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[Qemu-devel] [PATCH 18/20] kvm: x86: Add user space part for in-kernel i
From: |
Marcelo Tosatti |
Subject: |
[Qemu-devel] [PATCH 18/20] kvm: x86: Add user space part for in-kernel i8259 |
Date: |
Fri, 20 Jan 2012 15:26:44 -0200 |
From: Jan Kiszka <address@hidden>
Introduce the alternative 'kvm-i8259' device model that exploits KVM
in-kernel acceleration.
The PIIX3 initialization code is furthermore extended by KVM specific
IRQ route setup. GSI injection differs in KVM mode from the user space
model. As we can dispatch ISA-range IRQs to both IOAPIC and PIC inside
the kernel, we do not need to inject them separately. This is reflected
by a KVM-specific GSI handler.
Signed-off-by: Jan Kiszka <address@hidden>
---
Makefile.target | 2 +-
hw/kvm/i8259.c | 128 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
hw/pc.h | 1 +
hw/pc_piix.c | 52 ++++++++++++++++++++--
4 files changed, 178 insertions(+), 5 deletions(-)
create mode 100644 hw/kvm/i8259.c
diff --git a/Makefile.target b/Makefile.target
index 1a63a1c..701073d 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -233,7 +233,7 @@ obj-i386-y += vmport.o
obj-i386-y += pci-hotplug.o smbios.o wdt_ib700.o
obj-i386-y += debugcon.o multiboot.o
obj-i386-y += pc_piix.o
-obj-i386-$(CONFIG_KVM) += kvm/clock.o kvm/apic.o
+obj-i386-$(CONFIG_KVM) += kvm/clock.o kvm/apic.o kvm/i8259.o
obj-i386-$(CONFIG_SPICE) += qxl.o qxl-logger.o qxl-render.o
# shared objects
diff --git a/hw/kvm/i8259.c b/hw/kvm/i8259.c
new file mode 100644
index 0000000..64bb5c2
--- /dev/null
+++ b/hw/kvm/i8259.c
@@ -0,0 +1,128 @@
+/*
+ * KVM in-kernel PIC (i8259) support
+ *
+ * Copyright (c) 2011 Siemens AG
+ *
+ * Authors:
+ * Jan Kiszka <address@hidden>
+ *
+ * This work is licensed under the terms of the GNU GPL version 2.
+ * See the COPYING file in the top-level directory.
+ */
+#include "hw/i8259_internal.h"
+#include "hw/apic_internal.h"
+#include "kvm.h"
+
+static void kvm_pic_get(PICCommonState *s)
+{
+ struct kvm_irqchip chip;
+ struct kvm_pic_state *kpic;
+ int ret;
+
+ chip.chip_id = s->master ? KVM_IRQCHIP_PIC_MASTER : KVM_IRQCHIP_PIC_SLAVE;
+ ret = kvm_vm_ioctl(kvm_state, KVM_GET_IRQCHIP, &chip);
+ if (ret < 0) {
+ fprintf(stderr, "KVM_GET_IRQCHIP failed: %s\n", strerror(ret));
+ abort();
+ }
+
+ kpic = &chip.chip.pic;
+
+ s->last_irr = kpic->last_irr;
+ s->irr = kpic->irr;
+ s->imr = kpic->imr;
+ s->isr = kpic->isr;
+ s->priority_add = kpic->priority_add;
+ s->irq_base = kpic->irq_base;
+ s->read_reg_select = kpic->read_reg_select;
+ s->poll = kpic->poll;
+ s->special_mask = kpic->special_mask;
+ s->init_state = kpic->init_state;
+ s->auto_eoi = kpic->auto_eoi;
+ s->rotate_on_auto_eoi = kpic->rotate_on_auto_eoi;
+ s->special_fully_nested_mode = kpic->special_fully_nested_mode;
+ s->init4 = kpic->init4;
+ s->elcr = kpic->elcr;
+ s->elcr_mask = kpic->elcr_mask;
+}
+
+static void kvm_pic_put(PICCommonState *s)
+{
