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| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-09-01 15:48:27 +0200 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-09-01 18:54:49 +0200 |
| commit | ed467e69f16e6b480e2face7bc5963834d025f91 (patch) | |
| tree | cfb1d21b4365da95678d8fe1f0e012230cef7eb0 /arch | |
| parent | xen: x86_32: do not enable iterrupts when returning from exception in interru... (diff) | |
| download | linux-ed467e69f16e6b480e2face7bc5963834d025f91.tar.xz linux-ed467e69f16e6b480e2face7bc5963834d025f91.zip | |
xen/smp: Warn user why they keel over - nosmp or noapic and what to use instead.
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
CC: stable@kernel.org
Acked-by: Ian Campbell <Ian.Campbell@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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 e79dbb95482b..d4fc6d454f8d 100644 --- a/arch/x86/xen/smp.c +++ b/arch/x86/xen/smp.c @@ -32,6 +32,7 @@ #include <xen/page.h> #include <xen/events.h> +#include <xen/hvc-console.h> #include "xen-ops.h" #include "mmu.h" @@ -207,6 +208,15 @@ static void __init xen_smp_prepare_cpus(unsigned int max_cpus) unsigned cpu; unsigned int i; + 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); |