host since it may cause inode number collision and mayhem in the guest.
A new fsdev property is added for the user to choose the appropriate
policy to handle that: either remap all inode numbers or fail I/Os to
another host device or just print out a warning (default behaviour).
This is also my last PR as _active_ maintainer of 9pfs.
-----BEGIN PGP SIGNATURE-----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=TqfQ
-----END PGP SIGNATURE-----
Merge remote-tracking branch 'remotes/gkurz/tags/9p-next-2019-10-10' into staging
The most notable change is that we now detect cross-device setups in the
host since it may cause inode number collision and mayhem in the guest.
A new fsdev property is added for the user to choose the appropriate
policy to handle that: either remap all inode numbers or fail I/Os to
another host device or just print out a warning (default behaviour).
This is also my last PR as _active_ maintainer of 9pfs.
# gpg: Signature made Thu 10 Oct 2019 12:14:07 BST
# gpg: using RSA key B4828BAF943140CEF2A3491071D4D5E5822F73D6
# gpg: Good signature from "Greg Kurz <groug@kaod.org>" [full]
# gpg: aka "Gregory Kurz <gregory.kurz@free.fr>" [full]
# gpg: aka "[jpeg image of size 3330]" [full]
# Primary key fingerprint: B482 8BAF 9431 40CE F2A3 4910 71D4 D5E5 822F 73D6
* remotes/gkurz/tags/9p-next-2019-10-10:
MAINTAINERS: Downgrade status of virtio-9p to "Odd Fixes"
9p: Use variable length suffixes for inode remapping
9p: stat_to_qid: implement slow path
9p: Added virtfs option 'multidevs=remap|forbid|warn'
9p: Treat multiple devices on one export as an error
fsdev: Add return value to fsdev_throttle_parse_opts()
9p: Simplify error path of v9fs_device_realize_common()
9p: unsigned type for type, version, path
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
The following guest behaviour patter leads to double free in VFIO PCI:
1. Guest enables MSI interrupts
vfio_msi_enable is called, but fails in vfio_enable_vectors.
In our case this was because VFIO GPU device was in D3 state.
Unhappy path in vfio_msi_enable will g_free(vdev->msi_vectors) but not
set this pointer to NULL
2. Guest still sees MSI an enabled after that because emulated config
write is done in vfio_pci_write_config unconditionally before calling
vfio_msi_enable
3. Guest disables MSI interrupts
vfio_msi_disable is called and tries to g_free(vdev->msi_vectors)
in vfio_msi_disable_common => double free
Signed-off-by: Evgeny Yakovlev <wrfsh@yandex-team.ru>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Use variable length suffixes for inode remapping instead of the fixed
16 bit size prefixes before. With this change the inode numbers on guest
will typically be much smaller (e.g. around >2^1 .. >2^7 instead of >2^48
with the previous fixed size inode remapping.
Additionally this solution is more efficient, since inode numbers in
practice can take almost their entire 64 bit range on guest as well, so
there is less likely a need for generating and tracking additional suffixes,
which might also be beneficial for nested virtualization where each level of
virtualization would shift up the inode bits and increase the chance of
expensive remapping actions.
The "Exponential Golomb" algorithm is used as basis for generating the
variable length suffixes. The algorithm has a parameter k which controls the
distribution of bits on increasing indeces (minimum bits at low index vs.
maximum bits at high index). With k=0 the generated suffixes look like:
Index Dec/Bin -> Generated Suffix Bin
1 [1] -> [1] (1 bits)
2 [10] -> [010] (3 bits)
3 [11] -> [110] (3 bits)
4 [100] -> [00100] (5 bits)
5 [101] -> [10100] (5 bits)
6 [110] -> [01100] (5 bits)
7 [111] -> [11100] (5 bits)
8 [1000] -> [0001000] (7 bits)
9 [1001] -> [1001000] (7 bits)
10 [1010] -> [0101000] (7 bits)
11 [1011] -> [1101000] (7 bits)
12 [1100] -> [0011000] (7 bits)
...
