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exec: do not clamp accesses to MMIO regions

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It is common for MMIO registers to overlap, for example a 4 byte register
at 0xcf8 (totally random choice... :)) and a 1 byte register at 0xcf9.
If these registers are implemented via separate MemoryRegions, it is
wrong to clamp the accesses as the value written would be truncated.

Hence for these regions the effects of commit 23820db (exec: Respect
as_translate_internal length clamp, 2015-03-16, previously applied as
commit c3c1bb9) must be skipped.

Backports commit 965eb2fcdfe919ecced6c34803535ad32dc1249c from qemu
This commit is contained in:
Paolo Bonzini 2018-02-18 17:50:06 -05:00 committed by Lioncash
parent b82e711a65
commit 26ba2e91f6
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 6 additions and 2 deletions
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8
qemu/exec.c
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@ -312,6 +312,7 @@ address_space_translate_internal(AddressSpaceDispatch *d, hwaddr addr, hwaddr *x
hwaddr *plen, bool resolve_subpage)
{
MemoryRegionSection *section;
MemoryRegion *mr;
Int128 diff;
section = address_space_lookup_region(d, addr, resolve_subpage);
@ -321,8 +322,11 @@ address_space_translate_internal(AddressSpaceDispatch *d, hwaddr addr, hwaddr *x
/* Compute offset within MemoryRegion */
*xlat = addr + section->offset_within_region;
diff = int128_sub(section->mr->size, int128_make64(addr));
*plen = int128_get64(int128_min(diff, int128_make64(*plen)));
mr = section->mr;
if (memory_region_is_ram(mr)) {
diff = int128_sub(mr->size, int128_make64(addr));
*plen = int128_get64(int128_min(diff, int128_make64(*plen)));
}
return section;
}