From 7cb31b752c71e0bd405c1139e1907c3335877dff Mon Sep 17 00:00:00 2001 From: Stefano Stabellini Date: Thu, 27 Jan 2011 10:13:25 -0500 Subject: [PATCH] xen/e820: Guard against E820_RAM not having page-aligned size or start. Under Dell Inspiron 1525, and Intel SandyBridge SDP's the BIOS e820 RAM is not page-aligned: [ 0.000000] Xen: 0000000000100000 - 00000000df66d800 (usable) We were not handling that and ended up setting up a pagetable that included up to df66e000 with the disastrous effect that when memset(NODE_DATA(nodeid), 0, sizeof(pg_data_t)); tried to clear the page it would crash at the 2K mark. Initially reported by Michael Young @ http://lists.xensource.com/archives/html/xen-devel/2011-01/msg00108.html The fix is to page-align the size and also take into consideration the start of the E820 (in case that is not page-aligned either). This fixes the bootup failure on those affected machines. This patch is a rework of the Micheal A Young initial patch and considers the case if the start is not page-aligned. Reported-by: Michael A Young Signed-off-by: Konrad Rzeszutek Wilk Signed-off-by: Michael A Young --- Reading git-format-patch failed