65533 [1111111111111101] -> [1011111111111111000000000000000] (31 bits)
65534 [1111111111111110] -> [0111111111111111000000000000000] (31 bits)
65535 [1111111111111111] -> [1111111111111111000000000000000] (31 bits)
Hence minBits=1 maxBits=31
And with k=5 they would look like:
Index Dec/Bin -> Generated Suffix Bin
1 [1] -> [000001] (6 bits)
2 [10] -> [100001] (6 bits)
3 [11] -> [010001] (6 bits)
4 [100] -> [110001] (6 bits)
5 [101] -> [001001] (6 bits)
6 [110] -> [101001] (6 bits)
7 [111] -> [011001] (6 bits)
8 [1000] -> [111001] (6 bits)
9 [1001] -> [000101] (6 bits)
10 [1010] -> [100101] (6 bits)
11 [1011] -> [010101] (6 bits)
12 [1100] -> [110101] (6 bits)
...
65533 [1111111111111101] -> [0011100000000000100000000000] (28 bits)
65534 [1111111111111110] -> [1011100000000000100000000000] (28 bits)
65535 [1111111111111111] -> [0111100000000000100000000000] (28 bits)
Hence minBits=6 maxBits=28
Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Signed-off-by: Greg Kurz <groug@kaod.org>
stat_to_qid attempts via qid_path_prefixmap to map unique files (which are
identified by 64 bit inode nr and 32 bit device id) to a 64 QID path value.
However this implementation makes some assumptions about inode number
generation on the host.
If qid_path_prefixmap fails, we still have 48 bits available in the QID
path to fall back to a less memory efficient full mapping.
Signed-off-by: Antonios Motakis <antonios.motakis@huawei.com>
[CS: - Rebased to https://github.com/gkurz/qemu/commits/9p-next
(SHA1 7fc4c49e91).
- Updated hash calls to new xxhash API.
- Removed unnecessary parantheses in qpf_lookup_func().
- Removed unnecessary g_malloc0() result checks.
- Log error message when running out of prefixes in
qid_path_fullmap().
- Log warning message about potential degraded performance in
qid_path_prefixmap().
- Wrapped qpf_table initialization to dedicated qpf_table_init()
function.
- Fixed typo in comment. ]
Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Signed-off-by: Greg Kurz <groug@kaod.org>
'warn' (default): Only log an error message (once) on host if more than one
device is shared by same export, except of that just ignore this config
error though. This is the default behaviour for not breaking existing
installations implying that they really know what they are doing.
'forbid': Like 'warn', but except of just logging an error this
also denies access of guest to additional devices.
'remap': Allows to share more than one device per export by remapping
inodes from host to guest appropriately. To support multiple devices on the
9p share, and avoid qid path collisions we take the device id as input to
generate a unique QID path. The lowest 48 bits of the path will be set
equal to the file inode, and the top bits will be uniquely assigned based
on the top 16 bits of the inode and the device id.
Signed-off-by: Antonios Motakis <antonios.motakis@huawei.com>
[CS: - Rebased to https://github.com/gkurz/qemu/commits/9p-next
(SHA1 7fc4c49e91).
- Added virtfs option 'multidevs', original patch simply did the inode
remapping without being asked.
- Updated hash calls to new xxhash API.
- Updated docs for new option 'multidevs'.
- Fixed v9fs_do_readdir() not having remapped inodes.
- Log error message when running out of prefixes in
qid_path_prefixmap().
- Fixed definition of QPATH_INO_MASK.
- Wrapped qpp_table initialization to dedicated qpp_table_init()
function.
- Dropped unnecessary parantheses in qpp_lookup_func().
- Dropped unnecessary g_malloc0() result checks. ]
Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
[groug: - Moved "multidevs" parsing to the local backend.
- Added hint to invalid multidevs option error.
- Turn "remap" into "x-remap". ]
Signed-off-by: Greg Kurz <groug@kaod.org>
The QID path should uniquely identify a file. However, the
inode of a file is currently used as the QID path, which
on its own only uniquely identifies files within a device.
Here we track the device hosting the 9pfs share, in order
to prevent security issues with QID path collisions from
other devices.
