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 <ry...@us.ibm.com> Signed-off-by: Aurelien Jarno <aurel...@aurel32.net> --- NOTE: this patch was applied in the v0.12.x branch, but it seems it got lost for master vl.c | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-) diff --git a/vl.c b/vl.c index 2dbb6db..bb9c21c 100644 --- a/vl.c +++ b/vl.c @@ -5792,6 +5792,12 @@ int main(int argc, char **argv, char **envp) fprintf(stderr, "failed to initialize KVM\n"); exit(1); } + } 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()) { -- 1.7.3.3.402.ga48aa