From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: virtio-comment-return-772-cohuck=redhat.com@lists.oasis-open.org Sender: List-Post: List-Help: List-Unsubscribe: List-Subscribe: From: "Dr. David Alan Gilbert (git)" Date: Thu, 27 Jun 2019 20:28:29 +0100 Message-Id: <20190627192830.5285-5-dgilbert@redhat.com> In-Reply-To: <20190627192830.5285-1-dgilbert@redhat.com> References: <20190627192830.5285-1-dgilbert@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: [virtio-comment] [PATCH v5 4/5] shared memory: Define PCI capability 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 the PCI capability used for enumerating shared memory regions. Signed-off-by: Dr. David Alan Gilbert --- content.tex | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/content.tex b/content.tex index 63e9179..fcf0d81 100644 --- a/content.tex +++ b/content.tex @@ -689,6 +689,8 @@ \subsection{Virtio Structure PCI Capabilities}\label{sec:Virtio Transport Option #define VIRTIO_PCI_CAP_DEVICE_CFG 4 /* PCI configuration access */ #define VIRTIO_PCI_CAP_PCI_CFG 5 +/* Shared memory region */ +#define VIRTIO_PCI_CAP_SHARED_MEMORY_CFG 8 \end{lstlisting} Any other value is reserved for future use. @@ -1075,6 +1077,24 @@ \subsubsection{Device-specific configuration}\label{sec:Virtio Transport Options The \field{offset} for the device-specific configuration MUST be 4-byte aligned. +\subsubsection{Shared memory capability}\label{sec:Virtio Transport Options / Virtio Over PCI Bus / PCI Device Layout / Shared memory capability} + +Shared memory regions \ref{sec:Basic Facilities of a Virtio +Device / Shared Memory Regions} are enumerated on the PCI transport +as a sequence of VIRTIO_PCI_CAP_SHARED_MEMORY_CFG capabilities, one per region. + +The capability is defined by a struct virtio_pci_cap64 and +utilises the \field{cap.id} to allow multiple shared memory +regions per device. + +\devicenormative{\paragraph}{Device-specific configuration}{Virtio Transport Options / Virtio Over PCI Bus / PCI Device Layout / Shared memory capability} + +The region defined by the combination of the \field {cap.offset}, +\field {cap.offset_hi}, and \field {cap.length}, \field +{cap.length_hi} fields MUST be contained within the declared bar. + +The \field{cap.id} MUST be unique for any one device instance. + \subsubsection{PCI configuration access capability}\label{sec:Virtio Transport Options / Virtio Over PCI Bus / PCI Device Layout / PCI configuration access capability} The VIRTIO_PCI_CAP_PCI_CFG capability -- 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/