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| author | Christian Borntraeger <borntraeger@de.ibm.com> | 2020-02-03 11:13:37 +0300 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2020-02-27 21:47:11 +0300 |
| commit | 0890ddea1a90e57114b5704cd560192c743f3d2e (patch) | |
| tree | 82863d7a9bed30729220bd9a5ae8fc23b349496a /arch/s390/kvm/kvm-s390.c | |
| parent | 201ae986ead7582f8d9506a5d11459b280b954c8 (diff) | |
| download | linux-0890ddea1a90e57114b5704cd560192c743f3d2e.tar.xz | |
KVM: s390: protvirt: Add SCLP interrupt handling
The sclp interrupt is kind of special. The ultravisor polices that we
do not inject an sclp interrupt with payload if no sccb is outstanding.
On the other hand we have "asynchronous" event interrupts, e.g. for
console input.
We separate both variants into sclp interrupt and sclp event interrupt.
The sclp interrupt is masked until a previous servc instruction has
finished (sie exit 108).
[frankja@linux.ibm.com: factoring out write_sclp]
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/kvm/kvm-s390.c')
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index bf61f48e9a3d..2881151fd773 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -2247,6 +2247,9 @@ static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd) r = kvm_s390_cpus_to_pv(kvm, &cmd->rc, &cmd->rrc); if (r) kvm_s390_pv_deinit_vm(kvm, &dummy, &dummy); + + /* we need to block service interrupts from now on */ + set_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs); break; } case KVM_PV_DISABLE: { @@ -2263,6 +2266,9 @@ static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd) if (r) break; r = kvm_s390_pv_deinit_vm(kvm, &cmd->rc, &cmd->rrc); + + /* no need to block service interrupts any more */ + clear_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs); break; } case KVM_PV_SET_SEC_PARMS: { |