This change fixes a long-standing immediate crash (memory corruption
and abort in glibc malloc code) in migration on 32bits.

The bug is present since this commit:

  commit 692d9aca97b865b0f7903565274a52606910f129
  Author: Bruce Rogers <brogers@novell.com>
  Date:   Wed Sep 23 16:13:18 2009 -0600

    qemu-kvm: allocate correct size for dirty bitmap

    The dirty bitmap copied out to userspace is stored in a long array,
    and gets copied out to userspace accordingly.  This patch accounts
    for that correctly.  Currently I'm seeing kvm crashing due to writing
    beyond the end of the alloc'd dirty bitmap memory, because the buffer
    has the wrong size.

    Signed-off-by: Bruce Rogers
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>

 --- a/qemu-kvm.c
 +++ b/qemu-kvm.c
 @@ int kvm_get_dirty_pages_range(kvm_context_t kvm, unsigned long phys_addr,
 -            buf = qemu_malloc((slots[i].len / 4096 + 7) / 8 + 2);
 +            buf = qemu_malloc(BITMAP_SIZE(slots[i].len));
             r = kvm_get_map(kvm, KVM_GET_DIRTY_LOG, i, buf);

BITMAP_SIZE is now open-coded in that function, like this:

 size = ALIGN(((mem->memory_size) >> TARGET_PAGE_BITS), HOST_LONG_BITS) / 8;

The problem is that HOST_LONG_BITS in 32bit userspace is 32
but it's 64 in 64bit kernel.  So userspace aligns this to
32, and kernel to 64, but since no length is passed from
userspace to kernel on ioctl, kernel uses its size calculation
and copies 4 extra bytes to userspace, corrupting memory.

Here's how it looks like during migrate execution:

our=20, kern=24
our=4, kern=8
...
our=4, kern=8
our=4064, kern=4064
our=512, kern=512
our=4, kern=8
our=20, kern=24
our=4, kern=8
...
our=4, kern=8
our=4064, kern=4064
*** glibc detected *** ./x86_64-softmmu/qemu-system-x86_64: realloc(): invalid next size: 0x08f20528 ***

(our is userspace size above, kern is the size as calculated
by the kernel).

Fix this by always aligning to 64 in a hope that no platform will
have sizeof(long)>8 any time soon, and add a comment describing it
all.  It's a small price to pay for bad kernel design.

Alternatively it's possible to fix that in the kernel by using
different size calculation depending on the current process.
But this becomes quite ugly.

Special thanks goes to Stefan Hajnoczi for spotting the fundamental
cause of the issue, and to Alexander Graf for his support in #qemu.
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>
CC: Bruce Rogers <brogers@novell.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

KVM only requires to set the raised IRQ in CPUState and to kick the
receiving vcpu if it is remote. Installing a specialized handler allows
potential future changes to the TCG code path without risking KVM side
effects.
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>

This allows to override the interrupt handling of QEMU in system mode.
KVM will make use of it to set a specialized handler.
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>

Both have only two lines in common, and we will convert the system
service into a callback which is of no use for user mode operation.
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
CC: Riku Voipio <riku.voipio@iki.fi>
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>

kvmclock presence can be signalled by two different flags. So for
device creation, we have to test for both.
Signed-off-by: NGlauber Costa <glommer@redhat.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

We have two bits that can represent kvmclock in cpuid.
They signal the guest which msr set to use. When we tweak flags
involving this value - specially when we use "-", we have to act on both.
Signed-off-by: NGlauber Costa <glommer@redhat.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

kvmclock is represented by two feature bits. Therefore, lookup_feature
needs to continue its search even after the first match. Enhance it
accordingly and switch to a bool return type at this chance.
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>

Use the features provided by KVM_GET_SUPPORTED_CPUID directly to
mask out features from guest-visible cpuid.

The old get_para_features() mechanism is kept for older kernels that do not implement it.
Signed-off-by: NGlauber Costa <glommer@redhat.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

The kernel doesn't fill the buffer provided to sched_getaffinity
with zero bytes, so neither should QEMU.
Signed-off-by: NMike McCormack <mj.mccormack@samsung.com>
Reviewed-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: NRiku Voipio <riku.voipio@iki.fi>

Zeroing of the cpu array should start from &cpus[kernel_ret]
not &cpus[num_zeros_to_fill].

