Hi folks,
I'm planning to merge pretty much all of the Xen changes from head into
stable/8 soon. (i.e. before the stable/8 code freeze)
If anyone has any objections, speak now. (Make sure to send mail to me
directly, I'll see it more quickly.)
I have attached what will be the commit message, so you can see what is
involed.
Thanks,
Ken
--
Kenneth Merry
k...@freebsd.org
MFC r215818, r216405, r216437, r216448, r216956, r221827, r222975, r223059,
r225343, r225704, r225705, r225706, r225707, r225709, r226029, r220647,
r230183, r230587, r230916, r228526, r230879:
Bring Xen support in stable/8 up to parity with head.
r215818 | cperciva | 2010-11-25 08:05:21 -0700 (Thu, 25 Nov 2010) | 5 lines
Rename HYPERVISOR_multicall (which performs the multicall hypercall) to
_HYPERVISOR_multicall, and create a new HYPERVISOR_multicall function which
invokes _HYPERVISOR_multicall and checks that the individual hypercalls all
succeeded.
r216405 | rwatson | 2010-12-13 05:15:46 -0700 (Mon, 13 Dec 2010) | 7 lines
Add options NO_ADAPTIVE_SX to the XENHVM kernel configuration, matching
its similar disabling of adaptive mutexes and rwlocks. The existing
comment on why this is the case also applies to sx locks.
MFC after: 3 days
Discussed with: attilio
r216437 | gibbs | 2010-12-14 10:23:49 -0700 (Tue, 14 Dec 2010) | 2 lines
Remove spurious printf left over from debugging our XenStore support.
r216448 | gibbs | 2010-12-14 13:57:40 -0700 (Tue, 14 Dec 2010) | 4 lines
Fix a typo in a comment.
Noticed by: Attila Nagy <b...@fsn.hu>
r216956 | rwatson | 2011-01-04 07:49:54 -0700 (Tue, 04 Jan 2011) | 8 lines
Make "options XENHVM" compile for i386, not just amd64 -- a largely
mechanical change. This opens the door for using PV device drivers
under Xen HVM on i386, as well as more general harmonisation of i386
and amd64 Xen support in FreeBSD.
Reviewed by: cperciva
MFC after: 3 weeks
r221827 | mav | 2011-05-12 21:40:16 -0600 (Thu, 12 May 2011) | 2 lines
Fix msleep() usage in Xen balloon driver to not wake up on every HZ tick.
r222975 | gibbs | 2011-06-10 22:59:01 -0600 (Fri, 10 Jun 2011) | 63 lines
Monitor and emit events for XenStore changes to XenBus trees
of the devices we manage. These changes can be due to writes
we make ourselves or due to changes made by the control domain.
The goal of these changes is to insure that all state transitions
can be detected regardless of their source and to allow common
device policies (e.g. "onlined" backend devices) to be centralized
in the XenBus bus code.
sys/xen/xenbus/xenbusvar.h:
sys/xen/xenbus/xenbus.c:
sys/xen/xenbus/xenbus_if.m:
Add a new method for XenBus drivers "localend_changed".
This method is invoked whenever a write is detected to
a device's XenBus tree. The default implementation of
this method is a no-op.
sys/xen/xenbus/xenbus_if.m:
sys/dev/xen/netfront/netfront.c:
sys/dev/xen/blkfront/blkfront.c:
sys/dev/xen/blkback/blkback.c:
Change the signature of the "otherend_changed" method.
This notification cannot fail, so it should return void.
sys/xen/xenbus/xenbusb_back.c:
Add "online" device handling to the XenBus Back Bus
support code. An online backend device remains active
after a front-end detaches as a reconnect is expected
to occur in the near future.
sys/xen/interface/io/xenbus.h:
Add comment block further explaining the meaning and
driver responsibilities associated with the XenBus
Closed state.
sys/xen/xenbus/xenbusb.c:
sys/xen/xenbus/xenbusb.h:
sys/xen/xenbus/xenbusb_back.c:
sys/xen/xenbus/xenbusb_front.c:
sys/xen/xenbus/xenbusb_if.m:
o Register a XenStore watch against the local XenBus tree
for all devices.
o Cache the string length of the path to our local tree.
o Allow the xenbus front and back drivers to hook/filter both
local and otherend watch processing.
o Update the device ivar version of "state" when we detect
a XenStore update of that node.
sys/dev/xen/control/control.c:
sys/xen/xenbus/xenbus.c:
sys/xen/xenbus/xenbusb.c:
sys/xen/xenbus/xenbusb.h:
sys/xen/xenbus/xenbusvar.h:
sys/xen/xenstore/xenstorevar.h:
Allow clients of the XenStore watch mechanism to attach
a single uintptr_t worth of client data to the watch.
