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[v8,0/2] Add Xue - console over USB 3 Debug Capability

Message ID cover.9762b1190a6fd8f0232c26cbace1b2c4f8555818.1664458360.git-series.marmarek@invisiblethingslab.com (mailing list archive)
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Series Add Xue - console over USB 3 Debug Capability | expand

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Marek Marczykowski-Górecki Sept. 29, 2022, 1:33 p.m. UTC 
This is integration of https://github.com/connojd/xue into mainline Xen.
This patch series includes several patches that I made in the process, some are
very loosely related.

The driver developed by Connor supports console via USB3 debug capability. The
capability is designed to operate mostly independently of normal XHCI driver,
so this patch series allows dom0 to drive standard USB3 controller part, while
Xen uses DbC for console output.

Changes since RFC:
 - move the driver to xue.c, remove non-Xen parts, remove now unneeded abstraction
 - adjust for Xen code style
 - build for x86 only
 - drop patch hidding the device from dom0
Changes since v1:
 - drop ehci patch - already applied
 - adjust for review comments from Jan (see changelogs in individual patches)
Changes since v2:
 - add runtime option to share (or not) the controller with dom0 or other domains
 - add RX support
 - several smaller changes according to review comments
Changes since v3:
 - put controller sharing behind experimental kconfig option
 - several other changes according to review comments
Changes since v4:
 - drop first 4 patches - already applied to staging
 - split dbgp=xhci into dbc=xhci
Changes since v5:
 - roll dbc=xhci back into dbgp=xhci, but make it work together with dbgp=ehci
Changes since v6:
 - reorder patches - put acked ones early (I've put acked IOMMU ones early too,
   even without VT-d, because they do make it work on AMD, and it's kind
   of required to get the console work with IOMMU enabled)
 - drop barriers patch (at least for now)
 - new patches for suspend support and console=ehci alias
Changes since v7:
 - drop commited already patches
 - drop "onsole: support multiple serial console simultaneously" as there is no interest in including it
 - adjust VT-d patch according to Kevin's request

Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: George Dunlap <george.dunlap@citrix.com>
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Julien Grall <julien@xen.org>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Wei Liu <wl@xen.org>
Cc: "Roger Pau Monné" <roger.pau@citrix.com>
Cc: Paul Durrant <paul@xen.org>
Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Connor Davis <connojdavis@gmail.com>

Marek Marczykowski-Górecki (2):
  IOMMU/VT-d: wire common device reserved memory API
  drivers/char: suspend handling in XHCI console driver

 xen/drivers/char/xhci-dbc.c        |  55 +++++++-
 xen/drivers/passthrough/vtd/dmar.c | 196 +++++++++++++++++-------------
 2 files changed, 163 insertions(+), 88 deletions(-)

base-commit: b726541d94bd0a80b5864d17a2cd2e6d73a3fe0a