From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeremy Fitzhardinge Subject: [PATCH 8/9] ask the hypervisor how much space it needs reserved Date: Wed, 20 Jun 2007 16:17:34 -0700 Message-ID: <20070620231853.295485100@goop.org> References: <20070620231726.834538992@goop.org> Return-path: Content-Disposition: inline; filename=xen-dynamic-topaddr.patch List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org To: "Eric W. Biederman" , "H. Peter Anvin" Cc: lkml , Vivek Goyal , Andrew Morton , v12n List-Id: virtualization@lists.linuxfoundation.org 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 --- 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); --