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Merge branch 'for-upstream/pvhvm' of git://xenbits.xensource.com/people/ianc/linux-2.6

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* 'for-upstream/pvhvm' of git://xenbits.xensource.com/people/ianc/linux-2.6:
  xen: pvhvm: make it clearer that XEN_UNPLUG_* define bits in a bitfield
  xen: pvhvm: rename xen_emul_unplug=ignore to =unnnecessary
  xen: pvhvm: allow user to request no emulated device unplug
This commit is contained in:
Linus Torvalds 2010-08-23 18:29:18 -07:00
commit c05e1e23b8
4 changed files with 26 additions and 14 deletions
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6
Documentation/kernel-parameters.txt
View File

@ -2629,8 +2629,10 @@ 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]
Format:

18
arch/x86/xen/platform-pci-unplug.c
View File

@ -72,13 +72,17 @@ 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.
* 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
@ -99,7 +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;
}
@ -125,8 +129,10 @@ 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
printk(KERN_WARNING "unrecognised option '%s' "
"in parameter 'xen_emul_unplug'\n", p);

2
drivers/block/xen-blkfront.c
View File

@ -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))

14
include/xen/platform_pci.h
View File

@ -16,11 +16,15 @@
#define XEN_IOPORT_PROTOVER (XEN_IOPORT_BASE + 2) /* 1 byte access (R) */
#define XEN_IOPORT_PRODNUM (XEN_IOPORT_BASE + 2) /* 2 byte access (W) */
#define XEN_UNPLUG_ALL_IDE_DISKS 1
#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_ALL_IDE_DISKS (1<<0)
#define XEN_UNPLUG_ALL_NICS (1<<1)
#define XEN_UNPLUG_AUX_IDE_DISKS (1<<2)
#define XEN_UNPLUG_ALL (XEN_UNPLUG_ALL_IDE_DISKS|\
XEN_UNPLUG_ALL_NICS|\
XEN_UNPLUG_AUX_IDE_DISKS)
#define XEN_UNPLUG_UNNECESSARY (1<<16)
#define XEN_UNPLUG_NEVER (1<<17)
static inline int xen_must_unplug_nics(void) {
#if (defined(CONFIG_XEN_NETDEV_FRONTEND) || \