From 0fd67818527881ce8ec6ee9c3952386c166f91ad Mon Sep 17 00:00:00 2001
From: Markus Armbruster <armbru@redhat.com>
Date: Mon, 7 Jul 2014 10:28:38 +0200
Subject: vl: Round memory sizes below 2MiB up to 2MiB

RH-Author: Markus Armbruster <armbru@redhat.com>
Message-id: <1387459965-19517-2-git-send-email-armbru@redhat.com>
Patchwork-id: 56389
O-Subject: [PATCH 7.0 qemu-kvm 1/1] vl: Round memory sizes below 2MiB up to 2MiB
Bugzilla: 999836
RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
RH-Acked-by: Luiz Capitulino <lcapitulino@redhat.com>
RH-Acked-by: Igor Mammedov <imammedo@redhat.com>

From: Markus Armbruster <armbru@redhat.com>

SeaBIOS requires at least 1MiB of RAM, but doesn't doesn't check for
it.  It simply assumes it's there, and crashes when it isn't, often
without any indication what's wrong.  No upstream SeaBIOS fix
expected.

In RHEL-6, we round memory sizes below 2MiB up to 2MiB to protect
SeaBIOS (commit 551c098 and commit b9d6c40).  Do the same for RHEL-7.
Not wanted upstream.

Signed-off-by: Markus Armbruster <armbru@redhat.com>

diff --git a/vl.c b/vl.c
index 29c9373..30631ac 100644
--- a/vl.c
+++ b/vl.c
@@ -2689,6 +2689,7 @@ static void set_memory_options(uint64_t *ram_slots, ram_addr_t *maxram_size)
     }
 
     sz = QEMU_ALIGN_UP(sz, 8192);
+    sz = MAX(sz, 2 * 1024 * 1024);
     ram_size = sz;
     if (ram_size != sz) {
         error_report("ram size too large");