Ian Pratt
2005-Apr-19 22:46 UTC
RE: [Xen-devel] Are linear page tables and writable page tablesincompatible?
> At the start of day I enable writable page tables - and they > work, but only when accessed through a separate mapping. > FreeBSD''s i386 pmap treats the page tables as an array that > is mapped right after userspace. Can writable page tables be > made to work in this context?Interesting point, I don''t think anyone''s ever thought about this before. You''d need to maintain a copy of each L2 in which all the entries are read only, and have the linear pt map slot point at that: Xen needs to be able to selectively write enable the entries in writable page table mode. Ian _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel