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2012-08-09xilinx_axienet: avoid useless self-assignmentBlue Swirl
Statement s=s; makes little sense, remove it. Spotted by Clang compiler. Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2012-08-09user: fix accidental AREG0 useBlue Swirl
Global register AREG0 was always assumed to be usable in user-exec.c, but this is incorrect for several targets. Fix with #ifdeffery and by using other variables. Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2012-08-09qapi: avoid reserved keywordsBlue Swirl
Clang compiler complained about use of reserved word 'restrict' in SLIRP and QAPI. Prefix C keywords with "q_", adjust SLIRP accordingly. Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2012-08-09sparc: fix expression with uninitialized initial valueBlue Swirl
err was uninitialized, it's not OK to use |=. Spotted by Clang compiler. Fix by implementing the earlier statement which initializes the variable. Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2012-08-09sparc: fix floppy TC line setupBlue Swirl
The qemu_irq for Terminal Count (TC) line between FDC and Slavio misc device was created only after use, spotted by Clang compiler. Also, it was not created if the FDC didn't exist. Rearrange code to fix order. Always create the TC line. Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2012-08-09esp: add Tekram DC-390 emulation (PC SCSI adapter)Hervé Poussineau
Difference with AMD PCscsi is that DC-390 contains a EEPROM, and that a romfile is available to add INT13 support. This has been successfully tested on: - MS DOS 6.22 (using DC390 ASPI driver) - MS Windows 98 SE (using DC390 driver) - MS Windows NT 3.1 (using DC390 driver) - MS Windows NT 4.0 (using DC390 driver) - hard disk and cdrom boot Signed-off-by: Hervé Poussineau <hpoussin@reactos.org> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2012-08-09Revert "pci: add some stubs"Hervé Poussineau
This reverts commit 0883c5159f1df05d8761014f65451c3c3b77ebcf. Those stubs were only used by PCI ESP emulation, which is now not compiled on architectures which have no PCI bus support. Signed-off-by: Hervé Poussineau <hpoussin@reactos.org> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2012-08-09esp: move PCI emulation to a new file esp-pci.cHervé Poussineau
sparc machines loose ability to instanciate PCI ESP SCSI adapter, which is not a big loose as they don't have PCI bus support. Signed-off-by: Hervé Poussineau <hpoussin@reactos.org> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2012-08-09esp: move some definitions to header fileHervé Poussineau
These will be used by next commits. Signed-off-by: Hervé Poussineau <hpoussin@reactos.org> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2012-08-07Merge remote-tracking branch 'kraxel/usb.58' into stagingAnthony Liguori
* kraxel/usb.58: usb-storage: fix SYNCHRONIZE_CACHE usb-storage: improve debug logging
2012-08-07Merge remote-tracking branch 'kwolf/for-anthony' into stagingAnthony Liguori
* kwolf/for-anthony: qemu-img: use QemuOpts instead of QEMUOptionParameter in resize function qemu-iotests: Be more flexible with image creation options qemu-iotests: add 039 qcow2 lazy refcounts test qemu-io: add "abort" command to simulate program crash qcow2: implement lazy refcounts qemu-iotests: ignore qemu-img create lazy_refcounts output docs: add lazy refcounts bit to qcow2 specification qcow2: introduce dirty bit docs: add dirty bit to qcow2 specification qemu-iotests: add qed.py image manipulation utility qapi: generalize documentation of streaming commands ide scsi: Mess with geometry only for hard disk devices
2012-08-07usb-storage: fix SYNCHRONIZE_CACHEGerd Hoffmann
Commit 59310659073d85745854f2f10c4292555c5a1c51 is incomplete, we'll arrive in the scsi command complete callback in CSW state and must handle that case correctly. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2012-08-07usb-storage: improve debug loggingGerd Hoffmann
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2012-08-06slirp: fix build on mingw32Anthony Liguori
in_addr_t isn't available on mingw32. Just use an unsigned long instead. I considered typedef'ing in_addr_t on mingw32 but this would potentially be brittle if mingw32 did introduce the type. Cc: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-08-06qemu-img: use QemuOpts instead of QEMUOptionParameter in resize functionDong Xu Wang
Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com> Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-08-06qemu-iotests: Be more flexible with image creation optionsKevin Wolf
qemu-iotests already filters out image creation options that may be present or not in order to get the same output in both cases. However, often it only considers the default value of the option. Cover all valid values instead so that ./check -o name=value can be used successfull for all of them. Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-08-06qemu-iotests: add 039 qcow2 lazy refcounts testStefan Hajnoczi
This tests establishes the basic post-conditions of the qcow2 lazy refcounts features: 1. If the image was closed normally, it is marked clean. 2. If an allocating write was performed and the image was not closed normally, then it is marked dirty. a. Written data can be read back successfully. b. The image file can be repaired and will be marked clean again. c. The image file is automatically repaired when opened read/write. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-08-06qemu-io: add "abort" command to simulate program crashStefan Hajnoczi
