Messages in this thread Patch in this message | | | From | Juergen Gross <> | Subject | [RESEND Patch V3 09/15] xen: check for kernel memory conflicting with memory layout | Date | Mon, 4 May 2015 10:23:09 +0200 |
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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 <jgross@suse.com> Reviewed-by: David Vrabel <david.vrabel@citrix.com> --- 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 <xen/interface/memory.h> #include <xen/interface/physdev.h> #include <xen/features.h> +#include <xen/hvc-console.h> #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
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