tree 301ee8a4609481df7cd5e19620c2a87213bbd184
parent 7721c7f7c272fd2ed9d58500b7e99c33ab8a1af1
author Paolo Bonzini <pbonzini@redhat.com> 1369138133 +0200
committer Paolo Bonzini <pbonzini@redhat.com> 1371552183 +0200

scsi-generic: fix sign extension of READ CAPACITY(10) data

Issuing the READ CAPACITY(10) command in the guest will cause QEMU
to update its knowledge of the maximum accessible LBA in the disk.
The recorded maximum LBA will be wrong if the disk is bigger than
1TB, because ldl_be_p returns a signed int.

When this is fixed, a latent bug will be unmasked.  If the READ
CAPACITY(10) command reported an overflow (0xFFFFFFFF), we must
not overwrite the previously-known maximum accessible LBA, or the guest
will fail to access the disk above the first 2TB.

Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>