Avoiding data loss and corruption is the top requirement for image file formats. The qemu-io "abort" command makes it possible to simulate program crashes and does not give the image format a chance to cleanly shut down. This command is useful for data integrity test cases. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-08-06qcow2: implement lazy refcountsStefan Hajnoczi
Lazy refcounts is a performance optimization for qcow2 that postpones refcount metadata updates and instead marks the image dirty. In the case of crash or power failure the image will be left in a dirty state and repaired next time it is opened. Reducing metadata I/O is important for cache=writethrough and cache=directsync because these modes guarantee that data is on disk after each write (hence we cannot take advantage of caching updates in RAM). Refcount metadata is not needed for guest->file block address translation and therefore does not need to be on-disk at the time of write completion - this is the motivation behind the lazy refcount optimization. The lazy refcount optimization must be enabled at image creation time: qemu-img create -f qcow2 -o compat=1.1,lazy_refcounts=on a.qcow2 10G qemu-system-x86_64 -drive if=virtio,file=a.qcow2,cache=writethrough Update qemu-iotests 031 and 036 since the extension header size changes when we add feature bit table entries. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-08-06qemu-iotests: ignore qemu-img create lazy_refcounts outputStefan Hajnoczi
Hide the default lazy_refcounts=off output from qemu-img like we do with other image creation options. This ensures that existing golden outputs continue to pass despite the new option that has been added. Note that this patch applies before the one that actually introduces the lazy_refcounts=on|off option. This ensures git-bisect(1) continues to work. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-08-06docs: add lazy refcounts bit to qcow2 specificationStefan Hajnoczi
The lazy refcounts bit indicates that this image can take advantage of the dirty bit and that refcount updates can be postponed. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-08-06qcow2: introduce dirty bitStefan Hajnoczi
This patch adds an incompatible feature bit to mark images that have not been closed cleanly. When a dirty image file is opened a consistency check and repair is performed. Update qemu-iotests 031 and 036 since the extension header size changes when we add feature bit table entries. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-08-06docs: add dirty bit to qcow2 specificationStefan Hajnoczi
The dirty bit will make it possible to perform lazy refcount updates, where the image file is not kept consistent all the time. Upon opening a dirty image file, it is necessary to perform a consistency check and repair any incorrect refcounts. Therefore the dirty bit must be an incompatible feature bit. We don't want old programs accessing a file with stale refcounts. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-08-06qemu-iotests: add qed.py image manipulation utilityStefan Hajnoczi
The qed.py utility can inspect and manipulate QED image files. It can be used for testing to see the state of image metadata and also to inject corruptions into the image file. It also has a scrubbing feature to copy just the metadata out of an image file, allowing users to share broken image files without revealing data in bug reports. This has lived in my local repo for a long time but could be useful to others. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-08-06qapi: generalize documentation of streaming commandsPaolo Bonzini
Talk about background operations in general, rather than specifically about streaming. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-08-06ide scsi: Mess with geometry only for hard disk devicesMarkus Armbruster
Legacy -drive cyls=... are now ignored completely when the drive doesn't back a hard disk device. Before, they were first checked against a hard disk's limits, then ignored. Signed-off-by: Markus Armbruster <armbru@redhat.com> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-08-06virtio: fix vhost handlingPaolo Bonzini
Commit b1f416aa8d870fab71030abc9401cfc77b948e8e breaks vhost_net because it always registers the virtio_pci_host_notifier_read() handler function on the ioeventfd, even when vhost_net.ko is using the ioeventfd. The result is both QEMU and vhost_net.ko polling on the same eventfd and the virtio_net.ko guest driver seeing inconsistent results: # ifconfig eth0 192.168.0.1 netmask 255.255.255.0 virtio_net virtio0: output:id 0 is not a head! To fix this, proceed the same as we do for irqfd: add a parameter to virtio_queue_set_host_notifier_fd_handler and in that case only set the notifier, not the handler. Cc: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Tested-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-08-06Merge remote-tracking branch 'kiszka/queues/slirp' into stagingAnthony Liguori
* kiszka/queues/slirp: slirp: Handle whole 127.0.0.0/8 network as local addresses.
