[libvirt] [PATCH v3 1/2] Add machine type pc-1.0-qemu-kvm for live migrate compatibility with qemu-kvm
Alex Bligh
alex at alex.org.uk
Sun Sep 21 14:38:58 UTC 2014
Add a machine type pc-1.0-qemu-kvm for live migrate compatibility
with qemu-kvm version 1.0.
Signed-off-by: Alex Bligh <alex at alex.org.uk>
---
hw/acpi/piix4.c | 47 +++++++++++++++++++++++++++++++++++++++++++++--
hw/i386/pc_piix.c | 30 ++++++++++++++++++++++++++++++
hw/timer/i8254_common.c | 10 +++++++++-
3 files changed, 84 insertions(+), 3 deletions(-)
diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c
index b72b34e..e016005 100644
--- a/hw/acpi/piix4.c
+++ b/hw/acpi/piix4.c
@@ -37,6 +37,8 @@
#include "hw/acpi/memory_hotplug.h"
#include "hw/acpi/acpi_dev_interface.h"
+extern int qemu_kvm_1_0_compat;
+
//#define DEBUG
#ifdef DEBUG
@@ -200,12 +202,24 @@ static const VMStateDescription vmstate_pci_status = {
}
};
+static const VMStateDescription vmstate_acpi_compat;
+
static int acpi_load_old(QEMUFile *f, void *opaque, int version_id)
{
PIIX4PMState *s = opaque;
int ret, i;
uint16_t temp;
+ /* If we are expecting the inbound migration to come from
+ * qemu-kvm 1.0, it will have a version_id of 2 but really
+ * be version 3, so call back the original vmstate_load_state
+ * with a different more tolerant vmstate descriptor
+ */
+ if ((version_id == 2) && (qemu_kvm_1_0_compat)) {
+ return vmstate_load_state(f, &vmstate_acpi_compat,
+ opaque, version_id);
+ }
+
ret = pci_device_load(PCI_DEVICE(s), f);
if (ret < 0) {
return ret;
@@ -267,8 +281,9 @@ static const VMStateDescription vmstate_memhp_state = {
};
/* qemu-kvm 1.2 uses version 3 but advertised as 2
- * To support incoming qemu-kvm 1.2 migration, change version_id
- * and minimum_version_id to 2 below (which breaks migration from
+ * To support incoming qemu-kvm 1.2 migration, we support
+ * via a command line option a change to minimum_version_id
+ * of 2 in a _compat structure (which breaks migration from
* qemu 1.2).
*
*/
@@ -307,6 +322,34 @@ static const VMStateDescription vmstate_acpi = {
}
};
+static const VMStateDescription vmstate_acpi_compat = {
+ .name = "piix4_pm",
+ .version_id = 3,
+ .minimum_version_id = 2,
+ .minimum_version_id_old = 1,
+ .load_state_old = NULL, /* to avoid recursion */
+ .post_load = vmstate_acpi_post_load,
+ .fields = (VMStateField[]) {
+ VMSTATE_PCI_DEVICE(parent_obj, PIIX4PMState),
+ VMSTATE_UINT16(ar.pm1.evt.sts, PIIX4PMState),
+ VMSTATE_UINT16(ar.pm1.evt.en, PIIX4PMState),
+ VMSTATE_UINT16(ar.pm1.cnt.cnt, PIIX4PMState),
+ VMSTATE_STRUCT(apm, PIIX4PMState, 0, vmstate_apm, APMState),
+ VMSTATE_TIMER(ar.tmr.timer, PIIX4PMState),
+ VMSTATE_INT64(ar.tmr.overflow_time, PIIX4PMState),
+ VMSTATE_STRUCT(ar.gpe, PIIX4PMState, 2, vmstate_gpe, ACPIGPE),
+ VMSTATE_STRUCT_TEST(
+ acpi_pci_hotplug.acpi_pcihp_pci_status[ACPI_PCIHP_BSEL_DEFAULT],
+ PIIX4PMState,
+ vmstate_test_no_use_acpi_pci_hotplug,
+ 2, vmstate_pci_status,
+ struct AcpiPciHpPciStatus),
+ VMSTATE_PCI_HOTPLUG(acpi_pci_hotplug, PIIX4PMState,
