[PATCH 07/10] xen: ask the hypervisor how much space it needs reserved
From: Jeremy Fitzhardinge <hidden>
Date: 2007-10-12 21:47:56
Also in:
lkml, xen-devel
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 <redacted> --- 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@@ -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);
--