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Tsirkin" , Jason Wang , Xuan Zhuo , =?UTF-8?q?Eugenio=20P=C3=A9rez?= , Eric Farman , Andrew Morton , Jonathan Corbet Subject: [PATCH v3 1/7] Documentation: s390-diag.rst: make diag500 a generic KVM hypercall Date: Fri, 25 Oct 2024 16:14:46 +0200 Message-ID: <20241025141453.1210600-2-david@redhat.com> In-Reply-To: <20241025141453.1210600-1-david@redhat.com> References: <20241025141453.1210600-1-david@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Content-Type: text/plain; charset="utf-8" Let's make it a generic KVM hypercall, allowing other subfunctions to be more independent of virtio. While at it, document that unsupported/unimplemented subfunctions result in a SPECIFICATION exception. This is a preparation for documenting a new hypercall. Signed-off-by: David Hildenbrand Reviewed-by: Eric Farman Reviewed-by: Heiko Carstens --- Documentation/virt/kvm/s390/s390-diag.rst | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) diff --git a/Documentation/virt/kvm/s390/s390-diag.rst b/Documentation/virt= /kvm/s390/s390-diag.rst index ca85f030eb0b..48a326d41cc0 100644 --- a/Documentation/virt/kvm/s390/s390-diag.rst +++ b/Documentation/virt/kvm/s390/s390-diag.rst @@ -35,20 +35,24 @@ DIAGNOSE function codes not specific to KVM, please ref= er to the documentation for the s390 hypervisors defining them. =20 =20 -DIAGNOSE function code 'X'500' - KVM virtio functions ------------------------------------------------------ +DIAGNOSE function code 'X'500' - KVM functions +---------------------------------------------- =20 -If the function code specifies 0x500, various virtio-related functions -are performed. +If the function code specifies 0x500, various KVM-specific functions +are performed, including virtio functions. =20 -General register 1 contains the virtio subfunction code. Supported -virtio subfunctions depend on KVM's userspace. Generally, userspace -provides either s390-virtio (subcodes 0-2) or virtio-ccw (subcode 3). +General register 1 contains the subfunction code. Supported subfunctions +depend on KVM's userspace. Regarding virtio subfunctions, generally +userspace provides either s390-virtio (subcodes 0-2) or virtio-ccw +(subcode 3). =20 Upon completion of the DIAGNOSE instruction, general register 2 contains the function's return code, which is either a return code or a subcode specific value. =20 +If the specified subfunction is not supported, a SPECIFICATION exception +will be triggered. + Subcode 0 - s390-virtio notification and early console printk Handled by userspace. =20 --=20 2.46.1