We only print a warning for now but a subsequent patch will
allow users to have finer control over the desired behaviour.
Failing the I/O will be one the proposed behaviour, so we
also change stat_to_qid() to return an error here in order to
keep other patches simpler.
Signed-off-by: Antonios Motakis <antonios.motakis@huawei.com>
[CS: - Assign dev_id to export root's device already in
v9fs_device_realize_common(), not postponed in
stat_to_qid().
- error_report_once() if more than one device was
shared by export.
- Return -ENODEV instead of -ENOSYS in stat_to_qid().
- Fixed typo in log comment. ]
Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
[groug, changed to warning, updated message and changelog]
Signed-off-by: Greg Kurz <groug@kaod.org>
It is more convenient to use the return value of the function to notify
errors, rather than to be tied up setting up the &local_err boilerplate.
Signed-off-by: Greg Kurz <groug@kaod.org>
There is no need for signedness on these QID fields for 9p.
Signed-off-by: Antonios Motakis <antonios.motakis@huawei.com>
[CS: - Also make QID type unsigned.
- Adjust donttouch_stat() to new types.
- Adjust trace-events to new types. ]
Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Signed-off-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Anton Nefedov <anton.nefedov@virtuozzo.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-id: 20190923121737.83281-8-anton.nefedov@virtuozzo.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This will help to account the operation in the following commit.
The difference is that we don't call scsi_disk_req_check_error() before
the 1st discard iteration anymore. That function also checks if
the request is cancelled, however it shouldn't get canceled until it
yields in blk_aio() functions anyway.
Same approach is already used for emulate_write_same.
Signed-off-by: Anton Nefedov <anton.nefedov@virtuozzo.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Message-id: 20190923121737.83281-7-anton.nefedov@virtuozzo.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
it allows to report it in the error handler
Signed-off-by: Anton Nefedov <anton.nefedov@virtuozzo.com>
Message-id: 20190923121737.83281-6-anton.nefedov@virtuozzo.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Anton Nefedov <anton.nefedov@virtuozzo.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-id: 20190923121737.83281-5-anton.nefedov@virtuozzo.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This is no longer used, and many of the existing uses -- particularly
within hw/s390x -- seem questionable.
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20191001171614.8405-4-richard.henderson@linaro.org>
Signed-off-by: David Hildenbrand <david@redhat.com>
Setup the 4.1 compatibility model so we can add new features to the
LATEST model.
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
virtio_notify_config() needs to acquire the global mutex, which isn't
allowed from an iothread, and may lead to a deadlock like this:
- main thead
* Has acquired: qemu_global_mutex.
* Is trying the acquire: iothread AioContext lock via
AIO_WAIT_WHILE (after aio_poll).
- iothread
* Has acquired: AioContext lock.
* Is trying to acquire: qemu_global_mutex (via
virtio_notify_config->prepare_mmio_access).
If virtio_blk_resize() is called from an iothread, schedule
virtio_notify_config() to be run in the main context BH.
[Removed unnecessary newline as suggested by Kevin Wolf
<kwolf@redhat.com>.
