Paolo Bonzini [Fri, 2 Nov 2012 14:43:24 +0000 (15:43 +0100)]
vl: delay thread initialization after daemonization
Commit ac4119c (chardev: Use timer instead of bottom-half to postpone
open event, 2012-10-12) moved the alarm timer initialization to an earlier
point but failed to consider that it depends on qemu_init_main_loop.
Later, commit 1c53786 (vl: init main loop earlier, 2012-10-30) fixed
this, but left -daemonize in two different ways. First, timers need to
be reinitialized after forking. Second, the global mutex was being held
by the parent, and thus dropped after forking.
The first is now fixed using pthread_atfork. For the second part,
make sure that the global mutex is not taken before daemonization,
and similarly delay qemu_thread_self.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Anthony Liguori [Fri, 2 Nov 2012 18:06:28 +0000 (13:06 -0500)]
Merge remote-tracking branch 'bonzini/migr-coroutine' into staging
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
* bonzini/migr-coroutine:
migration: move process_incoming_migration to a coroutine
migration: handle EAGAIN while reading QEMUFile
migration: move qemu_fclose to process_incoming_migration
migration: close socket QEMUFile from socket_close
migration: xxx_close will only be called once
migration: use closesocket, not close
migration: use migrate_fd_close in migrate_fd_cleanup
migration: clean up server sockets and handlers before invoking process_incoming_migration
migration: replace qemu_stdio_fd with qemu_get_fd
migration: add qemu_get_fd
migration: consolidate QEMUFile methods in a single QEMUFileOps struct
migration: unify stdio-based QEMUFile operations
Paolo Bonzini [Tue, 7 Aug 2012 09:07:59 +0000 (11:07 +0200)]
migration: handle EAGAIN while reading QEMUFile
This will never happen right now (the assertion would fail). The
next patch will set the socket or pipe in non-blocking mode, thus
enabling this part of the code.
Coroutines can just stop whenever they want with qemu_coroutine_yield.
As soon as select tells the main loop that the migration stream is
readable, the coroutine is re-entered directly in qemu_get_buffer,
where it will read more data and pass it to the loading routines.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Paolo Bonzini [Thu, 27 Sep 2012 11:25:45 +0000 (13:25 +0200)]
migration: use migrate_fd_close in migrate_fd_cleanup
migrate_fd_cleanup will usually close the file descriptor via
buffered_file_close's call to migrate_fd_close. However, in the case
of s->file == NULL it is "inlining" migrate_fd_close (almost: there is a
direct close() instead of using s->close(s)). To fix the inconsistency
and clean up the code, allow multiple calls to migrate_fd_close and use
the function in migrate_fd_cleanup.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Paolo Bonzini [Fri, 21 Sep 2012 10:04:03 +0000 (12:04 +0200)]
migration: unify stdio-based QEMUFile operations
Now that qemu_fseek does not exist anymore, there is no reason to do
an fseek before fread/fwrite when operating on an stdio file.
Thus, unify the get/put_buffer callbacks used by qemu_fopen
with those used for pipes.
Reviewed-by: Orit Wasserman <owasserm@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Eduardo Habkost [Fri, 2 Nov 2012 16:25:15 +0000 (14:25 -0200)]
target-i386: cpu: fix --disable-kvm compilation
This fixes the following:
target-i386/cpu.o: In function `kvm_cpu_fill_host':
target-i386/cpu.c:783: undefined reference to `kvm_state'
I didn't notice the problem before because GCC was optimizing the entire
kvm_cpu_fill_host() function out (because all calls are conditional on
kvm_enabled()).
* cpu_x86_fill_model_id() is used only if CONFIG_KVM is set, so #ifdef it
entirely to avoid compiler warnings.
* kvm_cpu_fill_host() should be called only if KVM is enabled, so
use #ifdef CONFIG_KVM around the entire function body.
Reported-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Andreas Färber <afaerber@suse.de>
Anthony Liguori [Thu, 1 Nov 2012 19:34:13 +0000 (14:34 -0500)]
Merge remote-tracking branch 'kraxel/usb.69' into staging
* kraxel/usb.69: (31 commits)
usb-redir: Allow redirecting super speed devices to high speed controllers
usb-redir: Allow to attach USB 2.0 devices to 1.1 host controller
usb-redir: Use reject rather the disconnect on bad ep info
usb-redir: Add an usbredir_setup_usb_eps() helper function
usb-redir: Add support for input pipelining
usb-redir: Add support for 32 bits bulk packet length
combined-packet: Add a workaround for Linux usbfs + live migration
usb: Add packet combining functions
uhci: Don't crash on device disconnect
uhci: Add a uhci_handle_td_error() helper function
usb/ehci-pci: add helper to create ich9 usb controllers
usb/ehci-pci: add ich9 00:1a.* variant
usb/ehci-pci: dynamic type generation
uhci: add ich9 00:1a.* variants
uhci: stick irq routing info into UHCIInfo too.
uhci: dynamic type generation
xilinx_zynq: add USB controllers
usb/ehci: add sysbus variant
usb/ehci: split into multiple source files
usb/ehci: Guard definition of EHCI_DEBUG
...
