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| author | Ian Campbell <ian.campbell@citrix.com> | 2010-08-23 11:59:28 +0100 |
|---|---|---|
| committer | Ian Campbell <ian.campbell@citrix.com> | 2010-08-23 11:59:28 +0100 |
| commit | c93a4dfb31f2c023da3ad1238c352452f2cc0e05 (patch) | |
| tree | c141f9f1773a8f132fbd653eaf81a0ec95f4d06f | |
| parent | da5cabf80e2433131bf0ed8993abc0f7ea618c73 (diff) | |
| download | linux-3.10-c93a4dfb31f2c023da3ad1238c352452f2cc0e05.tar.gz linux-3.10-c93a4dfb31f2c023da3ad1238c352452f2cc0e05.tar.bz2 linux-3.10-c93a4dfb31f2c023da3ad1238c352452f2cc0e05.zip | |
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: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Acked-by: Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>
| -rw-r--r-- | Documentation/kernel-parameters.txt | 1 | ||||
| -rw-r--r-- | arch/x86/xen/platform-pci-unplug.c | 5 | ||||
| -rw-r--r-- | include/xen/platform_pci.h | 1 |
3 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 2c85c0692b0..8bbe83b9d0b 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -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: diff --git a/arch/x86/xen/platform-pci-unplug.c b/arch/x86/xen/platform-pci-unplug.c index 554c002a1e1..070dfa0654b 100644 --- a/arch/x86/xen/platform-pci-unplug.c +++ b/arch/x86/xen/platform-pci-unplug.c @@ -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); diff --git a/include/xen/platform_pci.h b/include/xen/platform_pci.h index ce9d671c636..123b7752fa6 100644 --- a/include/xen/platform_pci.h +++ b/include/xen/platform_pci.h @@ -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) || \ |