--Stefan]
Signed-off-by: Sergio Lopez <slp@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-id: 20190916112411.21636-1-slp@redhat.com
Message-Id: <20190916112411.21636-1-slp@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Here's the next batch of ppc and spapr patches. Includes:
* Fist part of a large cleanup to irq infrastructure
* Recreate the full FDT at CAS time, instead of making a difficult
to follow set of updates. This will help us move towards
eliminating CAS reboots altogether
* No longer provide RTAS blob to SLOF - SLOF can include it just as
well itself, since guests will generally need to relocate it with
a call to instantiate-rtas
* A number of DFP fixes and cleanups from Mark Cave-Ayland
* Assorted bugfixes
* Several new small devices for powernv
-----BEGIN PGP SIGNATURE-----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=PXXe
-----END PGP SIGNATURE-----
Merge remote-tracking branch 'remotes/dgibson/tags/ppc-for-4.2-20191004' into staging
ppc patch queue 2019-10-04
Here's the next batch of ppc and spapr patches. Includes:
* Fist part of a large cleanup to irq infrastructure
* Recreate the full FDT at CAS time, instead of making a difficult
to follow set of updates. This will help us move towards
eliminating CAS reboots altogether
* No longer provide RTAS blob to SLOF - SLOF can include it just as
well itself, since guests will generally need to relocate it with
a call to instantiate-rtas
* A number of DFP fixes and cleanups from Mark Cave-Ayland
* Assorted bugfixes
* Several new small devices for powernv
# gpg: Signature made Fri 04 Oct 2019 10:35:57 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-4.2-20191004: (53 commits)
ppc/pnv: Remove the XICSFabric Interface from the POWER9 machine
spapr: Eliminate SpaprIrq::init hook
spapr: Add return value to spapr_irq_check()
spapr: Use less cryptic representation of which irq backends are supported
xive: Improve irq claim/free path
spapr, xics, xive: Better use of assert()s on irq claim/free paths
spapr: Handle freeing of multiple irqs in frontend only
spapr: Remove unhelpful tracepoints from spapr_irq_free_xics()
spapr: Eliminate SpaprIrq:get_nodename method
spapr: Simplify spapr_qirq() handling
spapr: Fix indexing of XICS irqs
spapr: Eliminate nr_irqs parameter to SpaprIrq::init
spapr: Clarify and fix handling of nr_irqs
spapr: Replace spapr_vio_qirq() helper with spapr_vio_irq_pulse() helper
spapr: Fold spapr_phb_lsi_qirq() into its single caller
xics: Create sPAPR specific ICS subtype
xics: Merge TYPE_ICS_BASE and TYPE_ICS_SIMPLE classes
xics: Eliminate reset hook
xics: Rename misleading ics_simple_*() functions
xics: Eliminate 'reject', 'resend' and 'eoi' class hooks
...
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Currently, when a notifier is attempted to be registered and its
flags are not supported (especially the MAP one) by the IOMMU MR,
we generally abruptly exit in the IOMMU code. The failure could be
handled more nicely in the caller and especially in the VFIO code.
So let's allow memory_region_register_iommu_notifier() to fail as
well as notify_flag_changed() callback.
All sites implementing the callback are updated. This patch does
not yet remove the exit(1) in the amd_iommu code.
in SMMUv3 we turn the warning message into an error message saying
that the assigned device would not work properly.
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
The container error integer field is currently used to store
the first error potentially encountered during any
vfio_listener_region_add() call. However this fails to propagate
detailed error messages up to the vfio_connect_container caller.
Instead of using an integer, let's use an Error handle.
Messages are slightly reworded to accomodate the propagation.
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Bottom halves and ptimers are malloced, but nothing in these
files is freeing memory allocated by instance_init. Since
these are sysctl devices that are never unrealized, just moving
the allocations to realize is enough to avoid the leak in
practice (and also to avoid upsetting asan when running
device-introspect-test).
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
memory_region_init_* takes care of copying the name into memory it owns.
Free it in the caller.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
The array returned by qemu_allocate_irqs is malloced, free it.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
The device tree blob returned by load_device_tree is malloced.
Free it before returning.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
The array returned by qemu_allocate_irqs is malloced, free it.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Currently, isa-superio.c is always compiled as soon as CONFIG_ISA_BUS
is enabled. But there are also machines that have an ISA BUS without
any of the superio chips attached to it, so we should not compile
isa-superio.c in case we only compile a QEMU for such a machine.
Thus add a proper CONFIG_ISA_SUPERIO switch so that this file only gets
compiled when we really, really need it.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
The POWER8 PowerNV machine needs to implement a XICSFabric interface
as this is the POWER8 interrupt controller model. But the POWER9
machine uselessly inherits of XICSFabric from the common PowerNV
machine definition.
Open code machine definitions to have a better control on the
different interfaces each machine should define.
Fixes: f30c843ced ("ppc/pnv: Introduce PowerNV machines with fixed CPU models")
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191003143617.21682-1-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This method is used to set up the interrupt backends for the current
configuration. However, this means some confusing redirection between
the "dual" mode init and the init hooks for xics only and xive only modes.
