Release 4.14 arch/arm64/kvm/handle_exit.c
/*
* Copyright (C) 2012,2013 - ARM Ltd
* Author: Marc Zyngier <marc.zyngier@arm.com>
*
* Derived from arch/arm/kvm/handle_exit.c:
* 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, see <http://www.gnu.org/licenses/>.
*/
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <asm/esr.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_coproc.h>
#include <asm/kvm_emulate.h>
#include <asm/kvm_mmu.h>
#include <asm/kvm_psci.h>
#define CREATE_TRACE_POINTS
#include "trace.h"
typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *);
static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
int ret;
trace_kvm_hvc_arm64(*vcpu_pc(vcpu), vcpu_get_reg(vcpu, 0),
kvm_vcpu_hvc_get_imm(vcpu));
vcpu->stat.hvc_exit_stat++;
ret = kvm_psci_call(vcpu);
if (ret < 0) {
kvm_inject_undefined(vcpu);
return 1;
}
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Marc Zyngier | 29 | 39.73% | 2 | 33.33% |
| Wei Huang | 20 | 27.40% | 1 | 16.67% |
| Anup Patel | 16 | 21.92% | 1 | 16.67% |
| Amit Tomar | 7 | 9.59% | 1 | 16.67% |
| Pavel Fedin | 1 | 1.37% | 1 | 16.67% |
| Total | 73 | 100.00% | 6 | 100.00% |
static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
kvm_inject_undefined(vcpu);
return 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Marc Zyngier | 24 | 100.00% | 1 | 100.00% |
| Total | 24 | 100.00% | 1 | 100.00% |
/*
* Guest access to FP/ASIMD registers are routed to this handler only
* when the system doesn't support FP/ASIMD.
*/
static int handle_no_fpsimd(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
kvm_inject_undefined(vcpu);
return 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Suzuki K. Poulose | 24 | 100.00% | 1 | 100.00% |
| Total | 24 | 100.00% | 1 | 100.00% |
/**
* kvm_handle_wfx - handle a wait-for-interrupts or wait-for-event
* instruction executed by a guest
*
* @vcpu: the vcpu pointer
*
* WFE: Yield the CPU and come back to this vcpu when the scheduler
* decides to.
* WFI: Simply call kvm_vcpu_block(), which will halt execution of
* world-switches and schedule other host processes until there is an
* incoming IRQ or FIQ to the VM.
*/
static int kvm_handle_wfx(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
if (kvm_vcpu_get_hsr(vcpu) & ESR_ELx_WFx_ISS_WFE) {
trace_kvm_wfx_arm64(*vcpu_pc(vcpu), true);
vcpu->stat.wfe_exit_stat++;
kvm_vcpu_on_spin(vcpu, vcpu_mode_priv(vcpu));
} else {
trace_kvm_wfx_arm64(*vcpu_pc(vcpu), false);
vcpu->stat.wfi_exit_stat++;
kvm_vcpu_block(vcpu);
kvm_clear_request(KVM_REQ_UNHALT, vcpu);
}
kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
return 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Marc Zyngier | 38 | 37.62% | 2 | 22.22% |
| Wei Huang | 26 | 25.74% | 1 | 11.11% |
| Amit Tomar | 14 | 13.86% | 1 | 11.11% |
| Christoffer Dall | 10 | 9.90% | 1 | 11.11% |
| Andrew Jones | 7 | 6.93% | 1 | 11.11% |
| Longpeng( Mike) | 5 | 4.95% | 2 | 22.22% |
| Mark Rutland | 1 | 0.99% | 1 | 11.11% |
| Total | 101 | 100.00% | 9 | 100.00% |
/**
* kvm_handle_guest_debug - handle a debug exception instruction
*
* @vcpu: the vcpu pointer
* @run: access to the kvm_run structure for results
*
* We route all debug exceptions through the same handler. If both the
* guest and host are using the same debug facilities it will be up to
* userspace to re-inject the correct exception for guest delivery.