This fixes a crash in EFL's edje_cc running under qemu-arm.
Signed-off-by: NMike McCormack <mj.mccormack@samsung.com>
Reviewed-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Acked-by: NMike Frysinger <vapier@gentoo.org>
Signed-off-by: NRiku Voipio <riku.voipio@iki.fi>

Debian Lenny and other installations with older linux versions
failed to compile linux-user because some CLONE_xxx macros are
undefined.
Signed-off-by: NStefan Weil <weil@mail.berlios.de>
Signed-off-by: NRiku Voipio <riku.voipio@iki.fi>

* 'patches' of git://qemu.weilnetz.de/git/qemu:
  qemu-timer: Fix timers for w32
  qemu-timer: Avoid type casts
  qemu-timer: Remove unneeded include statement (w32)
  qemu-timer: Add and use new function qemu_timer_expired_ns

The latest virtfs pull broke the cris-softmmu target.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

The virtio serial specification requres that the values in the config
space are encoded in native endian of the guest.

The qemu virtio-serial code did not do conversion to the guest endian
format what caused problems when host and guest use different format.

This patch corrects the qemu side, correctly doing host-native <->
guest-native conversions when accessing the config space. This won't
break any setups that aren't already broken, and fixes the case
of different host and guest endianness.
Signed-off-by: NAlexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
Reviewed-by: NJuan Quintela <quintela@redhat.com>
Signed-off-by: NAmit Shah <amit.shah@redhat.com>

Juan says he prefers these extra checks to ensure a user of a chardev is
releasing it.
Requested-by: NJuan Quintela <quintela@redhat.com>
Signed-off-by: NAmit Shah <amit.shah@redhat.com>

This fixes regression caused by commit
2d6c1ef4
("char: Prevent multiple devices opening same chardev"):

-nodefaults -nographic -chardev stdio,id=stdio,mux=on,signal=off \
 -mon stdio -device virtio-serial-pci \
 -device virtconsole,chardev=stdio -device isa-serial,chardev=stdio

fails with:

qemu-system-x86_64: -device isa-serial,chardev=stdio: Property 'isa-serial.chardev' can't take value 'stdio', it's in use
Signed-off-by: NKusanagi Kouichi <slash@ac.auone-net.jp>
Signed-off-by: NAmit Shah <amit.shah@redhat.com>

Note the vmc_register_interface() in spice_chr_write is left in place
in case someone uses spice-chardev with a frontend which does not have
guest open / close notification.
Signed-off-by: NHans de Goede <hdegoede@redhat.com>
Reviewed-by: NAlon Levy <alevy@redhat.com>
Signed-off-by: NAmit Shah <amit.shah@redhat.com>

Signed-off-by: NHans de Goede <hdegoede@redhat.com>
Reviewed-by: NAlon Levy <alevy@redhat.com>
Signed-off-by: NAmit Shah <amit.shah@redhat.com>

Some frontends know when the guest has opened the "channel" and is actively
listening to it, for example virtio-serial. This patch adds 2 new qemu-chardev
functions which can be used by frontends to signal guest open / close, and
allows interested backends to listen to this.
Signed-off-by: NHans de Goede <hdegoede@redhat.com>
Reviewed-by: NAlon Levy <alevy@redhat.com>
Signed-off-by: NAmit Shah <amit.shah@redhat.com>

Make sure the base register isn't updated if it is in the load list
for a Thumb LDM (T1 encoding) which aborts partway through the load.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

target-arm: fix LDMIA bug on page boundary

When consecutive memory locations are on page boundary, a base register may be
loaded before page fault occurs. After page fault handling, it losts the memory
location information. To solve this problem, loading a base register has to put back.
Signed-off-by: NYuyeon Oh <yuyeon.oh@samsung.com>
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

So far we set IRR for edge IRQs even if the pin is masked. If the guest
later on unmasks and switches the pin to level-triggered mode, irr will
remain set, causing an IRQ storm. The point is that setting IRR is not
correct in this case according to the spec, and avoiding this resolves
the issue.
Reported-and-tested-by: NIsaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

The -virtfs option creates an fsdev representing the pass-through file
system and a guest-visible virtio-9p-pci device that can access this
file system.  This patch replaces the string manipulation used to build
and reparse option lists with direct QemuOpts calls.  Removing the
string manipulation code makes it easier to maintain and less error
prone.

