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KVM: async_pf: Async page fault support on s390

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This patch enables async page faults for s390 kvm guests.
It provides the userspace API to enable and disable_wait this feature.
The disable_wait will enforce that the feature is off by waiting on it.
Also it includes the diagnose code, called by the guest to enable async page faults.

The async page faults will use an already existing guest interface for this
purpose, as described in "CP Programming Services (SC24-6084)".

Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Dominik Dingel
2013-10-07 17:11:48 +02:00
committed by Christian Borntraeger
parent 9f2ceda49c
commit 3c038e6be0
12 changed files with 326 additions and 9 deletions
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7
arch/s390/kvm/sigp.c
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@@ -224,6 +224,8 @@ unlock:
static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
{
int rc;
unsigned int i;
struct kvm_vcpu *v;
switch (parameter & 0xff) {
case 0:
@@ -231,6 +233,11 @@ static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
break;
case 1:
case 2:
kvm_for_each_vcpu(i, v, vcpu->kvm) {
v->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
kvm_clear_async_pf_completion_queue(v);
}
rc = SIGP_CC_ORDER_CODE_ACCEPTED;
break;
default: