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authorDavid Hildenbrand <dahi@linux.vnet.ibm.com>2015-07-08 14:19:48 +0300
committerChristian Borntraeger <borntraeger@de.ibm.com>2016-06-21 10:43:33 +0300
commita3508fbe9dc6dd3bece0c7bf889cc085a011738c (patch)
treef955df7a6d940b1e80170386857252f02a386d7f /arch/s390/include/uapi
parentdf9b2b4a4aa49f874f8507680a533369e4b9c378 (diff)
downloadlinux-a3508fbe9dc6dd3bece0c7bf889cc085a011738c.tar.xz
KVM: s390: vsie: initial support for nested virtualization
This patch adds basic support for nested virtualization on s390x, called VSIE (virtual SIE) and allows it to be used by the guest if the necessary facilities are supported by the hardware and enabled for the guest. In order to make this work, we have to shadow the sie control block provided by guest 2. In order to gain some performance, we have to reuse the same shadow blocks as good as possible. For now, we allow as many shadow blocks as we have VCPUs (that way, every VCPU can run the VSIE concurrently). We have to watch out for the prefix getting unmapped out of our shadow gmap and properly get the VCPU out of VSIE in that case, to fault the prefix pages back in. We use the PROG_REQUEST bit for that purpose. This patch is based on an initial prototype by Tobias Elpelt. Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/include/uapi')
-rw-r--r--arch/s390/include/uapi/asm/kvm.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/include/uapi/asm/kvm.h b/arch/s390/include/uapi/asm/kvm.h
index f0818d70d73d..62423b1931c0 100644
--- a/arch/s390/include/uapi/asm/kvm.h
+++ b/arch/s390/include/uapi/asm/kvm.h
@@ -98,6 +98,7 @@ struct kvm_s390_vm_cpu_machine {
#define KVM_S390_VM_CPU_FEAT_NR_BITS 1024
#define KVM_S390_VM_CPU_FEAT_ESOP 0
+#define KVM_S390_VM_CPU_FEAT_SIEF2 1
struct kvm_s390_vm_cpu_feat {
__u64 feat[16];
};