[PATCH v1 2/2] transport-pci: Add legacy register access conformance section

[Parav Pandit <parav@nvidia.com>]

Add device and driver conformanace section for legacy registers access
commands interface.

Fixes: https://github.com/oasis-tcs/virtio-spec/issues/167
Signed-off-by: Parav Pandit <parav@nvidia.com>
---
 conformance.tex           |  2 ++
 transport-pci-vf-regs.tex | 31 +++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/conformance.tex b/conformance.tex
index 01ccd69..dbd8cd6 100644
--- a/conformance.tex
+++ b/conformance.tex
@@ -109,6 +109,7 @@ \section{Conformance Targets}\label{sec:Conformance / Conformance Targets}
 \item \ref{drivernormative:Virtio Transport Options / Virtio Over PCI Bus / PCI Device Layout / PCI configuration access capability}
 \item \ref{drivernormative:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Device Initialization / MSI-X Vector Configuration}
 \item \ref{drivernormative:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Notification of Device Configuration Changes}
+\item \ref{drivernormative:Virtio Transport Options / Virtio Over PCI Bus / SR-IOV Legacy Registers Access}
 \end{itemize}
 
 \conformance{\subsection}{MMIO Driver Conformance}\label{sec:Conformance / Driver Conformance / MMIO Driver Conformance}
@@ -194,6 +195,7 @@ \section{Conformance Targets}\label{sec:Conformance / Conformance Targets}
 \item \ref{devicenormative:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Device Initialization / MSI-X Vector Configuration}
 \item \ref{devicenormative:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Used Buffer Notifications}
 \item \ref{devicenormative:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Notification of Device Configuration Changes}
+\item \ref{devicenormative:Virtio Transport Options / Virtio Over PCI Bus / SR-IOV Legacy Registers Access}
 \end{itemize}
 
 \conformance{\subsection}{MMIO Device Conformance}\label{sec:Conformance / Device Conformance / MMIO Device Conformance}
diff --git a/transport-pci-vf-regs.tex b/transport-pci-vf-regs.tex
index 16ced32..7d0574b 100644
--- a/transport-pci-vf-regs.tex
+++ b/transport-pci-vf-regs.tex
@@ -82,3 +82,34 @@ \subsubsection{Legacy Queue Notify Offset Query}\label{sec:Virtio Transport Opti
 	le64 offset; /* Byte offset within the BAR */
 };
 \end{lstlisting}
+
+\devicenormative{\paragraph}{SR-IOV VFs Legacy Registers Access}{Virtio Transport Options / Virtio Over PCI Bus / SR-IOV Legacy Registers Access}
+
+If the PCI PF device supports legacy registers access, it SHOULD set
+corresponding bits for commands VIRTIO_ADMIN_CMD_LREG_WRITE,
+VIRTIO_ADMIN_CMD_LREG_READ and VIRTIO_ADMIN_CMD_LQ_NOTIFY_QUERY in 
+command result of VIRTIO_ADMIN_CMD_LIST_QUERY in
+\field{device_admin_cmd_opcodes}.
+
+The device MUST support legacy configuration registers to its defined width.
+
+The device MAY fail legacy configuration registers access when either the 
+access is for an incorrct register width or if the register offset is incorrect.
+
+The device MUST allow access of one or multiple bytes of the registers when
+such register is defined as byte array, for example \field{mac} of \field{struct
+virtio_net_config} of the Network Device.
+
+\drivernormative{\paragraph}{SR-IOV VFs Legacy Registers Access}{Virtio Transport Options / Virtio Over PCI Bus / SR-IOV Legacy Registers Access}
+
+The driver MUST access legacy configuration registers to its defined width.
+
+The driver MUST access device specific registers to its defined width
+
+The driver MAY access one or multiple bytes of the device specific registers
+which are defined as byte array, for example \field{mac} of \field{struct
+virtio_net_config} of the Network Device.
+
+The driver SHOULD access all the bytes of a device specific registers in a
+single access when accessing a byte array, for example \field{mac} of
+\field{struct virtio_net_config} of the Network Device.
-- 
2.26.2