From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756669AbXFOOw2 (ORCPT ); Fri, 15 Jun 2007 10:52:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755224AbXFOOtR (ORCPT ); Fri, 15 Jun 2007 10:49:17 -0400 Received: from gw.goop.org ([64.81.55.164]:34396 "EHLO mail.goop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754309AbXFOOtI (ORCPT ); Fri, 15 Jun 2007 10:49:08 -0400 Message-Id: <20070615005013.508938596@goop.org> References: <20070615004818.424726597@goop.org> User-Agent: quilt/0.46-1 Date: Thu, 14 Jun 2007 17:48:27 -0700 From: Jeremy Fitzhardinge To: "Eric W. Biederman" , "H. Peter Anvin" Cc: Vivek Goyal , Rusty Russell , Andi Kleen , v12n , lkml , Andrew Morton , Xen-Devel Subject: [PATCH 09/10] ask the hypervisor how much space it needs reserved Content-Disposition: inline; filename=xen-dynamic-topaddr.patch Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.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 @@ -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); --