+ vmstate_test_use_acpi_pci_hotplug),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
static void piix4_reset(void *opaque)
{
PIIX4PMState *s = opaque;
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 7081c08..48a4942 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -70,6 +70,8 @@ static bool smbios_legacy_mode;
static bool gigabyte_align = true;
static bool has_reserved_memory = true;
+int qemu_kvm_1_0_compat;
+
/* PC hardware initialisation */
static void pc_init1(MachineState *machine,
int pci_enabled,
@@ -386,6 +388,14 @@ static void pc_init_pci_1_2(MachineState *machine)
pc_init_pci(machine);
}
+/* PC machine init function for qemu-kvm 1.0 */
+static void pc_init_pci_1_2_qemu_kvm(MachineState *machine)
+{
+ qemu_kvm_1_0_compat = 1;
+ pc_compat_1_2(machine);
+ pc_init_pci(machine);
+}
+
/* PC init function for pc-0.10 to pc-0.13 */
static void pc_init_pci_no_kvmclock(MachineState *machine)
{
@@ -644,6 +654,25 @@ static QEMUMachine pc_machine_v1_0 = {
.hw_version = "1.0",
};
+#define PC_COMPAT_1_0_QEMU_KVM \
+ PC_COMPAT_1_0,\
+ {\
+ .driver = "cirrus-vga",\
+ .property = "vgamem_mb",\
+ .value = stringify(16),\
+ }
+
+static QEMUMachine pc_machine_v1_0_qemu_kvm = {
+ PC_I440FX_1_2_MACHINE_OPTIONS,
+ .name = "pc-1.0-qemu-kvm",
+ .init = pc_init_pci_1_2_qemu_kvm,
+ .compat_props = (GlobalProperty[]) {
+ PC_COMPAT_1_0_QEMU_KVM,
+ { /* end of list */ }
+ },
+ .hw_version = "1.0",
+};
+
#define PC_COMPAT_0_15 \
PC_COMPAT_1_0
@@ -886,6 +915,7 @@ static void pc_machine_init(void)
qemu_register_pc_machine(&pc_machine_v1_2);
qemu_register_pc_machine(&pc_machine_v1_1);
qemu_register_pc_machine(&pc_machine_v1_0);
+ qemu_register_pc_machine(&pc_machine_v1_0_qemu_kvm);
qemu_register_pc_machine(&pc_machine_v0_15);
qemu_register_pc_machine(&pc_machine_v0_14);
qemu_register_pc_machine(&pc_machine_v0_13);
diff --git a/hw/timer/i8254_common.c b/hw/timer/i8254_common.c
index 07345f6..b4deead 100644
--- a/hw/timer/i8254_common.c
+++ b/hw/timer/i8254_common.c
@@ -29,6 +29,8 @@
#include "hw/timer/i8254.h"
#include "hw/timer/i8254_internal.h"
+extern int qemu_kvm_1_0_compat;
+
/* val must be 0 or 1 */
void pit_set_gate(ISADevice *dev, int channel, int val)
{
@@ -257,6 +259,11 @@ static int pit_dispatch_post_load(void *opaque, int version_id)
return 0;
}
+static bool has_irq_disabled(void *opaque, int version_id)
+{
+ return (version_id >= 3) || ((version_id == 2) && qemu_kvm_1_0_compat);
+}
+
static const VMStateDescription vmstate_pit_common = {
.name = "i8254",
.version_id = 3,
@@ -266,7 +273,8 @@ static const VMStateDescription vmstate_pit_common = {
.pre_save = pit_dispatch_pre_save,
.post_load = pit_dispatch_post_load,
.fields = (VMStateField[]) {
- VMSTATE_UINT32_V(channels[0].irq_disabled, PITCommonState, 3),
+ VMSTATE_UINT32_TEST(channels[0].irq_disabled, PITCommonState,
+ has_irq_disabled),
VMSTATE_STRUCT_ARRAY(channels, PITCommonState, 3, 2,
vmstate_pit_channel, PITChannelState),
VMSTATE_INT64(channels[0].next_transition_time,
--
1.7.9.5
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