Re: [Xen-devel] [PATCH 0/4] kexec-tools: add support for Xen 4.3

[Don Slutz <Don@CloudSwitch.Com>]

On 02/21/13 12:57, David Vrabel wrote:
> The series adds support for the new hypercall ABI which should be
> provided by Xen 4.3.  Images are loaded into Xen directly with no
> kernel involvement.
>
> Do not apply until the hypervisor side patches are applied to Xen.
>
> Patch 1 is unrelated but kexec wouldn't work for me without it. Not
> sure why I had problems, perhaps a toolstack specific issue?
>
> Patch 2 makes libxc 4.3 mandatory for Xen support.
>
> Patch 3 removes a use of /proc/iomem in favour of libxc.
>
> Patch 4 adds the support for loading an image into Xen.
>
> This series explicitly drops support for older version of libxc/Xen as
> supporting kexec on these hypervisors requires kernel support that
> will never be available upstream.
>
> David
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel
I did not find a fix/change to get_xen_vmcoreinfo() to call on 
xc_kexec_get_range(xc, KEXEC_RANGE_MA_VMCOREINFO, ...

I found the following to work.
    -Don Slutz

 From 2cabc018d7613b0d2ac487cbf2a2e9438a441a8d Mon Sep 17 00:00:00 2001
From: Don Slutz <Don@CloudSwitch.com>
Date: Fri, 22 Feb 2013 22:27:03 -0500
Subject: [PATCH 1/2] Switch to use xc_kexec_get_range for 
get_xen_vmcoreinfo.

Signed-off-by: Don Slutz <Don@CloudSwitch.com>
---
  kexec/crashdump-xen.c |   20 ++++++++++++++++++++
  kexec/crashdump.c     |    2 ++
  2 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/kexec/crashdump-xen.c b/kexec/crashdump-xen.c
index 56b0653..8179b72 100644
--- a/kexec/crashdump-xen.c
+++ b/kexec/crashdump-xen.c
@@ -161,6 +161,26 @@ unsigned long xen_architecture(struct 
crash_elf_info *elf_info)
  }

  #ifdef HAVE_LIBXENCTRL
+int get_xen_vmcoreinfo(uint64_t *addr, uint64_t *len)
+{
+       xc_interface *xc;
+        int ret = 0;
+
+       xc = xc_interface_open(NULL, NULL, 0);
+       if ( !xc ) {
+               fprintf(stderr, "failed to open xen control interface.\n");
+               return -1;
+       }
+
+        ret = xc_kexec_get_range(xc, KEXEC_RANGE_MA_VMCOREINFO, 0, len, 
addr);
+
+       xc_interface_close(xc);
+
+        if (ret < 0)
+            return -1;
+        return 0;
+}
+
  int xen_get_nr_phys_cpus(void)
  {
         xc_interface *xc;
diff --git a/kexec/crashdump.c b/kexec/crashdump.c
index 847d080..3d2c1b9 100644
--- a/kexec/crashdump.c
+++ b/kexec/crashdump.c
@@ -142,7 +142,9 @@ int get_kernel_vmcoreinfo(uint64_t *addr, uint64_t *len)
         return get_vmcoreinfo("/sys/kernel/vmcoreinfo", addr, len);
  }

+#ifndef HAVE_LIBXENCTRL
  int get_xen_vmcoreinfo(uint64_t *addr, uint64_t *len)
  {
         return get_vmcoreinfo("/sys/hypervisor/vmcoreinfo", addr, len);
  }
+#endif
-- 
1.7.1

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