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linux/include/xen/interface
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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
..
hvm Feature: 2012-10-12 22:20:28 +09:00
io Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-06-12 14:27:40 -07:00
callback.h ia64/xen: Remove Xen support for ia64 2013-12-10 16:11:07 -08:00
elfnote.h xen/pvh: Support ParaVirtualized Hardware extensions (v3). 2014-01-06 10:44:24 -05:00
event_channel.h xen/events: Add the hypervisor interface for the FIFO-based event channels 2014-01-06 10:07:52 -05:00
features.h xen/arm: get privilege status 2012-08-08 17:20:18 +00:00
grant_table.h xen: grant: use xen_pfn_t type for frame_list. 2012-10-19 15:17:55 -04:00
memory.h xen: implement updated XENMEM_add_to_physmap_range ABI 2013-02-19 22:01:55 -05:00
physdev.h xen: add support for MSI message groups 2014-03-18 14:40:09 +00:00
platform.h xen / ACPI: notify xen when reduced hardware sleep is available 2013-07-31 14:22:35 +02:00
sched.h x86/xen: Support kexec/kdump in HVM guests by doing a soft reset 2015-10-30 13:59:27 +00:00
vcpu.h xen: Support 64-bit PV guest receiving NMIs 2013-08-09 10:55:47 -04:00
version.h xen/acpi: Move the xen_running_on_version_or_later function. 2012-11-28 14:39:31 -05:00
xen-mca.h xen/mce: Add mcelog support for Xen platform 2012-07-19 15:51:36 -04:00
xen.h arm: xen: implement multicall hypercall support. 2014-04-24 13:09:46 +01:00