qemu/osdep.h checks whether MAP_ANONYMOUS is defined, but this check
is bogus without a previous inclusion of sys/mman.h. Include it in
sysemu/os-posix.h and remove it from everywhere else.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Make sure that guests can use the PowerISA 2.07 CPU sPAPR
compatibility mode when they request it and the target CPU
supports it.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
When using an olderr PowerISA level, all the upper compatibility
bits have to be enabled, too. For example when we want to run
something in PowerISA 2.05 compatibility mode on POWER8, the bit
for 2.06 has to be set beside the bit for 2.05.
Additionally, to make sure that we do not set bits that are not
supported by the host, we apply a mask with the known-to-be-good
bits here, too.
Signed-off-by: Thomas Huth <thuth@redhat.com>
[dwg: Added some #ifs to fix compile on 32-bit targets]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
When running with KVM, we might be interested in some details
of the host CPU class, too, so provide a function to get the
corresponding CPU class.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The current pcr_mask values are ambiguous: Should these be the mask
that defines valid bits in the PCR register? Or should these rather
indicate which compatibility levels are possible? Anyway, POWER6 and
POWER7 should certainly not use the same values here. So let's
introduce an additional variable "pcr_supported" here which is
used to indicate the valid compatibility levels, and use pcr_mask
to signal the valid bits in the PCR register.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This includes some infrastructure for ipmi smbios tables.
Beginning of acpi hotplug rework by Igor for supporting >255 CPUs.
Misc cleanups and fixes.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging
pc, pci, virtio: new features, cleanups, fixes
This includes some infrastructure for ipmi smbios tables.
Beginning of acpi hotplug rework by Igor for supporting >255 CPUs.
Misc cleanups and fixes.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
# gpg: Signature made Tue 07 Jun 2016 13:55:22 BST
# gpg: using RSA key 0x281F0DB8D28D5469
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>"
# gpg: aka "Michael S. Tsirkin <mst@redhat.com>"
* remotes/mst/tags/for_upstream: (25 commits)
virtio: move bi-endian target support to a single location
pc-dimm: introduce realize callback
pc-dimm: get memory region from ->get_memory_region()
acpi: make bios_linker_loader_add_checksum() API offset based
acpi: make bios_linker_loader_add_pointer() API offset based
tpm: apci: cleanup TCPA table initialization
acpi: cleanup bios_linker_loader_cleanup()
acpi: simplify bios_linker API by removing redundant 'table' argument
acpi: convert linker from GArray to BIOSLinker structure
pc: use AcpiDeviceIfClass.send_event to issue GPE events
acpi: extend ACPI interface to provide send_event hook
pc: Postpone SMBIOS table installation to post machine init
ipmi: rework the fwinfo to be fetched from the interface
tests: acpi: update tables with consolidated legacy cpu-hotplug AML
pc: acpi: cpuhp-legacy: switch ProcessorID to possible_cpus idx
pc: acpi: simplify build_legacy_cpu_hotplug_aml() signature
pc: acpi: consolidate legacy CPU hotplug in one file
pc: acpi: mark current CPU hotplug functions as legacy
pc: acpi: cpu-hotplug: make AML CPU_foo defines local to cpu_hotplug_acpi_table.c
pc: acpi: consolidate \GPE._E02 with the rest of CPU hotplug AML
...
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Paolo's recent cpu.h cleanups broke legacy virtio for ppc64 LE guests (and
arm BE guests as well, even if I have not verified that). Especially, commit
"33c11879fd42 qemu-common: push cpu.h inclusion out of qemu-common.h" has
the side-effect of silently hiding the TARGET_IS_BIENDIAN macro from the
virtio memory accessors, and thus fully disabling support of endian changing
targets.
To be sure this cannot happen again, let's gather all the bi-endian bits
where they belong in include/hw/virtio/virtio-access.h.
The changes in hw/virtio/vhost.c are safe because vhost_needs_vring_endian()
is not called on a hot path and non bi-endian targets will return false
anyway.
While here, also rename TARGET_IS_BIENDIAN to be more precise: it is only for
legacy virtio and bi-endian guests.
Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
The architecture specifies that mtspr/mfspr on an unknown SPR number
should act as a nop in privileged mode.
I haven't removed the warning however as it can be useful for
diagnosing.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Used to lookup SLB entries by address, for some reason it was missing.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Since at least the 2.05 architecture, the slbia instruction takes an
IH field in the opcode to provide some control on the effect of the
slbia on the ERATs (level-1 TLB).
