cpu: Avoid QOM casts for CPU()

CPU address spaces touching load and store helpers as well as the
movement of (almost) all fields from CPU_COMMON to CPUState have led to
a noticeable increase of CPU() usage in "hot" paths for both TCG and KVM.

While CPU()'s OBJECT_CHECK() might help detect development errors, i.e.
in form of crashes due to QOM vs. non-QOM mismatches rather than QOM
type mismatches, it is not really needed at runtime since mostly used in
CPU-specific paths, coming from a target-specific CPU subtype. If that
pointer is damaged, other errors are highly likely to occur elsewhere
anyway.

Keep the CPU() macro for a consistent developer experience and for
flexibility to exchange its implementation, but turn it into a pure,
unchecked C cast for now.

Compare commit 6e42be7cd10260fd3a006d94f6c870692bf7a2c0.

Reported-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Merge remote-tracking branch 'remotes/afaerber/tags/qom-cpu-for-2.0' into staging

QOM CPUState refactorings / X86CPU

* X86CPU IA32e 1GB paging support
* Performance quickfix for CPU() cast macro

# gpg: Signature made Mon 31 Mar 2014 18:33:27 BST using RSA key ID 3E7E013F
# gpg: Good signature from "Andreas Färber <afaerber@suse.de>"
# gpg:                 aka "Andreas Färber <afaerber@suse.com>"

* remotes/afaerber/tags/qom-cpu-for-2.0:
  cpu: Avoid QOM casts for CPU()
  target-i386: x86_cpu_get_phys_page_debug(): support 1GB page translation

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
pci: Fix clearing IRQs on reset

irq_state is cleared before calling pci_device_deassert_intx, but the
latter misbehaves if the former isn't accurate. In this case, any raised
IRQs are not cleared, which hits an assertion in pcibus_reset:

qemu-system-x86_64: hw/pci/pci.c:250: pcibus_reset: Assertion
`bus->irq_count[i] == 0' failed.

pci_device_deassert_intx should clear irq_state anyways, so add
an assert.

This fixes migration with usb2 + usb-tablet.

Signed-off-by: Cole Robinson <crobinso@redhat.com>
Message-id: 7da1ad94ce027183b4049c2de370cb191b0073c1.1396290569.git.crobinso@redhat.com
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
configure: add option to disable -fstack-protector flags

The -fstack-protector flag family is useful for ensuring safety and for
debugging, but has a performance impact. Here are some boot time comparisons of
the various versions of -fstack-protector using qemu-system-arm on an x86_64
host:

    # -fstack-protector-all
    Startup finished in 1.810s (kernel) + 12.331s (initrd) + 49.016s (userspace) = 1min 3.159s
    Startup finished in 1.801s (kernel) + 12.287s (initrd) + 47.925s (userspace) = 1min 2.013s
    Startup finished in 1.812s (kernel) + 12.302s (initrd) + 47.995s (userspace) = 1min 2.111s

    # -fstack-protector-strong
    Startup finished in 1.744s (kernel) + 11.223s (initrd) + 44.688s (userspace) = 57.657s
    Startup finished in 1.721s (kernel) + 11.222s (initrd) + 44.194s (userspace) = 57.138s
    Startup finished in 1.693s (kernel) + 11.250s (initrd) + 44.426s (userspace) = 57.370s

    # -fstack-protector
    Startup finished in 1.705s (kernel) + 11.409s (initrd) + 43.563s (userspace) = 56.677s
    Startup finished in 1.877s (kernel) + 11.137s (initrd) + 43.719s (userspace) = 56.734s
    Startup finished in 1.708s (kernel) + 11.141s (initrd) + 43.628s (userspace) = 56.478s

    # no stack protector
    Startup finished in 1.743s (kernel) + 11.190s (initrd) + 43.709s (userspace) = 56.643s
    Startup finished in 1.763s (kernel) + 11.216s (initrd) + 43.767s (userspace) = 56.747s
    Startup finished in 1.711s (kernel) + 11.283s (initrd) + 43.878s (userspace) = 56.873s

This patch introduces a configure option to disable the stack protector
entirely, and conditional stack protector flag selection (in order,
based on availability): -fstack-protector-strong, -fstack-protector-all,
no stack protector.

