From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: virtio-comment-return-801-cohuck=redhat.com@lists.oasis-open.org Sender: List-Post: List-Help: List-Unsubscribe: List-Subscribe: From: "Dr. David Alan Gilbert (git)" Date: Fri, 12 Jul 2019 13:20:00 +0100 Message-Id: <20190712122002.10793-4-dgilbert@redhat.com> In-Reply-To: <20190712122002.10793-1-dgilbert@redhat.com> References: <20190712122002.10793-1-dgilbert@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: [virtio-comment] [PATCH v7 3/5] pci: Define virtio_pci_cap64 To: virtio-dev@lists.oasis-open.org, virtio-comment@lists.oasis-open.org, stefanha@redhat.com, cohuck@redhat.com Cc: vgoyal@redhat.com List-ID: From: "Dr. David Alan Gilbert" Define 'virtio_pci_cap64' to allow capabilities to describe memory regions larger than, or with an offset larger than 4GiB. This will be used by the shared memory region capability. Signed-off-by: Dr. David Alan Gilbert Reviewed-by: Cornelia Huck --- content.tex | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/content.tex b/content.tex index fafa532..d481359 100644 --- a/content.tex +++ b/content.tex @@ -746,6 +746,23 @@ \subsection{Virtio Structure PCI Capabilities}\label{sec:Virtio Transport Option \end{note} \end{description} +A variant of this type, struct virtio_pci_cap64, is defined for +those capaibilites that require offsets or lengths larger than +4GiB: + +\begin{lstlisting} +struct virtio_pci_cap64 { + struct virtio_pci_cap cap; + u32 offset_hi; + u32 length_hi; +}; +\end{lstlisting} + +Given that the \field{cap.length} and \field{cap.offset} fields +are only 32 bit, the additional \field{offset_hi} and \field {length_hi} +fields provide the most significant 32 bits of a total 64 bit offset and +length within the bar specified by \field{cap.bar}. + \drivernormative{\subsubsection}{Virtio Structure PCI Capabilities}{Virtio Transport Options / Virtio Over PCI Bus / Virtio Structure PCI Capabilities} The driver MUST ignore any vendor-specific capability structure which has -- 2.21.0 This publicly archived list offers a means to provide input to the OASIS Virtual I/O Device (VIRTIO) TC. In order to verify user consent to the Feedback License terms and to minimize spam in the list archive, subscription is required before posting. Subscribe: virtio-comment-subscribe@lists.oasis-open.org Unsubscribe: virtio-comment-unsubscribe@lists.oasis-open.org List help: virtio-comment-help@lists.oasis-open.org List archive: https://lists.oasis-open.org/archives/virtio-comment/ Feedback License: https://www.oasis-open.org/who/ipr/feedback_license.pdf List Guidelines: https://www.oasis-open.org/policies-guidelines/mailing-lists Committee: https://www.oasis-open.org/committees/virtio/ Join OASIS: https://www.oasis-open.org/join/