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@xxxxxxxxxxxxxx>
Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
---
Makefile.target | 2 +-
hw/kvm/apic.c | 138 +++++++++++++++++++++++++++++++++++++++++++++++++++++
hw/pc.c | 15 ++++--
kvm.h | 4 ++
target-i386/kvm.c | 38 +++++++++++++++
5 files changed, 191 insertions(+), 6 deletions(-)
create mode 100644 hw/kvm/apic.c
diff --git a/Makefile.target b/Makefile.target
index 4fa91d3..5e5b5d1 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -228,7 +228,7 @@ obj-i386-y += vmport.o
obj-i386-y += device-hotplug.o pci-hotplug.o smbios.o wdt_ib700.o
obj-i386-y += debugcon.o multiboot.o
obj-i386-y += pc_piix.o
-obj-i386-$(CONFIG_KVM) += kvm/clock.o
+obj-i386-$(CONFIG_KVM) += kvm/clock.o kvm/apic.o
obj-i386-$(CONFIG_SPICE) += qxl.o qxl-logger.o qxl-render.o
# shared objects
diff --git a/hw/kvm/apic.c b/hw/kvm/apic.c
new file mode 100644
index 0000000..6300695
--- /dev/null
+++ b/hw/kvm/apic.c
@@ -0,0 +1,138 @@
+/*
+ * KVM in-kernel APIC support
+ *
+ * Copyright (c) 2011 Siemens AG
+ *
+ * Authors:
+ * Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
+ *
+ * This work is licensed under the terms of the GNU GPL version 2.
+ * See the COPYING file in the top-level directory.
+ */
+#include "hw/apic_internal.h"
+#include "kvm.h"
+
+static inline void kvm_apic_set_reg(struct kvm_lapic_state *kapic,
+ int reg_id, uint32_t val)
+{
+ *((uint32_t *)(kapic->regs + (reg_id << 4))) = val;
+}
+
+static inline uint32_t kvm_apic_get_reg(struct kvm_lapic_state *kapic,
+ int reg_id)
+{
+ return *((uint32_t *)(kapic->regs + (reg_id << 4)));
+}
+
+void kvm_put_apic_state(DeviceState *d, struct kvm_lapic_state *kapic)
+{
+ APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);
+ int i;
+
+ memset(kapic, 0, sizeof(kapic));
+ kvm_apic_set_reg(kapic, 0x2, s->id << 24);
+ kvm_apic_set_reg(kapic, 0x8, s->tpr);
+ kvm_apic_set_reg(kapic, 0xd, s->log_dest << 24);
+ kvm_apic_set_reg(kapic, 0xe, s->dest_mode << 28 | 0x0fffffff);
+ kvm_apic_set_reg(kapic, 0xf, s->spurious_vec);
+ for (i = 0; i < 8; i++) {
+ kvm_apic_set_reg(kapic, 0x10 + i, s->isr[i]);
+ kvm_apic_set_reg(kapic, 0x18 + i, s->tmr[i]);
+ kvm_apic_set_reg(kapic, 0x20 + i, s->irr[i]);
+ }
+ kvm_apic_set_reg(kapic, 0x28, s->esr);
+ kvm_apic_set_reg(kapic, 0x30, s->icr[0]);
+ kvm_apic_set_reg(kapic, 0x31, s->icr[1]);
+ for (i = 0; i < APIC_LVT_NB; i++) {
+ kvm_apic_set_reg(kapic, 0x32 + i, s->lvt[i]);
+ }
+ kvm_apic_set_reg(kapic, 0x38, s->initial_count);
+ kvm_apic_set_reg(kapic, 0x3e, s->divide_conf);
+}
+
+void kvm_get_apic_state(DeviceState *d, struct kvm_lapic_state *kapic)
+{
+ APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);
+ int i, v;
+
+ s->id = kvm_apic_get_reg(kapic, 0x2) >> 24;
+ s->tpr = kvm_apic_get_reg(kapic, 0x8);
+ s->arb_id = kvm_apic_get_reg(kapic, 0x9);
+ s->log_dest = kvm_apic_get_reg(kapic, 0xd) >> 24;
+ s->dest_mode = kvm_apic_get_reg(kapic, 0xe) >> 28;
+ s->spurious_vec = kvm_apic_get_reg(kapic, 0xf);
+ for (i = 0; i < 8; i++) {
+ s->isr[i] = kvm_apic_get_reg(kapic, 0x10 + i);
+ s->tmr[i] = kvm_apic_get_reg(kapic, 0x18 + i);
+ s->irr[i] = kvm_apic_get_reg(kapic, 0x20 + i);
+ }
+ s->esr = kvm_apic_get_reg(kapic, 0x28);
+ s->icr[0] = kvm_apic_get_reg(kapic, 0x30);
+ s->icr[1] = kvm_apic_get_reg(kapic, 0x31);
+ for (i = 0; i < APIC_LVT_NB; i++) {
+ s->lvt[i] = kvm_apic_get_reg(kapic, 0x32 + i);
+ }
+ s->initial_count = kvm_apic_get_reg(kapic, 0x38);
+ s->divide_conf = kvm_apic_get_reg(kapic, 0x3e);
+
+ v = (s->divide_conf & 3) | ((s->divide_conf >> 1) & 4);
+ s->count_shift = (v + 1) & 7;
+
+ s->initial_count_load_time = qemu_get_clock_ns(vm_clock);
+ apic_next_timer(s, s->initial_count_load_time);
+}
+
+static void kvm_apic_set_base(APICCommonState *s, uint64_t val)
+{
+ s->apicbase = val;
+}
+
+static void kvm_apic_set_tpr(APICCommonState *s, uint8_t val)
+{
+ s->tpr = (val & 0x0f) << 4;
+}
+
+static void do_inject_external_nmi(void *data)
+{
+ APICCommonState *s = data;
+ CPUState *env = s->cpu_env;
