drv_co_block_status digs bs->file for additional, more accurate search
for hole inside region, reported as DATA by bs since 5daa74a6.

This accuracy is not free: assume we have qcow2 disk. Actually, qcow2
knows, where are holes and where is data. But every block_status
request calls lseek additionally. Assume a big disk, full of
data, in any iterative copying block job (or img convert) we'll call
lseek(HOLE) on every iteration, and each of these lseeks will have to
iterate through all metadata up to the end of file. It's obviously
ineffective behavior. And for many scenarios we don't need this lseek
at all.

However, lseek is needed when we have metadata-preallocated image.

So, let's detect metadata-preallocation case and don't dig qcow2's
protocol file in other cases.

The idea is to compare allocation size in POV of filesystem with
allocations size in POV of Qcow2 (by refcounts). If allocation in fs is
significantly lower, consider it as metadata-preallocation case.

102 iotest changed, as our detector can't detect shrinked file as
metadata-preallocation, which don't seem to be wrong, as with metadata
preallocation we always have valid file length.

Two other iotests have a slight change in their QMP output sequence:
Active 'block-commit' returns earlier because the job coroutine yields
earlier on a blocking operation. This operation is loading the refcount
blocks in qcow2_detect_metadata_preallocation().
Suggested-by: NDenis V. Lunev <den@openvz.org>
Signed-off-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

Block layer may recursively check block_status in file child of qcow2,
if qcow2 driver returned DATA. There are several test cases to check
influence of lseek on block_status performance. To see real difference
run on tmpfs.

Tests originally created by Kevin, I just refactored and put them
together into one executable file with simple output.
Signed-off-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

If the bitmap can't be used for whatever reason, we skip putting down
the reference. Fix that.

In practice, this means that if you attempt to gracefully exit QEMU
after a backup command being rejected, bdrv_close_all will fail and
tell you some unpleasant things via assert().
Reported-by: Naihua liang <aliang@redhat.com>
Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1703916Signed-off-by: NJohn Snow <jsnow@redhat.com>
Reviewed-by: NKevin Wolf <kwolf@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

This tests that concurrent requests are correctly drained before making
graph modifications instead of running into assertions in
bdrv_replace_node().
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
Reviewed-by: NMax Reitz <mreitz@redhat.com>

Instead of just asserting that no requests are in flight in
bdrv_replace_node(), which is a requirement that most callers ignore, we
can just drain the source node right there. This fixes at least starting
a commit job while I/O is active on the backing chain, but probably
other callers, too.

Having requests in flight on the target node isn't a problem because the
target just gets new parents, but the call path of running requests
isn't modified. So we can just drop this assertion without a replacement.

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1711643Signed-off-by: NKevin Wolf <kwolf@redhat.com>
Reviewed-by: NMax Reitz <mreitz@redhat.com>

* Revert q35 to kernel irqchip (Alex)
* edu device fixes (Li Qiang)
* cleanups (Marc-André, Peter)
* Improvements to -accel help
* Better support for IA32_MISC_ENABLE MSR (Wanpeng)
* I2C test conversion to qgraph (Paolo)

# gpg: Signature made Mon 03 Jun 2019 14:20:12 BST
# gpg:                using RSA key BFFBD25F78C7AE83
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>" [full]
# gpg:                 aka "Paolo Bonzini <pbonzini@redhat.com>" [full]
# Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4  E2F7 7E15 100C CD36 69B1
#      Subkey fingerprint: F133 3857 4B66 2389 866C  7682 BFFB D25F 78C7 AE83

* remotes/bonzini/tags/for-upstream: (24 commits)
  q35: Revert to kernel irqchip
  configure: remove tpm_passthrough & tpm_emulator
  ci: store Patchew configuration in the tree
  libqos: i2c: move address into QI2CDevice
  tests: convert ds1338-test to qtest
  tests: convert OMAP i2c tests to qgraph
  libqos: add ARM imx25-pdk machine object
  libqos: add ARM n800 machine object
  libqos: convert I2C to qgraph
  libqos: split I2CAdapter initialization and allocation
  imx25-pdk: create ds1338 for qtest inside the test
  pca9552-test: do not rely on state across tests
  libqos: fix omap-i2c receiving more than 4 bytes
  libqos: move common i2c code to libqos
  qgraph: fix qos_node_contains with options
  qgraph: allow extra_device_opts on contains nodes
  edu: uses uint64_t in dma operation
  edu: mmio: allow 64-bit access in read dispatch
  edu: mmio: allow 64-bit access
  i386: Enable IA32_MISC_ENABLE MWAIT bit when exposing mwait/monitor
  ...
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Commit b2fc91db ("q35: set split kernel irqchip as default") changed
the default for the pc-q35-4.0 machine type to use split irqchip, which
turned out to have disasterous effects on vfio-pci INTx support.  KVM
resampling irqfds are registered for handling these interrupts, but
these are non-functional in split irqchip mode.  We can't simply test
for split irqchip in QEMU as userspace handling of this interrupt is a
significant performance regression versus KVM handling (GeForce GPUs
assigned to Windows VMs are non-functional without forcing MSI mode or
re-enabling kernel irqchip).