Signed-off-by: Steven Noonan <snoonan@amazon.com>
Cc: Anthony Liguori <aliguori@amazon.com>
Reviewed-by: Stefan Weil <sw@weilnetz.de>
[Prefer -fstack-protector-all to -fstack-protector, suggested by
 Laurent Desnogues. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Revert "qtest: Fix crash if SIGABRT during qtest_init()"

It turns out there are test cases that use multiple libqtest instances.
We cannot use a global qtest instance in the SIGABRT handler.

This reverts commit cb201b4872f16dfbce63f8648b2584631e2e965f.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Marcel Apfelbaum <marcel.a@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
qtest: Keep list of qtest instances for SIGABRT handler

Keep track of active qtest instances so we can kill them when the test
aborts.  This ensures no QEMU processes are left running after test
failure.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Marcel Apfelbaum <marcel.a@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
tests: Remove unsupported tests for MinGW

test_timer_schedule and test_source_timer_schedule don't compile for MinGW
because some functions are not implemented for MinGW (qemu_pipe,
aio_set_fd_handler).

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
tests: Skip POSIX-only tests on Windows

test-rfifolock and test-vmstate only build on POSIX hosts.  Exclude them
if building for Windows.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Andreas Färber <afaerber@suse.de>
tests: Correctly skip qtest on non-POSIX hosts

qtest test cases only work on POSIX hosts.  The following line only
defines dependencies for qtest binaries on POSIX hosts:

  check-qtest-$(CONFIG_POSIX)=$(foreach TARGET,$(TARGETS),$(check-qtest-$(TARGET)-y))

But the QTEST_TARGETS definition earlier in the Makefile fails to check
CONFIG_POSIX.  This causes make targets to be generated for qtest test
cases even though we don't know how to build the binaries.

The following error message is printed when trying to run gtester on a
binary that was never built:

  GLib-WARNING **: Failed to execute test binary: tests/endianness-test.exe: Failed to execute child process "tests/endianness-test.exe" (No such file or directory)

This patch makes QTEST_TARGETS empty on non-POSIX hosts.  This prevents
the targets from being generated.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
nvme: Permit zero-length block devices

It may not be sensible for normal use cases, but it allows to use
/dev/null in QTest.

Acked-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
tests: Add nvme qtest

Acked-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
tests: Add virtio-9p qtest

Make it conditional to 9p availability.
Create a temporary directory to share.

Signed-off-by: Andreas Färber <afaerber@suse.de>
tests: Add pvpanic qtest

Signed-off-by: Andreas Färber <afaerber@suse.de>
qtest: Factor out qtest_qmp_receive()

Signed-off-by: Andreas Färber <afaerber@suse.de>
pvpanic-test: Assert pause event

Signed-off-by: Andreas Färber <afaerber@suse.de>
tests: Add i82801b11 qtest

Signed-off-by: Andreas Färber <afaerber@suse.de>
tmp105: Read temperature in milli-celsius

Right now, the temperature property must be written in milli-celsius,
but it reads back the value in 8.8 fixed point.  Fix this by letting the
property read back the original value (possibly rounded).  Also simplify
the code that does the conversion.

Before:

    (QEMU) qom-set path=/machine/peripheral/sensor property=temperature value=20000
    {u'return': {}}
    (QEMU) qom-get path=sensor property=temperature
    {u'return': 5120}

After:

    (QEMU) qom-set path=/machine/peripheral/sensor property=temperature value=20000
    {u'return': {}}
    (QEMU) qom-get path=sensor property=temperature
    {u'return': 20000}

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
tmp105-test: Wrap simple building blocks for testing

The next patches will add more reads and writes.  Add a simple testing
API for this.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
tmp105-test: Add a second sensor and test that one

This will make it easier to reach the device under test via QOM.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
tmp105-test: Test QOM property and precision

This adds a regression test for commit
efdf6a56a7c73753dd135ed085a223a119b5d805 (tmp105: Read temperature in
milli-celsius).

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>