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KVM: s390: introduce kvm_s390_vcpu_{start,stop}

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This patch introduces two new functions to set/clear the CPUSTAT_STOPPED bit and
makes use of it at all applicable places. These functions prepare the additional
execution of code when starting/stopping a vcpu.

The CPUSTAT_STOPPED bit should not be touched outside of these functions.

Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
David Hildenbrand 2014-03-14 10:59:29 +01:00 committed by Christian Borntraeger
parent e45efa28e5
commit 6852d7b69b
6 changed files with 40 additions and 6 deletions
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2
arch/s390/kvm/diag.c
View File

@ -176,7 +176,7 @@ static int __diag_ipl_functions(struct kvm_vcpu *vcpu)
return -EOPNOTSUPP;
}
atomic_set_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
kvm_s390_vcpu_stop(vcpu);
vcpu->run->s390_reset_flags |= KVM_S390_RESET_SUBSYSTEM;
vcpu->run->s390_reset_flags |= KVM_S390_RESET_IPL;
vcpu->run->s390_reset_flags |= KVM_S390_RESET_CPU_INIT;

3
arch/s390/kvm/intercept.c
View File

@ -65,8 +65,7 @@ static int handle_stop(struct kvm_vcpu *vcpu)
trace_kvm_s390_stop_request(vcpu->arch.local_int.action_bits);
if (vcpu->arch.local_int.action_bits & ACTION_STOP_ON_STOP) {
atomic_set_mask(CPUSTAT_STOPPED,
&vcpu->arch.sie_block->cpuflags);
kvm_s390_vcpu_stop(vcpu);
vcpu->arch.local_int.action_bits &= ~ACTION_STOP_ON_STOP;
VCPU_EVENT(vcpu, 3, "%s", "cpu stopped");
rc = -EOPNOTSUPP;

2
arch/s390/kvm/interrupt.c
View File

@ -413,7 +413,7 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
rc |= read_guest_lc(vcpu, offsetof(struct _lowcore, restart_psw),
&vcpu->arch.sie_block->gpsw,
sizeof(psw_t));
atomic_clear_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
kvm_s390_vcpu_start(vcpu);
break;
case KVM_S390_PROGRAM_INT:
VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",

16
arch/s390/kvm/kvm-s390.c
View File

@ -592,7 +592,7 @@ static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu)
vcpu->arch.sie_block->pp = 0;
vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
kvm_clear_async_pf_completion_queue(vcpu);
atomic_set_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
kvm_s390_vcpu_stop(vcpu);
kvm_s390_clear_local_irqs(vcpu);
}
@ -1235,7 +1235,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
if (vcpu->sigset_active)
sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
atomic_clear_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
kvm_s390_vcpu_start(vcpu);
switch (kvm_run->exit_reason) {
case KVM_EXIT_S390_SIEIC:
@ -1362,6 +1362,18 @@ int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
return kvm_s390_store_status_unloaded(vcpu, addr);
}
void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu)
{
trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1);
atomic_clear_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
}
void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu)
{
trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0);
atomic_set_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
}
static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
struct kvm_enable_cap *cap)
{

2
arch/s390/kvm/kvm-s390.h
View File

@ -157,6 +157,8 @@ int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu);
/* implemented in kvm-s390.c */
int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long addr);
int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr);
void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu);
void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu);
void s390_vcpu_block(struct kvm_vcpu *vcpu);
void s390_vcpu_unblock(struct kvm_vcpu *vcpu);
void exit_sie(struct kvm_vcpu *vcpu);

21
arch/s390/kvm/trace-s390.h
View File

@ -67,6 +67,27 @@ TRACE_EVENT(kvm_s390_destroy_vcpu,
TP_printk("destroy cpu %d", __entry->id)
);
/*
* Trace point for start and stop of vpcus.
*/
TRACE_EVENT(kvm_s390_vcpu_start_stop,
TP_PROTO(unsigned int id, int state),
TP_ARGS(id, state),
TP_STRUCT__entry(
__field(unsigned int, id)
__field(int, state)
),
TP_fast_assign(
__entry->id = id;
__entry->state = state;
),
TP_printk("%s cpu %d", __entry->state ? "starting" : "stopping",
__entry->id)
);
/*
* Trace points for injection of interrupts, either per machine or
* per vcpu.