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-rw-r--r--hw/s390x/s390-virtio-ccw.c4
-rw-r--r--hw/s390x/s390-virtio.c52
-rw-r--r--target-s390x/cpu.h34
-rw-r--r--target-s390x/kvm.c39
4 files changed, 129 insertions, 0 deletions
diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index dac00cec7c..eea0742b64 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -181,6 +181,10 @@ static void ccw_init(MachineState *machine)
/* Create VirtIO network adapters */
s390_create_virtio_net(BUS(css_bus), "virtio-net-ccw");
+
+ /* Register savevm handler for guest TOD clock */
+ register_savevm(NULL, "todclock", 0, 1,
+ gtod_save, gtod_load, kvm_state);
}
static void ccw_machine_class_init(ObjectClass *oc, void *data)
diff --git a/hw/s390x/s390-virtio.c b/hw/s390x/s390-virtio.c
index 412e49ba33..bdb538859f 100644
--- a/hw/s390x/s390-virtio.c
+++ b/hw/s390x/s390-virtio.c
@@ -38,6 +38,7 @@
#include "hw/s390x/sclp.h"
#include "hw/s390x/s390_flic.h"
#include "hw/s390x/s390-virtio.h"
+#include "cpu.h"
//#define DEBUG_S390
@@ -53,6 +54,9 @@
#define ZIPL_FILENAME "s390-zipl.rom"
#define TYPE_S390_MACHINE "s390-machine"
+#define S390_TOD_CLOCK_VALUE_MISSING 0x00
+#define S390_TOD_CLOCK_VALUE_PRESENT 0x01
+
static VirtIOS390Bus *s390_bus;
static S390CPU **ipi_states;
@@ -196,6 +200,51 @@ void s390_create_virtio_net(BusState *bus, const char *name)
}
}
+void gtod_save(QEMUFile *f, void *opaque)
+{
+ uint64_t tod_low;
+ uint8_t tod_high;
+ int r;
+
+ r = s390_get_clock(&tod_high, &tod_low);
+ if (r) {
+ fprintf(stderr, "WARNING: Unable to get guest clock for migration. "
+ "Error code %d. Guest clock will not be migrated "
+ "which could cause the guest to hang.\n", r);
+ qemu_put_byte(f, S390_TOD_CLOCK_VALUE_MISSING);
+ return;
+ }
+
+ qemu_put_byte(f, S390_TOD_CLOCK_VALUE_PRESENT);
+ qemu_put_byte(f, tod_high);
+ qemu_put_be64(f, tod_low);
+}
+
+int gtod_load(QEMUFile *f, void *opaque, int version_id)
+{
+ uint64_t tod_low;
+ uint8_t tod_high;
+ int r;
+
+ if (qemu_get_byte(f) == S390_TOD_CLOCK_VALUE_MISSING) {
+ fprintf(stderr, "WARNING: Guest clock was not migrated. This could "
+ "cause the guest to hang.\n");
+ return 0;
+ }
+
+ tod_high = qemu_get_byte(f);
+ tod_low = qemu_get_be64(f);
+
+ r = s390_set_clock(&tod_high, &tod_low);
+ if (r) {
+ fprintf(stderr, "WARNING: Unable to set guest clock value. "
+ "s390_get_clock returned error %d. This could cause "
+ "the guest to hang.\n", r);
+ }
+
+ return 0;
+}
+
/* PC hardware initialisation */
static void s390_init(MachineState *machine)
{
@@ -253,6 +302,9 @@ static void s390_init(MachineState *machine)
/* Create VirtIO network adapters */
s390_create_virtio_net((BusState *)s390_bus, "virtio-net-s390");
+
+ /* Register savevm handler for guest TOD clock */
+ register_savevm(NULL, "todclock", 0, 1, gtod_save, gtod_load, NULL);
}
void s390_nmi(NMIState *n, int cpu_index, Error **errp)
diff --git a/target-s390x/cpu.h b/target-s390x/cpu.h
index 0171de0179..8135dda318 100644
--- a/target-s390x/cpu.h
+++ b/target-s390x/cpu.h