This removes the need to carefully place client watch
data within enclosing objects so that a cast or offsetof
calculation can be used to convert from watch to enclosing
object.
Sponsored by: Spectra Logic Corporation
MFC after: 1 week
r223059 | gibbs | 2011-06-13 14:36:29 -0600 (Mon, 13 Jun 2011) | 36 lines
Several enhancements to the Xen block back driver.
sys/dev/xen/blkback/blkback.c:
o Implement front-end request coalescing. This greatly improves the
performance of front-end clients that are unaware of the dynamic
request-size/number of requests negotiation available in the
FreeBSD backend driver. This required a large restructuring
in how this driver records in-flight transactions and how those
transactions are mapped into kernel KVA. For example, the driver
now includes a mini "KVA manager" that allocates ranges of
contiguous KVA to patches of requests that are physically
contiguous in the backing store so that a single bio or UIO
segment can be used to represent the I/O.
o Refuse to open any backend files or devices if the system
has yet to mount root. This avoids a panic.
o Properly handle "onlined" devices. An "onlined" backend
device stays attached to its backing store across front-end
disconnections. This feature is intended to reduce latency
when a front-end does a hand-off to another driver (e.g.
PV aware bootloader to OS kernel) or during a VM reboot.
o Harden the driver against a pathological/buggy front-end
by carefully vetting front-end XenStore data such as the
front-end state.
o Add sysctls that report the negotiated number of
segments per-request and the number of requests that
can be concurrently in flight.
Submitted by: kdm
Reviewed by: gibbs
Sponsored by: Spectra Logic Corporation
MFC after: 1 week
r225343 | rwatson | 2011-09-02 11:36:01 -0600 (Fri, 02 Sep 2011) | 7 lines
Add support for alternative break-to-debugger support on the Xen console.
This should help debug boot-time hangs experienced in 9.0-BETA.
MFC after: 3 weeks
Tested by: sbruno
Approved by: re (kib)
r225704 | gibbs | 2011-09-20 17:44:34 -0600 (Tue, 20 Sep 2011) | 29 lines
Properly handle suspend/resume events in the Xen device framework.
Sponsored by: BQ Internet
sys/xen/xenbus/xenbusb.c:
o In xenbusb_resume(), publish the state transition of the
resuming device into XenbusStateIntiailising so that the
remote peer can see it. Recording the state locally is
not sufficient to trigger a re-connect sequence.
o In xenbusb_resume(), defer new-bus resume processing until
after the remote peer's XenStore address has been updated.
The drivers may need to refer to this information during
resume processing.
sys/xen/xenbus/xenbusb_back.c:
sys/xen/xenbus/xenbusb_front.c:
Register xenbusb_resume() rather than bus_generic_resume()
as the handler for device_resume events.
sys/xen/xenstore/xenstore.c:
o Fix grammer in a comment.
o In xs_suspend(), pass suspend events on to the child
devices (e.g. xenbusb_front/back, that are attached
to the XenStore.
Approved by: re
MFC after: 1 week
r225705 | gibbs | 2011-09-20 18:02:44 -0600 (Tue, 20 Sep 2011) | 35 lines
Add suspend/resume support to the Xen blkfront driver.
Sponsored by: BQ Internet
sys/dev/xen/blkfront/block.h:
sys/dev/xen/blkfront/blkfront.c:
Remove now unused blkif_vdev_t from the blkfront soft.
sys/dev/xen/blkfront/blkfront.c:
o In blkfront_suspend(), indicate the desire to suspend
by changing the softc connected state to SUSPENDED, and
then wait for any I/O pending on the remote peer to
drain. Cancel suspend processing if I/O does not
drain within 30 seconds.
o Enable and update blkfront_resume(). Since I/O is
drained prior to the suspension of the VM, the complicated
recovery process performed by other Xen blkfront
implementations is avoided. We simply tear down the
connection to our old peer, and then re-connect.
o In blkif_initialize(), fix a resource leak and botched
return if we cannot allocate shadow memory for our
requests.
o In blkfront_backend_changed(), correct our response to
the XenbusStateInitialised state. This state indicates
that our backend peer has published sufficient data for
blkfront to publish ring information and other XenStore
data, not that a connection can occur. Blkfront now
will only perform connection processing in response to
the XenbusStateConnected state. This corrects an issue
where blkfront connected before the backend was ready
during resume processing.
Approved by: re
MFC after: 1 week
r225706 | gibbs | 2011-09-20 18:06:02 -0600 (Tue, 20 Sep 2011) | 11 lines
[ Forced commit. Actual changes accidentally included in r225704 ]
sys/dev/xen/control/control.c:
Fix locking violations in Xen HVM suspend processing
and have it perform similar actions to those performed
during an ACPI triggered suspend.