The resolution is to revert the change in default irqchip mode in the
pc-q35-4.1 machine and create a pc-q35-4.0.1 machine for the 4.0-stable
branch.  The qemu-q35-4.0 machine type should not be used in vfio-pci
configurations for devices requiring legacy INTx support without
explicitly modifying the VM configuration to use kernel irqchip.

Link: https://bugs.launchpad.net/qemu/+bug/1826422
Fixes: b2fc91db ("q35: set split kernel irqchip as default")
Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>
Reviewed-by: NPeter Xu <peterx@redhat.com>
Message-Id: <155786484688.13873.6037015630912983760.stgit@gimli.home>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

This is a left-over from commit 7aaa6a16 "tpm: express dependencies
with Kconfig".
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20190524181411.8599-1-marcandre.lureau@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Patchew cannot yet retrieve the configuration from the QEMU Git tree, but
this is planned.  In the meanwhile, let's start storing it as YAML
so that the Patchew configuration (currently accessible only to administrators)
is public and documented.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

This removes the hardcoded I2C address from the tests.  The address
is passed via QOSGraphEdgeOptions to i2c_device_create and stored
in the QI2CDevice.

The i2c_send and i2c_recv functions, along with their wrappers,
therefore, can be changed to take a QI2CDevice rather than an
adapter/address pair.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

This way, ds1338-test will run for every machine that exposes
an i2c-bus.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

This way, pca9952-test and tmp105-test will run for every machine
that exposes an i2c-bus.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

This is used to test imx_i2c.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

This is used to test omap_i2c.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Create an i2c-bus interface, corresponding to the I2CAdapter struct.
Wrap IMXI2C and OMAPI2C with a QOSGraphObject, and add the get_driver
function to retrieve the I2CAdapter.

The conversion is still not complete; for simplicity, i2c_recv and
i2c_send (along with their wrappers) still take an adapter/address
pair.  Fixing that would be complicated until the tests are converted
to qgraph, so it is left for after the conversion.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Provide *_init functions that populate an I2CAdapter struct without
allocating one, and make the existing *_create functions wrap them.

Because in the new setup *_create might return a pointer inside the
IMXI2C or OMAPI2C struct, create companion *_free functions to go
back to the outer pointer.

All this is temporary until allocation will be handled entirely by
qgraph.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

There is no need to have a test device created by the board.
Instead, create it in the qtest so that we will be able to run
it on other boards too.
Reviewed-by: NThomas Huth <thuth@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

receive_autoinc is relying on the LED state that is set by
send_and_receive.  Stop doing that, because qgraph resets the
machine between tests.
Reviewed-by: NThomas Huth <thuth@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

If more than 4 bytes are received, the FIFO cannot host the entire
contents of the transfer and STP will be nonzero before entering
the transfer loop.  Also, CNT will contain the number of bytes
left to be transferred instead of the total number of bytes in
the transfer.

(Reverse engineered from the omap_i2c.c source code; no available
datasheet).

This will fix ds1338-test for omap-i2c.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

The functions to read/write 8-bit or 16-bit registers are the same
in tmp105 and pca9552 tests, and in fact they are a special case of
"read block"/"write block" functionality; read block in turn is used
in ds1338-test.

