC called from Hyp mode should never get here */ | ||
| kvm_debug("SVC called from Hyp mode shouldn't go here\n"); | ||
| BUG(); | ||
| return -EINVAL; /* Squash warning */ | ||
| } | ||
|
|
||
| static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run) | ||
| { | ||
| if (kvm_psci_call(vcpu)) | ||
| return 1; | ||
|
|
||
| kvm_inject_undefined(vcpu); | ||
| return 1; | ||
| } | ||
|
|
||
| static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run) | ||
| { | ||
| if (kvm_psci_call(vcpu)) | ||
| return 1; | ||
|
|
||
| kvm_inject_undefined(vcpu); | ||
| return 1; | ||
| } | ||
|
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||
| static int handle_pabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run) | ||
| { | ||
| /* The hypervisor should never cause aborts */ | ||
| kvm_err("Prefetch Abort taken from Hyp mode at %#08lx (HSR: %#08x)\n", | ||
| kvm_vcpu_get_hfar(vcpu), kvm_vcpu_get_hsr(vcpu)); | ||
| return -EFAULT; | ||
| } | ||
|
|
||
| static int handle_dabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run) | ||
| { | ||
| /* This is either an error in the ws. code or an external abort */ | ||
| kvm_err("Data Abort taken from Hyp mode at %#08lx (HSR: %#08x)\n", | ||
| kvm_vcpu_get_hfar(vcpu), kvm_vcpu_get_hsr(vcpu)); | ||
| return -EFAULT; | ||
| } | ||
|
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||
| static exit_handle_fn arm_exit_handlers[] = { | ||
| [HSR_EC_WFI] = kvm_handle_wfi, | ||
| [HSR_EC_CP15_32] = kvm_handle_cp15_32, | ||
| [HSR_EC_CP15_64] = kvm_handle_cp15_64, | ||
| [HSR_EC_CP14_MR] = kvm_handle_cp14_access, | ||
| [HSR_EC_CP14_LS] = kvm_handle_cp14_load_store, | ||
| [HSR_EC_CP14_64] = kvm_handle_cp14_access, | ||
| [HSR_EC_CP_0_13] = kvm_handle_cp_0_13_access, | ||
| [HSR_EC_CP10_ID] = kvm_handle_cp10_id, | ||
| [HSR_EC_SVC_HYP] = handle_svc_hyp, | ||
| [HSR_EC_HVC] = handle_hvc, | ||
| [HSR_EC_SMC] = handle_smc, | ||
| [HSR_EC_IABT] = kvm_handle_guest_abort, | ||
| [HSR_EC_IABT_HYP] = handle_pabt_hyp, | ||
| [HSR_EC_DABT] = kvm_handle_guest_abort, | ||
| [HSR_EC_DABT_HYP] = handle_dabt_hyp, | ||
| }; | ||
|
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||
| static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu) | ||
| { | ||
| u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu); | ||
|
|
||
| if (hsr_ec >= ARRAY_SIZE(arm_exit_handlers) || | ||
| !arm_exit_handlers[hsr_ec]) { | ||
| kvm_err("Unkown exception class: hsr: %#08x\n", | ||
| (unsigned int)kvm_vcpu_get_hsr(vcpu)); | ||
| BUG(); | ||
| } | ||
|
|
||
| return arm_exit_handlers[hsr_ec]; | ||
| } | ||
|
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||
| /* | ||
| * Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on | ||
| * proper exit to userspace. | ||
| */ | ||
| int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run, | ||
| int exception_index) | ||
| { | ||
| exit_handle_fn exit_handler; | ||
|
|
||
| switch (exception_index) { | ||
| case ARM_EXCEPTION_IRQ: | ||
| return 1; | ||
| case ARM_EXCEPTION_UNDEFINED: | ||
| kvm_err("Undefined exception in Hyp mode at: %#08lx\n", | ||
| kvm_vcpu_get_hyp_pc(vcpu)); | ||
| BUG(); | ||
| panic("KVM: Hypervisor undefined exception!\n"); | ||
| case ARM_EXCEPTION_DATA_ABORT: | ||
| case ARM_EXCEPTION_PREF_ABORT: | ||
| case ARM_EXCEPTION_HVC: | ||
| /* | ||
| * See ARM ARM B1.14.1: "Hyp traps on instructions | ||
| * that fail their condition code check" | ||
| */ | ||
| if (!kvm_condition_valid(vcpu)) { | ||
| kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); | ||
| return 1; | ||
| } | ||
|
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| exit_handler = kvm_get_exit_handler(vcpu); | ||
|
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| return exit_handler(vcpu, run); | ||
| default: | ||
| kvm_pr_unimpl("Unsupported exception type: %d", | ||
| exception_index); | ||
| run->exit_reason = KVM_EXIT_INTERNAL_ERROR; | ||
| return 0; | ||
| } | ||
| } |