target-arm: Use target_phys_addr_t in get_phys_addr()

In the implementation of get_phys_addr(), consistently use
target_phys_addr_t to hold the physical address rather than
uint32_t.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
target-arm: Implement long-descriptor PAR format

Implement the different format of the PAR when long descriptor
translation tables are in use. Note that we assume that
get_phys_addr() returns a long-descriptor format DFSR value on
failure if long descriptors are in use; this added subtlety tips
the balance and makes it worth adding a comment documenting the
API to get_phys_addr().

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
target-arm: Implement TTBCR changes for LPAE

Implement the changes to the TTBCR register required for LPAE:
 * many fewer bits should be RAZ/WI
 * since TTBCR changes can result in a change of ASID, we must
   flush the TLB on writes to it

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
target-arm: Add support for long format translation table walks

Implement the actual table walk code for LPAE's long format
translation tables.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
event_notifier: add event_notifier_set

EventNotifier right now cannot be used as an inter-thread communication
primitive.  It only works if something else (the kernel) sets the eventfd.
Add a primitive to signal an EventNotifier that another thread is waiting
on.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
event_notifier: remove event_notifier_test

The function is useless (and unused).

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
event_notifier: add event_notifier_init_fd

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
ivshmem: use EventNotifier and memory API

All of ivshmem's usage of eventfd now has a corresponding API in
EventNotifier.  Simplify the code by using it, and also use the
memory API consistently to set up and tear down the ioeventfds.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
ivshmem: wrap ivshmem_del_eventfd loops with transaction

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
memory: pass EventNotifier, not eventfd

Under Win32, EventNotifiers will not have event_notifier_get_fd, so we
cannot call it in common code such as hw/virtio-pci.c.  Pass a pointer to
the notifier, and only retrieve the file descriptor in kvm-specific code.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
event_notifier: add event_notifier_set_handler

Win32 event notifiers are not file descriptors, so they will not be able
to use qemu_set_fd_handler.  But even if for now we only have a POSIX
version of EventNotifier, we can add a specific function that wraps
the call.

The wrapper passes the EventNotifier as the opaque value so that it will
be used with container_of.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
virtio: move common ioeventfd handling out of virtio-pci

All transports can use the same event handler for the ioeventfd, though
the exact setup (address/memory region) will be specific.

This lets virtio use event_notifier_set_handler.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
virtio: move common irqfd handling out of virtio-pci

All transports can use the same event handler for the irqfd, though the
exact mechanics of the assignment will be specific.  Note that there
are three states: handled by the kernel, handled in userspace, disabled.

This also lets virtio use event_notifier_set_handler.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
usb: add usb attached scsi emulation

$subject says all.  First cut.

It's a pure UAS (usb attached scsi) emulation, without BOT (bulk-only
transport) compatibility.  If your guest can't handle it use usb-storage
instead.

The emulation works like any other scsi hba emulation (eps, lsi, virtio,
megasas, ...).  It provides just the HBA where you can attach scsi
devices as you like using '-device'.  A single scsi target with up to
256 luns is supported.

For now only usb 2.0 transport is supported.  This will change in the
future though as I plan to use this as playground when codeing up &
testing usb 3.0 transport and streams support in the qemu usb core and
the xhci emulation.

No migration support yet.  I'm planning to add usb 3.0 support first as
this probably requires saving additional state.

Special thanks go to Paolo for bringing the qemu scsi emulation into
shape, so this can be added nicely without having to touch a single line
of scsi code.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
uhci: initialize expire_time when loading v1 vmstate

$subject says all: when loading old (v1) vmstate which doesn't contain
expire_time initialize it with a reasonable default (current time).

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
ehci: raise irq in the frame timer

With the async schedule being kicked from other places than the frame
timer (commit 0f588df8b3688b00e77aabaa32e26ece5f19bd39) it may happen
that we call ehci_commit_interrupt() more than once per frame.

Move the call from the async schedule handler to the frame timer to
restore old irq behavior, which is more correct.  Fixes regressions
with some linux kernel versions.

TODO: implement full Interrupt Threshold Control support.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
ehci: implement Interrupt Threshold Control support

Also reorganize and comment the irq functions while being at it.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
ehci: improve expire time calculation

Move down the expire time calculation down in the frame timer, to the
point where the timer is actually reloaded.  This way we'll notice any
async_stepdown changes (especially resetting to 0 due to usb activity).

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Add vgabios build rules to roms/Makefile

This patch adds some glue to roms/Makefile to build vgabios binaries for
qemu.  It covers both the lgpl'ed vgabios implementation used by qemu
traditionally and the new seabios implementation.

The purpose of this patch is to (a) document the vgabios build process
and (b) simplify seavgabios testing for those who want to play with it.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
megasas: mark mfi_frame_desc as 'static'

Suggested by blue swirl. Patch is on top of Paolo's
scsi-next tree.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Blue Swirl <blauwirbel@gmail.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>