Commit 333abaf5 authored by Wei Liu's avatar Wei Liu
Browse files

x86/hyperv: implement and use hv_smp_prepare_cpus 



Microsoft Hypervisor requires the root partition to make a few
hypercalls to setup application processors before they can be used.

Signed-off-by: default avatarLillian Grassin-Drake <ligrassi@microsoft.com>
Signed-off-by: default avatarSunil Muthuswamy <sunilmut@microsoft.com>
Co-Developed-by: default avatarLillian Grassin-Drake <ligrassi@microsoft.com>
Co-Developed-by: default avatarSunil Muthuswamy <sunilmut@microsoft.com>
Signed-off-by: default avatarWei Liu <wei.liu@kernel.org>
Reviewed-by: default avatarMichael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/20210203150435.27941-11-wei.liu@kernel.org
parent 86b5ec35

arch/x86/kernel/cpu/mshyperv.c

+29 −0
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ 
#include <asm/reboot.h>

#include <asm/nmi.h>

#include <clocksource/hyperv_timer.h>

#include <asm/numa.h>



/* Is Linux running as the root partition? */

bool hv_root_partition;
@@ -230,6 +231,32 @@ static void __init hv_smp_prepare_boot_cpu(void) 
	hv_init_spinlocks();

#endif

}



static void __init hv_smp_prepare_cpus(unsigned int max_cpus)

{

#ifdef CONFIG_X86_64

	int i;

	int ret;

#endif



	native_smp_prepare_cpus(max_cpus);



#ifdef CONFIG_X86_64

	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, i, i);

		BUG_ON(ret);

	}

#endif

}

#endif



static void __init ms_hyperv_init_platform(void)
@@ -395,6 +422,8 @@ 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



	/*