In all of these cases, the uses of strncpy were unnecessary, since
at each point of use we know that the NUL-terminated source bytes
fit in the destination buffer. Use memcpy in place of strncpy.
Acked-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Jim Meyering <meyering@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
In bt_hci_name_req a failed snprintf could return len larger than
sizeof(params.name), which means the following memset call would
have a "length" value of (size_t)-1, -2, etc... Sounds scary.
But currently, one can deduce that there is no problem:
strlen(slave->lmp_name) is guaranteed to be smaller than
CHANGE_LOCAL_NAME_CP_SIZE, which is the same as sizeof(params.name),
so this cannot happen. Regardless, there is no justification for
using snprintf+memset. Use pstrcpy instead.
Also, in bt_hci_event_complete_read_local_name, use pstrcpy in place
of unwarranted strncpy.
Signed-off-by: Jim Meyering <meyering@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Don't bother with strncpy. There's no need for its zero-fill.
Use g_strndup in place of g_malloc+strncpy+NUL-terminate.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Jim Meyering <meyering@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Remove two uses of strdup (use g_path_get_basename instead),
and add a comment that this strncpy use is ok.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Jim Meyering <meyering@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
A terminal NUL is required by caller's use of strchr.
It's better not to use strncpy at all, since there is no need
to zero out hundreds of trailing bytes for each iteration.
Signed-off-by: Jim Meyering <meyering@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
os_set_proc_name: Use pstrcpy, in place of strncpy and the
ineffectual preceding assignment: name[sizeof(name) - 1] = 0;
Signed-off-by: Jim Meyering <meyering@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Actually do what the comment says, using pstrcpy NUL-terminate:
strncpy does not always do that.
Signed-off-by: Jim Meyering <meyering@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
v9fs_add_dir_node and qemu_v9fs_synth_add_file used strncpy
to form node->name, which requires NUL-termination, but
strncpy does not ensure NUL-termination.
Use pstrcpy, which does.
Acked-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Jim Meyering <meyering@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Avoid strncpy+manual-NUL-terminate. Use pstrcpy instead.
Acked-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Jim Meyering <meyering@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
* parse_vdiname: Use pstrcpy, not strncpy, when the destination
buffer must be NUL-terminated.
* sd_open: Likewise, avoid buffer overrun.
* do_sd_create: Likewise. Leave the preceding memset, since
pstrcpy does not NUL-fill, and filename needs that.
* sd_snapshot_create: Add a comment/question.
* find_vdi_name: Remove a useless memset.
* sd_snapshot_goto: Remove a useless memset.
Use pstrcpy to NUL-terminate, because find_vdi_name requires
that its vdi arg (filename parameter) be NUL-terminated.
It seems ok not to NUL-fill the buffer.
Do the same for snapid: remove useless memset-0 (instead,
zero tag[0]). Use pstrcpy, not strncpy.
* sd_snapshot_list: Use pstrcpy, not strncpy to write
into the ->name member. Each must be NUL-terminated.
Acked-by: Kevin Wolf <kwolf@redhat.com>
Acked-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp>
Signed-off-by: Jim Meyering <meyering@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Also, use PATH_MAX, rather than the arbitrary 1024.
Using PATH_MAX is more consistent with other filename-related
variables in this file, like backing_filename and tmp_filename.
Acked-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Jim Meyering <meyering@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This avoids a NULL-deref upon strdup failure.
Also update matching free to g_free.
Signed-off-by: Jim Meyering <meyering@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Use g_strdup rather than strdup, because the sole caller
(qdev_get_fw_dev_path_helper) assumes it gets non-NULL, and dereferences
it. Besides, in that caller, the allocated buffer is already freed with
g_free, so it's better to allocate with a matching g_strdup.
In one case, (scsi-bus.c) it was trivial, so I replaced an snprintf+
g_strdup combination with an equivalent g_strdup_printf use.
Signed-off-by: Jim Meyering <meyering@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
setsockopt needs a type cast for MinGW. That type cast is missing in
a recent commit which results in a compiler warning.
Like for other socket related functions which have the same problem,
we add a 'qemu_setsockopt' macro which provides that type cast where
needed and use the new macro to avoid the warning.
A 'qemu_getsockopt' is also added and can be used for future
modifications.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
Use the recently introduced tcg_out_mov_reg() function rather than
the equivalent inline code.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
Contrary to its name, 'qemu_global_mutex' is only used locally
in cpus.c.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
Specifying an empty target list with --target-list= is shorter
than specifying --disable-user --disable-system.
