Commit 1dc7ce99 authored by Ian Campbell's avatar Ian Campbell

xen: pvhvm: rename xen_emul_unplug=ignore to =unnnecessary

It is not immediately clear what this option causes to become
ignored. The actual meaning is that it is not necessary to unplug the
emulated devices to safely use the PV ones, even if the platform does
not support the unplug protocol. (pressumably the user will only add
this option if they have ensured that their domain configuration is
safe).

I think xen_emul_unplug=unnecessary better captures this.
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 c93a4dfb
......@@ -2629,8 +2629,9 @@ and is between 256 and 4096 characters. It is defined in the file
aux-ide-disks -- unplug non-primary-master IDE devices
nics -- unplug network devices
all -- unplug all emulated devices (NICs and IDE disks)
ignore -- continue loading the Xen platform PCI driver even
if the version check failed
unnecessary -- unplugging emulated devices is
unnecessary even if the host did not respond to
the unplug protocol
never -- do not unplug even if version check succeeds
xirc2ps_cs= [NET,PCMCIA]
......
......@@ -78,10 +78,11 @@ void __init xen_unplug_emulated_devices(void)
/* check the version of the xen platform PCI device */
r = check_platform_magic();
/* If the version matches enable the Xen platform PCI driver.
* Also enable the Xen platform PCI driver if the version is really old
* and the user told us to ignore it. */
* Also enable the Xen platform PCI driver if the host does
* not support the unplug protocol (XEN_PLATFORM_ERR_MAGIC)
* but the user told us that unplugging is unnecessary. */
if (r && !(r == XEN_PLATFORM_ERR_MAGIC &&
(xen_emul_unplug & XEN_UNPLUG_IGNORE)))
(xen_emul_unplug & XEN_UNPLUG_UNNECESSARY)))
return;
/* Set the default value of xen_emul_unplug depending on whether or
* not the Xen PV frontends and the Xen platform PCI driver have
......@@ -102,7 +103,7 @@ void __init xen_unplug_emulated_devices(void)
}
}
/* Now unplug the emulated devices */
if (!(xen_emul_unplug & XEN_UNPLUG_IGNORE))
if (!(xen_emul_unplug & XEN_UNPLUG_UNNECESSARY))
outw(xen_emul_unplug, XEN_IOPORT_UNPLUG);
xen_platform_pci_unplug = xen_emul_unplug;
}
......@@ -128,8 +129,8 @@ static int __init parse_xen_emul_unplug(char *arg)
xen_emul_unplug |= XEN_UNPLUG_AUX_IDE_DISKS;
else if (!strncmp(p, "nics", l))
xen_emul_unplug |= XEN_UNPLUG_ALL_NICS;
else if (!strncmp(p, "ignore", l))
xen_emul_unplug |= XEN_UNPLUG_IGNORE;
else if (!strncmp(p, "unnecessary", l))
xen_emul_unplug |= XEN_UNPLUG_UNNECESSARY;
else if (!strncmp(p, "never", l))
xen_emul_unplug |= XEN_UNPLUG_NEVER;
else
......
......@@ -834,7 +834,7 @@ static int blkfront_probe(struct xenbus_device *dev,
char *type;
int len;
/* no unplug has been done: do not hook devices != xen vbds */
if (xen_platform_pci_unplug & XEN_UNPLUG_IGNORE) {
if (xen_platform_pci_unplug & XEN_UNPLUG_UNNECESSARY) {
int major;
if (!VDEV_IS_EXTENDED(vdevice))
......
......@@ -20,7 +20,7 @@
#define XEN_UNPLUG_ALL_NICS 2
#define XEN_UNPLUG_AUX_IDE_DISKS 4
#define XEN_UNPLUG_ALL 7
#define XEN_UNPLUG_IGNORE 8
#define XEN_UNPLUG_UNNECESSARY 8
#define XEN_UNPLUG_NEVER 16
static inline int xen_must_unplug_nics(void) {
......
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