On 03.12.18 10:21, Cornelia Huck wrote:
On Fri, 30 Nov 2018 15:32:13 +0100
Michael Mueller <mimu@xxxxxxxxxxxxx> wrote:
Add the IAM (Interruption Alert Mask) to the architectue specific
s/architectue/architecture/
tx
kvm struct. This mask in the GISA is used to define for which ISC
a GIB alert can be issued.
The functions kvm_s390_gisc_register() and kvm_s390_gisc_unregister()
are used to (un)register a GISC (guest ISC) with a virtual machine and
its GISA.
Add a note that these interfaces are supposed to be used by the
different adapter interrupt users like AP or PCI?
makes sense
Upon successful completion, kvm_s390_gisc_register() returns the
ISC to be used for GIB alert interruptions. A negative return code
indicates an error during registration.
Signed-off-by: Michael Mueller <mimu@xxxxxxxxxxxxx>
Reviewed-by: Pierre Morel <pmorel@xxxxxxxxxxxxx>
---
arch/s390/include/asm/kvm_host.h | 6 ++++++
arch/s390/kvm/interrupt.c | 44 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 50 insertions(+)
+int kvm_s390_gisc_unregister(struct kvm *kvm, u32 gisc)
+{
+ int rc = 0;
+
+ if (!kvm->arch.gib_in_use)
+ return -ENODEV;
+ if (gisc > MAX_ISC)
+ return -EINVAL;
+
+ spin_lock(&kvm->arch.iam_ref_lock);
+ if (kvm->arch.iam_ref_count[gisc] == 0) {
+ rc = -EFAULT;
-EFAULT looks odd. -EINVAL?
sure
+ goto out;
+ }
+ kvm->arch.iam_ref_count[gisc]--;
+ if (kvm->arch.iam_ref_count[gisc] == 0)
+ kvm->arch.iam &= ~(0x80 >> gisc);
+out:
+ spin_unlock(&kvm->arch.iam_ref_lock);
+
+ return rc;
+}
+EXPORT_SYMBOL_GPL(kvm_s390_gisc_unregister);
+
void kvm_s390_gib_destroy(void)
{
if (!gib)
--
Mit freundlichen Grüßen / Kind regards
Michael Müller
IBM Deutschland Research & Development GmbH
Vorsitzender des Aufsichtsrats: Martina Köderitz
Geschäftsführung: Dirk Wittkopp
Sitz der Gesellschaft: Böblingen
Registergericht: Amtsgericht Stuttgart, HRB 243294
