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| author | Alexander Graf <graf@amazon.com> | 2023-04-03 22:14:21 +0000 |
|---|---|---|
| committer | David Hildenbrand <david@redhat.com> | 2023-05-23 16:47:03 +0200 |
| commit | 4b870dc4d0c0895859d34d14ce0272a4bcbccf78 (patch) | |
| tree | 8af35d1db6ba0cd63419627870a0a75aec9bf150 /softmmu/memory.c | |
| parent | 886c0453cbf10eebd42a9ccf89c3e46eb389c357 (diff) | |
| download | qemu-4b870dc4d0c0895859d34d14ce0272a4bcbccf78.zip qemu-4b870dc4d0c0895859d34d14ce0272a4bcbccf78.tar.gz qemu-4b870dc4d0c0895859d34d14ce0272a4bcbccf78.tar.bz2 | |
hostmem-file: add offset option
Add an option for hostmem-file to start the memory object at an offset
into the target file. This is useful if multiple memory objects reside
inside the same target file, such as a device node.
In particular, it's useful to map guest memory directly into /dev/mem
for experimentation.
To make this work consistently, also fix up all places in QEMU that
expect fd offsets to be 0.
Signed-off-by: Alexander Graf <graf@amazon.com>
Message-Id: <20230403221421.60877-1-graf@amazon.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Acked-by: Peter Xu <peterx@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Diffstat (limited to 'softmmu/memory.c')
| -rw-r--r-- | softmmu/memory.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/softmmu/memory.c b/softmmu/memory.c index 9ee4131..7d9494c 100644 --- a/softmmu/memory.c +++ b/softmmu/memory.c @@ -1619,6 +1619,7 @@ void memory_region_init_ram_from_file(MemoryRegion *mr, uint64_t align, uint32_t ram_flags, const char *path, + ram_addr_t offset, bool readonly, Error **errp) { @@ -1630,7 +1631,7 @@ void memory_region_init_ram_from_file(MemoryRegion *mr, mr->destructor = memory_region_destructor_ram; mr->align = align; mr->ram_block = qemu_ram_alloc_from_file(size, mr, ram_flags, path, - readonly, &err); + offset, readonly, &err); if (err) { mr->size = int128_zero(); object_unparent(OBJECT(mr)); |