Reads and writes to the underlying file can also occur with the simple
non-vectored I/O interfaces.
Acked-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
vdi.c really works as if it implemented bdrv_read and bdrv_write. However,
because only vector I/O is supported by the asynchronous callbacks, it
went through extra pain to bounce-buffer the I/O. This can be handled
by the block layer now that the format is coroutine-based.
Acked-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Most of the AIOCB really holds local variables that need to persist
across callback invocation. It can go away now.
Acked-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Now inline the former AIO callbacks into vdi_co_readv and vdi_co_writev.
While many cleanups are possible, the code now really looks synchronous.
Acked-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
The next step is to take code that only triggers after the first operation,
and move it at the end of vdi_aio_read_cb and vdi_aio_write_cb.
Acked-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Even a basic conversion changing the bdrv_aio_readv/bdrv_aio_writev calls
to bdrv_co_readv/bdrv_co_writev, and callbacks to goto statements can
eliminate a lot of code. This is because error handling is simplified
and indirections through bottom halves can go away.
After this patch, I/O to the underlying file already happens via
coroutines, but the code still looks a lot like if asynchronous I/O was
being used.
Acked-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Nicolae Mogoreanu <mogo@google.com> noticed that I/O requests can lead
to QEMU crashes when the logical_block_size property is smaller than 512
bytes.
Using the new "blocksize" property we can properly enforce constraints
on the block size such that QEMU's block layer is able to operate
correctly.
Reported-by: Nicolae Mogoreanu <mogo@google.com>
Reported-by: Michael Halcrow <mhalcrow@google.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Storage interfaces like virtio-blk can be configured with block size
information so that the guest can take advantage of efficient I/O
request sizes.
According to the SCSI Block Commands (SBC) standard a device's block
size is "almost always greater than one byte and may be a multiple of
512 bytes". QEMU currently has a 512 byte minimum block size because
the block layer functions work at that granularity. Furthermore, the
block size should be a power of 2 because QEMU calculates bitmasks from
the value.
Introduce a "blocksize" property type so devices can enforce these
constraints on block size values. If the constraints are relaxed in the
future then this property can be updated.
Introduce the new PropertyValueNotPowerOf2 QError so QMP clients know
exactly why a block size value was rejected.
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Fix a typo in the description for QERR_PROPERTY_VALUE_OUT_OF_RANGE where
"'" was used instead of ")".
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
After validation check, the 'checksum' is not written back
to footer, which leave it with zero.
This results in errors while loadding it under Microsoft's
Hyper-V environment, and also errors from utilities like
Citrix's vhd-util.
Signed-off-by: Zhang Shengju <sean_zhang@trendmicro.com.cn>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Allow the user to specify a disk's World Wide Name.
Linux guests can address disks by their unique World Wide Name number
(e.g. /dev/disk/by-id/wwn-0x5001517959123522). This patch adds support
for assigning a World Wide Name number to a virtual IDE disk.
Cc: kwolf@redhat.com
Signed-off-by: Floris Bos <dev@noc-ps.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
strncpy may not null-terminate the destination string.
Cc: kwolf@redhat.com
Signed-off-by: Floris Bos <dev@noc-ps.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Allow the user to override the default disk model name "QEMU HARDDISK".
Some Linux distributions use the /dev/disk/by-id/scsi-SATA_name-of-disk-
model_serial addressing scheme when refering to partitions in /etc/fstab
and elsewhere. This causes problems when starting a disk image taken from
an existing physical server under qemu, because when running under qemu
name-of-disk-model is always "QEMU HARDDISK".
This patch introduces a model=s option which in combination with the
existing serial=s option can be used to fake the disk the operating
system was previously on, allowing the OS to boot properly.
Cc: kwolf@redhat.com
Signed-off-by: Floris Bos <dev@noc-ps.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
And remove several block_int.h inclusions that should not be there.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
It can be useful to enable QEMU tracing when trying out block layer
interfaces via qemu-io. Tracing can be enabled using the new -T FILE
option where the given file contains a list of trace events to enable
(just like the qemu --trace events=FILE option).
$ echo qemu_vfree >my-events
$ ./qemu-io -T my-events ...
Remember to use ./configure --enable-trace-backend=BACKEND when building
qemu-io.
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Since everything goes through the cache, callers don't use the L2 table
offset any more.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
It has happened more than once that patches that look perfectly sane
and work with simpletrace broke systemtap because they use 'next' as an
argument name for a tracing function. However, 'next' is a keyword for
systemtap, so we shouldn't use it.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This patch resolves a bug in memory listener registration.
"range_add" callback was called on each section of the both
address space (IO and memory space) even if it doesn't match
the address space filter.
