680c1c6fd7
This introduces the alternative APIC device which makes use of KVM's in-kernel device model. External NMI injection via LINT1 is emulated by checking the current state of the in-kernel APIC, only injecting a NMI into the VCPU if LINT1 is unmasked and configured to DM_NMI. MSI is not yet supported, so we disable this when the in-kernel model is in use. CC: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
139 lines
4.1 KiB
C
139 lines
4.1 KiB
C
/*
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* KVM in-kernel APIC support
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*
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* Copyright (c) 2011 Siemens AG
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*
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* Authors:
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* Jan Kiszka <jan.kiszka@siemens.com>
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*
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* This work is licensed under the terms of the GNU GPL version 2.
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* See the COPYING file in the top-level directory.
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*/
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#include "hw/apic_internal.h"
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#include "kvm.h"
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static inline void kvm_apic_set_reg(struct kvm_lapic_state *kapic,
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int reg_id, uint32_t val)
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{
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*((uint32_t *)(kapic->regs + (reg_id << 4))) = val;
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}
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static inline uint32_t kvm_apic_get_reg(struct kvm_lapic_state *kapic,
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int reg_id)
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{
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return *((uint32_t *)(kapic->regs + (reg_id << 4)));
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}
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void kvm_put_apic_state(DeviceState *d, struct kvm_lapic_state *kapic)
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{
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APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);
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int i;
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memset(kapic, 0, sizeof(kapic));
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kvm_apic_set_reg(kapic, 0x2, s->id << 24);
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kvm_apic_set_reg(kapic, 0x8, s->tpr);
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kvm_apic_set_reg(kapic, 0xd, s->log_dest << 24);
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kvm_apic_set_reg(kapic, 0xe, s->dest_mode << 28 | 0x0fffffff);
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kvm_apic_set_reg(kapic, 0xf, s->spurious_vec);
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for (i = 0; i < 8; i++) {
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kvm_apic_set_reg(kapic, 0x10 + i, s->isr[i]);
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kvm_apic_set_reg(kapic, 0x18 + i, s->tmr[i]);
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kvm_apic_set_reg(kapic, 0x20 + i, s->irr[i]);
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}
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kvm_apic_set_reg(kapic, 0x28, s->esr);
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kvm_apic_set_reg(kapic, 0x30, s->icr[0]);
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kvm_apic_set_reg(kapic, 0x31, s->icr[1]);
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for (i = 0; i < APIC_LVT_NB; i++) {
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kvm_apic_set_reg(kapic, 0x32 + i, s->lvt[i]);
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}
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kvm_apic_set_reg(kapic, 0x38, s->initial_count);
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kvm_apic_set_reg(kapic, 0x3e, s->divide_conf);
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}
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void kvm_get_apic_state(DeviceState *d, struct kvm_lapic_state *kapic)
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{
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APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);
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int i, v;
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s->id = kvm_apic_get_reg(kapic, 0x2) >> 24;
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s->tpr = kvm_apic_get_reg(kapic, 0x8);
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s->arb_id = kvm_apic_get_reg(kapic, 0x9);
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s->log_dest = kvm_apic_get_reg(kapic, 0xd) >> 24;
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s->dest_mode = kvm_apic_get_reg(kapic, 0xe) >> 28;
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s->spurious_vec = kvm_apic_get_reg(kapic, 0xf);
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for (i = 0; i < 8; i++) {
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s->isr[i] = kvm_apic_get_reg(kapic, 0x10 + i);
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s->tmr[i] = kvm_apic_get_reg(kapic, 0x18 + i);
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s->irr[i] = kvm_apic_get_reg(kapic, 0x20 + i);
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}
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s->esr = kvm_apic_get_reg(kapic, 0x28);
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s->icr[0] = kvm_apic_get_reg(kapic, 0x30);
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s->icr[1] = kvm_apic_get_reg(kapic, 0x31);
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for (i = 0; i < APIC_LVT_NB; i++) {
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s->lvt[i] = kvm_apic_get_reg(kapic, 0x32 + i);
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}
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s->initial_count = kvm_apic_get_reg(kapic, 0x38);
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s->divide_conf = kvm_apic_get_reg(kapic, 0x3e);
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v = (s->divide_conf & 3) | ((s->divide_conf >> 1) & 4);
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s->count_shift = (v + 1) & 7;
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s->initial_count_load_time = qemu_get_clock_ns(vm_clock);
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apic_next_timer(s, s->initial_count_load_time);
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}
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static void kvm_apic_set_base(APICCommonState *s, uint64_t val)
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{
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s->apicbase = val;
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}
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static void kvm_apic_set_tpr(APICCommonState *s, uint8_t val)
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{
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s->tpr = (val & 0x0f) << 4;
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}
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static void do_inject_external_nmi(void *data)
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{
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APICCommonState *s = data;
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CPUState *env = s->cpu_env;
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uint32_t lvt;
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int ret;
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cpu_synchronize_state(env);
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lvt = s->lvt[APIC_LVT_LINT1];
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if (!(lvt & APIC_LVT_MASKED) && ((lvt >> 8) & 7) == APIC_DM_NMI) {
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ret = kvm_vcpu_ioctl(env, KVM_NMI);
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if (ret < 0) {
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fprintf(stderr, "KVM: injection failed, NMI lost (%s)\n",
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strerror(-ret));
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}
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}
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}
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static void kvm_apic_external_nmi(APICCommonState *s)
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{
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run_on_cpu(s->cpu_env, do_inject_external_nmi, s);
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}
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static void kvm_apic_init(APICCommonState *s)
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{
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memory_region_init_reservation(&s->io_memory, "kvm-apic-msi",
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MSI_SPACE_SIZE);
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}
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static APICCommonInfo kvm_apic_info = {
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.busdev.qdev.name = "kvm-apic",
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.init = kvm_apic_init,
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.set_base = kvm_apic_set_base,
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.set_tpr = kvm_apic_set_tpr,
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.external_nmi = kvm_apic_external_nmi,
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};
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static void kvm_apic_register_device(void)
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{
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apic_qdev_register(&kvm_apic_info);
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}
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device_init(kvm_apic_register_device)
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