[Xen-devel] [PATCH v2 05/11] x86/xen: Register resources required by kexec-tools

[Daniel Kiper <daniel.kiper@xxxxxxxxxx>]

Register resources required by kexec-tools.

v2 - suggestions/fixes:
   - change logging level
     (suggested by Konrad Rzeszutek Wilk).

Signed-off-by: Daniel Kiper <daniel.kiper@xxxxxxxxxx>
---
 arch/x86/xen/kexec.c |  150 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 150 insertions(+), 0 deletions(-)
 create mode 100644 arch/x86/xen/kexec.c

diff --git a/arch/x86/xen/kexec.c b/arch/x86/xen/kexec.c
new file mode 100644
index 0000000..7ec4c45
--- /dev/null
+++ b/arch/x86/xen/kexec.c
@@ -0,0 +1,150 @@
+/*
+ * Copyright (c) 2011 Daniel Kiper
+ * Copyright (c) 2012 Daniel Kiper, Oracle Corporation
+ *
+ * kexec/kdump implementation for Xen was written by Daniel Kiper.
+ * Initial work on it was sponsored by Google under Google Summer
+ * of Code 2011 program and Citrix. Konrad Rzeszutek Wilk from Oracle
+ * was the mentor for this project.
+ *
+ * Some ideas are taken from:
+ *   - native kexec/kdump implementation,
+ *   - kexec/kdump implementation for Xen Linux Kernel Ver. 2.6.18,
+ *   - PV-GRUB.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/kexec.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+
+#include <xen/interface/platform.h>
+#include <xen/interface/xen.h>
+#include <xen/xen.h>
+
+#include <asm/xen/hypercall.h>
+
+unsigned long xen_vmcoreinfo_maddr = 0;
+unsigned long xen_vmcoreinfo_max_size = 0;
+
+static int __init xen_init_kexec_resources(void)
+{
+       int rc;
+       static struct resource xen_hypervisor_res = {
+               .name = "Hypervisor code and data",
+               .flags = IORESOURCE_BUSY | IORESOURCE_MEM
+       };
+       struct resource *cpu_res;
+       struct xen_kexec_range xkr;
+       struct xen_platform_op cpuinfo_op;
+       uint32_t cpus, i;
+
+       if (!xen_initial_domain())
+               return 0;
+
+       if (strstr(boot_command_line, "crashkernel="))
+               pr_warn("kexec: Ignoring crashkernel option. "
+                       "It should be passed to Xen hypervisor.\n");
+
+       /* Register Crash kernel resource. */
+       xkr.range = KEXEC_RANGE_MA_CRASH;
+       rc = HYPERVISOR_kexec_op(KEXEC_CMD_kexec_get_range, &xkr);
+
+       if (rc) {
+               pr_warn("kexec: %s: HYPERVISOR_kexec_op(KEXEC_RANGE_MA_CRASH)"
+                       ": %i\n", __func__, rc);
+               return rc;
+       }
+
+       if (!xkr.size)
+               return 0;
+
+       crashk_res.start = xkr.start;
+       crashk_res.end = xkr.start + xkr.size - 1;
+       insert_resource(&iomem_resource, &crashk_res);
+
+       /* Register Hypervisor code and data resource. */
+       xkr.range = KEXEC_RANGE_MA_XEN;
+       rc = HYPERVISOR_kexec_op(KEXEC_CMD_kexec_get_range, &xkr);
+
+       if (rc) {
+               pr_warn("kexec: %s: HYPERVISOR_kexec_op(KEXEC_RANGE_MA_XEN)"
+                       ": %i\n", __func__, rc);
+               return rc;
+       }
+
+       xen_hypervisor_res.start = xkr.start;
+       xen_hypervisor_res.end = xkr.start + xkr.size - 1;
+       insert_resource(&iomem_resource, &xen_hypervisor_res);
+
+       /* Determine maximum number of physical CPUs. */
+       cpuinfo_op.cmd = XENPF_get_cpuinfo;
+       cpuinfo_op.u.pcpu_info.xen_cpuid = 0;
+       rc = HYPERVISOR_dom0_op(&cpuinfo_op);
+
+       if (rc) {
+               pr_warn("kexec: %s: HYPERVISOR_dom0_op(): %i\n", __func__, rc);
+               return rc;
+       }
+
+       cpus = cpuinfo_op.u.pcpu_info.max_present + 1;
+
+       /* Register CPUs Crash note resources. */
+       cpu_res = kcalloc(cpus, sizeof(struct resource), GFP_KERNEL);
+
+       if (!cpu_res) {
+               pr_warn("kexec: %s: kcalloc(): %i\n", __func__, -ENOMEM);
+               return -ENOMEM;
+       }
+
+       for (i = 0; i < cpus; ++i) {
+               xkr.range = KEXEC_RANGE_MA_CPU;
+               xkr.nr = i;
+               rc = HYPERVISOR_kexec_op(KEXEC_CMD_kexec_get_range, &xkr);
+
+               if (rc) {
+                       pr_warn("kexec: %s: cpu: %u: HYPERVISOR_kexec_op"
+                               "(KEXEC_RANGE_MA_XEN): %i\n", __func__, i, rc);
+                       continue;
+               }
+
+               cpu_res->name = "Crash note";
+               cpu_res->start = xkr.start;
+               cpu_res->end = xkr.start + xkr.size - 1;
+               cpu_res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
+               insert_resource(&iomem_resource, cpu_res++);
+       }
+
+       /* Get vmcoreinfo address and maximum allowed size. */
+       xkr.range = KEXEC_RANGE_MA_VMCOREINFO;
+       rc = HYPERVISOR_kexec_op(KEXEC_CMD_kexec_get_range, &xkr);
+
+       if (rc) {
+               pr_warn("kexec: %s: 
HYPERVISOR_kexec_op(KEXEC_RANGE_MA_VMCOREINFO)"
+                       ": %i\n", __func__, rc);
+               return rc;
+       }
+
+       xen_vmcoreinfo_maddr = xkr.start;
+       xen_vmcoreinfo_max_size = xkr.size;
+
+       return 0;
+}
+
+core_initcall(xen_init_kexec_resources);
-- 
1.5.6.5


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