Since we now have simple flags indicating whether XICS and/or XIVE are
supported, it's easier to just open code each initialization directly in
spapr_irq_init(). This will also make some future cleanups simpler.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
Explicitly return success or failure, rather than just relying on the
Error ** parameter. This makes handling it less verbose in the caller.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
SpaprIrq::ov5 stores the value for a particular byte in PAPR option vector
5 which indicates whether XICS, XIVE or both interrupt controllers are
available. As usual for PAPR, the encoding is kind of overly complicated
and confusing (though to be fair there are some backwards compat things it
has to handle).
But to make our internal code clearer, have SpaprIrq encode more directly
which backends are available as two booleans, and derive the OV5 value from
that at the point we need it.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
spapr_xive_irq_claim() returns a bool to indicate if it succeeded.
But most of the callers and one callee use int return values and/or an
Error * with more information instead. In any case, ints are a more
common idiom for success/failure states than bools (one never knows
what sense they'll be in).
So instead change to an int return value to indicate presence of error
+ an Error * to describe the details through that call chain.
It also didn't actually check if the irq was already claimed, which is
one of the primary purposes of the claim path, so do that.
spapr_xive_irq_free() also returned a bool... which no callers checked
and was always true, so just drop it.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
The irq claim and free paths for both XICS and XIVE check for some
validity conditions. Some of these represent genuine runtime failures,
however others - particularly checking that the basic irq number is in a
sane range - could only fail in the case of bugs in the callin code.
Therefore use assert()s instead of runtime failures for those.
In addition the non backend-specific part of the claim/free paths should
only be used for PAPR external irqs, that is in the range SPAPR_XIRQ_BASE
to the maximum irq number. Put assert()s for that into the top level
dispatchers as well.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
spapr_irq_free() can be used to free multiple irqs at once. That's useful
for its callers, but there's no need to make the individual backend hooks
handle this. We can loop across the irqs in spapr_irq_free() itself and
have the hooks just do one at time.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
These traces contain some useless information (the always-0 source#) and
have no equivalents for XIVE mode. For now just remove them, and we can
put back something more sensible if and when we need it.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
This method is used to determine the name of the irq backend's node in the
device tree, so that we can find its phandle (after SLOF may have modified
it from the phandle we initially gave it).
But, in the two cases the only difference between the node name is the
presence of a unit address. Searching for a node name without considering
unit address is standard practice for the device tree, and
fdt_subnode_offset() will do exactly that, making this method unecessary.
While we're there, remove the XICS_NODENAME define. The name
"interrupt-controller" is required by PAPR (and IEEE1275), and a bunch of
places assume it already.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Currently spapr_qirq(), whic is used to find the qemu_irq for an spapr
global irq number, redirects through the SpaprIrq::qirq method. But
the array of qemu_irqs is allocated in the PAPR layer, not the
backends, and so the method implementations all return the same thing,
just differing in the preliminary checks they make.
So, we can remove the method, and just implement spapr_qirq() directly,
including all the relevant checks in one place. We change all those
checks into assert()s as well, since a failure here indicates an error in
the calling code.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
spapr global irq numbers are different from the source numbers on the ICS
when using XICS - they're offset by XICS_IRQ_BASE (0x1000). But
spapr_irq_set_irq_xics() was passing through the global irq number to
the ICS code unmodified.
We only got away with this because of a counteracting bug - we were
incorrectly adjusting the qemu_irq we returned for a requested global irq
number.
That approach mostly worked but is very confusing, incorrectly relies on
the way the qemu_irq array is allocated, and undermines the intention of
having the global array of qemu_irqs for spapr have a consistent meaning
regardless of irq backend.
So, fix both set_irq and qemu_irq indexing. We rename some parameters at
the same time to make it clear that they are referring to spapr global
irq numbers.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
The only reason this parameter was needed was to work around the
inconsistent meaning of nr_irqs between xics and xive. Now that we've
fixed that, we can consistently use the number directly in the SpaprIrq
configuration.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
Both the XICS and XIVE interrupt backends have a "nr-irqs" property, but
it means slightly different things. For XICS (or, strictly, the ICS) it
indicates the number of "real" external IRQs. Those start at XICS_IRQ_BASE
(0x1000) and don't include the special IPI vector. For XIVE, however, it
includes the whole IRQ space, including XIVE's many IPI vectors.
