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

Jeremy Fitzhardinge
2007-06-15T14:52:28Z

[-- Attachment #1: xen-dynamic-topaddr.patch --]
[-- Type: text/plain, Size: 1213 bytes --]

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/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);

--