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Subject[PATCH 09/12] xen: ask the hypervisor how much space it needs reserved
Ask the hypervisor how much space it needs reserved, since 32-on-64
doesn't need any space, and it may change in future.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>

---
arch/x86/xen/enlighten.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
===================================================================
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1085,6 +1085,17 @@ static const struct machine_ops __initda
};


+static void __init xen_reserve_top(void)
+{
+ unsigned long top = HYPERVISOR_VIRT_START;
+ struct xen_platform_parameters pp;
+
+ if (HYPERVISOR_xen_version(XENVER_platform_parameters, &pp) == 0)
+ top = pp.virt_start;
+
+ reserve_top_address(-top + 2 * PAGE_SIZE);
+}
+
/* First C function to be called on Xen boot */
asmlinkage void __init xen_start_kernel(void)
{
@@ -1134,7 +1145,7 @@ asmlinkage void __init xen_start_kernel(
paravirt_ops.kernel_rpl = 0;

/* set the limit of our address space */
- reserve_top_address(-HYPERVISOR_VIRT_START + 2 * PAGE_SIZE);
+ xen_reserve_top();

/* set up basic CPUID stuff */
cpu_detect(&new_cpu_data);
--

-
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