On 25.10.18 14:37, Michael Mueller wrote:
> The GIB (Guest Information Block) links the GISA of all guests
> that have adapter interrupts pending. These interrupts cannot be
> deliverd because no vcpu of these guests is currently running in
> SIE context. Instead, a GIB alert is issued on the host to schedule
> these guests to run.
>
> This mechanism allows to process adapter interrupts for currently
> not running guests.
>
> The GIB is created during host initialization and associated with
> the Adapter Interruption Facility in case an Adapter Interruption
> Virtualization Facility is available.
>
> Signed-off-by: Michael Mueller <mimu@xxxxxxxxxxxxx>
> ---
> /*
> * sie_page2 has to be allocated as DMA because fac_list, crycb and
> * gisa need 31bit addresses in the sie control block.
> @@ -829,6 +838,7 @@ struct kvm_arch{
> /* subset of available cpu features enabled by user space */
> DECLARE_BITMAP(cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
> struct kvm_s390_gisa *gisa;
> + int gib_in_use;
> };
That's a kvm wide value, right? But here we save it per VM.
Is that really necessary or am I missing something?
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