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memory: Helpers to copy/free a MemoryRegionSection 

In case one wants to create a permanent copy of a MemoryRegionSections,
one needs access to flatview_ref()/flatview_unref(). Instead of exposing
these, let's just add helpers to copy/free a MemoryRegionSection and
properly adjust references.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Auger Eric <eric.auger@redhat.com>
Cc: Wei Yang <richard.weiyang@linux.alibaba.com>
Cc: teawater <teawaterz@linux.alibaba.com>
Cc: Marek Kedzierski <mkedzier@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20210413095531.25603-3-david@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
master
David Hildenbrand 2021-04-13 11:55:20 +02:00 committed by Eduardo Habkost
parent 8947d7fc4e
commit 228438384e
2 changed files with 47 additions and 0 deletions
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20
include/exec/memory.h
View File

@ -1066,6 +1066,26 @@ static inline bool MemoryRegionSection_eq(MemoryRegionSection *a,
a->nonvolatile == b->nonvolatile;
}
/**
* memory_region_section_new_copy: Copy a memory region section
*
* Allocate memory for a new copy, copy the memory region section, and
* properly take a reference on all relevant members.
*
* @s: the #MemoryRegionSection to copy
*/
MemoryRegionSection *memory_region_section_new_copy(MemoryRegionSection *s);
/**
* memory_region_section_new_copy: Free a copied memory region section
*
* Free a copy of a memory section created via memory_region_section_new_copy().
* properly dropping references on all relevant members.
*
* @s: the #MemoryRegionSection to copy
*/
void memory_region_section_free_copy(MemoryRegionSection *s);
/**
* memory_region_init: Initialize a memory region
*

27
softmmu/memory.c
View File

@ -2701,6 +2701,33 @@ MemoryRegionSection memory_region_find(MemoryRegion *mr,
return ret;
}
MemoryRegionSection *memory_region_section_new_copy(MemoryRegionSection *s)
{
MemoryRegionSection *tmp = g_new(MemoryRegionSection, 1);
*tmp = *s;
if (tmp->mr) {
memory_region_ref(tmp->mr);
}
if (tmp->fv) {
bool ret = flatview_ref(tmp->fv);
g_assert(ret);
}
return tmp;
}
void memory_region_section_free_copy(MemoryRegionSection *s)
{
if (s->fv) {
flatview_unref(s->fv);
}
if (s->mr) {
memory_region_unref(s->mr);
}
g_free(s);
}
bool memory_region_present(MemoryRegion *container, hwaddr addr)
{
MemoryRegion *mr;