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 <borntraeger@de.ibm.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 217ce44395a4e7978194a7c9cc042bad1f84e889..e00accf9523e60e24136bb2cae466a627906bb91 100644 (file)
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -677,6 +677,14 @@ int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
        } else
                prefix = 0;
 
+       /*
+        * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy
+        * copying in vcpu load/put. Lets update our copies before we save
+        * it into the save area
+        */
+       save_fp_regs(&vcpu->arch.guest_fpregs);
+       save_access_regs(vcpu->run->s.regs.acrs);
+
        if (__guestcopy(vcpu, addr + offsetof(struct save_area, fp_regs),
                        vcpu->arch.guest_fpregs.fprs, 128, prefix))
                return -EFAULT;