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xen-devel
[Xen-devel] [PATCH 09/10] ask the hypervisor how much space it needs res
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To: |
"Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx> |
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Subject: |
[Xen-devel] [PATCH 09/10] ask the hypervisor how much space it needs reserved |
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From: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Date: |
Thu, 14 Jun 2007 17:48:27 -0700 |
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Cc: |
Xen-Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Rusty Russell <rusty@xxxxxxxxxxxxxxx>, lkml <linux-kernel@xxxxxxxxxxxxxxx>, Andi Kleen <ak@xxxxxxx>, Vivek Goyal <vgoyal@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, v12n <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx> |
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Fri, 15 Jun 2007 07:50:38 -0700 |
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quilt/0.46-1 |
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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