Hi all,
this patch adds a xen_unplug command line option to the kernel to unplug
xen emulated devices.
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
arch/x86/xen/enlighten.c | 30 +++++++++++++++++++++++++++++-
1 files changed, 29 insertions(+), 1 deletions(-)
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 2ce2da1..7acb130 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -37,6 +37,7 @@
#include <xen/interface/memory.h>
#include <xen/interface/hvm/hvm_op.h>
#include <xen/interface/hvm/params.h>
+#include <xen/interface/platform_pci.h>
#include <xen/features.h>
#include <xen/page.h>
#include <xen/hvm.h>
@@ -86,6 +87,7 @@ struct shared_info xen_dummy_shared_info;
void *xen_initial_gdt;
int xen_have_vector_callback;
+int unplug;
/*
* Point at some empty memory to start with. We map the real shared_info
@@ -1389,9 +1391,35 @@ void __init xen_guest_init(void)
x86_platform_ipi_callback = do_hvm_pv_evtchn_intr;
xen_have_vector_callback = 1;
}
-
+ if (unplug) {
+ /* unplug emulated devices */
+ outw(UNPLUG_ALL, XEN_IOPORT_UNPLUG);
+ }
have_vcpu_info_placement = 0;
x86_init.irqs.intr_init = xen_init_IRQ;
machine_ops = xen_machine_ops;
}
+static int __init parse_unplug(char *arg)
+{
+ char *p, *q;
+
+ for (p = arg; p; p = q) {
+ q = strchr(arg, ',');
+ if (q)
+ *q++ = '\0';
+ if (!strcmp(p, "all"))
+ unplug |= UNPLUG_ALL;
+ else if (!strcmp(p, "ide-disks"))
+ unplug |= UNPLUG_ALL_IDE_DISKS;
+ else if (!strcmp(p, "aux-ide-disks"))
+ unplug |= UNPLUG_AUX_IDE_DISKS;
+ else if (!strcmp(p, "nics"))
+ unplug |= UNPLUG_ALL_NICS;
+ else
+ printk(KERN_WARNING "unrecognised option '%s' "
+ "in module parameter 'dev_unplug'\n", p);
+ }
+ return 0;
+}
+early_param("xen_unplug", parse_unplug);
--
1.5.4.3
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