On Sat, Oct 14, 2017 at 01:19:08PM -0400, Brian Gerst wrote: > From what we've seen with the TLB flush rework, having potential > garbage in the page tables that speculative reads can see can cause > bad things like machine checks. It would be best to have a second > temporary page just for the page table (and properly cleared). Hm. Interesting. Is there a place where I can read more about this? > The trampoline also needs its own stack, in case the stack pointer was > above 4G. You are right, we need new stack. I've missed that. > That could be at the end of the code page, since you only need 8 bytes. When I wrote about 8 bytes, I referred the usage of page table, not code. We use more than 8 bytes of code, but this should enough in the page. -- Kirill A. Shutemov -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
