Anthony Liguori wrote: > I've been playing around with these patches. If I do an > madvise(MADV_DONTNEED) in userspace, when I close the VM, I get the > following bug. My knowledge of the mm is limited but since > madvise(MADV_DONTNEED) effectively does a zap_page_range() I wonder if > we're lacking the necessary callback to also remove any potential GPA > covered by that range from shadow page cache. > > Regards, > > Anthony Liguori > > [ 860.724555] rmap_remove: ffff81004c48cf00 506d1025 0->BUG >
The mmu should keep a page's refcount elevated while it's mapped in, so MADV_DONTNEED should not affect it. Looks like there is a bug where kvm looks at the host pagetables for a page which is already in the shadow pagetables. We need to avoid this as long as we don't have pte notifiers. -- Do not meddle in the internals of kernels, for they are subtle and quick to panic. ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
