From 23a60f834406c8e3805328b630d09d5546b460c1 Mon Sep 17 00:00:00 2001 From: Collin Walling Date: Mon, 22 Jun 2020 11:46:36 -0400 Subject: s390/kvm: diagnose 0x318 sync and reset DIAGNOSE 0x318 (diag318) sets information regarding the environment the VM is running in (Linux, z/VM, etc) and is observed via firmware/service events. This is a privileged s390x instruction that must be intercepted by SIE. Userspace handles the instruction as well as migration. Data is communicated via VCPU register synchronization. The Control Program Name Code (CPNC) is stored in the SIE block. The CPNC along with the Control Program Version Code (CPVC) are stored in the kvm_vcpu_arch struct. This data is reset on load normal and clear resets. Signed-off-by: Collin Walling Reviewed-by: Janosch Frank Acked-by: Cornelia Huck Reviewed-by: David Hildenbrand Link: https://lore.kernel.org/r/20200622154636.5499-3-walling@linux.ibm.com [borntraeger@de.ibm.com: fix sync_reg position] Signed-off-by: Christian Borntraeger --- arch/s390/kvm/vsie.c | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/s390/kvm/vsie.c') diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c index 9e9056cebfcf..4f3cbf6003a9 100644 --- a/arch/s390/kvm/vsie.c +++ b/arch/s390/kvm/vsie.c @@ -548,6 +548,7 @@ static int shadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) scb_s->ecd |= scb_o->ecd & ECD_ETOKENF; scb_s->hpid = HPID_VSIE; + scb_s->cpnc = scb_o->cpnc; prepare_ibc(vcpu, vsie_page); rc = shadow_crycb(vcpu, vsie_page); -- cgit