Move everything inside libqos-test, removing the duplication.  Account
for the small differences by adding to tmp105-test.c the "read register
after writing" behavior that is specific to it.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Currently, if qos_node_contains was passed options, it would still
create an edge without any options.  Instead, in that case
NULL acts as a terminator.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Allow choosing the bus that the device will be placed on, in case
the machine has more than one.  Otherwise, the bus may not match
the base address of the controller we attach it to.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

The dma related variable dma.dst/src/cnt is dma_addr_t, it is
uint64_t in x64 platform. Change these usage from uint32_to
uint64_t to avoid trancation in edu_dma_timer.
Signed-off-by: NLi Qiang <liq3ea@163.com>
Message-Id: <20190510164349.81507-4-liq3ea@163.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

The edu spec says when address >= 0x80, the MMIO area can
be accessed by 64-bit.
Signed-off-by: NLi Qiang <liq3ea@163.com>
Reviewed-by: NPhilippe Mathieu-Daude <philmd@redhat.com>
Message-Id: <20190510164349.81507-3-liq3ea@163.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

The edu spec says the MMIO area can be accessed by 64-bit.
However currently the 'max_access_size' is not so the MMIO
access dispatch can only access 32-bit one time. This patch fixes
this to respect the spec.
Signed-off-by: NLi Qiang <liq3ea@163.com>
Reviewed-by: NPhilippe Mathieu-Daude <philmd@redhat.com>
Message-Id: <20190510164349.81507-2-liq3ea@163.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

The CPUID.01H:ECX[bit 3] ought to mirror the value of the MSR
IA32_MISC_ENABLE MWAIT bit and as userspace has control of them
both, it is userspace's job to configure both bits to match on
the initial setup.

Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: NWanpeng Li <wanpengli@tencent.com>
Message-Id: <1557813999-9175-1-git-send-email-wanpengli@tencent.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

It's never used anywhere.
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NPeter Xu <peterx@redhat.com>
Message-Id: <20190520030839.6795-5-peterx@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

According to: https://spdx.org/ids-how, let's still allow QEMU to use
the SPDX license identifier:

// SPDX-License-Identifier: ***

CC: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NPeter Xu <peterx@redhat.com>
Message-Id: <20190426062705.4651-1-peterx@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Currently, -accel help shows all possible accelerators regardless
if they are enabled in the binary or not. That is a different
semantic from -cpu and -machine helps, for example. So this change
makes it to list only the accelerators which support is compiled
in the binary target.

Note that it does not check if the accelerator is enabled in the
host, so the help message's header was rewritten to emphasize
that. Also qtest is not displayed given that it is used for
internal testing purpose only.
Signed-off-by: NWainer dos Santos Moschetta <wainersm@redhat.com>
Message-Id: <20190530215755.328-2-wainersm@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

There is a rare race between the atomic_cmpxchg and
bdrv_aio_cancel/bdrv_aio_cancel_async invocations.  Detect it, the
only sensible we can do about it is to exit long_cb immediately.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

MIPS queue for June 1st, 2019

# gpg: Signature made Sat 01 Jun 2019 19:20:47 BST
# gpg:                using RSA key D4972A8967F75A65
# gpg: Good signature from "Aleksandar Markovic <amarkovic@wavecomp.com>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 8526 FBF1 5DA3 811F 4A01  DD75 D497 2A89 67F7 5A65

* remotes/amarkovic/tags/mips-queue-jun-1-2019:
  target/mips: Improve performance of certain MSA instructions
  target/mips: Clean up lmi_helper.c
  target/mips: Clean up dsp_helper.c
  tests/tcg: target/mips: Add tests for MSA bit set instructions
  target/mips: Amend and cleanup MSA TCG tests
  target/mips: Add emulation of MMI instruction PCPYUD
  target/mips: Add emulation of MMI instruction PCPYLD
  target/mips: Add emulation of MMI instruction PCPYH
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Eliminate loops for better performance.

Following MSA instructions from "UNOP" group are affected:

 - NLZC.<B|H|W|D>
 - NLOC.<B|H|W|D>
 - PCNT.<B|H|W|D>

Following MSA instructions from "BINOP" group are affected:

