From a3508fbe9dc6dd3bece0c7bf889cc085a011738c Mon Sep 17 00:00:00 2001 From: David Hildenbrand Date: Wed, 8 Jul 2015 13:19:48 +0200 Subject: 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 Signed-off-by: David Hildenbrand Signed-off-by: Christian Borntraeger --- arch/s390/kvm/priv.c | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/s390/kvm/priv.c') diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c index 3db3be139992..c77ad2dc334f 100644 --- a/arch/s390/kvm/priv.c +++ b/arch/s390/kvm/priv.c @@ -719,6 +719,7 @@ static const intercept_handler_t b2_handlers[256] = { [0x10] = handle_set_prefix, [0x11] = handle_store_prefix, [0x12] = handle_store_cpu_address, + [0x14] = kvm_s390_handle_vsie, [0x21] = handle_ipte_interlock, [0x29] = handle_iske, [0x2a] = handle_rrbe, -- cgit v1.2.3