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linux/include/xen
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Vitaly Kuznetsov 8f03e4d1c4 x86/xen: Support kexec/kdump in HVM guests by doing a soft reset 
commit 0b34a166f2 upstream.

Currently there is a number of issues preventing PVHVM Xen guests from
doing successful kexec/kdump:

  - Bound event channels.
  - Registered vcpu_info.
  - PIRQ/emuirq mappings.
  - shared_info frame after XENMAPSPACE_shared_info operation.
  - Active grant mappings.

Basically, newly booted kernel stumbles upon already set up Xen
interfaces and there is no way to reestablish them. In Xen-4.7 a new
feature called 'soft reset' is coming. A guest performing kexec/kdump
operation is supposed to call SCHEDOP_shutdown hypercall with
SHUTDOWN_soft_reset reason before jumping to new kernel. Hypervisor
(with some help from toolstack) will do full domain cleanup (but
keeping its memory and vCPU contexts intact) returning the guest to
the state it had when it was first booted and thus allowing it to
start over.

Doing SHUTDOWN_soft_reset on Xen hypervisors which don't support it is
probably OK as by default all unknown shutdown reasons cause domain
destroy with a message in toolstack log: 'Unknown shutdown reason code
5. Destroying domain.'  which gives a clue to what the problem is and
eliminates false expectations.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
[ luis: backported to 3.16:
  - use CONFIG_KEXEC instead of CONFIG_KEXEC_CORE, as suggested by
    David Vrabel ]
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
History 2015-10-30 13:59:27 +00:00
..
interface x86/xen: Support kexec/kdump in HVM guests by doing a soft reset 2015-10-30 13:59:27 +00:00
acpi.h xen / ACPI: notify xen when reduced hardware sleep is available 2013-07-31 14:22:35 +02:00
balloon.h xen/balloon: set a mapping for ballooned out pages 2013-08-09 11:23:24 -04:00
events.h xen/events: don't bind non-percpu VIRQs with percpu chip 2015-06-02 12:08:17 +01:00
features.h xen: Core Xen implementation 2007-07-18 08:47:42 -07:00
grant_table.h x86/xen: safely map and unmap grant frames when in atomic context 2014-07-30 14:22:47 +01:00
hvc-console.h treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
hvm.h xen: Convert printks to pr_<level> 2013-06-28 11:19:58 -04:00
page.h xen: allow balloon driver to use more than one memory region 2011-09-29 11:12:10 -04:00
platform_pci.h xen/pvhvm: Remove the xen_platform_pci int. 2014-01-03 14:54:53 -05:00
swiotlb-xen.h Merge remote-tracking branch 'stefano/swiotlb-xen-9.1' into stable/for-linus-3.13 2013-11-08 16:10:48 -05:00
tmem.h xen: tmem: enable Xen tmem shim to be built/loaded as a module 2013-04-30 17:04:01 -07:00
xen-ops.h xen: refactor suspend pre/post hooks 2014-05-12 17:19:56 +01:00
xen.h xen/pvh/x86: Define what an PVH guest is (v3). 2014-01-06 10:43:58 -05:00
xenbus.h xen/xenbus: remove unused xenbus_bind_evtchn() 2014-02-28 15:26:23 -05:00
xenbus_dev.h xenbus: Add support for xenbus backend in stub domain 2012-05-21 09:53:18 -04:00