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Anthony Liguori [Thu, 1 Nov 2012 16:13:59 +0000 (11:13 -0500)]
Merge remote-tracking branch 'stefanha/net' into staging
* stefanha/net:
e1000: pre-initialize RAH/RAL registers
net: Reject non-netdevs in qmp_netdev_del()
net: use "socket" model name for UDP sockets
e1000: drop check_rxov, always treat RX ring with RDH == RDT as empty
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Anthony Liguori [Thu, 1 Nov 2012 16:12:50 +0000 (11:12 -0500)]
Merge remote-tracking branch 'qemu-kvm/uq/master' into staging
* qemu-kvm/uq/master: (28 commits)
update-linux-headers.sh: Handle new kernel uapi/ directories
target-i386: kvm_cpu_fill_host: use GET_SUPPORTED_CPUID
target-i386: cpu: make -cpu host/check/enforce code KVM-specific
target-i386: make cpu_x86_fill_host() void
Emulate qemu-kvms -no-kvm option
Issue warning when deprecated -tdf option is used
Issue warning when deprecated drive parameter boot=on|off is used
Use global properties to emulate -no-kvm-pit-reinjection
Issue warning when deprecated -no-kvm-pit is used
Use machine options to emulate -no-kvm-irqchip
cirrus_vga: allow configurable vram size
target-i386: Add missing kvm cpuid feature name
i386: cpu: add missing CPUID[EAX=7,ECX=0] flag names
i386: kvm: filter CPUID leaf 7 based on GET_SUPPORTED_CPUID, too
i386: kvm: reformat filter_features_for_kvm() code
i386: kvm: filter CPUID feature words earlier, on cpu.c
i386: kvm: mask cpuid_ext4_features bits earlier
i386: kvm: mask cpuid_kvm_features earlier
i386: kvm: x2apic is not supported without in-kernel irqchip
i386: kvm: set CPUID_EXT_TSC_DEADLINE_TIMER on kvm_arch_get_supported_cpuid()
...
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Peter Maydell [Fri, 26 Oct 2012 15:29:38 +0000 (16:29 +0100)]
arm_boot: Change initrd load address to "halfway through RAM"
To avoid continually having to bump the initrd load address
to account for larger kernel images, put the initrd halfway
through RAM. This allows large kernels on new boards with lots
of RAM to work OK, without breaking existing usecases for
boards with only 32MB of RAM.
Note that this change fixes in passing a bug where we were
passing an overly large max_size to load_image_targphys()
for the initrd, which meant that we wouldn't correctly refuse
to load an enormous initrd that didn't actually fit into RAM.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Aurelien Jarno <aurelien@aurel32.net> Reviewed-by: Igor Mitsyanko <i.mitsyanko@samsung.com> Tested-by: Cole Robinson <crobinso@redhat.com> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Aurelien Jarno [Thu, 1 Nov 2012 15:42:49 +0000 (16:42 +0100)]
Merge branch 'ppc-for-upstream' of git://repo.or.cz/qemu/agraf
* 'ppc-for-upstream' of git://repo.or.cz/qemu/agraf:
pseries: Cleanup duplications of ics_valid_irq() code
pseries: Clean up inconsistent variable name in xics.c
target-ppc: Extend FPU state for newer POWER CPUs
target-ppc: Rework storage of VPA registration state
Revert "PPC: pseries: Remove hack for PIO window"
Aurelien Jarno [Thu, 1 Nov 2012 15:42:29 +0000 (16:42 +0100)]
Merge branch 'arm-devs.for-upstream' of git://git.linaro.org/people/pmaydell/qemu-arm
* 'arm-devs.for-upstream' of git://git.linaro.org/people/pmaydell/qemu-arm: (28 commits)
hw/sd.c: add SD card save/load support
vmstate: Add support for saving/loading bitmaps
hw/sd.c: Fix erase for high capacity cards
pflash_cfi01: Fix debug mode printfery
pflash_cfi0x: QOMified
pflash_cfi01: remove unused total_len field
pflash_cfi0x: remove unused base field
hw/versatile_i2c: Use LOG_GUEST_ERROR
hw/arm_l2x0: Use LOG_GUEST_ERROR
hw/arm_sysctl: Use LOG_GUEST_ERROR
hw/armv7m_nvic: Use LOG_GUEST_ERROR and LOG_UNIMP
hw/arm_timer: Use LOG_GUEST_ERROR and LOG_UNIMP
hw/arm_gic: Use LOG_GUEST_ERROR
hw/arm11mpcore: Use LOG_GUEST_ERROR rather than hw_error()
hw/pl190: Use LOG_UNIMP rather than hw_error()
hw/pl110: Use LOG_GUEST_ERROR rather than hw_error()
hw/pl080: Use LOG_GUEST_ERROR and LOG_UNIMP
hw/pl061: Use LOG_GUEST_ERROR
hw/pl050: Use LOG_GUEST_ERROR
hw/exynos4_boards: Don't prematurely explode QEMUMachineInitArgs
...