+ uint32_t lvt;
+ int ret;
+
+ cpu_synchronize_state(env);
+
+ lvt = s->lvt[APIC_LVT_LINT1];
+ if (!(lvt & APIC_LVT_MASKED) && ((lvt >> 8) & 7) == APIC_DM_NMI) {
+ ret = kvm_vcpu_ioctl(env, KVM_NMI);
+ if (ret < 0) {
+ fprintf(stderr, "KVM: injection failed, NMI lost (%s)\n",
+ strerror(-ret));
+ }
+ }
+}
+
+static void kvm_apic_external_nmi(APICCommonState *s)
+{
+ run_on_cpu(s->cpu_env, do_inject_external_nmi, s);
+}
+
+static void kvm_apic_init(APICCommonState *s)
+{
+ memory_region_init_reservation(&s->io_memory, "kvm-apic-msi",
+ MSI_SPACE_SIZE);
+}
+
+static APICCommonInfo kvm_apic_info = {
+ .busdev.qdev.name = "kvm-apic",
+ .init = kvm_apic_init,
+ .set_base = kvm_apic_set_base,
+ .set_tpr = kvm_apic_set_tpr,
+ .external_nmi = kvm_apic_external_nmi,
+};
+
+static void kvm_apic_register_device(void)
+{
+ apic_qdev_register(&kvm_apic_info);
+}
+
+device_init(kvm_apic_register_device)
diff --git a/hw/pc.c b/hw/pc.c
index 9519079..5f6ac8a 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -879,25 +879,30 @@ DeviceState *cpu_get_current_apic(void)
static DeviceState *apic_init(void *env, uint8_t apic_id)
{
DeviceState *dev;
- SysBusDevice *d;
static int apic_mapped;
- dev = qdev_create(NULL, "apic");
+ if (kvm_enabled() && kvm_irqchip_in_kernel()) {
+ dev = qdev_create(NULL, "kvm-apic");
+ } else {
+ dev = qdev_create(NULL, "apic");
+ }
qdev_prop_set_uint8(dev, "id", apic_id);
qdev_prop_set_ptr(dev, "cpu_env", env);
qdev_init_nofail(dev);
- d = sysbus_from_qdev(dev);
/* XXX: mapping more APICs at the same memory location */
if (apic_mapped == 0) {
/* NOTE: the APIC is directly connected to the CPU - it is not
on the global memory bus. */
/* XXX: what if the base changes? */
- sysbus_mmio_map(d, 0, MSI_ADDR_BASE);
+ sysbus_mmio_map(sysbus_from_qdev(dev), 0, MSI_ADDR_BASE);
apic_mapped = 1;
}
- msi_supported = true;
+ /* KVM does not support MSI yet. */
+ if (!kvm_enabled() || !kvm_irqchip_in_kernel()) {
+ msi_supported = true;
+ }
return dev;
}
diff --git a/kvm.h b/kvm.h
index a3c87af..f866296 100644
--- a/kvm.h
+++ b/kvm.h
@@ -31,6 +31,7 @@ extern int kvm_allowed;
#endif
struct kvm_run;
+struct kvm_lapic_state;
typedef struct KVMCapabilityInfo {
const char *name;
@@ -134,6 +135,9 @@ int kvm_irqchip_set_irq(KVMState *s, int irq, int level);
void kvm_irqchip_add_route(KVMState *s, int gsi, int irqchip, int pin);
int kvm_irqchip_commit_routes(KVMState *s);
+void kvm_put_apic_state(DeviceState *d, struct kvm_lapic_state *kapic);
+void kvm_get_apic_state(DeviceState *d, struct kvm_lapic_state *kapic);
+
struct kvm_guest_debug;
struct kvm_debug_exit_arch;
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 9d1191f..274b3cb 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -1277,6 +1277,36 @@ static int kvm_get_mp_state(CPUState *env)
return 0;
}
+static int kvm_get_apic(CPUState *env)
+{
+ DeviceState *apic = env->apic_state;
+ struct kvm_lapic_state kapic;
+ int ret;
+
+ if (apic && kvm_enabled() && kvm_irqchip_in_kernel()) {
+ ret = kvm_vcpu_ioctl(env, KVM_GET_LAPIC, &kapic);
+ if (ret < 0) {
+ return ret;
+ }
+
+ kvm_get_apic_state(apic, &kapic);
+ }
+ return 0;
+}
+
+static int kvm_put_apic(CPUState *env)
+{
+ DeviceState *apic = env->apic_state;
+ struct kvm_lapic_state kapic;
+
+ if (apic && kvm_enabled() && kvm_irqchip_in_kernel()) {
+ kvm_put_apic_state(apic, &kapic);
+
+ return kvm_vcpu_ioctl(env, KVM_SET_LAPIC, &kapic);
+ }
+ return 0;
+}
+
static int kvm_put_vcpu_events(CPUState *env, int level)
{
struct kvm_vcpu_events events;
@@ -1450,6 +1480,10 @@ int kvm_arch_put_registers(CPUState *env, int level)
if (ret < 0) {
return ret;
}
+ ret = kvm_put_apic(env);
+ if (ret < 0) {
+ return ret;
+ }
}
ret = kvm_put_vcpu_events(env, level);
if (ret < 0) {
@@ -1497,6 +1531,10 @@ int kvm_arch_get_registers(CPUState *env)
if (ret < 0) {
return ret;
}
+ ret = kvm_get_apic(env);
+ if (ret < 0) {
+ return ret;
+ }
ret = kvm_get_vcpu_events(env);
if (ret < 0) {
return ret;
--
1.7.3.4
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