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From 29e44e4e1f10ac7d2f9ac824b928518f3a2ccc10 Mon Sep 17 00:00:00 2001
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From: Markus Armbruster <armbru@redhat.com>
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Date: Mon, 7 Jul 2014 10:28:38 +0200
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Subject: vl: Round memory sizes below 2MiB up to 2MiB
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RH-Author: Markus Armbruster <armbru@redhat.com>
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Message-id: <1387459965-19517-2-git-send-email-armbru@redhat.com>
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Patchwork-id: 56389
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O-Subject: [PATCH 7.0 qemu-kvm 1/1] vl: Round memory sizes below 2MiB up to 2MiB
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Bugzilla: 999836
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Acked-by: Luiz Capitulino <lcapitulino@redhat.com>
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RH-Acked-by: Igor Mammedov <imammedo@redhat.com>
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From: Markus Armbruster <armbru@redhat.com>
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SeaBIOS requires at least 1MiB of RAM, but doesn't doesn't check for
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it. It simply assumes it's there, and crashes when it isn't, often
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without any indication what's wrong. No upstream SeaBIOS fix
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expected.
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In RHEL-6, we round memory sizes below 2MiB up to 2MiB to protect
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SeaBIOS (commit 551c098 and commit b9d6c40). Do the same for RHEL-7.
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Not wanted upstream.
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Signed-off-by: Markus Armbruster <armbru@redhat.com>
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(cherry picked from commit 5c401c750c8e52fe5c67b4e60143a862a0d584c1)
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---
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vl.c | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/vl.c b/vl.c
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index ff4e7f7..59f515c 100644
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--- a/vl.c
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+++ b/vl.c
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@@ -2906,6 +2906,7 @@ static void set_memory_options(uint64_t *ram_slots, ram_addr_t *maxram_size,
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}
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sz = QEMU_ALIGN_UP(sz, 8192);
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+ sz = MAX(sz, 2 * 1024 * 1024);
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ram_size = sz;
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if (ram_size != sz) {
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error_report("ram size too large");
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--
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1.8.3.1
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