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-rw-r--r--block/vpc.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/block/vpc.c b/block/vpc.c
index 79be7d051b..54633b65f2 100644
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -617,7 +617,11 @@ static int vpc_create(const char *filename, QEMUOptionParameter *options)
memcpy(dyndisk_header->magic, "cxsparse", 8);
- dyndisk_header->data_offset = be64_to_cpu(0xFFFFFFFF);
+ /*
+ * Note: The spec is actually wrong here for data_offset, it says
+ * 0xFFFFFFFF, but MS tools expect all 64 bits to be set.
+ */
+ dyndisk_header->data_offset = be64_to_cpu(0xFFFFFFFFFFFFFFFFULL);
dyndisk_header->table_offset = be64_to_cpu(3 * 512);
dyndisk_header->version = be32_to_cpu(0x00010000);
dyndisk_header->block_size = be32_to_cpu(block_size);