Both variants should give the same result: no targets at all.
This modification implements that feature.
It uses a trick which works with POSIX compliant shells to test whether
target_list is undefined (=> default targets) or empty (=> no targets).
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
Those functions return -errno in case of an error.
The old code would typically only detect EPERM (1) errors.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
In the sregs API, upper and lower 32bit segments of the BAT registers
are swapped when doing a set. Since we need to support old kernels out
there, don't bother to fix it in the kernel, but instead work around
the problem in QEMU by swapping on put.
Signed-off-by: Alexander Graf <agraf@suse.de>
* sstabellini/xen-2012-10-03:
xen: Set the vram dirty when an error occur.
exec, memory: Call to xen_modified_memory.
exec: Introduce helper to set dirty flags.
xen: Introduce xen_modified_memory.
QMP, Introduce xen-set-global-dirty-log command.
qemu/xen: Add 64 bits big bar support on qemu
xen: Fix, no unplug of pt device by platform device.
* kwolf/for-anthony: (30 commits)
qemu-iotests: add tests for streaming error handling
qemu-iotests: map underscore to dash in QMP argument names
blkdebug: process all set_state rules in the old state
stream: add on-error argument
block: introduce block job error
iostatus: reorganize io error code
iostatus: change is_read to a bool
iostatus: move BlockdevOnError declaration to QAPI
iostatus: rename BlockErrorAction, BlockQMPEventAction
qemu-iotests: add test for pausing a streaming operation
qmp: add block-job-pause and block-job-resume
block: add support for job pause/resume
qmp: add 'busy' member to BlockJobInfo
block: add block_job_query
block: move job APIs to separate files
block: fix documentation of block_job_cancel_sync
qerror/block: introduce QERR_BLOCK_JOB_NOT_ACTIVE
qemu-iotests: add initial tests for live block commit
QAPI: add command for live block commit, 'block-commit'
block: helper function, to find the base image of a chain
...
* qmp/queue/qmp:
block: live snapshot documentation tweaks
input: index_from_key(): drop unused code
qmp: qmp_send_key(): accept key codes in hex
input: qmp_send_key(): simplify
hmp: dump-guest-memory: hardcode protocol argument to "file:"
qmp: dump-guest-memory: don't spin if non-blocking fd would block
qmp: dump-guest-memory: improve schema doc (again)
qapi: convert add_client
monitor: add Error * argument to monitor_get_fd
pci-assign: use monitor_handle_fd_param
qapi: add "unix" to the set of reserved words
qapi: do not protect enum values from namespace pollution
Add qemu-ga-client script
Support settimeout in QEMUMonitorProtocol
Make negotiation optional in QEMUMonitorProtocol
* mst/tags/for_anthony:
virtio-serial-bus: let chardev know the exact number of bytes requested
virtio: Introduce virtqueue_get_avail_bytes()
virtio: use unsigned int for counting bytes in vq
iov: add const annotation
virtio-net: fix used len for tx
virtio: don't mark unaccessed memory as dirty
* kraxel/usb.66:
usb: Fix usb_packet_map() in the presence of IOMMUs
usb-redir: Adjust pkg-config check for usbredirparser .pc file rename (v2)
ehci: Fix interrupt packet MULT handling
xhci: create a memory region for each port
xhci: route string & usb hub support
xhci: tweak limits
compat: turn off msi/msix on xhci for old machine types
add pc-1.3 machine type
Conflicts:
hw/pc_piix.c
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
The hassle and compile time overhead of maintaining both 32-bit and 64-bit
capable source isn't worth the tiny performance advantage which is seen on
a minority of configurations. Switch to compiling libhw only once, with
target_phys_addr_t unconditionally typedefed to uint64_t.
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
When booting our e500 machine, we automatically generate a big TLB entry
in TLB1 that covers all of the code we need to run in there until the guest
can handle its TLB on its own.
However, e500v2 can only handle MAS1.0 sizes. However, we keep our TLB
information in MAS2.0 layout, which means we have twice as many TLB sizes
to choose from. That also means we can run into a situation where we try
to add a TLB size that could not fit into the MAS1.0 size bits.
Fix it by making sure we always have the lower bit set to 0. That way we
are always guaranteed to have MAS1.0 compatible TLB size information.
Signed-off-by: Alexander Graf <agraf@suse.de>
The ppc specific CPU state contains several variables which track the
VPA, SLB shadow and dispatch trace log. These are structures shared
between OS and hypervisor that are used on the pseries machine to track
various per-CPU quantities.
