diff options
| author | Alexander Duyck <alexander.h.duyck@linux.intel.com> | 2020-04-09 20:41:50 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-04-13 02:56:18 -0400 |
| commit | d489ae4ac57ebe14bde8384556cbac237ead988d (patch) | |
| tree | 13decef18302ed6153b05ba5974918cd61dbc48b | |
| parent | 1148e4f4dc22f8efe3419fda4ca4f0a7369ef94a (diff) | |
memory: Do not allow direct write access to rom_device regions
According to the documentation in memory.h a ROM memory region will be
backed by RAM for reads, but is supposed to go through a callback for
writes. Currently we were not checking for the existence of the rom_device
flag when determining if we could perform a direct write or not.
To correct that add a check to memory_region_is_direct so that if the
memory region has the rom_device flag set we will return false for all
checks where is_write is set.
Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Message-Id: <20200410034150.24738.98143.stgit@localhost.localdomain>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | include/exec/memory.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/exec/memory.h b/include/exec/memory.h index 1614d9a02c..e000bd2f97 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -2351,8 +2351,8 @@ void address_space_write_cached_slow(MemoryRegionCache *cache, static inline bool memory_access_is_direct(MemoryRegion *mr, bool is_write) { if (is_write) { - return memory_region_is_ram(mr) && - !mr->readonly && !memory_region_is_ram_device(mr); + return memory_region_is_ram(mr) && !mr->readonly && + !mr->rom_device && !memory_region_is_ram_device(mr); } else { return (memory_region_is_ram(mr) && !memory_region_is_ram_device(mr)) || memory_region_is_romd(mr); |