We can safely ignore it as we always flush the whole qemu TLB but
we should allow the bits in the decode.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
We had code to handle the L bit in the opcode but we didn't
allow it in the decode mask.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The PPC_64BX instruction flag is used for a couple of newer
instructions currently on POWER8 but our implementation for
them works for POWER7 too (and already does the proper checking
of what is permitted) with one exception: stq needs to check
the ISA version.
This fixes the latter and add the instructions to POWER7
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
We only had them on POWER8, add them to POWER7 as well
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This ports the existing 64-bit mechanism to 32-bit, thus series
of 64 tlbie's followed by a sync like some versions of Darwin
(ab)use will result in a single flush.
We apply a pending flush on any sync instruction though, as Darwin
doesn't use tlbsync on non-SMP systems.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The processor only uses some bits of the address and invalidates an
entire congruence class. Some OSes such as Darwin and HelenOS take
advantage of this and occasionally invalidate the entire TLB by just
doing a series of 64 consecutive tlbie for example.
Our code tries to be too smart here only invalidating a segment
congruence class (ie, allowing more address bits to be relevant
in the invalidation), this fails miserably on those OSes.
Instead don't bother, do like ppc64 and blow the whole tlb when tlbie
is executed.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
We used to always flush the TLB when changing relocation mode in
MSR:IR and MSR:DR (ie. MMU on/off for Instructions and Data).
We don't anymore since we have split mmu_idx for instruction and data.
However, since we hard code the mmu_idx in the translated code, we
now need to also make sure MSR:IR and MSR:DR are part of the hflags
used to tag translated code, so that we use different translated
code for different MMU settings.
Darwin gets hurt by this problem.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This fixes compilation of mmu_helper.c when all of the debug #defines at
the start of the file are enabled.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
commit 74693da988 ('ppc: tlbie, tlbia and tlbisync are HV only')
introduced some extra checks on the instruction privilege. slbia was
changed wrongly and hrfid, tlbia were forgotten.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This helper is only used by the various instructions that can alter
MSR and not interrupts. Add a comment to that effect to the interrupt
code as well in case somebody wants to change this
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
We use an env. flag which is set to the initial value of MSR_HVB in
the msr_mask. We also adjust the POWER8 mask to set SHV.
Also use this to adjust ctx.hv so that it is *set* when the processor
doesn't have an HV mode (970 with Apple mode for example), thus enabling
hypervisor instructions/SPRs.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
[clg: ctx.hv used to be defined only for the hypervisor kernel
(HV=1|PR=0). It is now defined also when PR=1 and conditions are
fixed accordingly.
stripped unwanted tabs.]
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
With specification at hand from the reference manual from Freescale
http://cache.nxp.com/files/32bit/doc/ref_manual/SPEPEM.pdf , I have found a fix
to efscmp* instructions handling in QEMU.
efscmp* instructions in QEMU set crD (Condition Register nibble) values as
(0b0100 << 2) = 0b10000 (consider the HELPER_SINGLE_SPE_CMP macro which left
shifts the value returned by efscmp* handler by 2 bits). A value of 0b10000 is
not correct according the to the reference manual.
The reference manual expects efscmp* instructions to return a value of 0bx1xx.
Please find attached a patch which disables left shifting in
HELPER_SINGLE_SPE_CMP macro. This macro is used by efscmp* and efstst*
instructions only. efstst* instruction handlers, in turn, call efscmp* handlers
too.
*Explanation:*
Traditionally, each crD (condition register nibble) consist of 4 bits, which is
set by comparisons as follows:
crD = W X Y Z
where
W = Less than
X = Greater than
Y = Equal to
However, efscmp* instructions being a special case return a binary result.
(efscmpeq will set the crD = 0bx1xx iff when op1 == op2 and 0bx0xx otherwise;
i.e. there is no notion of different crD values based on Less than, Greater
than and Equal to).
