Hi,
> > Another useful thing would be to not create the xen platform device in case
> > "-nodefaults" was specified on the command line (that switch turns off a
> > bunch
> > of other devices present by default: vga, nic, cdrom, ...).
>
> Currently looks 'xen-platform' itself can't be created, not those devices
> existed on that.
The error message looks more like libxl tries to hot-unplug the xen
platform device.
Attached patch (untested!) hooks up the xen platform device to the
default device code we have in qemu. Two effects:
(1) As mentioned above the device will not be created in case
-nodefaults is specified on the command line.
(2) Autocreating the device is also turned off in case xen-platform
is added manually via -device.
With the patch applied you should be able to move the xen-platform
device to some other place with a simple 'qemu -device
xen-platform,addr=$slot'.
cheers,
Gerd
>From 405349bf38fc05653bfb8c971c61796e981eee98 Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kra...@redhat.com>
Date: Thu, 22 May 2014 08:34:28 +0200
Subject: [PATCH] xen: make xen-platform a default device
---
hw/i386/pc_piix.c | 2 +-
include/hw/xen/xen.h | 1 +
vl.c | 3 +++
3 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index eaf3e61..f987d03 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -385,7 +385,7 @@ static void pc_xen_hvm_init(QEMUMachineInitArgs *args)
pc_init_pci(args);
bus = pci_find_primary_bus();
- if (bus != NULL) {
+ if (bus != NULL && default_xenplatform) {
pci_create_simple(bus, -1, "xen-platform");
}
}
diff --git a/include/hw/xen/xen.h b/include/hw/xen/xen.h
index 85fda3d..b350413 100644
--- a/include/hw/xen/xen.h
+++ b/include/hw/xen/xen.h
@@ -20,6 +20,7 @@ enum xen_mode {
extern uint32_t xen_domid;
extern enum xen_mode xen_mode;
+extern int default_xenplatform;
extern bool xen_allowed;
diff --git a/vl.c b/vl.c
index 709d8cd..673148e 100644
--- a/vl.c
+++ b/vl.c
@@ -226,6 +226,7 @@ static int default_floppy = 1;
static int default_cdrom = 1;
static int default_sdcard = 1;
static int default_vga = 1;
+int default_xenplatform = 1;
static struct {
const char *driver;
@@ -247,6 +248,7 @@ static struct {
{ .driver = "isa-cirrus-vga", .flag = &default_vga },
{ .driver = "vmware-svga", .flag = &default_vga },
{ .driver = "qxl-vga", .flag = &default_vga },
+ { .driver = "xen-platform", .flag = &default_xenplatform },
};
static QemuOptsList qemu_rtc_opts = {
@@ -4101,6 +4103,7 @@ int main(int argc, char **argv, char **envp)
default_monitor = 0;
default_net = 0;
default_vga = 0;
+ default_xenplatform = 0;
}
if (is_daemonized()) {
--
1.8.3.1
