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authorJuergen Gross <jgross@suse.com>2018-09-12 20:41:22 +0300
committerIngo Molnar <mingo@kernel.org>2018-09-12 22:15:02 +0300
commit999696752db1099aba595aac4f8d881f8c7cf4e6 (patch)
tree748a22c2c723e2a660ac2543d3fae56e634ef016 /arch/x86/kernel/topology.c
parent6a92b11169a65b3f8cc512c75a252cbd0d096ba0 (diff)
downloadlinux-999696752db1099aba595aac4f8d881f8c7cf4e6.tar.xz
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/topology.c')
-rw-r--r--arch/x86/kernel/topology.c4
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;
/*