This effectively means that crD will store a "Greater than" comparison result
iff efscmp* instruction comparison is TRUE. Compiler exploits this feature by
checking for "Branch if Less than or Equal to" (ble instruction) OR "Branch if
Greater than" (bgt instruction) for Branch if FALSE OR Branch if TRUE
respectively after an efscmp* instruction. This can be seen in a assembly code
snippet below:
27 if (__real__ x != 3.0f || __imag__ x != 4.0f)
10000498: lwz r10,8(r31)
1000049c: lis r9,16448
100004a0: efscmpeq cr7,r10,r9
100004a4: ble- cr7,0x100004b8 <bar+60> //jump to abort() call
100004a8: lwz r10,12(r31)
100004ac: lis r9,16512
100004b0: efscmpeq cr7,r10,r9
100004b4: bgt- cr7,0x100004bc <bar+64> //skip abort() call
28 abort ();
100004b8: bl 0x10000808 <abort>
Signed-off-by: Talha Imran <talha_imran@mentor.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The arm target was handled by 06486077, but other targets
were ignored. This handles all the rest which actually support
disassembly (that is, skipping moxie and tilegx).
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This will enable decoding of hrfid
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Otherwise tight loops at smt_low for example, which OPAL does,
eat so much CPU that we can't boot a kernel anymore. With that,
I can boot 8 CPUs just fine with powernv.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Otherwise it will trip on the forms used in recent architecture.
Ideally, we should have different handlers for different architecture
levels but our current implementation of TLB flushing is dumb enough
that this will do for now.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Not that anything remotely recent supports tlbia but ...
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
On ppc64 especially, we flush the tlb on any slbie or tlbie instruction.
However, those instructions often come in bursts of 3 or more (context
switch will favor a series of slbie's for example to an slbia if the
SLB has less than a certain number of entries in it, and tlbie's can
happen in a series, with PAPR, H_BULK_REMOVE can remove up to 4 entries
at a time.
Doing a tlb_flush() each time is a waste of time. We end up doing a memset
of the whole TLB, reloading it for the next instruction, memset'ing again,
etc...
Those instructions don't have to take effect immediately. For slbie, they
can wait for the next context synchronizing event. For tlbie, the next
tlbsync.
This implements batching by keeping a flag that indicates that we have a
TLB in need of flushing. We check it on interrupts, rfi's, isync's and
tlbsync and flush the TLB if needed.
This reduces the number of tlb_flush() on a boot to a ubuntu installer
first dialog screen from roughly 360K down to 36K.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
[clg: added a 'CPUPPCState *' variable in h_remove() and
h_bulk_remove() ]
Signed-off-by: Cédric Le Goater <clg@kaod.org>
[dwg: removed spurious whitespace change, use 0/1 not true/false
consistently, since tlb_need_flush has int type]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
We rework the way the MMU indices are calculated, providing separate
indices for I and D side based on MSR:IR and MSR:DR respectively,
and thus no longer need to flush the TLB on context changes. This also
adds correct support for HV as a separate address space.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
We don't use the resulting accessors and this gets in the way of
the split I/D TLB work.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
6a81dd17 "spapr_iommu: Rename vfio_accel parameter" renamed vfio_accel
flag everywhere but one spot was missed.
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The KVM API restricts vcpu ids to be < KVM_CAP_MAX_VCPUS. On PowerPC
targets, depending on the number of threads per core in the host and
in the guest, some topologies do generate higher vcpu ids actually.
When this happens, QEMU bails out with the following error:
kvm_init_vcpu failed: Invalid argument
The KVM_CREATE_VCPU ioctl has several EINVAL return paths, so it is
not possible to fully disambiguate.
This patch adds a check in the code that computes vcpu ids, so that
we can detect the error earlier, and print a friendlier message instead
of calling KVM_CREATE_VCPU with an obviously bogus vcpu id.
Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Mirror the cleanups just done to rlwinm, rlwnm and rlwimi.
This adds use of deposit to rldimi.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
A 32-bit rotate insn is more common on hosts than a deposit insn,
and if the host has neither the result is truely horrific.
At the same time, tidy up the temporaries within these functions,
drop the over-use of "likely", drop some checks for identity that
will also be checked by tcg-op.c functions, and special case mask
without rotate within rlwinm.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
ppc_hash64_set_external_hpt() was added in e5c0d3c "target-ppc: Add helpers
for updating a CPU's SDR1 and external HPT". This helper contains a
cpu_synchronize_state() since it may need to push state back to KVM
afterwards.
This turns out to break things when it is used in the reset path, which is
the only current user. It appears that kvm_vcpu_dirty is not being set
early in the reset path, so the cpu_synchronize_state() is clobbering state
set up by the early part of the cpu reset path with stale state from KVM.
