vmdk: Optimize cluster allocation

This drops the unnecessary bdrv_truncate() from, and also improves,
cluster allocation code path.

Before, when we need a new cluster, get_cluster_offset truncates the
image to bdrv_getlength() + cluster_size, and returns the offset of
added area, i.e. the image length before truncating.

This is not efficient, so it's now rewritten as:

  - Save the extent file length when opening.

  - When allocating cluster, use the saved length as cluster offset.

  - Don't truncate image, because we'll anyway write data there: just
    write any data at the EOF position, in descending priority:

    * New user data (cluster allocation happens in a write request).

    * Filling data in the beginning and/or ending of the new cluster, if
      not covered by user data: either backing file content (COW), or
      zero for standalone images.

One major benifit of this change is, on host mounted NFS images, even
over a fast network, ftruncate is slow (see the example below). This
change significantly speeds up cluster allocation. Comparing by
converting a cirros image (296M) to VMDK on an NFS mount point, over
1Gbe LAN:

    $ time qemu-img convert cirros-0.3.1.img /mnt/a.raw -O vmdk

    Before:
        real    0m21.796s
        user    0m0.130s
        sys     0m0.483s

    After:
        real    0m2.017s
        user    0m0.047s
        sys     0m0.190s

We also get rid of unchecked bdrv_getlength() and bdrv_truncate(), and
get a little more documentation in function comments.

Tested that this passes qemu-iotests for all VMDK subformats.

Signed-off-by: Fam Zheng <famz@redhat.com>

---
V3: A new implementation following Kevin's suggestion.
linux-user: Add /proc/self/exe open forwarding

QEMU already supports /proc/self/{maps,stat,auxv} so addition of
/proc/self/exe is rather trivial.

Fixes https://bugs.launchpad.net/qemu/+bug/1299190

Signed-off-by: Maxim Ostapenko <m.ostapenko@partner.samsung.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
linux-user: Assert stack used for auxvec, envp, argv

Assert that the amount of stack space used for auxvec, envp & argv
exactly matches the amount allocated. This catches if DLINFO_ITEMS isn't
updated when another NEW_AUX_ENT is added.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Riku Voipio <riku.voipio@iki.fi>
Cc: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
linux-user: Move if-elses to a switch statement.

This makes adding more message types cleaner.

Signed-off-by: Huw Davies <huw@codeweavers.com>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
linux-user: Add support for SCM_CREDENTIALS.

Signed-off-by: Huw Davies <huw@codeweavers.com>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
linux-user: Handle arches with llseek instead of _llseek

Recently merged kernel ports (such as OpenRISC and Meta) have an llseek
system call instead of _llseek. This is handled for the host
architecture by defining __NR__llseek as __NR_llseek, but not for the
target architecture.

Handle it in the same way for these architectures, defining
TARGET_NR__llseek as TARGET_NR_llseek.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Riku Voipio <riku.voipio@iki.fi>
Cc: Jia Liu <proljc@gmail.com>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
linux-user: avoid using glibc internals in _syscall5 and in definition of target_sigevent struct

Use the public sigset_t instead of the glibc specific internal
__sigset_t in _syscall.

Calculate the sigevent pad size is calculated in similar way as kernel
does it instead of using glibc internal field _pad.

This is needed for building with musl libc.

Signed-off-by: Natanael Copa <ncopa@alpinelinux.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
linux-user/signal.c: Set fault address in AArch64 signal info

Set the fault address correctly in the signal information passed
to a signal handler for AArch64 guests.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
linux-user: rename cpu-uname -> uname

To move more uname related functions out of syscall.c,
rename cpu-uname.{c,h} to uname.{c.h}

Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
linux-user: move uname functions to uname.c

Make syscall.c slightly smaller by moving uname-related
functions to uname.c.

Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
linux-user: remove configure option for setting uname release

--enable-uname-release was a rather heavyweight hammer, as it allows
providing values less that UNAME_MINIMUM_RELEASE. Also, it affects
all built linux-user targets, which in most cases is not what user
wants.

Now that we have UNAME_MINIMUM_RELEASE for all linux-user platforms,
we can drop --enable-uname-release and the related CONFIG_UNAME_RELEASE
define.

Users can still override the variable with QEMU_UNAME=2.6.32 or -r
command line option. If distributors need to update a minimum version
for a specific target, it can be done by updating UNAME_MINIMUM_RELEASE.

Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
linux-user/elfload.c: Fix incorrect ARM HWCAP bits

The ELF HWCAP bits for ARM features THUMBEE, NEON, VFPv3 and VFPv3D16 are
all off by one compared to the kernel definitions. Fix this discrepancy
and add in the missing CRUNCH bit which was the cause of the off-by-one
error. (We don't emulate any of the CPUs which have that weird hardware,
so it's otherwise uninteresting to us.)

Cc: qemu-stable@nongnu.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
linux-user/elfload.c: Update ARM HWCAP bits

The kernel has added support for a number of new ARM HWCAP bits;
add them to QEMU, including support for setting them where we have
a corresponding CPU feature bit.

We were also incorrectly setting the VFPv3D16 HWCAP -- this means
"only 16 D registers", not "supports 16-bit floating point format";
since QEMU always has 32 D registers for VFPv3, we can just remove
the line that incorrectly set this bit.

The kernel does not set the HWCAP_FPA even if it is providing FPA
emulation via nwfpe, so don't set this bit in QEMU either.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Cc: qemu-stable@nongnu.org
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
linux-user/elfload.c: Fix A64 code which was incorrectly acting like A32

The ARM target-specific code in elfload.c was incorrectly allowing
the 64-bit ARM target to use most of the existing 32-bit definitions:
most noticably this meant that our HWCAP bits passed to the guest
were wrong, and register handling when dumping core was totally
broken. Fix this by properly separating the 64 and 32 bit code,
since they have more differences than similarities.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Cc: qemu-stable@nongnu.org
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
linux-user/elfload.c: Support ARM HWCAP2 flags

The ARM kernel has chosen to spill into the HWCAP2 ELF feature bit flags
early, even though it hasn't yet exhausted all 32 bits of the HWCAP word.
Add support for setting this in the same way we do for HWCAP.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
target-alpha: Fix RDUSP

Commit 06ef8604e92964cbf30084b7d31091aa7cbbb62f contained a typo.

Signed-off-by: Richard Henderson <rth@twiddle.net>
pc: add 2.1 machine type

At the moment, 2.1 and 2.0 machines are identical.
As several people are working on incompatible changes
to the PC machine, collaboration will be made easier
by merging this place-holder.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
E820: Add interface for accessing e820 table

Add the following two functions:

  - e820_get_num_entries() - query the size of the e820 table
  - e820_get_entry() - grab an entry matching a given set of criteria

This interface is currently necessary for creating type 19
(memory array mapped address) structures in smbios.

Signed-off-by: Gabriel Somlo <somlo@cmu.edu>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
SMBIOS: Rename symbols to better reflect future use

Rename the following symbols:

  - smbios_set_type1_defaults() to the more general smbios_set_defaults();
  - bool smbios_type1_defaults to the more general smbios_defaults;
  - smbios_get_table() to smbios_get_table_legacy();

This patch contains no functional changes.

Signed-off-by: Gabriel Somlo <somlo@cmu.edu>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
SMBIOS: Update header file definitions

Add definitions for smbios entry point (anchor), and for type 2
(base board) structure which is required by some versions of OS X.

Remove definition for type 20 (memory device mapped address)
structure, which is no longer required as of smbios spec v2.5.

Update all other structure definitions to bring them into
compliance with smbios spec v2.8.

This patch contains no functional changes.

Signed-off-by: Gabriel Somlo <somlo@cmu.edu>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>