KVM: s390: Machine Check

Store additional status in the machine check handler, in order to
collect status (such as vector registers) that is not defined by
store status.

Signed-off-by: Eric Farman <farman@linux.vnet.ibm.com>
Reviewed-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index c0ae03aa0dff..0c045cfdce9b 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2031,6 +2031,35 @@ int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
 	return kvm_s390_store_status_unloaded(vcpu, addr);
 }
 
+/*
+ * store additional status at address
+ */
+int kvm_s390_store_adtl_status_unloaded(struct kvm_vcpu *vcpu,
+					unsigned long gpa)
+{
+	/* Only bits 0-53 are used for address formation */
+	if (!(gpa & ~0x3ff))
+		return 0;
+
+	return write_guest_abs(vcpu, gpa & ~0x3ff,
+			       (void *)&vcpu->run->s.regs.vrs, 512);
+}
+
+int kvm_s390_vcpu_store_adtl_status(struct kvm_vcpu *vcpu, unsigned long addr)
+{
+	if (!test_kvm_facility(vcpu->kvm, 129))
+		return 0;
+
+	/*
+	 * The guest VXRS are in the host VXRs due to the lazy
+	 * copying in vcpu load/put. Let's update our copies before we save
+	 * it into the save area.
+	 */
+	save_vx_regs((__vector128 *)&vcpu->run->s.regs.vrs);
+
+	return kvm_s390_store_adtl_status_unloaded(vcpu, addr);
+}
+
 static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
 {
 	kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu);