On Fri, 31 May 2013 16:52:18 +0800
Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx> wrote:
> Luiz Capitulino reported that guest refused to boot and qemu
> complained with:
> kvm_set_phys_mem: error unregistering overlapping slot: Invalid argument
>
> It is caused by commit 235e8982ad that did double free for the memslot
> so that the second one raises the -EINVAL error
>
> Fix it by reset memory size only if it is needed
>
> Reported-by: Luiz Capitulino <lcapitulino@xxxxxxxxxx>
> Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx>
Tested-by: Luiz Capitulino <lcapitulino@xxxxxxxxxx>
Thanks Xiao for the fix, and thanks everyone for debugging this issue!
> ---
> kvm-all.c | 3 ++-
> 1 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/kvm-all.c b/kvm-all.c
> index 8e7bbf8..405480e 100644
> --- a/kvm-all.c
> +++ b/kvm-all.c
> @@ -206,7 +206,8 @@ static int kvm_set_user_memory_region(KVMState *s, KVMSlot *slot)
> if (s->migration_log) {
> mem.flags |= KVM_MEM_LOG_DIRTY_PAGES;
> }
> - if (mem.flags & KVM_MEM_READONLY) {
> +
> + if (slot->memory_size && mem.flags & KVM_MEM_READONLY) {
> /* Set the slot size to 0 before setting the slot to the desired
> * value. This is needed based on KVM commit 75d61fbc. */
> mem.memory_size = 0;
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