This may require some changes to the generic cpu reset path to fix
properly, but as a short term fix we can just remove the
cpu_synchronize_state() from ppc_hash64_set_external_hpt(), and require any
non-reset path callers to do that manually.
Reported-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
exec-all.h contains TCG-specific definitions. It is not needed outside
TCG-specific files such as translate.c, exec.c or *helper.c.
One generic function had snuck into include/exec/exec-all.h; move it to
include/qom/cpu.h.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This changes a cpu.h dependency for hw/ppc/ppc.h into a cpu-qom.h
dependency. For it to compile we also need to clean up a few unused
definitions.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Make PowerPCCPU an opaque type within cpu-qom.h, and move all definitions
of private methods, as well as all type definitions that require knowledge
of the layout to cpu.h. Conversely, move all definitions needed to define
a class to cpu-qom.h. This helps making files independent of NEED_CPU_H
if they only need to pass around CPU pointers.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Just leave some members in even if they are unused on e.g.
32-bit PPC or user-mode emulation. This avoids complications
when using PowerPCCPUClass in code that is compiled just
once (because it applies to both 32-bit and 64-bit PPC
for example) but still needs to peek at PPC-specific members.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Bring the PowerPCCPUClass handle_mmu_fault method type into line with
the one in CPUClass.
Using vaddr also makes the cpu-qom.h file target independent.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Make cpu-qom.h so that it is only included from cpu.h. Then there
is no need for it to include cpu.h again.
Later we will make cpu-qom.h target independent and we will _want_
to include it from elsewhere, but for now reduce the number of cases
to handle.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
In user mode, there's only a static address translation, TBs are always
invalidated properly and direct jumps are reset when mapping change.
Thus the destination address is always valid for direct jumps and
there's no need to restrict it to the pages the TB resides in.
Signed-off-by: Sergey Fedorov <serge.fdrv@gmail.com>
Signed-off-by: Sergey Fedorov <sergey.fedorov@linaro.org>
Cc: Riku Voipio <riku.voipio@iki.fi>
Cc: Blue Swirl <blauwirbel@gmail.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
We are inconsistent with the type of tb->flags: usage varies loosely
between int and uint64_t. Settle to uint32_t everywhere, which is
superior to both: at least one target (aarch64) uses the most significant
bit in the u32, and uint64_t is wasteful.
Compile-tested for all targets.
Suggested-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Suggested-by: Richard Henderson <rth@twiddle.net>
Tested-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Reviewed-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Message-Id: <1460049562-23517-1-git-send-email-cota@braap.org>
env->xer only holds the lower bits of the XER register nowadays, the
SO, OV and CA bits are stored in separate variables (see the function
cpu_write_xer() for details). Since the migration code currently only
reads the "xer" variable, the upper bits are lost during migration.
Fix it by using cpu_read_xer() instead.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The range checks in the LSWX instruction are completely insufficient:
They do not take the wrap-around case into account, and the check
"reg < rx" should be "reg <= rx" instead. Fix it by using the new
lsw_reg_in_range() helper function that is already used for LSWI, too.
Then there is a second problem: In case the INVAL exception is generated,
the NIP value is wrong, it currently points to the instruction before
the LSWX instruction. This is because gen_lswx() already decreases the
NIP value by 4 (to be prepared for page fault exceptions), and
powerpc_excp() later decreases it again by 4 while handling the program
exception. So to get this right, we've got to undo the "- 4" from
gen_lswx() here before calling helper_raise_exception_err().
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
There are two issues: First, the number of registers that are used has
to be calculated with "(nb + 3) / 4" (i.e. round always up, not down).
Second, the "start <= ra && (start + nr - 32) > ra" condition for the
wrap-around case is wrong: It has to be tested with "||" instead of "&&".
Since we can reuse this check later for the LSWX instruction, let's
place the fixed code into a helper function, too.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This patch fixes the current AIL implementation for POWER8. The
interrupt vector address can be calculated directly from LPCR when the
exception is handled. The excp_prefix update becomes useless and we
can cleanup the H_SET_MODE hcall.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
[clg: Removed LPES0/1 handling for HV vs. !HV
Fixed LPCR_ILE case for POWERPC_EXCP_POWER8 ]
Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
[dwg: This was written as a cleanup, but it also fixes a real bug
where setting an alternative interrupt location would not be
correctly migrated]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
