docs: Fix broken link to intel 0x80 debug port

Previous link to provide details of `0x80 debug port` is removed, which
could no longer be found on intel site [1]. Use snapshot found in web
archive [

docs: Fix broken link to intel 0x80 debug port

Previous link to provide details of `0x80 debug port` is removed, which
could no longer be found on intel site [1]. Use snapshot found in web
archive [2] to fix this link.

Format `debug-port.md` using `mdformat` with GitHub Flavored Markdown
(GFM).

[1] https://www.intel.com/content/www/us/en/homepage.html
[2] https://web.archive.org

Signed-off-by: Ruoqing He <heruoqing@iscas.ac.cn>

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devices: add debug-console device

This commit adds the debug-console (or debugcon) device to CHV. It is a
very simple device on I/O port 0xe9 supported by QEMU and BOCHS. It is
meant for printing in

devices: add debug-console device

This commit adds the debug-console (or debugcon) device to CHV. It is a
very simple device on I/O port 0xe9 supported by QEMU and BOCHS. It is
meant for printing information as easy as possible, without any
necessary configuration from the guest at all.

It is primarily interesting to OS/kernel and firmware developers as they
can produce output as soon as the guest starts without any configuration
of a serial device or similar. Furthermore, a kernel hacker might use
this device for information of type B whereas information of type A are
printed to the serial device.

This device is not used by default by Linux, Windows, or any other
"real" OS, but only by toy kernels and during firmware development.

In the CLI, it can be configured similar to --console or --serial with
the --debug-console parameter.

Signed-off-by: Philipp Schuster <philipp.schuster@cyberus-technology.de>

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docs: update command line options to use clap

Reverts commit a0922930b19cd9160da09b59a3c2f205db7bc30c
and update to latest changes.

Signed-off-by: Ravi kumar Veeramally <ravikumar.veeramally@intel.

docs: update command line options to use clap

Reverts commit a0922930b19cd9160da09b59a3c2f205db7bc30c
and update to latest changes.

Signed-off-by: Ravi kumar Veeramally <ravikumar.veeramally@intel.com>

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docs: update command line options

Signed-off-by: Wei Liu <liuwe@microsoft.com>

docs: Replace every mention of ClearLinux with Ubuntu

Now that our CI has transitioned from ClearLinux to Ubuntu images
exclusively, let's update the documentation to refer to Ubuntu images
instead

docs: Replace every mention of ClearLinux with Ubuntu

Now that our CI has transitioned from ClearLinux to Ubuntu images
exclusively, let's update the documentation to refer to Ubuntu images
instead of ClearLinux's ones.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

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vmm: Add iommu=on|off option for --disk

Having the virtual IOMMU created with --iommu is one thing, but we also
need a way to decide if a virtio-blk device should be attached to this
virtual IOMMU o

vmm: Add iommu=on|off option for --disk

Having the virtual IOMMU created with --iommu is one thing, but we also
need a way to decide if a virtio-blk device should be attached to this
virtual IOMMU or not. That's why we introduce an extra option "iommu"
with the value "on" or "off". By default, the device is not attached,
which means "iommu=off".

One side effect of this new option is that we had to introduce a new
option for the disk path, simply called "path=".

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

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docs: Add debug I/O port HOWTO

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>