Signed-off-by: Julien Grall <julien.grall@citrix.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
* 's390-for-upstream' of git://repo.or.cz/qemu/agraf:
target-s390x: Update s390x_{tod,cpu}_timer() to use S390CPU
target-s390x: QOM'ify CPU init
target-s390x: QOM'ify CPU reset
target-s390x: QOM'ify CPU
The vector interrupt has higher priority than interrupt_level_n.
Also check only interrupt_level_n concurency when TL > 0, the traps of
other types may be nested.
Signed-off-by: Artyom Tarasenko <atar4qemu@gmail.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
Don't produce stray irq 5, don't overwrite ivec_data if still busy with
processing of the previous interrupt.
Signed-off-by: Artyom Tarasenko <atar4qemu@gmail.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
In place of CPUS390XState pass S390CPU as opaque from the new initfn.
cpu_interrupt() is anticipated to take a CPUState in the future.
Signed-off-by: Andreas Färber <afaerber@suse.de>
Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Move code from cpu_s390x_init() into an initfn.
Signed-off-by: Andreas Färber <afaerber@suse.de>
Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Move code from cpu_state_reset() to s390_cpu_reset().
Signed-off-by: Andreas Färber <afaerber@suse.de>
Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Embed CPUS390XState as first member of S390CPU.
Since -cpu is being ignored, make TYPE_S390_CPU non-abstract.
Signed-off-by: Andreas Färber <afaerber@suse.de>
Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Make clean does not clean the 'qom' directory, leaving *.o and *.d files. This
patch fixes this.
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
This library is needed when using 'ust/tracepoint.h'.
Signed-off-by: Harsh Prateek Bora <harsh@linux.vnet.ibm.com>
Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
The function usleep is not available for all supported platforms:
at least some versions of MinGW don't support it.
usleep was also declared obsolete by POSIX.1-2001.
The function g_usleep is part of glib2.0, so it is available for
all supported platforms.
Using nanosleep would also be possible but needs more code.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
gcc reports an error when the code is compiled with -Wmissing-format-attribute.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
It's typical to prepend or append parameters to an argument string so
that other places in ./configure can add parameters without clobbering
the string. In the mingw32 libs_qga case there is a typo "$lib_qga"
instead of "$libs_qga".
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Reviewed-by: Andreas Färber <afaerber@suse.de>
A strong limitation of QOM right now is that unconverted ports
(e.g. all...) do not give a canonical path to devices that are
part of the board. This in turn makes it impossible to replace
PROP_PTR with a QOM link for example.
Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
We want the composition tree to to be in order by the time we call
qdev_init, so that a single set of the toplevel realize property can
propagate all the way down the composition tree.
This is not the case so far. Unfortunately, this is incompatible
with calling qdev_init in the constructor wrappers for devices,
so for now we need to unattach some devices that are created through
those wrappers. This will be fixed by removing qdev_init and instead
setting the toplevel realize property after machine init.
Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This is QOM "mkdir -p". It is useful when referring to
container objects such as "/machine".
Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
* kiszka/queues/slirp:
slirp: Signal free input buffer space to io-thread
w32/slirp: Undefine error constants before their redefinition
slirp: use socket_set_nonblock
slirp: clean up conflicts with system headers
* stefanha/tracing:
tracetool: dtrace: handle in and next reserved words
tracetool: dtrace disabled-events fix
Makefile.target: code stp dependency on trace-events
We never actually clear the TEMT (transmit sending register empty) flag when
populating the TSR. We set the flag, but since it's never cleared, setting it
is sort of pointless..
I found this with a unit test case.
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
I'm not sure if the retry logic has ever worked when not using FIFO mode. I
found this while writing a test case although code inspection confirms it is
definitely broken.
The TSR retry logic will never actually happen because it is guarded by an
'if (s->tsr_rety > 0)' but this is the only place that can ever make the
variable greater than zero. That effectively makes the retry logic an 'if (0)'.
I believe this is a typo and the intention was >= 0. Once this is fixed though,
I see double transmits with my test case. This is because in the non FIFO
case, serial_xmit may get invoked while LSR.THRE is still high because the
character was processed but the retransmit timer was still active.
We can handle this by simply checking for LSR.THRE and returning early. It's
possible that the FIFO paths also need some attention.
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
On linux, qemu_timeval will always be two long ints. On windows, we use our
own struct definition. This should fix win64.
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This bug existed since the first commit. Fortunately, the affected
registers have no functionality in qemu. This will only prevent the
following warning:
milkymist_vgafb: write access to unknown register 0x00000034
Signed-off-by: Michael Walle <michael@walle.cc>
The new version introduces the following new registers:
- SoC clock frequency: read-only of system clock used on the SoC
- debug scratchpad: 8 bit scratchpad register
- debug write lock: write once register, without any function on QEMU
Signed-off-by: Michael Walle <michael@walle.cc>