+ struct kvm_irqchip chip;
+ struct kvm_pic_state *kpic;
+ int ret;
+
+ chip.chip_id = s->master ? KVM_IRQCHIP_PIC_MASTER : KVM_IRQCHIP_PIC_SLAVE;
+
+ kpic = &chip.chip.pic;
+
+ kpic->last_irr = s->last_irr;
+ kpic->irr = s->irr;
+ kpic->imr = s->imr;
+ kpic->isr = s->isr;
+ kpic->priority_add = s->priority_add;
+ kpic->irq_base = s->irq_base;
+ kpic->read_reg_select = s->read_reg_select;
+ kpic->poll = s->poll;
+ kpic->special_mask = s->special_mask;
+ kpic->init_state = s->init_state;
+ kpic->auto_eoi = s->auto_eoi;
+ kpic->rotate_on_auto_eoi = s->rotate_on_auto_eoi;
+ kpic->special_fully_nested_mode = s->special_fully_nested_mode;
+ kpic->init4 = s->init4;
+ kpic->elcr = s->elcr;
+ kpic->elcr_mask = s->elcr_mask;
+
+ ret = kvm_vm_ioctl(kvm_state, KVM_SET_IRQCHIP, &chip);
+ if (ret < 0) {
+ fprintf(stderr, "KVM_GET_IRQCHIP failed: %s\n", strerror(ret));
+ abort();
+ }
+}
+
+static void kvm_pic_reset(DeviceState *dev)
+{
+ PICCommonState *s = DO_UPCAST(PICCommonState, dev.qdev, dev);
+
+ pic_reset_common(s);
+ s->elcr = 0;
+
+ kvm_pic_put(s);
+}
+
+static void kvm_pic_set_irq(void *opaque, int irq, int level)
+{
+ int delivered;
+
+ delivered = kvm_irqchip_set_irq(kvm_state, irq, level);
+ apic_report_irq_delivered(delivered);
+}
+
+static void kvm_pic_init(PICCommonState *s)
+{
+ memory_region_init_reservation(&s->base_io, "kvm-pic", 2);
+ memory_region_init_reservation(&s->elcr_io, "kvm-elcr", 1);
+}
+
+qemu_irq *kvm_i8259_init(ISABus *bus)
+{
+ i8259_init_chip("kvm-i8259", bus, true);
+ i8259_init_chip("kvm-i8259", bus, false);
+
+ return qemu_allocate_irqs(kvm_pic_set_irq, NULL, ISA_NUM_IRQS);
+}
+
+static PICCommonInfo kvm_i8259_info = {
+ .isadev.qdev.name = "kvm-i8259",
+ .isadev.qdev.reset = kvm_pic_reset,
+ .init = kvm_pic_init,
+ .pre_save = kvm_pic_get,
+ .post_load = kvm_pic_put,
+};
+
+static void kvm_pic_register(void)
+{
+ pic_qdev_register(&kvm_i8259_info);
+}
+
+device_init(kvm_pic_register)
diff --git a/hw/pc.h b/hw/pc.h
index ece069a..5e913db 100644
--- a/hw/pc.h
+++ b/hw/pc.h
@@ -64,6 +64,7 @@ bool parallel_mm_init(MemoryRegion *address_space,
extern DeviceState *isa_pic;
qemu_irq *i8259_init(ISABus *bus, qemu_irq parent_irq);
+qemu_irq *kvm_i8259_init(ISABus *bus);
int pic_read_irq(DeviceState *d);
int pic_get_output(DeviceState *d);
void pic_info(Monitor *mon);
diff --git a/hw/pc_piix.c b/hw/pc_piix.c
index cde810d..297c04a 100644
--- a/hw/pc_piix.c
+++ b/hw/pc_piix.c
@@ -53,6 +53,42 @@ static const int ide_iobase[MAX_IDE_BUS] = { 0x1f0, 0x170 };
static const int ide_iobase2[MAX_IDE_BUS] = { 0x3f6, 0x376 };
static const int ide_irq[MAX_IDE_BUS] = { 14, 15 };
+static void kvm_piix3_setup_irq_routing(bool pci_enabled)
+{
+#ifdef CONFIG_KVM
+ KVMState *s = kvm_state;
+ int ret, i;
+
+ if (kvm_check_extension(s, KVM_CAP_IRQ_ROUTING)) {
+ for (i = 0; i < 8; ++i) {
+ if (i == 2) {
+ continue;
+ }
+ kvm_irqchip_add_route(s, i, KVM_IRQCHIP_PIC_MASTER, i);
+ }
+ for (i = 8; i < 16; ++i) {
