diff options
| author | Juergen Gross <jgross@suse.com> | 2018-09-12 19:41:22 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-09-12 21:15:02 +0200 |
| commit | 999696752db1099aba595aac4f8d881f8c7cf4e6 (patch) | |
| tree | 748a22c2c723e2a660ac2543d3fae56e634ef016 /arch/x86/kernel | |
| parent | 6a92b11169a65b3f8cc512c75a252cbd0d096ba0 (diff) | |
| download | linux-999696752db1099aba595aac4f8d881f8c7cf4e6.tar.bz2 | |
x86/xen: Disable CPU0 hotplug for Xen PV
Xen PV guests don't allow CPU0 hotplug, so disable it.
Signed-off-by: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: boris.ostrovsky@oracle.com
Cc: xen-devel@lists.xenproject.org
Link: http://lkml.kernel.org/r/20180912174122.24282-1-jgross@suse.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/topology.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/x86/kernel/topology.c b/arch/x86/kernel/topology.c index 12cbe2b88c0f..738bf42b0218 100644 --- a/arch/x86/kernel/topology.c +++ b/arch/x86/kernel/topology.c @@ -111,8 +111,10 @@ int arch_register_cpu(int num) /* * Currently CPU0 is only hotpluggable on Intel platforms. Other * vendors can add hotplug support later. + * Xen PV guests don't support CPU0 hotplug at all. */ - if (c->x86_vendor != X86_VENDOR_INTEL) + if (c->x86_vendor != X86_VENDOR_INTEL || + boot_cpu_has(X86_FEATURE_XENPV)) cpu0_hotpluggable = 0; /* |