diff options
| author | Juergen Gross <[email protected]> | 2018-09-12 19:41:22 +0200 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2018-09-12 21:15:02 +0200 |
| commit | 999696752db1099aba595aac4f8d881f8c7cf4e6 (patch) | |
| tree | 748a22c2c723e2a660ac2543d3fae56e634ef016 | |
| parent | 6a92b11169a65b3f8cc512c75a252cbd0d096ba0 (diff) | |
x86/xen: Disable CPU0 hotplug for Xen PV
Xen PV guests don't allow CPU0 hotplug, so disable it.
Signed-off-by: Juergen Gross <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
| -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; /* |