 - ADD_A.<B|H|W|D>
 - ADDS_A.<B|H|W|D>
 - ADDS_S.<B|H|W|D>
 - ADDS_U.<B|H|W|D>
 - ADDV.<B|H|W|D>
 - ASUB_S.<B|H|W|D>
 - ASUB_U.<B|H|W|D>
 - AVE_S.<B|H|W|D>
 - AVE_U.<B|H|W|D>
 - AVER_S.<B|H|W|D>
 - AVER_U.<B|H|W|D>
 - BCLR.<B|H|W|D>
 - BNEG.<B|H|W|D>
 - BSET.<B|H|W|D>
 - CEQ.<B|H|W|D>
 - CLE_S.<B|H|W|D>
 - CLE_U.<B|H|W|D>
 - CLT_S.<B|H|W|D>
 - CLT_U.<B|H|W|D>
 - DIV_S.<B|H|W|D>
 - DIV_U.<B|H|W|D>
 - DOTP_S.<B|H|W|D>
 - DOTP_U.<B|H|W|D>
 - HADD_S.<B|H|W|D>
 - HADD_U.<B|H|W|D>
 - HSUB_S.<B|H|W|D>
 - HSUB_U.<B|H|W|D>
 - MAX_A.<B|H|W|D>
 - MAX_S.<B|H|W|D>
 - MAX_U.<B|H|W|D>
 - MIN_A.<B|H|W|D>
 - MIN_S.<B|H|W|D>
 - MIN_U.<B|H|W|D>
 - MOD_S.<B|H|W|D>
 - MOD_U.<B|H|W|D>
 - MUL_Q.<B|H|W|D>
 - MULR_Q.<B|H|W|D>
 - MULV.<B|H|W|D>
 - SLL.<B|H|W|D>
 - SRA.<B|H|W|D>
 - SRAR.<B|H|W|D>
 - SRL.<B|H|W|D>
 - SRLR.<B|H|W|D>
 - SUBS_S.<B|H|W|D>
 - SUBS_U.<B|H|W|D>
 - SUBSUS_U.<B|H|W|D>
 - SUBSUU_S.<B|H|W|D>
 - SUBV.<B|H|W|D>

Following MSA instructions from "TEROP" group are affected:

 - BINSL.<B|H|W|D>
 - BINSR.<B|H|W|D>
 - DPADD_S.<B|H|W|D>
 - DPADD_U.<B|H|W|D>
 - DPSUB_S.<B|H|W|D>
 - DPSUB_U.<B|H|W|D>
 - MADD_Q.<B|H|W|D>
 - MADDR_Q.<B|H|W|D>
 - MADDV.<B|H|W|D>
 - MSUB_Q.<B|H|W|D>
 - MSUBR_Q.<B|H|W|D>
 - MSUBV.<B|H|W|D>

Additionally, following MSA instructionas are also affected:

 - ILVL.<B|H|W|D>
 - ILVR.<B|H|W|D>
 - ILVEV.<B|H|W|D>
 - ILVOD.<B|H|W|D>
 - PCKEV.<B|H|W|D>
 - PCKOD.<B|H|W|D>
Signed-off-by: NMateja Marjanovic <mateja.marjanovic@rt-rk.com>
Signed-off-by: NAleksandar Markovic <amarkovic@wavecomp.com>
Reviewed-by: NAleksandar Markovic <amarkovic@wavecomp.com>
Message-Id: <1551718283-4487-2-git-send-email-mateja.marjanovic@rt-rk.com>

Remove several minor checkpatch warnings and errors.
Signed-off-by: NAleksandar Markovic <amarkovic@wavecomp.com>
Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <1556018982-3715-7-git-send-email-aleksandar.markovic@rt-rk.com>

Remove several minor checkpatch warnings and errors.
Signed-off-by: NAleksandar Markovic <amarkovic@wavecomp.com>
Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <1556018982-3715-6-git-send-email-aleksandar.markovic@rt-rk.com>

Add tests for MSA bit set instructions. This includes following
instructions:

  * BCLR.B - clear bit (bytes)
  * BCLR.H - clear bit (halfwords)
  * BCLR.W - clear bit (words)
  * BCLR.D - clear bit (doublewords)
  * BNEG.B - negate bit (bytes)
  * BNEG.H - negate bit (halfwords)
  * BNEG.W - negate bit (words)
  * BNEG.D - negate bit (doublewords)
  * BSET.B - set bit (bytes)
  * BSET.H - set bit (halfwords)
  * BSET.W - set bit (words)
  * BSET.D - set bit (doublewords)
Signed-off-by: NAleksandar Markovic <amarkovic@wavecomp.com>
Reviewed-by: NAleksandar Rikalo <arikalo@wavecomp.com>
Message-Id: <1555699081-24577-5-git-send-email-aleksandar.markovic@rt-rk.com>

