Commit c93a4dfb authored by Ian Campbell's avatar Ian Campbell

xen: pvhvm: allow user to request no emulated device unplug

this allows the user to disable pvhvm and revert to emulated devices
in case of a system misconfiguration (e.g. initramfs with only
emulated drivers in it).
Signed-off-by: default avatarIan Campbell <ian.campbell@citrix.com>
Acked-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Acked-by: default avatarStefano Stabellini <Stefano.Stabellini@eu.citrix.com>
parent da5cabf8
......@@ -2631,6 +2631,7 @@ and is between 256 and 4096 characters. It is defined in the file
all -- unplug all emulated devices (NICs and IDE disks)
ignore -- continue loading the Xen platform PCI driver even
if the version check failed
never -- do not unplug even if version check succeeds
xirc2ps_cs= [NET,PCMCIA]
Format:
......
......@@ -72,6 +72,9 @@ void __init xen_unplug_emulated_devices(void)
{
int r;
/* user explicitly requested no unplug */
if (xen_emul_unplug & XEN_UNPLUG_NEVER)
return;
/* check the version of the xen platform PCI device */
r = check_platform_magic();
/* If the version matches enable the Xen platform PCI driver.
......@@ -127,6 +130,8 @@ static int __init parse_xen_emul_unplug(char *arg)
xen_emul_unplug |= XEN_UNPLUG_ALL_NICS;
else if (!strncmp(p, "ignore", l))
xen_emul_unplug |= XEN_UNPLUG_IGNORE;
else if (!strncmp(p, "never", l))
xen_emul_unplug |= XEN_UNPLUG_NEVER;
else
printk(KERN_WARNING "unrecognised option '%s' "
"in parameter 'xen_emul_unplug'\n", p);
......
......@@ -21,6 +21,7 @@
#define XEN_UNPLUG_AUX_IDE_DISKS 4
#define XEN_UNPLUG_ALL 7
#define XEN_UNPLUG_IGNORE 8
#define XEN_UNPLUG_NEVER 16
static inline int xen_must_unplug_nics(void) {
#if (defined(CONFIG_XEN_NETDEV_FRONTEND) || \
......
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