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Message-ID: <20241025141453.1210600-3-david@redhat.com>
Date: Fri, 25 Oct 2024 16:14:47 +0200
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org,
linux-s390@...r.kernel.org,
virtualization@...ts.linux.dev,
linux-doc@...r.kernel.org,
kvm@...r.kernel.org,
David Hildenbrand <david@...hat.com>,
Heiko Carstens <hca@...ux.ibm.com>,
Vasily Gorbik <gor@...ux.ibm.com>,
Alexander Gordeev <agordeev@...ux.ibm.com>,
Christian Borntraeger <borntraeger@...ux.ibm.com>,
Sven Schnelle <svens@...ux.ibm.com>,
Thomas Huth <thuth@...hat.com>,
Cornelia Huck <cohuck@...hat.com>,
Janosch Frank <frankja@...ux.ibm.com>,
Claudio Imbrenda <imbrenda@...ux.ibm.com>,
"Michael S. Tsirkin" <mst@...hat.com>,
Jason Wang <jasowang@...hat.com>,
Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
Eugenio PĂ©rez <eperezma@...hat.com>,
Eric Farman <farman@...ux.ibm.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Jonathan Corbet <corbet@....net>
Subject: [PATCH v3 2/7] Documentation: s390-diag.rst: document diag500(STORAGE LIMIT) subfunction
Let's document our new diag500 subfunction that can be implemented by
userspace.
Signed-off-by: David Hildenbrand <david@...hat.com>
---
Documentation/virt/kvm/s390/s390-diag.rst | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/Documentation/virt/kvm/s390/s390-diag.rst b/Documentation/virt/kvm/s390/s390-diag.rst
index 48a326d41cc0..3e4f9e3bef81 100644
--- a/Documentation/virt/kvm/s390/s390-diag.rst
+++ b/Documentation/virt/kvm/s390/s390-diag.rst
@@ -80,6 +80,23 @@ Subcode 3 - virtio-ccw notification
See also the virtio standard for a discussion of this hypercall.
+Subcode 4 - storage-limit
+ Handled by userspace.
+
+ After completion of the DIAGNOSE call, general register 2 will
+ contain the storage limit: the maximum physical address that might be
+ used for storage throughout the lifetime of the VM.
+
+ The storage limit does not indicate currently usable storage, it may
+ include holes, standby storage and areas reserved for other means, such
+ as memory hotplug or virtio-mem devices. Other interfaces for detecting
+ actually usable storage, such as SCLP, must be used in conjunction with
+ this subfunction.
+
+ Note that the storage limit can be larger, but never smaller than the
+ maximum storage address indicated by SCLP via the "maximum storage
+ increment" and the "increment size".
+
DIAGNOSE function code 'X'501 - KVM breakpoint
----------------------------------------------
--
2.46.1
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