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KVM: s390: factor out and fix setting of guest TOD clock

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Let's move that whole logic into one function. We now always use unsigned
values when calculating the epoch (to avoid over/underflow defined).
Also, we always have to get all VCPUs out of SIE before doing the update
to avoid running differing VCPUs with different TODs.

Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
David Hildenbrand 2015-05-12 09:49:14 +02:00 • committed by Christian Borntraeger
parent 5a3d883a59
commit 25ed167596
3 changed files with 21 additions and 23 deletions
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28
arch/s390/kvm/kvm-s390.c
View file

@ -521,22 +521,12 @@ static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
{
struct kvm_vcpu *cur_vcpu;
unsigned int vcpu_idx;
u64 gtod;
if (copy_from_user(&gtod, (void __user *)attr->addr, sizeof(gtod)))
return -EFAULT;
mutex_lock(&kvm->lock);
preempt_disable();
kvm->arch.epoch = gtod - get_tod_clock();
kvm_s390_vcpu_block_all(kvm);
kvm_for_each_vcpu(vcpu_idx, cur_vcpu, kvm)
cur_vcpu->arch.sie_block->epoch = kvm->arch.epoch;
kvm_s390_vcpu_unblock_all(kvm);
preempt_enable();
mutex_unlock(&kvm->lock);
kvm_s390_set_tod_clock(kvm, gtod);
VM_EVENT(kvm, 3, "SET: TOD base: 0x%llx\n", gtod);
return 0;
}
@ -1906,6 +1896,22 @@ retry:
return 0;
}
void kvm_s390_set_tod_clock(struct kvm *kvm, u64 tod)
{
struct kvm_vcpu *vcpu;
int i;
mutex_lock(&kvm->lock);
preempt_disable();
kvm->arch.epoch = tod - get_tod_clock();
kvm_s390_vcpu_block_all(kvm);
kvm_for_each_vcpu(i, vcpu, kvm)
vcpu->arch.sie_block->epoch = kvm->arch.epoch;
kvm_s390_vcpu_unblock_all(kvm);
preempt_enable();
mutex_unlock(&kvm->lock);
}
/**
* kvm_arch_fault_in_page - fault-in guest page if necessary
* @vcpu: The corresponding virtual cpu

1
arch/s390/kvm/kvm-s390.h
View file

@ -231,6 +231,7 @@ int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu);
int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu);
/* implemented in kvm-s390.c */
void kvm_s390_set_tod_clock(struct kvm *kvm, u64 tod);
long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable);
int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long addr);
int kvm_s390_store_adtl_status_unloaded(struct kvm_vcpu *vcpu,

15
arch/s390/kvm/priv.c
View file

@ -33,11 +33,9 @@
/* Handle SCK (SET CLOCK) interception */
static int handle_set_clock(struct kvm_vcpu *vcpu)
{
struct kvm_vcpu *cpup;
s64 val;
int i, rc;
int rc;
ar_t ar;
u64 op2;
u64 op2, val;
if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
@ -50,14 +48,7 @@ static int handle_set_clock(struct kvm_vcpu *vcpu)
return kvm_s390_inject_prog_cond(vcpu, rc);
VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", val);
mutex_lock(&vcpu->kvm->lock);
preempt_disable();
val = (val - get_tod_clock()) & ~0x3fUL;
kvm_for_each_vcpu(i, cpup, vcpu->kvm)
cpup->arch.sie_block->epoch = val;
preempt_enable();
mutex_unlock(&vcpu->kvm->lock);
kvm_s390_set_tod_clock(vcpu->kvm, val);
kvm_s390_set_psw_cc(vcpu, 0);
return 0;