Update Xen version to 4.2.0-rc4
Added tag 4.2.0-rc4 for changeset 68640a3c99ce
Added signature for changeset 68640a3c99ce
Added tag 4.2.0-branched for changeset 528f0708b6db
Default to debug builds.
Update Xen version to 4.3-unstable
amd iommu: dump flags of IO page faults

Signed-off-by: Wei Wang <wei.wang2@amd.com>
Committed-by: Jan Beulich <jbeulich@suse.com>
xen: clamp bitmaps to correct number of bits

Valgrind running xl create reports:
 ==24777== Invalid read of size 4
 ==24777==    at 0x4072805: libxl__get_numa_candidate (libxl_numa.c:203)
 ==24777==    by 0x40680B6: libxl__build_pre (libxl_dom.c:166)
 ==24777==    by 0x405B82E: libxl__domain_build (libxl_create.c:323)
 ==24777==    by 0x405BB9C: domcreate_bootloader_done (libxl_create.c:747)
 ==24777==    by 0x407AD27: bootloader_local_detached_cb (libxl_bootloader.c:281)
 ==24777==    by 0x40508D8: local_device_detach_cb (libxl.c:2470)
 ==24777==    by 0x4052B10: libxl__device_disk_local_initiate_detach (libxl.c:2445)
 ==24777==    by 0x407AE9F: bootloader_callback (libxl_bootloader.c:265)
 ==24777==    by 0x407C69A: libxl__bootloader_run (libxl_bootloader.c:392)
 ==24777==    by 0x405CB24: do_domain_create (libxl_create.c:687)
 ==24777==    by 0x405CC5E: libxl_domain_create_new (libxl_create.c:1177)
 ==24777==    by 0x805BDE2: create_domain (xl_cmdimpl.c:1812)
 ==24777==  Address 0x42dbdd8 is 8 bytes after a block of size 48 alloc'd
 ==24777==    at 0x4023340: calloc (vg_replace_malloc.c:593)
 ==24777==    by 0x406D479: libxl__zalloc (libxl_internal.c:88)
 ==24777==    by 0x404EF38: libxl_get_cpu_topology (libxl.c:3707)
 ==24777==    by 0x4072232: libxl__get_numa_candidate (libxl_numa.c:314)
 ==24777==    by 0x40680B6: libxl__build_pre (libxl_dom.c:166)
 ==24777==    by 0x405B82E: libxl__domain_build (libxl_create.c:323)
 ==24777==    by 0x405BB9C: domcreate_bootloader_done (libxl_create.c:747)
 ==24777==    by 0x407AD27: bootloader_local_detached_cb (libxl_bootloader.c:281)
 ==24777==    by 0x40508D8: local_device_detach_cb (libxl.c:2470)
 ==24777==    by 0x4052B10: libxl__device_disk_local_initiate_detach (libxl.c:2445)
 ==24777==    by 0x407AE9F: bootloader_callback (libxl_bootloader.c:265)
 ==24777==    by 0x407C69A: libxl__bootloader_run (libxl_bootloader.c:392)

This is because with nr_cpus=4 the bitmask returned from Xen
contains 0xff rather than 0x0f bit our bitmap walking routines (e.g.
libxl_for_each_set_bit) round up to the next byte (so it iterates
e.g. 8 times not 4). This then causes us to access of the end of
whatever array we are walking through each set bit for.

The principal of least surprise suggests that these bits ought not to
be set and this is not a hot path so fix this at the hypervisor layer
by clamping the bits in the returned bitmap to the correct limit.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Keir Fraser <keir@xen.org>
Committed-by: Jan Beulich <jbeulich@suse.com>
docs: remove WIP notice from command line docs

I'm sure they aren't perfect but various people have done a pass over
them recently and they are much improved. I don't think we need to
continue to describe them so pessimistically.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Ian Jackson <Ian.Jackson@eu.citrix.com>
Committed-by: Ian Campbell <ian.campbell@citrix.com>
x86/32-on-64: adjust Dom0 initial page table layout

Drop the unnecessary reservation of the L4 page for 32on64 Dom0, and
allocate its L3 first (to match behavior when running identical bit-
width hypervisor and Dom0 kernel).

Reported-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>
x86/MSI: fix 2nd S3 resume with interrupt remapping enabled

The first resume from S3 was corrupting internal data structures (in
that pci_restore_msi_state() updated the globally stored MSI message
from traditional to interrupt remapped format, which would then be
translated a second time during the second resume, breaking interrupt
delivery).

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>
adjust a few RCU domain locking calls

x86's do_physdev_op() had a case where the locking was entirely
superfluous. Its physdev_map_pirq() further had a case where the lock
was being obtained too early, needlessly complicating early exit paths.

Grant table code had two open coded instances of
rcu_lock_target_domain_by_id(), and a third code section could be
consolidated by using the newly introduced helper function.

The memory hypercall code had two more instances of open coding
rcu_lock_target_domain_by_id(), but note that here this is not just
cleanup, but also fixes an error return path in memory_exchange() to
actually return an error.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>
VT-d: split .ack and .disable DMA-MSI actors

Calling irq_complete_move() from .disable is wrong, breaking S3 resume.

Comparing with all other .ack actors, it was also missing a call to
move_{native,masked}_irq(). As the actor is masking its interrupt
anyway (albeit it's not immediately obvious why), the latter is the
better choice.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>
Acked-by Xiantao Zhang <xiantao.zhang@intel.com>
unmodified_drivers: handle IRQF_SAMPLE_RANDOM

The flag IRQF_SAMPLE_RANDOM was removed in 3.6-rc1. Add it only if it is
defined. An additional call to add_interrupt_randomness is appearently
not needed because its now called unconditionally in
handle_irq_event_percpu().

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Committed-by: Jan Beulich <jbeulich@suse.com>
libxl: fix error message in device_backend_callback

device_backend_callback error path always says "unable to disconnect",
but this can also happen during the connection of a device. Fix the
error message using the information in aodev->action.

Signed-off-by: Roger Pau Monne <roger.pau@citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Committed-by: Ian Campbell <ian.campbell@citrix.com>
xl.cfg: gfx_passthru documentation improvements

gfx_passthru: Document gfx_passthru makes the GPU become primary in the guest
and other generic info about gfx_passthru.

Signed-off-by: Pasi K?rkk?inen <pasik@iki.fi>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Committed-by: Ian Campbell <ian.campbell@citrix.com>
docs: correct formatting errors in xmdomain.cfg

This patch corrects the following errors produced by pod2man:

Hey! The above document had some coding errors, which are explained
below:

Around line 301:
    You can't have =items (as at line 305) unless the first thing after
    the =over is an =item

Around line 311:
    '=item' outside of any '=over'

Signed-off-by: Matt Wilson <msw@amazon.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Committed-by: Ian Campbell <ian.campbell@citrix.com>
docs: document "ucode=" hypervisor command line option

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Committed-by: Ian Campbell <ian.campbell@citrix.com>