Itsuro ODA
2009-Jul-13 04:01 UTC
[Xen-devel] [PATCH] fix missing Crash note in /proc/iomem
Hi,
Missing "Crash note" in /proc/iomem (dom 0) happens on the Xen 3.4.*.
This causes a crash dump cannot be analyzed normally.
This patch fixes this problem.
This patch is for linux-2.6.18-xen.hg.
The range of "Crash note" is within the "Hypervisor code and
data"
on the Xen 3.3.* and before. The code assumed this.
It is not true for the Xen 3.4.
== example: before patch: one of two "Crash note" is missing
# cat /proc/iomem
...
00100000-c779ffff : System RAM
02000000-09ffffff : Crash kernel
c7300000-c74aa35f : Hypervisor code and data
c7456080-c7456213 : Crash note
c77a0000-c77adfff : ACPI Tables
...
== example: after patch: two "Crash note" are showed normally
# cat /proc/iomem
...
00100000-c779ffff : System RAM
02000000-09ffffff : Crash kernel
c7300000-c74aa35f : Hypervisor code and data
c7456080-c7456213 : Crash note
c7791c00-c7791df3 : Crash note
c77a0000-c77adfff : ACPI Tables
...
This problem is occured on the x86_64 only. This patch has no bad effect for
other architectures and is backword compatible.
Please apply this patch to the newer dom-0 kernel too.
Thanks.
Itsuro Oda
---
Signed-off-by: Itsuro Oda <oda@valinux.co.jp>
diff -r b086278a4406 drivers/xen/core/machine_kexec.c
--- a/drivers/xen/core/machine_kexec.c Mon Jun 29 10:57:46 2009 +0100
+++ b/drivers/xen/core/machine_kexec.c Fri Jul 10 16:57:34 2009 +0900
@@ -144,7 +144,15 @@ void __init xen_machine_kexec_setup_reso
void __init xen_machine_kexec_register_resources(struct resource *res)
{
+ int k;
+ struct resource *r;
+
request_resource(res, &xen_hypervisor_res);
+ for (k = 0; k < xen_max_nr_phys_cpus; k++) {
+ r = xen_phys_cpus + k;
+ if (r->parent == NULL) /* out of xen_hypervisor_res range */
+ request_resource(res, r);
+ }
machine_kexec_register_resources(res);
}
--
Itsuro ODA <oda@valinux.co.jp>
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