+ kvm_irqchip_add_route(s, i, KVM_IRQCHIP_PIC_SLAVE, i - 8);
+ }
+ ret = kvm_irqchip_commit_routes(s);
+ if (ret < 0) {
+ hw_error("KVM IRQ routing setup failed");
+ }
+ }
+#endif /* CONFIG_KVM */
+}
+
+static void kvm_piix3_gsi_handler(void *opaque, int n, int level)
+{
+ GSIState *s = opaque;
+
+ if (n < ISA_NUM_IRQS) {
+ /* Kernel will forward to both PIC and IOAPIC */
+ qemu_set_irq(s->i8259_irq[n], level);
+ } else {
+ qemu_set_irq(s->ioapic_irq[n], level);
+ }
+}
+
static void ioapic_init(GSIState *gsi_state)
{
DeviceState *dev;
@@ -134,7 +170,13 @@ static void pc_init1(MemoryRegion *system_memory,
}
gsi_state = g_malloc0(sizeof(*gsi_state));
- gsi = qemu_allocate_irqs(gsi_handler, gsi_state, GSI_NUM_PINS);
+ if (kvm_enabled() && kvm_irqchip_in_kernel()) {
+ kvm_piix3_setup_irq_routing(pci_enabled);
+ gsi = qemu_allocate_irqs(kvm_piix3_gsi_handler, gsi_state,
+ GSI_NUM_PINS);
+ } else {
+ gsi = qemu_allocate_irqs(gsi_handler, gsi_state, GSI_NUM_PINS);
+ }
if (pci_enabled) {
pci_bus = i440fx_init(&i440fx_state, &piix3_devfn, &isa_bus, gsi,
@@ -154,11 +196,13 @@ static void pc_init1(MemoryRegion *system_memory,
}
isa_bus_irqs(isa_bus, gsi);
- if (!xen_enabled()) {
+ if (kvm_enabled() && kvm_irqchip_in_kernel()) {
+ i8259 = kvm_i8259_init(isa_bus);
+ } else if (xen_enabled()) {
+ i8259 = xen_interrupt_controller_init();
+ } else {
cpu_irq = pc_allocate_cpu_irq();
i8259 = i8259_init(isa_bus, cpu_irq[0]);
- } else {
- i8259 = xen_interrupt_controller_init();
}
for (i = 0; i < ISA_NUM_IRQS; i++) {
--
1.7.6.4
- [Qemu-devel] [PATCH 04/20] kvm: Move kvmclock into hw/kvm folder, (continued)
- [Qemu-devel] [PATCH 04/20] kvm: Move kvmclock into hw/kvm folder, Marcelo Tosatti, 2012/01/20
- [Qemu-devel] [PATCH 12/20] ioapic: Drop post-load irr initialization, Marcelo Tosatti, 2012/01/20
- [Qemu-devel] [PATCH 20/20] kvm: Activate in-kernel irqchip support, Marcelo Tosatti, 2012/01/20
- [Qemu-devel] [PATCH 06/20] apic: Inject external NMI events via LINT1, Marcelo Tosatti, 2012/01/20
- [Qemu-devel] [PATCH 03/20] msi: Generalize msix_supported to msi_supported, Marcelo Tosatti, 2012/01/20
- [Qemu-devel] [PATCH 17/20] kvm: x86: Add user space part for in-kernel APIC, Marcelo Tosatti, 2012/01/20
- [Qemu-devel] [PATCH 01/20] hyper-v: introduce Hyper-V support infrastructure., Marcelo Tosatti, 2012/01/20
- [Qemu-devel] [PATCH 08/20] apic: Factor out base class for KVM reuse, Marcelo Tosatti, 2012/01/20
- [Qemu-devel] [PATCH 11/20] i8259: Factor out base class for KVM reuse, Marcelo Tosatti, 2012/01/20
- [Qemu-devel] [PATCH 19/20] kvm: x86: Add user space part for in-kernel IOAPIC, Marcelo Tosatti, 2012/01/20
- [Qemu-devel] [PATCH 18/20] kvm: x86: Add user space part for in-kernel i8259,
Marcelo Tosatti <=
- [Qemu-devel] [PATCH 13/20] ioapic: Factor out base class for KVM reuse, Marcelo Tosatti, 2012/01/20
- Re: [Qemu-devel] [PATCH 00/20] [PULL] qemu-kvm.git uq/master queue, Anthony Liguori, 2012/01/23