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| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-09-01 17:48:27 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-11-08 01:46:48 +0400 |
| commit | 657c2a0c9fd3e6945c3c2ab6bcf49e8d9bbf5916 (patch) | |
| tree | 208ccb51e11a6eb537cd04fa96f8f7cb7fe5b3c9 /arch | |
| parent | 5e30cfbee70bd109cdf040d975f2055e83d8cf71 (diff) | |
| download | linux-657c2a0c9fd3e6945c3c2ab6bcf49e8d9bbf5916.tar.xz | |
xen/smp: Warn user why they keel over - nosmp or noapic and what to use instead.
commit ed467e69f16e6b480e2face7bc5963834d025f91 upstream.
We have hit a couple of customer bugs where they would like to
use those parameters to run an UP kernel - but both of those
options turn of important sources of interrupt information so
we end up not being able to boot. The correct way is to
pass in 'dom0_max_vcpus=1' on the Xen hypervisor line and
the kernel will patch itself to be a UP kernel.
Fixes bug: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=637308
Acked-by: Ian Campbell <Ian.Campbell@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/xen/smp.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c index ad5df678335e..6c6e73362327 100644 --- a/arch/x86/xen/smp.c +++ b/arch/x86/xen/smp.c @@ -30,6 +30,7 @@ #include <xen/page.h> #include <xen/events.h> +#include <xen/hvc-console.h> #include "xen-ops.h" #include "mmu.h" @@ -180,6 +181,15 @@ static void __init xen_smp_prepare_cpus(unsigned int max_cpus) { unsigned cpu; + if (skip_ioapic_setup) { + char *m = (max_cpus == 0) ? + "The nosmp parameter is incompatible with Xen; " \ + "use Xen dom0_max_vcpus=1 parameter" : + "The noapic parameter is incompatible with Xen"; + + xen_raw_printk(m); + panic(m); + } xen_init_lock_cpu(0); smp_store_cpu_info(0); |