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Tsirkin" , Jason Wang , Xuan Zhuo , =?utf-8?q?Eugenio_P=C3=A9rez?= , Eric Farman , Andrew Morton , Jonathan Corbet Subject: [PATCH v3 2/7] Documentation: s390-diag.rst: document diag500(STORAGE LIMIT) subfunction Date: Fri, 25 Oct 2024 16:14:47 +0200 Message-ID: <20241025141453.1210600-3-david@redhat.com> In-Reply-To: <20241025141453.1210600-1-david@redhat.com> References: <20241025141453.1210600-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: E499540011 X-Stat-Signature: byehogmupt6i36tp6y6fwpzsqakxz18m X-Rspam-User: X-HE-Tag: 1729865713-603476 X-HE-Meta: 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 uVUiJvsk w1YKP2mpWZJQtkumD10WhEMfPFEqELpgVjPGltUBh1cVeYDtbJsZer9FEFzdgs62jukULG3XtMwIyWhKmhOzDHx+6X//rgFZ3i+QVkNFP3hkOnXUv1D6MM/hjAjApI+ymIfSx7++x+MtLMGhFaB+jw+Qhq/mVDpBlE+hhgnnJO7X4tALiXNIolf2nJzl2VJf/+h0T7ihvNvxxBv2zc30fEvCk0vLSZEyBPNDHJPHpbwswmWOjSsWgGIFrhnZ+7W3SnN9oWqoRgjoFbisZEt5OmkyApkAw6HWR5cZHm/wy3umPwDUwtu6pwSQwGEtJfRCkee/Q/RMihKp2dxo= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Let's document our new diag500 subfunction that can be implemented by userspace. Signed-off-by: David Hildenbrand --- 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 ----------------------------------------------