[Xen-devel] [PATCH 09/10] ask the hypervisor how much space it needs reserved

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

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@xxxxxxxxxxxxx>

---
 arch/i386/xen/enlighten.c |   13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

===================================================================
--- a/arch/i386/xen/enlighten.c
+++ b/arch/i386/xen/enlighten.c
@@ -1113,6 +1113,17 @@ static void setup_hypercall_page(void)
        native_write_msr(ebx + 0, ((u64)hypercall_mfn) << PAGE_SHIFT);
 }
 
+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)
 {
@@ -1163,7 +1174,7 @@ 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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