From 39b9d4375b2ccdf7df13f94bbf29a308c90cd03f Mon Sep 17 00:00:00 2001 From: Christian Borntraeger Date: Fri, 25 Jan 2013 15:34:15 +0100 Subject: [PATCH] s390/kvm: Fix store status for ACRS/FPRS commit 15bc8d8457875f495c59d933b05770ba88d1eacb upstream. On store status we need to copy the current state of registers into a save area. Currently we might save stale versions: The sie state descriptor doesnt have fields for guest ACRS,FPRS, those registers are simply stored in the host registers. The host program must copy these away if needed. We do that in vcpu_put/load. If we now do a store status in KVM code between vcpu_put/load, the saved values are not up-to-date. Lets collect the ACRS/FPRS before saving them. This also fixes some strange problems with hotplug and virtio-ccw, since the low level machine check handler (on hotplug a machine check will happen) will revalidate all registers with the content of the save area. Signed-off-by: Christian Borntraeger Signed-off-by: Gleb Natapov [bwh: Backported to 3.2 as done in 3.0 by Jiri Slaby] Signed-off-by: Ben Hutchings Cc: Jiri Slaby --- Reading git-format-patch failed