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x86/hyperv: fix logical processor creation

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Microsoft Hypervisor expects the logical processor index to be the same
as CPU's index during logical processor creation. Using cpu_physical_id
confuses hypervisor's scheduler. That causes the root partition not boot
when core scheduler is used.

This patch removes the call to cpu_physical_id and uses the CPU index
directly for bringing up logical processor. This scheme works for both
classic scheduler and core scheduler.

Fixes: 333abaf5ab (x86/hyperv: implement and use hv_smp_prepare_cpus)
Signed-off-by: Praveen Kumar <kumarpraveen@linux.microsoft.com>
Link: https://lore.kernel.org/r/20210531074046.113452-1-kumarpraveen@linux.microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Praveen Kumar
2021-05-31 13:10:46 +05:30
committed by Wei Liu
parent c6a8625fa4
commit 450605c28d
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kernel/cpu/mshyperv.c
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@@ -236,7 +236,7 @@ static void __init hv_smp_prepare_cpus(unsigned int 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));
ret = hv_call_add_logical_proc(numa_cpu_node(i), i, i);
BUG_ON(ret);
}