2012-08-04Merge branch 'axp-next' of git://repo.or.cz/qemu/rthBlue Swirl
* 'axp-next' of git://repo.or.cz/qemu/rth: alpha-linux-user: Fix the getpriority syscall alpha-linux-user: Properly handle the non-rt sigprocmask syscall. alpha-linux-user: Fix a3 error return with v0 error bypass. linux-user: Translate pipe2 flags; add to strace linux-user: Allocate the right amount of space for non-fixed file maps linux-user: Handle O_SYNC, O_NOATIME, O_CLOEXEC, O_PATH linux-user: Sync fcntl.h bits with the kernel alpha-linux-user: Handle TARGET_SSI_IEEE_RAISE_EXCEPTION properly alpha-linux-user: Work around hosted mmap allocation problems alpha-linux-user: Fix signal handling
2012-08-04alpha-linux-user: Fix the getpriority syscallRichard Henderson
Alpha uses unbiased priority values in the syscall, with the a3 return value signaling error conditions. Therefore, properly interpret the libc getpriority as needed for the guest rather than passing the host value through unchanged. Signed-off-by: Richard Henderson <rth@twiddle.net>
2012-08-04alpha-linux-user: Properly handle the non-rt sigprocmask syscall.Richard Henderson
Name the syscall properly for QEMU, kernel source notwithstanding. Fix syntax errors in the code thus enabled within do_syscall. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <rth@twiddle.net>
2012-08-04alpha-linux-user: Fix a3 error return with v0 error bypass.Richard Henderson
We were failing to initialize a3 for syscalls that bypass the negative return value error check. Signed-off-by: Richard Henderson <rth@twiddle.net>
2012-08-04linux-user: Translate pipe2 flags; add to straceRichard Henderson
Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <rth@twiddle.net>
2012-08-04linux-user: Allocate the right amount of space for non-fixed file mapsRichard Henderson
If we let the kernel handle the implementation of mmap_find_vma, via an anon mmap, we must use the size as indicated by the user and not the size truncated to the filesize. This happens often in ld.so, where we initially mmap the file to the size of the text+data+bss to reserve an area, then mmap+fixed over the top to properly handle data and bss. Signed-off-by: Richard Henderson <rth@twiddle.net>
2012-08-04linux-user: Handle O_SYNC, O_NOATIME, O_CLOEXEC, O_PATHRichard Henderson
Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <rth@twiddle.net>
2012-08-04linux-user: Sync fcntl.h bits with the kernelRichard Henderson
For each target, only define the bits that appear in arch/target/include/asm/fcntl.h. Mirror the kernel's asm-generic layout by handling anything undefined afterward. Signed-off-by: Richard Henderson <rth@twiddle.net>
2012-08-04alpha-linux-user: Handle TARGET_SSI_IEEE_RAISE_EXCEPTION properlyRichard Henderson
We weren't aggregating the exceptions, nor raising signals properly. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <rth@twiddle.net>
2012-08-04alpha-linux-user: Work around hosted mmap allocation problemsRichard Henderson
Signed-off-by: Richard Henderson <rth@twiddle.net>
2012-08-04alpha-linux-user: Fix signal handlingRichard Henderson
Proper signal numbers were not defined, and EXCP_INTERRUPT was unhandled, leading to all sorts of subtle confusion. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <rth@twiddle.net>
2012-08-04bitops: drop volatile qualifierBlue Swirl
Qualifier 'volatile' is not useful for applications, it's too strict for single threaded code but does not give the real atomicity guarantees needed for multithreaded code. Drop them and now useless casts. Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2012-08-04configure: Fix set-but-not-used warning in Xen 4.1 probePeter Maydell
