[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v6 0/7] dom0less PV drivers
Hi all, Currently dom0less guests cannot use PV drivers because they don't have access to xenstore. Also, the hypervisor node in device tree is missing so they don't detect that they are running on Xen (thus, they don't try to enable PV interfaces.) This patch series enables dom0less guests (on ARM) to use PV drivers. Instead of initializing xenstore immediately at boot, dom0less guests get access to xenstore later. They delay the initialization until they receive a notification via the xenstore event channel (which is available at boot.) An example workflow is as follows: - all domains start in parallel, dom0less guests are immediately running - when dom0 is up and running, the init-dom0less application is called - dom0less guests receive the notification and initialize xenstore - now xl network-attach/disk-attach works as expected for dom0less domUs The patch series introduces a new dom0less device tree option "xen,enhanced" (in the Xen device tree) to specify whether PV interfaces should be enabled/disabled for the dom0less guest. This patch series is based on Daniel P. Smith's "Adds starting the idle domain privileged". A important change in v5 is the usage of XS_CONNECTION_STATE_RECONNECTING to signal that the xenstore interface is not ready. Cheers, Stefano Luca Miccio (3): xen/arm: configure dom0less domain for enabling xenstore after boot xenstored: send an evtchn notification on introduce_domain tools: add example application to initialize dom0less PV drivers Stefano Stabellini (4): xen/dt: of_property_read_string return -ENODATA when !length xen/arm: implement domU extended regions xen: introduce xen,enhanced dom0less property docs: document dom0less + PV drivers docs/features/dom0less.pandoc | 43 ++++- docs/misc/arm/device-tree/booting.txt | 18 ++ docs/misc/xen-command-line.pandoc | 9 +- tools/helpers/Makefile | 13 ++ tools/helpers/init-dom0less.c | 340 ++++++++++++++++++++++++++++++++++ tools/xenstore/xenstored_domain.c | 4 + xen/arch/arm/domain_build.c | 104 ++++++++++- xen/arch/arm/include/asm/kernel.h | 3 + xen/common/device_tree.c | 2 +- xen/common/event_channel.c | 2 +- xen/include/public/io/xs_wire.h | 2 +- xen/include/xen/device_tree.h | 3 + xen/include/xen/event.h | 3 + 13 files changed, 527 insertions(+), 19 deletions(-) create mode 100644 tools/helpers/init-dom0less.c
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