Re: [libvirt] [Qemu-devel] [PATCH v2 3/3] raw-posix: Re-open host CD-ROM after media change

On (Tue) 05 Apr 2011 [10:48:16], Avi Kivity wrote: We're still discussing where the fix should be, but it certainly is a kernel bug and should be fixed there, and then applied to stable. However, there are other bugs in qemu which will prevent the right size changes to be visible in the guest (the RFC series I sent out earlier in this thread need to be applied to QEMU at the least, the series has grown in my development tree since the time I sent that one out). So essentially we need to update both, the hypervisor and the guest to get proper CDROM media change support. It also looks like we can't have a workaround in QEMU to get older guests to work. However, a hack in the kernel can be used without any QEMU changes (revalidate disk on each sr_open() call, irrespective of detecting any media change). I'm against doing that for upstream, but downstreams could do that for new guest - old hypervisor compat. Amit