An error message is also updated to use "mount_tag" instead of
"mnt_tag".
Signed-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: NVenkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>

The nwnames field in TWALK message is assumed to be >=0 and <= MAXWELEM
which is defined as macro P9_MAXWELEM (16) in virtio-9p.h as per 9p2000
RFC. Appropriate changes are required in V9fsWalkState and v9fs_walk.
Signed-off-by: NHarsh Prateek Bora <harsh@linux.vnet.ibm.com>
Reviewed-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: NVenkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>

This patch removes the addition of null char in symlink file
which is being appended to file in case of mapped security model.
Without this patch, the extra null char causes LTP testcase lstat03
to fail and hence this fix is required.
Signed-off-by: NVenkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>

LCREATE function packs address of iounit in the pdu, fix that to send
actual iounit itself.
Signed-off-by: NM. Mohan Kumar <mohan@in.ibm.com>
Acked-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: NVenkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>

If we don't have default acl, removexattr on default acl
should return 0
Signed-off-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: NVenkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>

Signed-off-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: NVenkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>

Now that we start adding more files related to 9pfs
it make sense to move them to a separate directory
Signed-off-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: NVenkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>

Commit 5145b3d1 revealed a bug in the lazy ROMD switch-back logic, but
resolved it by breaking that feature. This approach addresses the issue
by switching back to ROMD after a certain amount of read accesses
without further unlock sequences.
Signed-off-by: NJan Kiszka <jan.kiszka@web.de>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

cppcheck reports this error:

commpage.c:223: error: Possible null pointer dereference:
value - otherwise it is redundant to check if value is null at line 214

The null pointer check in line 214 is indeed not needed.
If value were null, the code would crash in line 223.
See do_compare_and_swap64 were for a reference.
Signed-off-by: NStefan Weil <weil@mail.berlios.de>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

* 'for-anthony' of git://repo.or.cz/qemu/kevin:
  Remove obsolete 'enabled' variable from progress state
  Add dd-style SIGUSR1 progress reporting
  qed: Fix consistency check on 32-bit hosts
  ide/atapi: Introduce CHECK_READY flag for commands
  ide/atapi: Replace bdrv_get_geometry calls by s->nb_sectors
  ide/atapi: Use table instead of switch for commands
  ide/atapi: Factor commands out
  ide: Split atapi.c out
  Improve accuracy of block migration bandwidth calculation
  atapi: Add 'medium ready' to 'medium not ready' transition on cd change
  qemu-img: allow rebase to a NULL backing file when unsafe

Compilation for Windows needs a different declaration for the
printf format attribute, so use the macro which was defined for
this purpose.

Cc: Benjamin Poirier <benjamin.poirier@gmail.com>
Signed-off-by: NStefan Weil <weil@mail.berlios.de>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

Signed-off-by: NJes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

This introduces support for dd-style progress reporting on POSIX
systems, if the user hasn't specified -p to report progress. If sent a
SIGUSR1, qemu-img will report current progress for commands that
support progress reporting.
Signed-off-by: NJes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

The qed_bytes_to_clusters() function is normally used with size_t
lengths.  Consistency check used it with file size length and therefore
failed on 32-bit hosts when the image file is 4 GB or more.

Make qed_bytes_to_clusters() explicitly 64-bit and update consistency
check to keep 64-bit cluster counts.
Reported-by: NMichael Tokarev <mjt@tls.msk.ru>
Signed-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

Some commands are supposed to report a Not Ready Condition (i.e. they require
a medium to be present in order to execute successfully). Instead of
duplicating the check in each command implementation, let's add a flag and
check it before calling the command.

This patch only converts existing checks, it does not introduce new checks for
any of the other commands that can/should report a Not Ready Condition.
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

The disk size can only change when the medium is changed, and the change
callback takes care of updating s->nb_sectors in this case.
Signed-off-by: NKevin Wolf <kwolf@redhat.com>