Jan Kiszka [Wed, 31 Oct 2012 12:47:15 +0000 (13:47 +0100)]
usb-redir: Allow to attach USB 2.0 devices to 1.1 host controller
This follows the logic of host-linux: If a 2.0 device has no ISO
endpoint and no interrupt endpoint with a packet size > 64, we can
attach it also to an 1.1 host controller. In case the redir server does
not report endpoint sizes, play safe and remove the 1.1 compatibility as
well. Moreover, if we detect a conflicting change in the configuration
after the device was already attached, it will be disconnected
immediately.
HdG: Several small cleanups and fixes
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Hans de Goede [Wed, 31 Oct 2012 12:47:10 +0000 (13:47 +0100)]
combined-packet: Add a workaround for Linux usbfs + live migration
Older versions (anything but the latest) of Linux usbfs + libusb(x),
will submit larger (bulk) transfers split into multiple 16k submissions,
which means that rather then all tds getting linked into the queue in
one atomic operarion they get linked in a bunch at a time, which could
cause problems if:
1) We scan the queue while libusb is in the middle of submitting a split
bulk transfer
2) While this bulk transfer is pending we migrate to another host.
The problem is that after 2, the new host will rescan the queue and
combine the packets in one large transfer, where as 1) has caused the
original host to see them as 2 transfers. This patch fixes this by stopping
combinging if we detect a 16k transfer with its int_req flag set.
This should not adversely effect performance for other cases as:
1) Linux never sets the interrupt flag on packets other then the last
2) Windows does set the in_req flag on each td, but will submit large
transfers in 20k tds thus never triggering the check
Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Hans de Goede [Wed, 31 Oct 2012 12:47:09 +0000 (13:47 +0100)]
usb: Add packet combining functions
Currently we only do pipelining for output endpoints, since to properly
support short-not-ok semantics we can only have one outstanding input
packet. Since the ehci and uhci controllers have a limited per td packet
size guests will split large input transfers to into multiple packets,
and since we don't pipeline these, this comes with a serious performance
penalty.
This patch adds helper functions to (re-)combine packets which belong to 1
transfer at the guest device-driver level into 1 large transger. This can be
used by (redirection) usb-devices to enable pipelining for input endpoints.
This patch will combine packets together until a transfer terminating packet
is encountered. A terminating packet is a packet which meets one or more of
the following conditions:
1) The packet size is *not* a multiple of the endpoint max packet size
2) The packet does *not* have its short-not-ok flag set
3) The packet has its interrupt-on-complete flag set
The short-not-ok flag of the combined packet is that of the terminating packet.
Multiple combined packets may be submitted to the device, if the combined
packets do not have their short-not-ok flag set, enabling true pipelining.
If a combined packet does have its short-not-ok flag set the queue will
wait with submitting further packets to the device until that packet has
completed.
Once enabled in the usb-redir and ehci code, this improves the speed (MB/s)
of a Linux guest reading from a USB mass storage device by a factor of
1.2 - 1.5.
And the main reason why I started working on this, when reading from a pl2303
USB<->serial converter, it combines the previous 4 packets submitted per
device-driver level read into 1 big read, reducing the number of packets / sec
by a factor 4, and it allows to have multiple reads outstanding. This allows
for much better latency tolerance without the pl2303's internal buffer
overflowing (which was happening at 115200 bps, without serial flow control).
Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Hans de Goede [Wed, 31 Oct 2012 11:54:37 +0000 (12:54 +0100)]
uhci: Don't crash on device disconnect
My recent uhci cleanup series has introduced a regression, where
qemu sometimes crashes on a device disconnect. The problem is that
the uhci code never checked for a device not / no longer existing, instead
it was relying on usb_handle_packet accepting a NULL device.
But since we now pass usb_handle_packet q->ep->dev, rather then just
a local dev variable, we crash as q->ep == NULL due to the device no longer
existing.
This patch fixes this. Note that this patch also improves over
the old behavior were we would:
1) create a queue for the device
2) create an async for the packet
3) have usb_handle_packet fail
4) destroy the async
5) wait for the queue to be idle for 32 frames
6) destroy the queue
Which was rather sub-optimal.
Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Gerd Hoffmann [Wed, 10 Oct 2012 11:29:43 +0000 (13:29 +0200)]
pixman/vnc: use pixman images in vnc.
The vnc code uses *three* DisplaySurfaces:
First is the surface of the actual QemuConsole, usually the guest
screen, but could also be a text console (monitor/serial reachable via
Ctrl-Alt-<nr> keys). This is left as-is.
Second is the current server's view of the screen content. The vnc code
uses this to figure which parts of the guest screen did _really_ change
to reduce the amount of updates sent to the vnc clients. It is also
used as data source when sending out the updates to the clients. This
surface gets replaced by a pixman image. The format changes too,
instead of using the guest screen format we'll use fixed 32bit rgb
framebuffer and convert the pixels on the fly when comparing and
updating the server framebuffer.
Third surface carries the format expected by the vnc client. That isn't
used to store image data. This surface is switched to PixelFormat and a
boolean for bigendian byte order.
Gerd Hoffmann [Wed, 10 Oct 2012 09:16:26 +0000 (11:16 +0200)]
console: don't set PixelFormat alpha fields for 32bpp
Currently it is inconstent, PixelFormat->amask is left unset whereas
abits and amax and ashift are filled. As an alpha channel doesn't make
sense for the vga framebuffer leave all alpha fields clear.
Surfaces are now allocated using pixman. DisplaySurface gets new
struct fields with pixman image and data. DisplayChangeListeners
can easily start using pixman now.
Guard against re-definition of EHCI_DEBUG. Allows for turning on of debug info
from configure (using --qemu-extra-cflags="-DEHCI_DEBUG=1") rather than source
code hacking.
Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Seperate the PCI stuff from the EHCI components. Extracted the PCIDevice
out into a new wrapper struct to make EHCIState non-PCI-specific. Seperated
tho non PCI init component out into a seperate "common" init function.
Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Pull the DMAContext for the PCI DMA out at device init time and put it into
the device state. Use dma_memory_read/write() instead of pci specific versions.
Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Gerd Hoffmann [Fri, 26 Oct 2012 08:10:54 +0000 (10:10 +0200)]
xhci: add {get,set}_field macros & enum for pls
Add {get,set}_field macros (simliar to ehci) to read and update
some bits of a word. Put them into use for updating pls (port
link state) values. Also add a enum for pls values.
Add pixman submodule as fallback for old distros.
Picking version 0.18.4. This is shipped by rhel6
and also the minimum version needed by spice so this
should serve well as baseline.
Gerd Hoffmann [Tue, 9 Oct 2012 15:10:13 +0000 (17:10 +0200)]
vga: fix text mode updating
With both text (curses) and graphics (vnc/sdl/spice/...) display active
vga text mode emulation fails to update both correctly. Depending on
whenever vga_update_text() or vga_draw_text() happens to be called first
only the text display or only the graphics display will see display
resolution changes and full redraws.
Fix it by calling both text/gfx resize functions in both code paths and
keep track of full screen redraws needed in VGACommonState fields.
Gerd Hoffmann [Fri, 4 Jun 2010 09:51:31 +0000 (11:51 +0200)]
console: add unregister_displaychangelistener
Also change the way the gui_timer is initialized: each time a
displaychangelistener is registered or unregistered we'll check
whether we need a timer (due to dpy_refresh callback being present)
and if so setup a timer, otherwise zap it. This way the gui timer
works correctly with displaychangelisteners coming and going.
David Gibson [Mon, 29 Oct 2012 17:25:00 +0000 (17:25 +0000)]
pseries: Clean up inconsistent variable name in xics.c
Throughout xics.c 'nr' is used to refer to a global interrupt number, and
'server' is used to refer to an interrupt server number (i.e. CPU number).
Except in icp_set_mfrr(), where 'nr' is used as a server number. Fix this
confusing inconsistency.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Alexander Graf <agraf@suse.de>
David Gibson [Mon, 29 Oct 2012 17:24:59 +0000 (17:24 +0000)]
target-ppc: Extend FPU state for newer POWER CPUs
This patch adds some extra FPU state to CPUPPCState. Specifically,
fpscr is extended to a target_ulong bits, since some recent (64 bit)
CPUs now have more status bits than fit inside 32 bits. Also, we add
the 32 VSR registers present on CPUs with VSX (these extend the
standard FP regs, which together with the Altivec/VMX registers form a
64 x 128bit register file for VSX).
We don't actually support the instructions using these extra registers
in TCG yet, but we still need a place to store the state so we can
sync it with KVM and savevm/loadvm it. This patch updates the savevm
code to not fail on the extended state, but also does not actually
save it - that's a project for another patch.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Alexander Graf <agraf@suse.de>
David Gibson [Mon, 29 Oct 2012 17:24:58 +0000 (17:24 +0000)]
target-ppc: Rework storage of VPA registration state
We change the storage of the VPA information to explicitly use fixed
size integer types which will make life easier for syncing this data with
KVM, which we will need in future.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
[agraf: fix commit message] Signed-off-by: Alexander Graf <agraf@suse.de>
Gabriel L. Somlo [Wed, 31 Oct 2012 18:15:39 +0000 (14:15 -0400)]
e1000: pre-initialize RAH/RAL registers
Some guest operating systems' drivers (Mac OS X in particular) fail to
properly initialize the Receive Address registers (probably expecting
them to be pre-initialized by an earlier component, such as a specific
proprietary BIOS). This patch pre-initializes the RA registers, allowing
OS X networking to function properly. Other guest operating systems are
not affected, and free to (re)initialize these registers during boot.
[According to the datasheet the Address Valid bits in the RA registers
are cleared on PCI or software reset. This patch adds the NIC's MAC
address and sets Address Valid on reset. So we diverge from real
hardware behavior here. -- Stefan]
Signed-off-by: Gabriel Somlo <somlo@cmu.edu> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Stefan Hajnoczi [Wed, 24 Oct 2012 12:34:12 +0000 (14:34 +0200)]
net: Reject non-netdevs in qmp_netdev_del()
The netdev_del command crashes when given a -net device, because it
calls qemu_opts_del(NULL).
Check that this is a -netdev before attempting to delete it and the
QemuOpts.
Note the subtle change from qemu_find_opts_err("netdev", errp) to
qemu_find_opts_err("netdev", NULL). Since "netdev" is a built in
options group and we don't check for NULL return anyway, there's no use
in passing errp here.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Lei Li [Thu, 1 Nov 2012 09:39:55 +0000 (17:39 +0800)]
net: use "socket" model name for UDP sockets
Fix the problem that can not delete the udp socket.
It's caused by passing "udp" model to net_socket_udp_init,
but we do not have "udp" model in our model list.
Pass the right model "socket" to init function.
Aurelien Jarno [Tue, 9 Oct 2012 19:53:21 +0000 (21:53 +0200)]
target-mips: don't flush extra TLB on permissions upgrade
If the guest uses a TLBWI instruction for upgrading permissions, we
don't need to flush the extra TLBs. This improve boot time performance
by about 10%.
Aurelien Jarno [Tue, 9 Oct 2012 19:53:21 +0000 (21:53 +0200)]
target-mips: use deposit instead of hardcoded version
Use the deposit op instead of and hardcoded bit field insertion. It
allows the host to emit the corresponding instruction if available.
At the same time remove the (lsb > msb) test. The MIPS64R2 instruction
set manual says "Because of the instruction format, lsb can never be
greater than msb, so there is no UNPREDICATABLE case for this
instruction."
(Bug reported as LP:1071149.) Cc: Никита Канунников <n.kanunnikov@sbtcom.ru> Reviewed-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Aurelien Jarno [Tue, 9 Oct 2012 19:53:21 +0000 (21:53 +0200)]
target-mips: optimize ddiv/ddivu/div/divu with movcond
The result of a division by 0, or a division of INT_MIN by -1 in the
signed case, is unpredictable. Just replace 0 by 1 in that case so that
it doesn't trigger a floating point exception on the host.
Reviewed-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Aurelien Jarno [Tue, 9 Oct 2012 19:53:21 +0000 (21:53 +0200)]
target-mips: don't use local temps for store conditional
Store conditional operations only need local temps in user mode. Fix
the code to use temp local only in user mode, this spares two memory
stores in system mode.
At the same time remove a wrong a wrong copied & pasted comment,
store operations don't have a register destination.
Reviewed-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
projects / qemu-xen.git / log