Zulauf, John
2007-Dec-01 00:50 UTC
[Xen-devel] [PATCH][RFC] Gdbserver-xen support for HVM Guests... getting further.
All, below is a minimal patch that allows me to attach, stepi, x, disassemble, break with a 64bit HVM guest (2MB pages). The RFC is for the 1st fix below, also, others testing/experience trying this patch would be welcome. 1st fix: Diasable the gpfn to mfn mapping of to_ma. This seems to be the right thing to do (at least as the map_domain_va_* functions are using it), as xc_map_foreign_range takes gpfn''s for HVM domains. Yet, the comments in the file indicate that the mapping in to_ma is important and specifically so for page tables. Using a small HVM domain with known page tables, I can verify that the correct pages are *only* loaded with the to_ma mapping disabled. Can anyone explain? Is there some *other* conditional case in which this would be correct? 2nd fix: 2M page calculation -- this is a simple misplacement of parentheses that was causing the page directory entry to be shifted left 12. Testing -- able to attach to 64bit HVM domains and info registers, stepi, break, disassemble, x etc. Issues Remaining cannot ^C to stop a domain (wait for domain never returns) must explicitly "set architecture i386:x86_64" in the gdb session to connect to 64 bit remote targets attempting to print variable contents or addresses "n" through hvmloader (built -g) resulted in gdb error messages: dwarf2_read_address: Corrupted DWARF expression Patch Signed-off by John Zulauf john.zulauf@intel.com _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel