Re: [Xen-devel] xenstore watch not working under 32 bit domU (xen stable 2.6.32 from jeremy git tree)

[Vasiliy G Tolstov <v.tolstov@xxxxxxxxx>]

On Mon, 2010-11-22 at 14:53 +0300, Vasiliy G Tolstov wrote:
> Hello. Can You helps me, i'm try to investigate why under 64 bit domU
> this kernel module work's correct, but under 686 watch does not work:


Anybody check this?
More simple example, from balloon.c driver
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/pagemap.h>
#include <linux/highmem.h>
#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/sysdev.h>
#include <linux/swap.h>

#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/uaccess.h>
#include <asm/tlb.h>
#include <asm/e820.h>

#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>

#include <xen/xen.h>
#include <xen/interface/xen.h>
#include <xen/interface/memory.h>
#include <xen/xenbus.h>
#include <xen/features.h>
#include <xen/page.h>


static struct xenbus_watch target_watch =
{
        .node = "data"
};

/* React to a change in the target key */
static void watch_target(struct xenbus_watch *watch,
                         const char **vec, unsigned int len)
{
        char *cmd;
        int err;
        printk(KERN_ERR "watch_target\n");
}

static int balloon_init_watcher(struct notifier_block *notifier,
                                unsigned long event,
                                void *data)
{
        int err;
        printk(KERN_ERR "init_watcher\n");
        err = register_xenbus_watch(&target_watch);
        if (err)
                printk(KERN_ERR "Failed to set balloon watcher\n");

        return NOTIFY_DONE;
}

static struct notifier_block xenstore_notifier;

static int __init balloon_init(void)
{
        printk(KERN_ERR "init\n");
        target_watch.callback = watch_target;
        xenstore_notifier.notifier_call = balloon_init_watcher;

        register_xenstore_notifier(&xenstore_notifier);

        return 0;
}

subsys_initcall(balloon_init);

static void balloon_exit(void)
{
        printk(KERN_ERR "exit\n");
    return;
}

module_exit(balloon_exit);

MODULE_LICENSE("GPL");


Watch not WORK! Compile with make file

obj-m += xenmgm.o

KDIR := /lib/modules/$(shell uname -r)
PWD := $(shell pwd)

all:
        $(MAKE) -C $(KDIR)/build SUBDIRS=$(PWD) M=$(PWD) modules
        
clean:
        $(MAKE) -C $(KDIR)/build SUBDIRS=$(PWD) M=$(PWD) clean
        rm -f modules.order Module.*

install:
        mkdir -p $(KDIR)/kernel/drivers/xen/xenmgm/
        install -m 0644 -o root xenmgm.ko $(KDIR)/kernel/drivers/xen/xenmgm/
        depmod -q


I think, that is becouse i compiled module and not in kernel. Can
somebody check this? (use stable-2.6.32.x commit diff
b92d1ec0a86acd2dfe14d732c6a9304aae0ccf26)
kernel config in attached file

2.6.32.config
Description: Text Data

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