Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932411AbbFHMJa (ORCPT ); Mon, 8 Jun 2015 08:09:30 -0400 Received: from cantor2.suse.de ([195.135.220.15]:43113 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752176AbbFHMHF (ORCPT ); Mon, 8 Jun 2015 08:07:05 -0400 From: Juergen Gross To: xen-devel@lists.xensource.com, konrad.wilk@oracle.com, david.vrabel@citrix.com, boris.ostrovsky@oracle.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Juergen Gross Subject: [Patch V4 09/16] xen: check for kernel memory conflicting with memory layout Date: Mon, 8 Jun 2015 14:06:50 +0200 Message-Id: <1433765217-16333-10-git-send-email-jgross@suse.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1433765217-16333-1-git-send-email-jgross@suse.com> References: <1433765217-16333-1-git-send-email-jgross@suse.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1608 Lines: 49 Checks whether the pre-allocated memory of the loaded kernel is in conflict with the target memory map. If this is the case, just panic instead of run into problems later, as there is nothing we can do to repair this situation. Signed-off-by: Juergen Gross Reviewed-by: David Vrabel --- arch/x86/xen/setup.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c index 973d294..9bd3f35 100644 --- a/arch/x86/xen/setup.c +++ b/arch/x86/xen/setup.c @@ -27,6 +27,7 @@ #include #include #include +#include #include "xen-ops.h" #include "vdso.h" #include "p2m.h" @@ -790,6 +791,17 @@ char * __init xen_memory_setup(void) sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); + /* + * Check whether the kernel itself conflicts with the target E820 map. + * Failing now is better than running into weird problems later due + * to relocating (and even reusing) pages with kernel text or data. + */ + if (xen_is_e820_reserved(__pa_symbol(_text), + __pa_symbol(__bss_stop) - __pa_symbol(_text))) { + xen_raw_console_write("Xen hypervisor allocated kernel memory conflicts with E820 map\n"); + BUG(); + } + xen_reserve_xen_mfnlist(); /* -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/