Attached is a patch which extends vmxassist to handle two cases related to mode switching found while experimenting with different boot loaders. The first case is use of the JMP instruction with memory location operands to complete a switch to protected mode. This patch adds emulation for this form of the JMP instruction to vmxassist. The second case is where boot loader code does not save/restore a non-zero SS register across a protected mode traversal. Zeroing the SS register in vmxassist results in all sorts of problems in the domU after returning back to real mode. This patch stores segment register values before entering protected mode and correctly restores the old values (instead of an incorrect zero value) when reentering real mode. Signed-off-by Kevin Tronkowski <ktronkowski@virtualiron.com> Kevin _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel