linux-kernel - [PATCH 09/13] xen: check for kernel memory conflicting with memory layout

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Date:	Wed, 18 Feb 2015 07:52:02 +0100
From:	Juergen Gross <jgross@...e.com>
To:	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	konrad.wilk@...cle.com, david.vrabel@...rix.com,
	boris.ostrovsky@...cle.com
Cc:	Juergen Gross <jgross@...e.com>
Subject: [PATCH 09/13] xen: check for kernel memory conflicting with memory layout

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.

Signed-off-by: Juergen Gross <jgross@...e.com>
---
 arch/x86/xen/setup.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index eb219c1..37a34f9 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -829,6 +829,12 @@ static void __init xen_reserve_xen_mfnlist(void)
 			 PFN_PHYS(xen_start_info->nr_p2m_frames));
 }
 
+static int __init xen_kernel_mem_conflict(phys_addr_t start, phys_addr_t size)
+{
+	panic("kernel is located at position conflicting with E820 map!\n");
+	return 0;
+}
+
 /**
  * machine_specific_memory_setup - Hook for machine specific memory setup.
  **/
@@ -843,6 +849,10 @@ char * __init xen_memory_setup(void)
 	int i;
 	int op;
 
+	xen_add_reserved_area(__pa_symbol(_text),
+			      __pa_symbol(__bss_stop) - __pa_symbol(_text),
+			      xen_kernel_mem_conflict, 0);
+
 	xen_reserve_xen_mfnlist();
 
 	xen_max_pfn = min(MAX_DOMAIN_PAGES, xen_start_info->nr_pages);
-- 
2.1.4

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