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[Qemu-devel] [PATCH] Fix segfault with ram_size > 4095M without kvm

From: Ryan Harper
Subject: [Qemu-devel] [PATCH] Fix segfault with ram_size > 4095M without kvm
Date: Tue, 23 Feb 2010 09:13:14 -0600
User-agent: Mutt/1.5.6+20040907i

Currently, x86_64-softmmu qemu segfaults when trying to use > 4095M memsize.
This patch adds a simple check and error message (much like the 2047 limit on
32-bit hosts) on ram_size in the control path after we determine we're
not using kvm

Upstream qemu-kvm is affected if using the -no-kvm option; this patch address
the segfault there as well.

Signed-off-by: Ryan Harper <address@hidden>
 vl.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/vl.c b/vl.c
index db7a178..a659e98 100644
--- a/vl.c
+++ b/vl.c
@@ -5760,6 +5760,12 @@ int main(int argc, char **argv, char **envp)
             fprintf(stderr, "failed to initialize KVM\n");
+    } else {
+        /* without kvm enabled, we can only support 4095 MB RAM */
+        if (ram_size > (4095UL << 20)) {
+            fprintf(stderr, "qemu: without kvm support at most 4095 MB RAM can 
be simulated\n");
+            exit(1);
+        }
     if (qemu_init_main_loop()) {

Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx

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