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exec: introduce address_space_extend_translation 

This extracts the common part of address_space_map and
address_space_cache_init into a new function.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-11-22 12:04:31 +01:00
parent 0ce265ffef
commit 715c31ec8e
1 changed files with 29 additions and 21 deletions
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50
exec.c
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@ -2938,6 +2938,31 @@ bool address_space_access_valid(AddressSpace *as, hwaddr addr, int len, bool is_
return true; return true;
} }
static hwaddr
address_space_extend_translation(AddressSpace *as, hwaddr addr, hwaddr target_len,
MemoryRegion *mr, hwaddr base, hwaddr len,
bool is_write)
{
hwaddr done = 0;
hwaddr xlat;
MemoryRegion *this_mr;
for (;;) {
target_len -= len;
addr += len;
done += len;
if (target_len == 0) {
return done;
}
len = target_len;
this_mr = address_space_translate(as, addr, &xlat, &len, is_write);
if (this_mr != mr || xlat != base + done) {
return done;
}
}
}
/* Map a physical memory region into a host virtual address. /* Map a physical memory region into a host virtual address.
* May map a subset of the requested range, given by and returned in *plen. * May map a subset of the requested range, given by and returned in *plen.
* May return NULL if resources needed to perform the mapping are exhausted. * May return NULL if resources needed to perform the mapping are exhausted.
@ -2951,9 +2976,8 @@ void *address_space_map(AddressSpace *as,
bool is_write) bool is_write)
{ {
hwaddr len = *plen; hwaddr len = *plen;
hwaddr done = 0; hwaddr l, xlat;
hwaddr l, xlat, base; MemoryRegion *mr;
MemoryRegion *mr, *this_mr;
void *ptr; void *ptr;
if (len == 0) { if (len == 0) {
@ -2987,26 +3011,10 @@ void *address_space_map(AddressSpace *as,
return bounce.buffer; return bounce.buffer;
} }
base = xlat;
for (;;) {
len -= l;
addr += l;
done += l;
if (len == 0) {
break;
}
l = len;
this_mr = address_space_translate(as, addr, &xlat, &l, is_write);
if (this_mr != mr || xlat != base + done) {
break;
}
}
memory_region_ref(mr); memory_region_ref(mr);
*plen = done; *plen = address_space_extend_translation(as, addr, len, mr, xlat, l, is_write);
ptr = qemu_ram_ptr_length(mr->ram_block, base, plen); ptr = qemu_ram_ptr_length(mr->ram_block, xlat, plen);
rcu_read_unlock(); rcu_read_unlock();
return ptr; return ptr;