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memory: Change MemoryRegion priorities from unsigned to signed

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When memory regions overlap, priority can be used to specify
which of them takes priority. By making the priority values signed
rather than unsigned, we make it more convenient to implement
a situation where one "background" region should appear only
where no other region exists: rather than having to explicitly
specify a high priority for all the other regions, we can let them take
the default (zero) priority and specify a negative priority for the
background region.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Marcel Apfelbaum <marcel.a@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Marcel Apfelbaum 2013-09-16 11:21:14 +03:00 • committed by Michael S. Tsirkin
parent e26d3e7346
commit a1ff8ae066
4 changed files with 7 additions and 7 deletions
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4
include/exec/memory.h
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@ -153,7 +153,7 @@ struct MemoryRegion {
bool flush_coalesced_mmio;
MemoryRegion *alias;
hwaddr alias_offset;
unsigned priority;
int priority;
bool may_overlap;
QTAILQ_HEAD(subregions, MemoryRegion) subregions;
QTAILQ_ENTRY(MemoryRegion) subregions_link;
@ -779,7 +779,7 @@ void memory_region_add_subregion(MemoryRegion *mr,
void memory_region_add_subregion_overlap(MemoryRegion *mr,
hwaddr offset,
MemoryRegion *subregion,
unsigned priority);
int priority);
/**
* memory_region_get_ram_addr: Get the ram address associated with a memory