The address of these structures needs to be registered by the guest on each
boot, however currently this registration is not cleared when we reset the
cpu. This patch corrects this bug.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
PAPR hypercalls should only be invoked from the guest kernel, not guest
user programs, that is, with MSR[PR]=0. Currently we check this in
spapr_hypercall, returning H_PRIVILEGE if MSR[PR]=1.
However, under KVM the state of MSR[PR] is already checked by the host
kernel before passing the hypercall to qemu, making this check redundant.
Worse, however, we don't generally synchronize KVM and qemu state on the
hypercall path, meaning that qemu could incorrectly reject a hypercall
because it has a stale MSR value.
This patch fixes the problem by moving the privilege test exclusively to
the TCG hypercall path.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
CC: qemu-stable@nongnu.org
Signed-off-by: Alexander Graf <agraf@suse.de>
While investigating dtb pad issues, I noticed that initrd_base wasn't taking
loadaddr into account the way dt_base was. This seems wrong.
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
An allowance of 5 MiB for BSS is not enough for Linux kernels with certain
debug options enabled (not sure exactly which one caused it, but I'd guess
lockdep). The kernel I ran into this with had a BSS of around 6.4 MB.
Unfortunately, uImage does not give us enough information to determine the
actual BSS size. Increase the allowance to 18 MiB to give us plenty of
room. Eventually this should be more intelligent, possibly packing
initrd+dtb at the end of guest RAM.
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
As per Peter's suggestion, we can use glib to write out a buffer in whole to
a file, simplifying the code dramatically.
Signed-off-by: Alexander Graf <agraf@suse.de>
CPUPPCState includes a variable 'power_mode' which is used nowhere. This
patch removes it. This includes saving a dummy zero in its place during
vmsave, to avoid breaking the save format.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
Currently the pseries machine code always attempts to set the size of the
guests's hash page table to 16MB. However, because of the way the POWER
MMU works, a suitable hash page table size should really depend on memory
size. 16MB will be excessive for guests with <1GB and RAM, and may not be
enough for guests with >2GB of RAM (depending on guest page size and
other factors).
The usual given rule of thumb is that the hash table should be 1/64 of
the size of memory, but in fact the Linux guests we are aiming at don't
really need that much. This patch, therefore, changes the hash table
allocation code to aim for 1/128 of the size of RAM (rounding up). When
using KVM, this size may still be adjusted by the host kernel if it is
unable to allocate a suitable (contiguous) table.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
In the paravirtualized environment provided by PAPR, there is a standard
locking scheme so that hypercalls updating the hash page table from
different guest threads don't corrupt the haah table state. We implement
this HVLOCK bit in out page table hypercalls. However, it is not necessary
in our case, since the hypercalls all run in the qemu environment under the
big qemu lock.
Therefore, this patch removes the locking code. This has the additional
advantage of freeing up a hash PTE bit which will be useful for migration
support.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
Report from smatch:
ppc405_uc.c:209 dcr_read_pob(12) error: buffer overflow 'pob->besr' 2 <= 2
ppc405_uc.c:232 dcr_write_pob(12) error: buffer overflow 'pob->besr' 2 <= 2
The old code reads and writes besr[POB0_BESR1 - POB0_BESR0] or besr[2]
which is one too much.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
The kvmppc_reset_htab() function invokes the KVM_PPC_ALLOCATE_HTAB vm ioctl
to request KVM to allocate and reset a hash page table for the guest - it
returns the size of hash table allocated, or 0 to indicate that qemu needs
to allocate the hash table itself. In practice qemu needs to allocate the
htab for full emulation and with Book3sPR KVM, but the kernel has to
allocate it for Book3sHV KVM (the hash table needs to be physically
contiguous in that case).
Unfortunately, the logic in this function is incorrect for some existing
kernels. Specifically:
* at least some PR KVM versions advertise the relevant capability but
don't actually implement the ioctl(), returning ENOTTY.
* For old kernels which don't have the capability, we currently return 0.
This is correct for PV KVM, where we need to allocate the htab, but not for
HV KVM - kernels of this era always allocate a 16MB hash table per guest.
This patch corrects both of these edge cases.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
Currently the ibm,int-on and ibm,int-off RTAS functions are implemented as
no-ops. This is because when implemented as specified in PAPR they caused
Linux (which calls both int-on/off and set-xive) to end up with interrupts
masked when they should not be. Since Linux's set-xive calls make the
int-on/off calls redundant, making them nops worked around the problem.
