Re: [virtio-dev] [PATCH] feedback: s/virtio header/virtio common configuration/

"Michael S. Tsirkin" <> writes:
> While most places now sat virtio common configuration
> structure, some places still use the term virtio header.
> Since it's not necessarily before the
> common configuration anymore, rename it
> to virtio common configuration structure for consistency.
>
> Cc: Arun Subbarao <>
> Signed-off-by: Michael S. Tsirkin <>

Thanks, I've rolled this into feedback/8.txt.

Cheers,
Rusty.

> ---
>  content.tex | 18 +++++++-----------
>  1 file changed, 7 insertions(+), 11 deletions(-)
>
> diff --git a/content.tex b/content.tex
> index 85452e8..b00ea09 100644
> --- a/content.tex
> +++ b/content.tex
> @@ -820,18 +820,14 @@ any Revision ID value.
>  The device is configured via I/O and/or memory regions (though see
>  VIRTIO_PCI_CAP_PCI_CFG for access via the PCI configuration space).
>  
> -These regions contain the virtio header registers, the notification register, the
> -ISR status register and device specific registers, as specified by Virtio
> +These regions contain the virtio common configuration structure registers, the notification register, the
> +ISR status register and device specific configuration registers, as specified by Virtio
>  Structure PCI Capabilities.
>  
>  There may be different widths of accesses to the I/O region; the
>  “natural” access method for each field must be
>  used (i.e. 32-bit accesses for 32-bit fields, etc).
>  
> -PCI Device Configuration Layout includes the common configuration,
> -ISR, notification and device specific configuration
> -structures.
> -
>  All multi-byte fields are little-endian.
>  
>  \subsubsection{Common configuration structure layout}\label{sec:Virtio Transport Options / Virtio Over PCI Bus / PCI Device Layout / Common configuration structure layout}
> @@ -954,18 +950,18 @@ registers in a legacy configuration structure in BAR0 in the first I/O
>  region of the PCI device, as documented below.
>  
>  There may be different widths of accesses to the I/O region; the
> -“natural” access method for each field in the virtio header must be
> +“natural” access method for each field in the virtio common configuration structure must be
>  used (i.e. 32-bit accesses for 32-bit fields, etc), but 
>  when accessed through the legacy interface the
>  device-specific region can be accessed using any width accesses, and
>  should obtain the same results.
>  
> -Note that this is possible because while the virtio header is PCI
> +Note that this is possible because while the virtio common configuration structure is PCI
>  (i.e. little) endian, when using the legacy interface the device-specific
>  region is encoded in the native endian of the guest (where such distinction is
>  applicable).
>  
> -When used through the legacy interface, the virtio header looks as follows:
> +When used through the legacy interface, the virtio common configuration structure looks as follows:
>  
>  \begin{tabularx}{\textwidth}{ |X||X|X|X|X|X|X|X|X| }
>  \hline
> @@ -993,7 +989,7 @@ Purpose (MSI-X) & Configuration Vector  & Queue Vector \\
>  \end{tabular}
>  
>  Note: When MSI-X capability is enabled, device specific configuration starts at
> -byte offset 24 in virtio header structure. When MSI-X capability is not
> +byte offset 24 in virtio common configuration structure structure. When MSI-X capability is not
>  enabled, device specific configuration starts at byte offset 20 in virtio
>  header.  ie. once you enable MSI-X on the device, the other fields move.
>  If you turn it off again, they move back!
> @@ -1352,7 +1348,7 @@ The driver interrupt handler should:
>  \subsubsection{Notification of Device Configuration Changes}\label{sec:Virtio Transport Options / Virtio Over PCI Bus / PCI-specific Initialization And Device Operation / Notification of Device Configuration Changes}
>  
>  Some virtio PCI devices can change the device configuration
> -state, as reflected in the virtio header in the PCI configuration
> +state, as reflected in the virtio common configuration structure in the PCI configuration
>  space. In this case:
>  
>  \begin{itemize}
> -- 
> MST
>
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