From 060e7f67c88ebbcf8745505c7ccf44c53601f7de Mon Sep 17 00:00:00 2001 From: Boris Ostrovsky Date: Wed, 9 Jul 2014 13:18:18 -0400 Subject: [PATCH] x86/espfix/xen: Fix allocation of pages for paravirt page tables commit 8762e5092828c4dc0f49da5a47a644c670df77f3 upstream. init_espfix_ap() is currently off by one level when informing hypervisor that allocated pages will be used for ministacks' page tables. The most immediate effect of this on a PV guest is that if 'stack_page = __get_free_page()' returns a non-zeroed-out page the hypervisor will refuse to use it for a page table (which it shouldn't be anyway). This will result in warnings by both Xen and Linux. More importantly, a subsequent write to that page (again, by a PV guest) is likely to result in fatal page fault. Signed-off-by: Boris Ostrovsky Link: http://lkml.kernel.org/r/1404926298-5565-1-git-send-email-boris.ostrovsky@oracle.com Reviewed-by: Konrad Rzeszutek Wilk Signed-off-by: H. Peter Anvin Signed-off-by: Greg Kroah-Hartman Signed-off-by: Ben Hutchings --- Reading git-format-patch failed