Sponsored by: BQ Internet
Approved by: re
MFC after: 1 week
r225707 | gibbs | 2011-09-20 18:08:25 -0600 (Tue, 20 Sep 2011) | 21 lines
Correct suspend/resume support in the Netfront driver.
Sponsored by: BQ Internet
sys/dev/xen/netfront/netfront.c:
o Implement netfront_suspend(), a specialized suspend
handler for the netfront driver. This routine simply
disables the carrier so the driver is idle during
system suspend processing.
o Fix a leak when re-initializing LRO during a link reset.
o In netif_release_tx_bufs(), when cleaning up the grant
references for our TX ring, use gnttab_end_foreign_access_ref
instead of attempting to grant the page again.
o In netif_release_tx_bufs(), we do not track mbufs associated
with mbuf chains, but instead just free each mbuf directly.
Use m_free(), not m_freem(), to avoid double frees of mbufs.
o Refactor some code to enhance clarity.
Approved by: re
MFC after: 1 week
r225709 | gibbs | 2011-09-20 18:15:29 -0600 (Tue, 20 Sep 2011) | 19 lines
Update netfront so that it queries and honors published
back-end features.
sys/dev/xen/netfront/netfront.c:
o Add xn_query_features() which reads the XenStore and
records the TSO, LRO, and chained ring-request support
of the backend.
o Rename xn_configure_lro() to xn_configure_features() and
use this routine to manage the setup of TSO, LRO, and
checksum offload.
o In create_netdev(), initialize if_capabilities and
if_hwassist to the capabilities found on all backends.
Delegate configuration of if_capenable and the TSO flag
if if_hwassist to xn_configure_features().
Reported by: Hugo Silva (fix inspired by patch provided)
Approved by: re
MFC after: 1 week
r226029 | jkim | 2011-10-04 17:53:47 -0600 (Tue, 04 Oct 2011) | 2 lines
Add strnlen() to libkern.
r220647 | jkim | 2011-04-14 16:17:39 -0600 (Thu, 14 Apr 2011) | 4 lines
Add event handlers for (ACPI) suspend/resume events. Suspend event handlers
are invoked right before device drivers go into sleep state and resume event
handlers are invoked right after all device drivers are waken up.
r230183 | cperciva | 2012-01-15 19:38:45 -0700 (Sun, 15 Jan 2012) | 3 lines
Make XENHVM work on i386. The __ffs() function counts bits starting from
zero, unlike ffs(3), which starts counting from 1.
r230587 | ken | 2012-01-26 09:35:09 -0700 (Thu, 26 Jan 2012) | 38 lines
Xen netback driver rewrite.
share/man/man4/Makefile,
share/man/man4/xnb.4,
sys/dev/xen/netback/netback.c,
sys/dev/xen/netback/netback_unit_tests.c:
Rewrote the netback driver for xen to attach properly via newbus
and work properly in both HVM and PVM mode (only HVM is tested).
Works with the in-tree FreeBSD netfront driver or the Windows
netfront driver from SuSE. Has not been extensively tested with
a Linux netfront driver. Does not implement LRO, TSO, or
polling. Includes unit tests that may be run through sysctl
after compiling with XNB_DEBUG defined.
sys/dev/xen/blkback/blkback.c,
sys/xen/interface/io/netif.h:
Comment elaboration.
sys/kern/uipc_mbuf.c:
Fix page fault in kernel mode when calling m_print() on a
null mbuf. Since m_print() is only used for debugging, there
are no performance concerns for extra error checking code.
sys/kern/subr_scanf.c:
Add the "hh" and "ll" width specifiers from C99 to scanf().
A few callers were already using "ll" even though scanf()
was handling it as "l".
Submitted by: Alan Somers <al...@spectralogic.com>
Submitted by: John Suykerbuyk <jo...@spectralogic.com>
Sponsored by: Spectra Logic
MFC after: 1 week
Reviewed by: ken
r230916 | ken | 2012-02-02 10:54:35 -0700 (Thu, 02 Feb 2012) | 13 lines
Fix the netback driver build for i386.
netback.c: Add missing VM includes.
xen/xenvar.h,
xen/xenpmap.h: Move some XENHVM macros from <machine/xen/xenpmap.h> to
<machine/xen/xenvar.h> on i386 to match the amd64 headers.
conf/files: Add netback to the build.
Submitted by: jhb
MFC after: 3 days
r228526 | kevlo | 2011-12-14 23:29:13 -0700 (Wed, 14 Dec 2011) | 2 lines
s/timout/timeout
r230879 | ken | 2012-02-01 13:19:33 -0700 (Wed, 01 Feb 2012) | 4 lines
Add the GSO prefix descriptor define.
MFC after: 3 days
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