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Diffstat (limited to 'feedback/3.txt')
| -rw-r--r-- | feedback/3.txt | 62 |
1 files changed, 0 insertions, 62 deletions
diff --git a/feedback/3.txt b/feedback/3.txt deleted file mode 100644 index 7ff4a3d..0000000 --- a/feedback/3.txt +++ /dev/null @@ -1,62 +0,0 @@ -Document: virtio-v1.0-csprd01 -Number: 3 -Date: Tue, 21 Jan 2014 15:09:54 +0530 -Link to Mail: https://lists.oasis-open.org/archives/virtio-comment/201401/msg00037.html -Commenter name: Pranavkumar Sawargaonkar <pranavkumar@linaro.org> -Decision: Agreed at meeting 2014-01-28. - -This patch updates virtio spec lyx for adding emergency write to -virtio console. - -Original patch series related to this is -: -http://lkml.org/lkml/2013/5/6/167 - -Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar@linaro.org> -Signed-off-by: Anup Patel <anup.patel@linaro.org> -Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> - -Proposal: - -diff --git a/content.tex b/content.tex -index 17d1bd7..96645df 100644 ---- a/content.tex -+++ b/content.tex -@@ -3225,6 +3225,9 @@ data and outgoing characters are placed in the transmit queue. - \item[VIRTIO_CONSOLE_F_MULTIPORT (1)] Device has support for multiple - ports; configuration fields nr_ports and max_nr_ports are - valid and control virtqueues will be used. -+ -+\item[VIRTIO_CONSOLE_F_EMERG_WRITE (2)] Device has support for emergency write. -+ Configuration field emerg_wr is valid. - \end{description} - - \subsection{Device configuration layout}\label{sec:Device Types / Console Device / Device configuration layout} -@@ -3235,11 +3238,16 @@ data and outgoing characters are placed in the transmit queue. - is set, the maximum number of ports supported by the device can - be fetched. - -+ If VIRTIO_CONSOLE_F_EMERG_WRITE is set then the driver can use emergency write -+ to output a single character without initializing virtio queues, or even -+ acknowledging the feature. -+ - \begin{lstlisting} - struct virtio_console_config { - le16 cols; - le16 rows; - le32 max_nr_ports; -+ le32 emerg_wr; - }; - \end{lstlisting} - -@@ -3250,6 +3258,11 @@ native endian of the guest rather than (necessarily) little-endian. - \subsection{Device Initialization}\label{sec:Device Types / Console Device / Device Initialization} - - \begin{enumerate} -+\item If the VIRTIO_CONSOLE_F_EMERG_WRITE feature is offered, the -+ emerg_wr field of the configuration can be written at any time. -+ Thus it should work for very early boot debugging output as well as -+ catastophic OS failures (eg. virtio ring corruption). -+ - \item If the VIRTIO_CONSOLE_F_SIZE feature is negotiated, the driver - can read the console dimensions from the configuration fields. - |