The code is similar to the implementation of discard and write_zeroes
with UNMAP. However, failure must be propagated up to block.c.
The stale page cache problem can be reproduced as follows:
# modprobe scsi-debug lbpws=1 lbprz=1
# ./qemu-io /dev/sdXX
qemu-io> write -P 0xcc 0 2M
qemu-io> write -z 0 1M
qemu-io> read -P 0x00 0 512
Pattern verification failed at offset 0, 512 bytes
qemu-io> read -v 0 512
00000000: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc ................
...
# ./qemu-io --cache=none /dev/sdXX
qemu-io> write -P 0xcc 0 2M
qemu-io> write -z 0 1M
qemu-io> read -P 0x00 0 512
qemu-io> read -v 0 512
00000000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
...
And similarly with discard instead of "write -z".
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
See the next commit for the description of the Linux kernel problem
that is worked around in raw_open_common.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Writing zeroes to a file can be done by punching a hole if
MAY_UNMAP is set.
Note that in this case ENOTSUP is not ignored, but makes
the block layer fall back to the generic implementation.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
The current check is right for MAY_UNMAP=1. For MAY_UNMAP=0, just
try and fall back to regular writes as soon as a WRITE SAME command
fails.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
added myself to reflect recent work on the iscsi block driver.
Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
since commit 3ac21627 the default value changed to 0.
Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This will let misaligned but large requests use zero clusters. This
is important because the cluster size is not guest visible.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Right now, bdrv_co_do_write_zeroes will only try to align the
beginning of the request. However, it is simpler for many
formats to expect the block layer to separate both the head *and*
the tail. This makes sure that the format's bdrv_co_write_zeroes
function will be called with aligned sector_num and nb_sectors for
the bulk of the request.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Similar to write_zeroes, let the generic code receive a ENOTSUP for
discard operations. Since bdrv_discard has advisory semantics,
we can just swallow the error.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This will be used by the SCSI layer.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This lets bdrv_co_do_rw receive flags, so that it can be used for
zero writes.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
bdrv_co_discard is only covering drivers which have a .bdrv_co_discard()
implementation, but not those with .bdrv_aio_discard(). Not very nice,
and easy to avoid.
Suggested-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
The buffer for description file was 4096 which only covers a few
hundred of extents. This changes the buffer to dynamic allocated with
g_strdup_printf in order to support bigger cases.
Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Prevent a call to put_kbd if null.
On shutdown of some OSes, the keyboard handler goes away before the
system is down. If a key is typed during this window, qemu crashes.
Signed-off-by: Don Koch <dkoch@verizon.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Warning from ccc-analyzer:
libcacard/vcard_emul_nss.c:937:9: warning:
Value stored to 'cert_count' is never read
cert_count = options->vreader[i].cert_count;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Warning from ccc-analyzer:
libcacard/cac.c:192:13: warning: Value stored to 'ret' is never read
ret = VCARD_DONE;
^ ~~~~~~~~~~
Here 'ret' is assigned a value inside of a switch statement and also after
that switch statement.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Most code already used QEMUTimer without the redundant 'struct' keyword.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
gcc 4.8.2 reports this warning when extra warnings are enabled (-Wextra):
CC qobject/qerror.o
qobject/qerror.c: In function ‘qerror_from_info’:
qobject/qerror.c:53:5: error:
function might be possible candidate for ‘gnu_printf’ format attribute [-Werror=suggest-attribute=format]
qerr->err_msg = g_strdup_vprintf(fmt, *va);
^
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
gcc 4.8.2 reports this warning when extra warnings are enabled (-Wextra):
CC m68k-softmmu/hw/m68k/mcf5206.o
hw/i386/acpi-build.c: In function ‘build_append_nameseg’:
hw/i386/acpi-build.c:294:5: error:
function might be possible candidate for ‘gnu_printf’ format attribute [-Werror=suggest-attribute=format]
g_string_vprintf(s, format, args);
^
When this warning is fixed, there is a new compiler warning:
CC i386-softmmu/hw/i386/acpi-build.o
hw/i386/acpi-build.c: In function ‘build_append_notify’:
hw/i386/acpi-build.c:632:5: error:
format not a string literal and no format arguments [-Werror=format-security]
build_append_nameseg(method, name);
^
This is fixed here, too.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This reduces the dependencies on trace.h.
Only one source file which needs hcd-ehci.h also needs trace.h.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This reduces the dependencies on trace.h.
Only two source files which need console.h also need trace.h.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
The AioContext ctx field is apparently unused in qemu codebase since
02ffb50448.
Signed-off-by: Marc-André Lureau <marcandre.lureau@gmail.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
qemu_co_queue_wait_insert_head() is unused in qemu code base now.
Signed-off-by: Marc-André Lureau <marcandre.lureau@gmail.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This patch adds firmware to the machine options. -bios <file> becomes a
shortcut for -machine firmware=<file>. Advantage is that the firmware
can be specified via config file as -machine is parsed using QemuOpts
and it is also possible to use different defaults for different
machine types (via QEMUMachine->default_machine_opts).
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
The intention of the Xen PV device is that it is used as a parent
device for PV drivers in Xen HVM guests and the set of PV drivers that
bind to the device is determined by its device ID (and possibly
vendor ID and revision). As such, the device should not have a default
device ID, it should always be supplied by the Xen toolstack.
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
This patch fixes:
1. build error in xen_pt.c when XEN_PT_LOGGING_ENABLED is defined
2. debug output format string error when DEBUG_XEN is defined
In the second case I also have the output info in consistent with the
output in mapping function - that is, print start_addr instead of
phys_offset.
Signed-off-by: Sander Eikelenboom <linux@eikelenboom.it>
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
With this we no longer pass down envp, and thus all systems can have
the same void prototype. So also eliminate a useless thunk.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
No need to set up a SIGILL signal handler for detection anymore.
Remove a ton of sanity checks that must be true, given that we're
requiring a 64-bit build (the note about 31-bit KVM is satisfied
by configuring with TCI).
Signed-off-by: Richard Henderson <rth@twiddle.net>
Allow host detection on linux systems without glibc 2.16 or later.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Allow host detection on linux systems without glibc 2.16 or later.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This removes "qemu-io> " prompt from qemu-io output in _filter_qemu_io,
and updates all the output files with the following command:
cd tests/qemu-iotests && sed -i "s/qemu-io> //g" *.out
Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
If you open an image temporarily just because you want to check its size
or get it flushed, there's no real reason to open the whole backing file
chain.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Benoit Canet <benoit@irqsave.net>
In the case of snapshot=on, don't rely on the backing file path in the
temporary image any more, but override the backing file with the given
set of options. This way, block drivers that don't use a file name can
be accessed with snapshot=on, for example:
-drive file.driver=nbd,file.host=localhost,snapshot=on
Which becomes internally something like:
file.filename=/tmp/vl.AWQZCu,backing.file.driver=nbd,backing.file.host=localhost
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
