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Subject[PATCH RFC v1 10/18] x86/hyperv: implement and use hv_smp_prepare_cpus
Date
Microsoft Hypervisor requires the root partition to make a few
hypercalls to setup application processors before they can be used.

Signed-off-by: Lillian Grassin-Drake <ligrassi@microsoft.com>
Signed-off-by: Sunil Muthuswamy <sunilmut@microsoft.com>
Co-Developed-by: Lillian Grassin-Drake <ligrassi@microsoft.com>
Co-Developed-by: Sunil Muthuswamy <sunilmut@microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
---
CPU hotplug and unplug is not yet supported in this setup, so those
paths remain untouched.
---
arch/x86/kernel/cpu/mshyperv.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)

diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index 1bf57d310f78..7522cae02759 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -203,6 +203,31 @@ static void __init hv_smp_prepare_boot_cpu(void)
hv_init_spinlocks();
#endif
}
+
+static void __init hv_smp_prepare_cpus(unsigned int max_cpus)
+{
+#if defined(CONFIG_X86_64)
+ int i;
+ int vp_index = 1;
+ int ret;
+
+ native_smp_prepare_cpus(max_cpus);
+
+ for_each_present_cpu(i) {
+ if (i == 0)
+ continue;
+ ret = hv_call_add_logical_proc(numa_cpu_node(i), i, cpu_physical_id(i));
+ BUG_ON(ret);
+ }
+
+ for_each_present_cpu(i) {
+ if (i == 0)
+ continue;
+ ret = hv_call_create_vp(numa_cpu_node(i), hv_current_partition_id, vp_index++, i);
+ BUG_ON(ret);
+ }
+#endif
+}
#endif

static void __init ms_hyperv_init_platform(void)
@@ -359,6 +384,8 @@ static void __init ms_hyperv_init_platform(void)

# ifdef CONFIG_SMP
smp_ops.smp_prepare_boot_cpu = hv_smp_prepare_boot_cpu;
+ if (hv_root_partition)
+ smp_ops.smp_prepare_cpus = hv_smp_prepare_cpus;
# endif

/*
--
2.20.1
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