The Xen 4.1 probe never uses the return value from xc_interface_open(), so was provoking a compiler warning on newer gcc. Fix by not bothering to put the return value anywhere. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2012-08-04configure: Don't run Xen compile checks in subshellsPeter Maydell
The Xen compile checks are currently run inside subshells. This is unnecessary and has the effect that if do_cc() exits with an error message then this only causes the subshell to exit, not the whole of configure, which is confusing. Remove the subshells, changing: if ( cat ; compile_prog ) ; then ... to if cat && compile_prog ; then ... Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2012-08-04Fixes related to processing of qemu's -numa optionChegu Vinod
The -numa option to qemu is used to create [fake] numa nodes and expose them to the guest OS instance. There are a couple of issues with the -numa option: a) Max VCPU's that can be specified for a guest while using the qemu's -numa option is 64. Due to a typecasting issue when the number of VCPUs is > 32 the VCPUs don't show up under the specified [fake] numa nodes. b) KVM currently has support for 160VCPUs per guest. The qemu's -numa option has only support for upto 64VCPUs per guest. This patch addresses these two issues. Below are examples of (a) and (b) a) >32 VCPUs are specified with the -numa option: /usr/local/bin/qemu-system-x86_64 \ -enable-kvm \ 71:01:01 \ -net tap,ifname=tap0,script=no,downscript=no \ -vnc :4 ... Upstream qemu : -------------- QEMU 1.1.50 monitor - type 'help' for more information (qemu) info numa 6 nodes node 0 cpus: 0 1 2 3 4 5 6 7 8 9 32 33 34 35 36 37 38 39 40 41 node 0 size: 131072 MB node 1 cpus: 10 11 12 13 14 15 16 17 18 19 42 43 44 45 46 47 48 49 50 51 node 1 size: 131072 MB node 2 cpus: 20 21 22 23 24 25 26 27 28 29 52 53 54 55 56 57 58 59 node 2 size: 131072 MB node 3 cpus: 30 node 3 size: 131072 MB node 4 cpus: node 4 size: 131072 MB node 5 cpus: 31 node 5 size: 131072 MB With the patch applied : ----------------------- QEMU 1.1.50 monitor - type 'help' for more information (qemu) info numa 6 nodes node 0 cpus: 0 1 2 3 4 5 6 7 8 9 node 0 size: 131072 MB node 1 cpus: 10 11 12 13 14 15 16 17 18 19 node 1 size: 131072 MB node 2 cpus: 20 21 22 23 24 25 26 27 28 29 node 2 size: 131072 MB node 3 cpus: 30 31 32 33 34 35 36 37 38 39 node 3 size: 131072 MB node 4 cpus: 40 41 42 43 44 45 46 47 48 49 node 4 size: 131072 MB node 5 cpus: 50 51 52 53 54 55 56 57 58 59 node 5 size: 131072 MB b) >64 VCPUs specified with -numa option: /usr/local/bin/qemu-system-x86_64 \ -enable-kvm \ -cpu Westmere,+rdtscp,+pdpe1gb,+dca,+pdcm,+xtpr,+tm2,+est,+smx,+vmx,+ds_cpl,+monitor,+dtes64,+pclmuldq,+pbe,+tm,+ht,+ss,+acpi,+d-vnc :4 ... Upstream qemu : -------------- only 63 CPUs in NUMA mode supported. only 64 CPUs in NUMA mode supported. QEMU 1.1.50 monitor - type 'help' for more information (qemu) info numa 8 nodes node 0 cpus: 6 7 8 9 38 39 40 41 70 71 72 73 node 0 size: 65536 MB node 1 cpus: 10 11 12 13 14 15 16 17 18 19 42 43 44 45 46 47 48 49 50 51 74 75 76 77 78 79 node 1 size: 65536 MB node 2 cpus: 20 21 22 23 24 25 26 27 28 29 52 53 54 55 56 57 58 59 60 61 node 2 size: 65536 MB node 3 cpus: 30 62 node 3 size: 65536 MB node 4 cpus: node 4 size: 65536 MB node 5 cpus: node 5 size: 65536 MB node 6 cpus: 31 63 node 6 size: 65536 MB node 7 cpus: 0 1 2 3 4 5 32 33 34 35 36 37 64 65 66 67 68 69 node 7 size: 65536 MB With the patch applied : ----------------------- QEMU 1.1.50 monitor - type 'help' for more information (qemu) info numa 8 nodes node 0 cpus: 0 1 2 3 4 5 6 7 8 9 node 0 size: 65536 MB node 1 cpus: 10 11 12 