Add a new float_flag_output_denormal which is set when the result
of a floating point operation would be denormal but is flushed to
zero because we are in flush_to_zero mode. This is necessary because
some architectures signal this condition as an underflow and others
signal it as an inexact result.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

The helpers for VRECPE.F32, VSQRTE.F32, VRECPS and VRSQRTS handle denormals
as special cases, so we must set the InputDenormal exception flag ourselves.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

The functions which do the core estimation algorithms for the VRSQRTE
and VRECPE instructions should not set floating point exception flags,
so use a local fp status for doing these calculations.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

If an op with dead outputs is not removed, because it has side effects
or has multiple output and only one dead, mark the registers as dead
instead of saving them. This avoid a few register spills on TCG targets
with low register count, especially with div2 and mul2 ops, or when a
qemu_ld* result is not used (prefetch emulation for example).
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

If an op is not removed and has dead output arguments, mark it
in op_dead_args similarly to what is done for input arguments.
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

Allow all args to be dead by replacing the input specific op_dead_iargs
variable by op_dead_args. Note this is a purely mechanical change.
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

* 'trivial-patches' of git://repo.or.cz/qemu/stefanha:
  Fix typos in comments (chek -> check)
  hw/sd.c: Don't complain about SDIO commands CMD52/CMD53
  hw/realview.c: Remove duplicate #include line
  piix_pci: fix piix3_set_irq_pic()

* 'ppc-next' of git://repo.or.cz/qemu/agraf:
  Fix a bug in mtsr/mtsrin emulation on ppc64
  pSeries: Clean up write-only variables
  w32: Fix compilation and replace non-portable usage of ulong

* 's390-next' of git://repo.or.cz/qemu/agraf:
  s390x: complain when allocating ram fails
  s390x: fix memory detection for guests > 64GB
  s390x: change mapping base to allow guests > 2GB
  s390x: Fix debugging for unknown sigp order codes
  s390x: build s390x by default
  s390x: remove compatibility cc field
  s390x: Adjust GDB stub
  s390x: translate engine for s390x CPU
  s390x: Adjust internal kvm code
  s390x: Implement opcode helpers
  s390x: helper functions for system emulation
  s390x: Shift variables in CPUState for memset(0)
  s390x: keep hint on virtio managing size
  s390x: make kvm exported functions conditional on kvm
  s390x: s390x-linux-user support
  tcg: extend max tcg opcodes when using 64-on-32bit
  s390x: fix smp support for kvm

Signed-off-by: NStefan Weil <weil@mail.berlios.de>
Signed-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>

The SDIO specification introduces new commands 52 and 53.
Handle as illegal command but do not complain on stderr,
as SDIO-aware OSes (including Linux) may legitimately use
these in their probing for presence of an SDIO card.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>

Remove a duplicate #include of sysbus.h.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>

If pic_irq is greater than 7, the irq level is always 0 on 32bits.
Signed-off-by: NTeLeMan <geleman@gmail.com>
Signed-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>

tb_invalidate_page_range() was intended to be used to invalidate an
area of a TB which the guest explicitly flushes from i-cache. However,
QEMU detects writes to code areas where TBs have been generated, so
his has never been useful.

Delete the function, adjust callers.
Reviewed-by: NRichard Henderson <rth@twiddle.net>
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

Early ppc64 CPUs include a hack to partially simulate the ppc32 segment
registers, by translating writes to them into writes to the SLB.  This is
not used by any current Linux kernel, but it is used by the openbios used
in the qemu mac99 model.

Commit 81762d6d, cleaning up the SLB
handling introduced a bug in this code, breaking the openbios currently in
qemu.  Specifically, there was an off by one error bitshuffling the
register format used by mtsr into the format needed for the SLB load,
causing the flag bits to end up in the wrong place.  This caused the
storage keys to be wrong under openbios, meaning that the translation code
incorrectly thought a legitimate access was a permission violation.

