formatdomain.html.in: mention pSeries NVDIMM 'align down' mechanic

The reason why we align down the guest area (total-size - label-size) is
explained in the body of qemuDomainNVDimmAlignSizePseries(). This
behavior must also be documented in the user docs.

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>

diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index f5ee97de8163494af7eea22eb8dfa4ce9db201dc..f3a639b9729fdca6614849cf63ab38cf9308cabd 100644 (file)
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -9412,8 +9412,10 @@ qemu-kvm -net nic,model=? /dev/null
             </p>
             <ol>
               <li>the minimum label size is 128KiB,</li>
-              <li>the remaining size (total-size - label-size) will be aligned
-                to 4KiB as default.</li>
+              <li>the remaining size (total-size - label-size), also called guest
+                area, will be aligned to 4KiB as default. For pSeries guests, the
+                guest area will be aligned down to 256MiB, and the minimum size
+                of the guest area must be at least 256MiB.</li>
             </ol>
           </dd>