13 14 15 16 17 18 19 node 1 size: 65536 MB node 2 cpus: 20 21 22 23 24 25 26 27 28 29 node 2 size: 65536 MB node 3 cpus: 30 31 32 33 34 35 36 37 38 39 node 3 size: 65536 MB node 4 cpus: 40 41 42 43 44 45 46 47 48 49 node 4 size: 65536 MB node 5 cpus: 50 51 52 53 54 55 56 57 58 59 node 5 size: 65536 MB node 6 cpus: 60 61 62 63 64 65 66 67 68 69 node 6 size: 65536 MB node 7 cpus: 70 71 72 73 74 75 76 77 78 79 Signed-off-by: Chegu Vinod <chegu_vinod@hp.com>, Jim Hull <jim.hull@hp.com>, Craig Hada <craig.hada@hp.com> Tested-by: Eduardo Habkost <ehabkost@redhat.com> Reviewed-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2012-08-04build: Fix build breakage detected by buildbotDunrong Huang
More details: http://buildbot.b1-systems.de/qemu/builders/xen_unstable/builds/83/steps/compile/logs/stdio VLANState has been removed since commit a005d07, so "vlan id" should be fetched using net_hub_id_for_client(). Signed-off-by: Dunrong Huang <riegamaths@gmail.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-08-03fips: fix build on !LinuxAnthony Liguori
Commit 0f66998 makes -enable-fips conditional on Linux hosts but then uses it unconditionally in vl.c. Fix this by moving the fips handling to os-posix.c and adding a condition. Cc: Paul Moore <pmoore@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-08-03slirp: Handle whole 127.0.0.0/8 network as local addresses.Anders Waldenborg
Changes so translation of remote address to the host's ip address in the virtual network happens for all addresses in the 127.0.0.0/8 network, not just 127.0.0.1. This fixes so that hostfwd bound to addresses such as 127.0.0.2 works. Signed-off-by: Anders Waldenborg <anders@0x63.nu> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
2012-08-03Merge remote-tracking branch 'bonzini/scsi-next' into stagingAnthony Liguori
* bonzini/scsi-next: scsi: add support for ATA_PASSTHROUGH_xx scsi command esp: add missing const on TypeInfo structures esp: enable for all PCI machines Revert "megasas: disable due to build breakage" megasas: static SAS addresses scsi-disk: fix compilation with DEBUG_SCSI megasas: Update function megasys_scsi_uninit SCSI: STARTSTOPUNIT only eject/load media if powercondition is 0 SCSI: Update the sense code for PREVENT REMOVAL errors
2012-08-03scsi: add support for ATA_PASSTHROUGH_xx scsi commandCong Meng
Correct the command names of opcode 0x85 and 0xa1, and calculate their xfer size from CDB. Signed-off-by: Cong Meng <mc@linux.vnet.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-08-03vnc: disable VNC password authentication (security type 2) when in FIPS modePaul Moore
FIPS 140-2 requires disabling certain ciphers, including DES, which is used by VNC to obscure passwords when they are sent over the network. The solution for FIPS users is to disable the use of VNC password auth when the host system is operating in FIPS compliance mode and the user has specified '-enable-fips' on the QEMU command line. This patch causes QEMU to emit a message to stderr when the host system is running in FIPS mode and a VNC password was specified on the commend line. If the system is not running in FIPS mode, or is running in FIPS mode but VNC password authentication was not requested, QEMU operates normally. Signed-off-by: Paul Moore <pmoore@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-08-03Merge remote-tracking branch 'qmp/queue/qmp' into stagingAnthony Liguori
* qmp/queue/qmp: hmp: show the backing file depth block: Use bdrv_get_backing_file_depth() block: create bdrv_get_backing_file_depth() qapi: qapi.py: allow the "'" character to be escaped
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