The spapr code currently doesn't handle this sensibly, with the
nr_irqs value in SpaprIrq having different meanings depending on the
backend. We fix this by renaming nr_irqs to nr_xirqs and making it
always indicate just the number of external irqs, adjusting the value
we pass to XIVE accordingly. We also move to using common constants
in most of the irq configurations, to make it clearer that the IRQ
space looks the same to the guest (and emulated devices), even if the
backend is different.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Every caller of spapr_vio_qirq() immediately calls qemu_irq_pulse() with
the result, so we might as well just fold that into the helper.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
No point having a two-line helper that's used exactly once, and not likely
to be used anywhere else in future.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
We create a subtype of TYPE_ICS specifically for sPAPR. For now all this
does is move the setup of the PAPR specific hcalls and RTAS calls to
the realize() function for this, rather than requiring the PAPR code to
explicitly call xics_spapr_init(). In future it will have some more
function.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
TYPE_ICS_SIMPLE is the only subtype of TYPE_ICS_BASE that's ever
instantiated. The existence of different classes is mostly a hang
over from when we (misguidedly) had separate subtypes for the KVM and
non-KVM version of the device.
There could be some call for an abstract base type for ICS variants
that use a different representation of their state (PowerNV PHB3 might
want this). The current split isn't really in the right place for
that though. If we need this in future, we can re-implement it more
in line with what we actually need.
So, collapse the two classes together into just TYPE_ICS.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
Currently TYPE_XICS_BASE and TYPE_XICS_SIMPLE have their own reset methods,
using the standard technique for having the subtype call the supertype's
methods before doing its own thing.
But TYPE_XICS_SIMPLE is the only subtype of TYPE_XICS_BASE ever
instantiated, so there's no point having the split here. Merge them
together into just an ics_reset() function.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
There are a number of ics_simple_*() functions that aren't actually
specific to TYPE_XICS_SIMPLE at all, and are equally valid on
TYPE_XICS_BASE. Rename them to ics_*() accordingly.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
Currently ics_reject(), ics_resend() and ics_eoi() indirect through
class methods. But there's only one implementation of each method,
the one in TYPE_ICS_SIMPLE. TYPE_ICS_BASE has no implementation, but
it's never instantiated, and has no other subtypes.
So clean up by eliminating the method and just having ics_reject(),
ics_resend() and ics_eoi() contain the logic directly.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
When vCPUs are hotplugged, they are added to the QEMU CPU list before
being fully realized. This can crash the XIVE presenter because the
'tctx' pointer is not necessarily initialized when looking for a
matching target.
These vCPUs are not valid targets for the presenter. Skip them.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191001085722.32755-1-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Greg Kurz <groug@kaod.org>
The ibm,client-architecture-support call is a way for the guest to
negotiate capabilities with a hypervisor. It is implemented as:
- the guest calls SLOF via client interface;
- SLOF calls QEMU (H_CAS hypercall) with an options vector from the guest;
- QEMU returns a device tree diff (which uses FDT format with
an additional header before it);
- SLOF walks through the partial diff tree and updates its internal tree
with the values from the diff.
This changes QEMU to simply re-render the entire tree and send it as
an update. SLOF can handle this already mostly, [1] is needed before this
can be applied. This stores the resulting tree in the spapr machine to have
the latest valid FDT copy possible (this should not matter much as
H_UPDATE_DT happens right after that but nevertheless).
The benefit is reduced code size as there is no need for another set of
DT rendering helpers such as spapr_fixup_cpu_dt().
The downside is that the updates are bigger now (as they include all
nodes and properties) but the difference on a '-smp 256,threads=1' system
before/after is 2.35s vs. 2.5s.
[1] https://patchwork.ozlabs.org/patch/1152915/
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
