int128: optimize and add test cases

For add, the carry only requires checking one of the arguments.
For sub and neg, we can similarly optimize computation of the
carry.

For ge, we can just do lexicographic order.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
scsi: keep device alive while it has requests

Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
dma: keep a device alive while it has SGLists

Reviewed-by: Anthony Liguori <aliguori@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
adlib: replace register_ioport*

Convert over to memory regions to obsolete register_ioport*.

CC: malc <av1474@comtv.ru>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
applesmc: replace register_ioport*

Convert over to memory regions to obsolete register_ioport*.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
wdt_ib700: replace register_ioport*

Convert over to memory regions to obsolete register_ioport*.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
i82374: replace register_ioport*

Convert over to memory regions to obsolete register_ioport*.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
prep: replace register_ioport*

Convert over to memory regions to obsolete register_ioport*.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
vt82c686: replace register_ioport*

Convert over to memory regions to obsolete register_ioport*.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Privatize register_ioport_read/write

No more users outside of ioport.c.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
isa: implement isa_is_ioport_assigned via memory_region_find

Open-code isa_is_ioport_assigned via a memory region lookup. As all IO
ports are now directly or indirectly registered via the memory API, this
becomes possible and will finally allow us to drop the ioport tables.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
vmware-vga: Accept unaligned I/O accesses

Before switching to the memory core dispatcher, we need to make sure
that this pv-device will continue to receive unaligned portio accesses.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
xen: Mark fixed platform I/O as unaligned

Before switching to the memory core dispatcher, we need to make sure
that this pv-device will continue to receive unaligned portio accesses.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
ioport: Switch dispatching to memory core layer

The current ioport dispatcher is a complex beast, mostly due to the
need to deal with old portio interface users. But we can overcome it
without converting all portio users by embedding the required base
address of a MemoryRegionPortio access into that data structure. That
removes the need to have the additional MemoryRegionIORange structure
in the loop on every access.

To handle old portio memory ops, we simply install dispatching handlers
for portio memory regions when registering them with the memory core.
This removes the need for the old_portio field.

We can drop the additional aliasing of ioport regions and also the
special address space listener. cpu_in and cpu_out now simply call
address_space_read/write. And we can concentrate portio handling in a
single source file.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
ioport: Remove unused old dispatching services

Remove unused ioport_register and isa_unassign_ioport along with
everything that only those services used.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
vmport: Disentangle read handler type from portio

In case the latter may vanish one day, make sure the vmport read handler
type will remain unaffected. This is also conceptually cleaner.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
ioport: Move portio types to ioport.h

This decouples memory.h from ioport.h, concentrating all portio related
types in a single header.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
memory: add owner argument to initialization functions

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
memory: destroy phys_sections one by one

phys_sections_clear is invoked after the dispatch tree has been
destroyed.  This leaves a window where phys_sections_nb > 0 but the
subpages are not valid anymore, which is a recipe for use-after-free
bugs.

Move the destruction of subpages in phys_sections_clear.  We will
still destroy the subpages when an address space is cleaned up,
because address_space_destroy will clear as->root and commit the
change before it calls address_space_destroy_dispatch.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
exec: simplify destruction of the phys map

Do not bother visiting the radix tree when an address space is destroyed.
After the previous patch, this has become a pointless exercise.  When
called from address_space_destroy_dispatch, all you're doing is zeroing
out a structure that will be freed as soon as you come back.  When called
from mem_begin, when phys_page_set_level will call phys_map_node_alloc the
radix tree's array will be zeroed too.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>