In fact, the problem was caused because there was a subtle bug in set-xive,
PAPR specifies that as well as updating the current priority, it also needs
to update the saved priority used by int-on/off. With this bug fixed the
problem goes away. This patch implements this more correct fix.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
On the pseries machine the IOMMU (aka TCE tables) is always active for all
PCI and VIO devices. Mostly to simplify the SLOF firmware, we implement an
extension which allows the IOMMU to be temporarily disabled for certain
devices.
Currently this is implemented by setting the device's DMAContext pointer to
NULL (thus reverting to qemu's default no-IOMMU DMA behaviour), then
replacing it when bypass mode is disabled.
This approach causes a bunch of complications though. It complexifies the
management of the DMAContext lifetimes, it's problematic for savevm/loadvm,
and it means that while bypass is active we have nowhere to store the
device's LIOBN (Logical IO Bus Number, used to identify DMA address
spaces). At present we regenerate the LIOBN from other address information
but this restricts how we can allocate LIOBNs.
This patch gives up on this approach, replacing it with the much simpler
one of having a 'bypass' boolean flag in the TCE state structure.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
The general device state structure for PAPR VIO emulated devices includes a
'flags' field which was never used. This patch removes it.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
Currently the XICS interrupt controller emulation uses a custom enum to
specify whether a given interrupt is level-sensitive or message-triggered.
This enum makes life awkward for saving the state, and isn't particularly
useful since there are only two possibilities. This patch replaces the
enum with a simple bool.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
The XICS interrupt controller emulation uses some C bitfield variables in
its internal state structure. This makes like awkward for saving the state
because we don't have easy VMSTATE helpers for bitfields.
This patch removes the bitfields, instead using explicit bit masking in a
single status variable.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
The H_CEDE hypercall implementation for the pseries machine doesn't trigger
quite the right path in the main cpu exec loop. We should set exit_request
to pop up one extra level and recheck state, and we should set the
exception_index to EXCP_HLT (H_CEDE is roughly equivalent to the hlt
instruction on x86).
In practice, this doesn't really matter except for KVM, and KVM implements
H_CEDE internally so we never hit this code path. But we might as well
get it right, just in case it matters some day.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
The XICS interrupt controller used on the pseries machine currently has no
reset handler. We can get away with this under some circumstances, but
it's not correct, and can cause failures if the XICS happens to be in the
wrong state at the time of reset.
This patch adds a hook to properly reset the XICS state.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
The emulated PCI host bridge on the pseries machine incorporates an IOMMU
(PAPR TCE table). Currently the mappings in this IOMMU are not cleared
when we reset the system. This patch fixes this bug. To do this it adds
a new reset function to the IOMMU emulation code. The VIO devices already
reset their TCE tables, but they do so by destroying and re-creating their
DMA context. This doesn't work for the PCI host bridge, because the
infrastructure for PCI IOMMUs has already copied/cached the DMA pointer
context into the subordinate PCI device structures.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
When we reset the system, the reset method for VIO bus devices resets
the state of their request queue (if present) as it should. However
it was not resetting the state of their TCE table (DMA translation) if
present. It was also not resetting the state of the per-device signal
mask set with H_VIO_SIGNAL. This patch corrects both bugs, and also
removes some small code duplication in the reset paths.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
This adds support for then new "reset htab" ioctl which allows qemu
to properly cleanup the MMU hash table when the guest is reset. With
the corresponding kernel support, reset of a guest now works properly.
This also paves the way for indicating a different size hash table
to the kernel and for the kernel to be able to impose limits on
the requested size.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
A number of things need to occur during reset of the PAPR
paravirtualized platform in a specific order. For example, the hash
table needs to be cleared before the CPUs are reset, so that they
initialize their register state correctly, and the CPUs need to have
their main reset called before we set up the entry point state on the
boot cpu. We also need to have the main qdev reset happen before the
creation and installation of the device tree for the new boot, because
we need the state of the devices settled to correctly construct the
device tree.
We currently do the pseries once-per-reset initializations done from a
reset handler. However we can't adequately control when this handler
is called during the reset - in particular we can't guarantee it
happens after all the qdev resets (since qdevs might be registered
after the machine init function has executed).
This patch uses the new QEMUMachine reset method to to fix this
problem, ensuring the various order dependent reset steps happen in
the correct order.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
