docs/nvdimm: add description of alignment requirement of device dax

For device dax (e.g., /dev/dax0.0), the NUM of 'align=NUM' option
needs to match the alignment requirement of the device dax.
It must be larger than or equal to the 'align' of device dax.

Reviewed-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: Jingqi Liu <jingqi.liu@intel.com>
Message-Id: <20200429085011.63752-3-jingqi.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/exec.c b/exec.c
index c5ab59ec44..21926dc9c7 100644
--- a/exec.c
+++ b/exec.c
@@ -2379,7 +2379,7 @@ RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr,
     file_align = get_file_align(fd);
     if (file_align > 0 && mr && file_align > mr->align) {
         error_setg(errp, "backing store align 0x%" PRIx64
-                   " is larger than 'align' option 0x" PRIx64,
+                   " is larger than 'align' option 0x%" PRIx64,
                    file_align, mr->align);
         return NULL;
     }