Add missing bits and peaces of the tests of the emulation of certain
MSA (non-immediate variants): some tests were missing two last cases;
some instructions were missing wrappers; some test included wrong
headers; some tests were missing altogether; updated some copywright
preambles; do several other minor cleanups.
Signed-off-by: NAleksandar Markovic <amarkovic@wavecomp.com>
Signed-off-by: NMateja Marjanovic <mateja.marjanovic@rt-rk.com>
Reviewed-by: NAleksandar Rikalo <arikalo@wavecomp.com>
Message-Id: <1555699081-24577-4-git-send-email-aleksandar.markovic@rt-rk.com>

Add emulation of MMI instruction PCPYUD. The emulation is implemented
using TCG front end operations directly to achieve better performance.
Signed-off-by: NMateja Marjanovic <mateja.marjanovic@rt-rk.com>
Signed-off-by: NAleksandar Markovic <amarkovic@wavecomp.com>
Reviewed-by: NAleksandar Rikalo <arikalo@wavecomp.com>
Message-Id: <1551712405-2530-4-git-send-email-mateja.marjanovic@rt-rk.com>

Add emulation of MMI instruction PCPYLD. The emulation is implemented
using TCG front end operations directly to achieve better performance.
Signed-off-by: NMateja Marjanovic <mateja.marjanovic@rt-rk.com>
Signed-off-by: NAleksandar Markovic <amarkovic@wavecomp.com>
Reviewed-by: NAleksandar Rikalo <arikalo@wavecomp.com>
Message-Id: <1551712405-2530-3-git-send-email-mateja.marjanovic@rt-rk.com>

Add emulation of MMI instruction PCPYH. The emulation is implemented
using TCG front end operations directly to achieve better performance.
Signed-off-by: NMateja Marjanovic <mateja.marjanovic@rt-rk.com>
Signed-off-by: NAleksandar Markovic <amarkovic@wavecomp.com>
Reviewed-by: NAleksandar Rikalo <arikalo@wavecomp.com>
Message-Id: <1551712405-2530-2-git-send-email-mateja.marjanovic@rt-rk.com>

ppc patch queue 2019-05-29

Next pull request against qemu-4.1.  Highlights:
  * KVM accelerated support for the XIVE interrupt controller in PAPR
    guests
  * A number of TCG vector fixes
  * Fixes for the PReP / 40p machine
  * Improvements to make check-tcg test coverage

Other than that it's just a bunch of assorted fixes, cleanups and
minor improvements.

This supersedes both the pull request dated 2019-05-21 and the one
dated 2019-05-22.  I've dropped one hunk which I think may have caused
the check-tcg failure that Peter saw (by enabling the ppc64abi32
build, which I think has been broken for ages).  I'm not entirely
certain, since I haven't reproduced exactly the same failure.

# gpg: Signature made Wed 29 May 2019 07:49:04 BST
# gpg:                using RSA key 75F46586AE61A66CC44E87DC6C38CACA20D9B392
# gpg: Good signature from "David Gibson <david@gibson.dropbear.id.au>" [full]
# gpg:                 aka "David Gibson (Red Hat) <dgibson@redhat.com>" [full]
# gpg:                 aka "David Gibson (ozlabs.org) <dgibson@ozlabs.org>" [full]
# gpg:                 aka "David Gibson (kernel.org) <dwg@kernel.org>" [unknown]
# Primary key fingerprint: 75F4 6586 AE61 A66C C44E  87DC 6C38 CACA 20D9 B392

* remotes/dgibson/tags/ppc-for-4.1-20190529: (44 commits)
  ppc/pnv: add dummy XSCOM registers for PRD initialization
  ppc/pnv: introduce new skiboot platform properties
  spapr: Don't migrate the hpt_maxpagesize cap to older machine types
  spapr: change default interrupt mode to 'dual'
  spapr/xive: fix multiple resets when using the 'dual' interrupt mode
  docs: provide documentation on the POWER9 XIVE interrupt controller
  spapr/irq: add KVM support to the 'dual' machine
  ppc/xics: fix irq priority in ics_set_irq_type()
  spapr/irq: initialize the IRQ device only once
  spapr/irq: introduce a spapr_irq_init_device() helper
  spapr: check for the activation of the KVM IRQ device
  spapr: introduce routines to delete the KVM IRQ device
  sysbus: add a sysbus_mmio_unmap() helper
  spapr/xive: activate KVM support
  spapr/xive: add migration support for KVM
  spapr/xive: introduce a VM state change handler
  spapr/xive: add state synchronization with KVM
  spapr/xive: add hcall support when under KVM
  spapr/xive: add KVM support
  spapr: Print out extra hints when CAS negotiation of interrupt mode fails
  ...
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>