Messages in this thread Patch in this message | | | From | Juergen Gross <> | Subject | [PATCH] x86/xen: disable cpu0 hotplug for xen pv | Date | Wed, 12 Sep 2018 19:41:22 +0200 |
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Xen pv guests don't allow cpu0 hotplug, so disable it.
Signed-off-by: Juergen Gross <jgross@suse.com> --- arch/x86/kernel/topology.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
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; /* -- 2.16.4
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