@@ -401,6 +401,8 @@ void kvm_s390_vcpu_interrupt(S390CPU *cpu, struct kvm_s390_irq *irq);
void kvm_s390_floating_interrupt(struct kvm_s390_irq *irq);
int kvm_s390_inject_flic(struct kvm_s390_irq *irq);
void kvm_s390_access_exception(S390CPU *cpu, uint16_t code, uint64_t te_code);
+int kvm_s390_get_clock(uint8_t *tod_high, uint64_t *tod_clock);
+int kvm_s390_set_clock(uint8_t *tod_high, uint64_t *tod_clock);
#else
static inline void kvm_s390_virtio_irq(int config_change, uint64_t token)
{
@@ -408,11 +410,40 @@ static inline void kvm_s390_virtio_irq(int config_change, uint64_t token)
static inline void kvm_s390_service_interrupt(uint32_t parm)
{
}
+static inline int kvm_s390_get_clock(uint8_t *tod_high, uint64_t *tod_low)
+{
+ return -ENOSYS;
+}
+static inline int kvm_s390_set_clock(uint8_t *tod_high, uint64_t *tod_low)
+{
+ return -ENOSYS;
+}
static inline void kvm_s390_access_exception(S390CPU *cpu, uint16_t code,
uint64_t te_code)
{
}
#endif
+
+static inline int s390_get_clock(uint8_t *tod_high, uint64_t *tod_low)
+{
+ if (kvm_enabled()) {
+ return kvm_s390_get_clock(tod_high, tod_low);
+ }
+ /* Fixme TCG */
+ *tod_high = 0;
+ *tod_low = 0;
+ return 0;
+}
+
+static inline int s390_set_clock(uint8_t *tod_high, uint64_t *tod_low)
+{
+ if (kvm_enabled()) {
+ return kvm_s390_set_clock(tod_high, tod_low);
+ }
+ /* Fixme TCG */
+ return 0;
+}
+
S390CPU *s390_cpu_addr2state(uint16_t cpu_addr);
unsigned int s390_cpu_halt(S390CPU *cpu);
void s390_cpu_unhalt(S390CPU *cpu);
@@ -422,6 +453,9 @@ static inline uint8_t s390_cpu_get_state(S390CPU *cpu)
return cpu->env.cpu_state;
}
+void gtod_save(QEMUFile *f, void *opaque);
+int gtod_load(QEMUFile *f, void *opaque, int version_id);
+
/* service interrupts are floating therefore we must not pass an cpustate */
void s390_sclp_extint(uint32_t parm);
diff --git a/target-s390x/kvm.c b/target-s390x/kvm.c
index 896534bf95..b21a348805 100644
--- a/target-s390x/kvm.c
+++ b/target-s390x/kvm.c
@@ -486,6 +486,45 @@ int kvm_arch_get_registers(CPUState *cs)
return 0;
}
+int kvm_s390_get_clock(uint8_t *tod_high, uint64_t *tod_low)
+{
+ int r;
+ struct kvm_device_attr attr = {
+ .group = KVM_S390_VM_TOD,
+ .attr = KVM_S390_VM_TOD_LOW,
+ .addr = (uint64_t)tod_low,
+ };
+
+ r = kvm_vm_ioctl(kvm_state, KVM_GET_DEVICE_ATTR, &attr);
+ if (r) {
+ return r;
+ }
+
+ attr.attr = KVM_S390_VM_TOD_HIGH;
+ attr.addr = (uint64_t)tod_high;
+ return kvm_vm_ioctl(kvm_state, KVM_GET_DEVICE_ATTR, &attr);
+}
+
+int kvm_s390_set_clock(uint8_t *tod_high, uint64_t *tod_low)
+{
+ int r;
+
+ struct kvm_device_attr attr = {
+ .group = KVM_S390_VM_TOD,
+ .attr = KVM_S390_VM_TOD_LOW,
+ .addr = (uint64_t)tod_low,
+ };
+
+ r = kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attr);
+ if (r) {
+ return r;
+ }
+
+ attr.attr = KVM_S390_VM_TOD_HIGH;
+ attr.addr = (uint64_t)tod_high;
+ return kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attr);
+}
+
/*
* Legacy layout for s390:
* Older S390 KVM requires the topmost vma of the RAM to be
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-20 18:51:12 +0000