This patch fixes the bug, at the same time it fixes some build bug in the
MMU debugging code (only exposed when DEBUG_MMU is enabled).
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
Signed-off-by: NAlexander Graf <agraf@suse.de>

A few pieces of the pSeries emulation code have variables which are set
but never used, which causes warnings on gcc 4.6.  This patch removes
these instances.
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
Signed-off-by: NAlexander Graf <agraf@suse.de>

ulong is undefined for w32 (and maybe other) compilations.
Replace it by uintptr_t (which also fixes compilation for w64
and is a better choice for pointer to integer conversions).

Cc: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: NStefan Weil <weil@mail.berlios.de>
Reviewed-by: NAurelien Jarno <aurelien@aurel32.net>
Signed-off-by: NAlexander Graf <agraf@suse.de>

While trying out the > 64GB guest RAM patch, I hit some virtual address
limitations of my host system, which resulted in mmap failing. Unfortunately,
qemu didn't tell me about this failure, but just used the NULL pointer
happily, resulting in either segmentation faults or other fun errors.

To spare other users from tracing this down, let's print a nice message
instead so the user can figure out what's wrong from there.
Signed-off-by: NAlexander Graf <agraf@suse.de>

the s390 memory detection has a 16bit field that specifies the amount of
increments. This patch adopts the memory size to always fit into that
scheme. This also fixes virtio detection for these guests, since the
descriptor page is located after the main memory.
Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>

the current s390x qemu memory layout is

0x1000000: guest start
0x80000000: qemu binary

which limits the amount of available memory to <2GB.
This patch moves the guest pages to 32GB to not collide with the binary
and to leave some space for the program break of qemu.
Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>

On unknown sigp order codes we print a debug message. This patch
fixes the output, since we want to see the order_code and not
the register numbers.
Patch applies on agraf tree.
Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>

This patch enables building of s390x-softmmu and s390x-linux-user
targets by default.
Signed-off-by: NAlexander Graf <agraf@suse.de>

Remove the now unused cc field that was only required to not break
bisectability.
Signed-off-by: NAlexander Graf <agraf@suse.de>

We have successfully lazilized cc computation, so we need to manually
trigger its calculation when gdb wants to fetch it. We also changed the
variable name, so writing it writes into a different field now.
Signed-off-by: NAlexander Graf <agraf@suse.de>

This is the main meat part of the patch set. It implements emulation for an
s390x CPU.

The code does all the optimizations that are common for TCG code:

 - direct branches
 - cc optimization
 - unrolling of simple microcode loops

I'm still open for suggestions on speedups of course :).
Signed-off-by: NAlexander Graf <agraf@suse.de>

We're now finally emulating an s390x CPU, so we can move quite some logic
from the kvm code out into generic CPU code.

This patch does this and adjusts the interfaces according to what the code
around now expects to be able to call.
Signed-off-by: NAlexander Graf <agraf@suse.de>

There are some instructions that can't (or shouldn't) be expressed by pure
tcg code. For those, we call into externally compiled C functions.

This patch implements those C functions.
Signed-off-by: NAlexander Graf <agraf@suse.de>

When running system emulation, we need to transverse through the MMU and
deliver interrupts according to the specification.

This patch implements those two pieces and in addition adjusts the CPU
initialization code to account for the new fields in CPUState.
Signed-off-by: NAlexander Graf <agraf@suse.de>

The default reset handler does a memset(0) until right in between CPU_COMMON.
I incorrectly changed that behavior on the s390x port, so let's move the fields
in CPUState around to reflect the correct split up to which point memset(0)
zeros out everything.
Signed-off-by: NAlexander Graf <agraf@suse.de>

The s390x virtio bus keeps management information on virtio after the top
of the guest's RAM. We need to be able to tell the guest the size of its
RAM (without virtio stuff), but also be able to trap when the guest accesses
RAM outside of its scope (including virtio stuff).

So we need a variable telling us the size of the virtio stuff, so we can
calculate the highest available RAM address from that.

