#include <linux/rwsem.h>
#include <linux/module.h>
#include <linux/mutex.h>
+#include <asm/xen/hypervisor.h>
#include <xen/xenbus.h>
#include <xen/xen.h>
#include "xenbus_comms.h"
+#include <asm/xen/hypervisor.h>
struct xs_stored_msg {
struct list_head list;
return NULL;
}
+/*
+ * Certain older XenBus toolstack cannot handle reading values that are
+ * not populated. Some Xen 3.4 installation are incapable of doing this
+ * so if we are running on anything older than 4 do not attempt to read
+ * control/platform-feature-xs_reset_watches.
+ */
+static bool xen_strict_xenbus_quirk(void)
+{
+ uint32_t eax, ebx, ecx, edx, base;
+
+ base = xen_cpuid_base();
+ cpuid(base + 1, &eax, &ebx, &ecx, &edx);
+ if ((eax >> 16) < 4)
+ return true;
+ return false;
+
+}
static void xs_reset_watches(void)
{
int err, supported = 0;
- if (!xen_hvm_domain())
+ if (!xen_hvm_domain() || xen_initial_domain())
+ return;
+
+ if (xen_strict_xenbus_quirk())
return;
err = xenbus_scanf(XBT_NIL, "control",