*
* @return: 0 (while setting run->exit_reason), -1 for error
*/
static int kvm_handle_guest_debug(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
u32 hsr = kvm_vcpu_get_hsr(vcpu);
int ret = 0;
run->exit_reason = KVM_EXIT_DEBUG;
run->debug.arch.hsr = hsr;
switch (ESR_ELx_EC(hsr)) {
case ESR_ELx_EC_WATCHPT_LOW:
run->debug.arch.far = vcpu->arch.fault.far_el2;
/* fall through */
case ESR_ELx_EC_SOFTSTP_LOW:
case ESR_ELx_EC_BREAKPT_LOW:
case ESR_ELx_EC_BKPT32:
case ESR_ELx_EC_BRK64:
break;
default:
kvm_err("%s: un-handled case hsr: %#08x\n",
__func__, (unsigned int) hsr);
ret = -1;
break;
}
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Bennée | 107 | 97.27% | 3 | 75.00% |
| Mark Rutland | 3 | 2.73% | 1 | 25.00% |
| Total | 110 | 100.00% | 4 | 100.00% |
static int kvm_handle_unknown_ec(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
u32 hsr = kvm_vcpu_get_hsr(vcpu);
kvm_pr_unimpl("Unknown exception class: hsr: %#08x -- %s\n",
hsr, esr_get_class_string(hsr));
kvm_inject_undefined(vcpu);
return 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mark Rutland | 44 | 100.00% | 1 | 100.00% |
| Total | 44 | 100.00% | 1 | 100.00% |
static exit_handle_fn arm_exit_handlers[] = {
[0 ... ESR_ELx_EC_MAX] = kvm_handle_unknown_ec,
[ESR_ELx_EC_WFx] = kvm_handle_wfx,
[ESR_ELx_EC_CP15_32] = kvm_handle_cp15_32,
[ESR_ELx_EC_CP15_64] = kvm_handle_cp15_64,
[ESR_ELx_EC_CP14_MR] = kvm_handle_cp14_32,
[ESR_ELx_EC_CP14_LS] = kvm_handle_cp14_load_store,
[ESR_ELx_EC_CP14_64] = kvm_handle_cp14_64,
[ESR_ELx_EC_HVC32] = handle_hvc,
[ESR_ELx_EC_SMC32] = handle_smc,
[ESR_ELx_EC_HVC64] = handle_hvc,
[ESR_ELx_EC_SMC64] = handle_smc,
[ESR_ELx_EC_SYS64] = kvm_handle_sys_reg,
[ESR_ELx_EC_IABT_LOW] = kvm_handle_guest_abort,
[ESR_ELx_EC_DABT_LOW] = kvm_handle_guest_abort,
[ESR_ELx_EC_SOFTSTP_LOW]= kvm_handle_guest_debug,
[ESR_ELx_EC_WATCHPT_LOW]= kvm_handle_guest_debug,
[ESR_ELx_EC_BREAKPT_LOW]= kvm_handle_guest_debug,
[ESR_ELx_EC_BKPT32] = kvm_handle_guest_debug,
[ESR_ELx_EC_BRK64] = kvm_handle_guest_debug,
[ESR_ELx_EC_FP_ASIMD] = handle_no_fpsimd,
};
static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu)
{
u32 hsr = kvm_vcpu_get_hsr(vcpu);
u8 hsr_ec = ESR_ELx_EC(hsr);
return arm_exit_handlers[hsr_ec];
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Marc Zyngier | 22 | 66.67% | 1 | 33.33% |
| Mark Rutland | 11 | 33.33% | 2 | 66.67% |
| Total | 33 | 100.00% | 3 | 100.00% |
/*
* 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;
if (ARM_SERROR_PENDING(exception_index)) {
u8 hsr_ec = ESR_ELx_EC(kvm_vcpu_get_hsr(vcpu));
/*
* HVC/SMC already have an adjusted PC, which we need
* to correct in order to return to after having
* injected the SError.
*/
if (hsr_ec == ESR_ELx_EC_HVC32 || hsr_ec == ESR_ELx_EC_HVC64 ||
hsr_ec == ESR_ELx_EC_SMC32 || hsr_ec == ESR_ELx_EC_SMC64) {
u32 adj = kvm_vcpu_trap_il_is32bit(vcpu) ? 4 : 2;
*vcpu_pc(vcpu) -= adj;
}
kvm_inject_vabt(vcpu);
return 1;
}
exception_index = ARM_EXCEPTION_CODE(exception_index);
switch (exception_index) {
case ARM_EXCEPTION_IRQ:
return 1;
case ARM_EXCEPTION_EL1_SERROR:
kvm_inject_vabt(vcpu);
return 1;
case ARM_EXCEPTION_TRAP:
/*
* 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;
}
exit_handler = kvm_get_exit_handler(vcpu);
return exit_handler(vcpu, run);
case ARM_EXCEPTION_HYP_GONE:
/*
* EL2 has been reset to the hyp-stub. This happens when a guest
* is pre-empted by kvm_reboot()'s shutdown call.
*/
run->exit_reason = KVM_EXIT_FAIL_ENTRY;
return 0;
default:
kvm_pr_unimpl("Unsupported exception type: %d",
exception_index);
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
return 0;
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Marc Zyngier | 179 | 93.23% | 3 | 75.00% |
| James Morse | 13 | 6.77% | 1 | 25.00% |
| Total | 192 | 100.00% | 4 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Marc Zyngier | 403 | 51.60% | 8 | 32.00% |
| Alex Bennée | 138 | 17.67% | 3 | 12.00% |
| Mark Rutland | 84 | 10.76% | 4 | 16.00% |
| Wei Huang | 52 | 6.66% | 1 | 4.00% |
| Suzuki K. Poulose | 31 | 3.97% | 1 | 4.00% |
| Amit Tomar | 21 | 2.69% | 1 | 4.00% |
| Anup Patel | 16 | 2.05% | 1 | 4.00% |
| James Morse | 13 | 1.66% | 1 | 4.00% |
| Christoffer Dall | 10 | 1.28% | 1 | 4.00% |
| Andrew Jones | 7 | 0.90% | 1 | 4.00% |
| Longpeng( Mike) | 5 | 0.64% | 2 | 8.00% |
| Pavel Fedin | 1 | 0.13% | 1 | 4.00% |
| Total | 781 | 100.00% | 25 | 100.00% |
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