While at it, also increase the maximum number of virtio pages, so we play
along well with more recent kernels that spawn a ridiculous number of virtio
console adapters.
Signed-off-by: NAlexander Graf <agraf@suse.de>

We have some helper functions we use to directly invoke KVM
functionality from device emulation code.

This patch replaces those exported functions with static inline
stubs when not building with KVM enabled.
Signed-off-by: NAlexander Graf <agraf@suse.de>

This patch adds support for running s390x binaries in the linux-user emulation
code.
Signed-off-by: NUlrich Hecht <uli@suse.de>
Signed-off-by: NAlexander Graf <agraf@suse.de>

When running a 64 bit guest on a 32 bit host, we tend to use more TCG ops
than on a 64 bit host. Reflect that in the reserved opcode amount constant.
Signed-off-by: NAlexander Graf <agraf@suse.de>

Currently smp support for kvm does not work. Qemu does a kvm run even on
secondary CPUs which dont have a sane state (initial psw == 0)
triggering some program faults. Architecturally these cpus are in the stopped
state, so we should not do the kvm run ioctl. (these CPUs will be started
by a SIGP restart later during the boot process)

We need to tell the loop that this cpu should not run. Jan Kiszka pointed
out that kvm_arch_process_async_events is the right place to do.
Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>

AHCI provides two ways of reading/writing data:

 1) NCQ
 2) ATA commands with the LBA in the command FIS

In the second code path, we didn't handle any LBAs that were bigger than
16 bits, so whenever a guest that used high LBA numbers wanted to access
data, the LBA got truncated down to 16 bits, giving the guest garbage.

This patch adds support for LBAs higher than 16 bits. I've tested that it
works just fine with SeaBIOS and Linux guests. This patch also unbreaks
the often reported grub errors people have seen with AHCI.
Signed-off-by: NAlexander Graf <agraf@suse.de>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

No users of bdrv_get_type_hint() left.  bdrv_set_type_hint() can make
the media removable by side effect.  Make that explicit.
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

DriveInfo is closely tied to -drive, and like -drive, it mixes
information about host and guest part of the block device.  Unlike
DriveInfo, BlockDriverState should be about the host part only.

One of the remaining guest bits there is the "type hint".  -drive
option media sets it, and qdevs "ide-drive", "scsi-disk" and non-qdev
IF_XEN devices check it to pick HD vs. CD.

Communicate -drive option media via new DriveInfo member media_cd
instead.
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

query-block's specification documents response member "type" with
values "hd", "cdrom", "floppy", "unknown".

Its value is unreliable: a block device used as floppy has type
"floppy" if created with if=floppy, but type "hd" if created with
if=none.

That's because with if=none, the type is at best a declaration of
intent: the drive can be connected to any guest device.  Its type is
really the guest device's business.  Reporting it here is wrong.

No known user of QMP uses "type".  It's unlikely that any unknown
users exist, because its value is useless unless you know how the
block device was created.  But then you also know the true value.

Fixing the broken value risks breaking (hypothetical!) clients that
somehow rely on the current behavior.  Not fixing the value risks
breaking (hypothetical!) clients that rely on the value to be
accurate.  Can't entirely avoid hypothetical lossage.  Change the
value to be always "unknown".

This makes "info block" always report "type=unknown".  Pointless.
Change it to not report the type.
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

ide-hd has to suppress the default CD-ROM, or else you can't put one
on secondary master without -nodefaults.

Unlike legacy scsi-disk, scsi-cd suppresses default CD-ROM.
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

A "scsi-disk" is either a hard disk or a CD-ROM, depending on the
associated BlockDriverState's type hint.  Unclean; disk vs. CD belongs
to the guest part, not the host part.

Have separate qdevs "scsi-hd" and "scsi-cd" to model disk vs. CD in
the guest part.

Keep scsi-disk for backward compatibility.

Don't copy scsi-disk property removable to scsi-cd.  It's not used and
always zero(!) there.
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>