Commit 572c0826 authored by Christian Borntraeger's avatar Christian Borntraeger Committed by Cornelia Huck
Browse files

s390x: Add unpack facility feature to GA1 



The unpack facility is an indication that diagnose 308 subcodes 8-10
are available to the guest. That means, that the guest can put itself
into protected mode.

Once it is in protected mode, the hardware stops any attempt of VM
introspection by the hypervisor.

Some features are currently not supported in protected mode:
     * vfio devices
     * Migration
     * Huge page backings

Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: default avatarJanosch Frank <frankja@linux.ibm.com>
Reviewed-by: default avatarDavid Hildenbrand <david@redhat.com>
Reviewed-by: default avatarClaudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: default avatarCornelia Huck <cohuck@redhat.com>
Message-Id: <20200319131921.2367-17-frankja@linux.ibm.com>
Signed-off-by: default avatarCornelia Huck <cohuck@redhat.com>
parent 42fc5eae

target/s390x/gen-features.c

+1 −0
Original line number Diff line number Diff line
@@ -562,6 +562,7 @@ static uint16_t full_GEN15_GA1[] = { 
    S390_FEAT_GROUP_MSA_EXT_9,

    S390_FEAT_GROUP_MSA_EXT_9_PCKMO,

    S390_FEAT_ETOKEN,

    S390_FEAT_UNPACK,

};



/* Default features (in order of release)

target/s390x/kvm.c

+8 −0
Original line number Diff line number Diff line
@@ -2425,6 +2425,14 @@ void kvm_s390_get_host_cpu_model(S390CPUModel *model, Error **errp) 
        clear_bit(S390_FEAT_BPB, model->features);

    }



    /*

     * If we have support for protected virtualization, indicate

     * the protected virtualization IPL unpack facility.

     */

    if (cap_protected) {

        set_bit(S390_FEAT_UNPACK, model->features);

    }



    /* We emulate a zPCI bus and AEN, therefore we don't need HW support */

    set_bit(S390_FEAT_ZPCI, model->features);

    set_bit(S390_FEAT_ADAPTER_EVENT_NOTIFICATION, model->features);