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Subject[PATCH 1/1] X86: Fix the circular dependency in IPI enlightenment.
Date
From: "K. Y. Srinivasan" <kys@microsoft.com>

The IPI hypercalls depend on being able to map the Linux notion of CPU ID
to the hypervisor's notion of the CPU ID. The array hv_vp_index[] provides
this mapping. Code for populating this array depends on the IPI functionality.
Break this circular dependency.

Fixes: 68bb7bfb7985 ("X86/Hyper-V: Enable IPI enlightenments")

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Tested-by: Michael Kelley <mikelley@microsoft.com>
---
arch/x86/hyperv/hv_apic.c | 5 +++++
arch/x86/hyperv/hv_init.c | 3 +++
arch/x86/include/asm/mshyperv.h | 2 ++
3 files changed, 10 insertions(+)

diff --git a/arch/x86/hyperv/hv_apic.c b/arch/x86/hyperv/hv_apic.c
index f68855499391..63d7c196739f 100644
--- a/arch/x86/hyperv/hv_apic.c
+++ b/arch/x86/hyperv/hv_apic.c
@@ -114,6 +114,8 @@ static bool __send_ipi_mask_ex(const struct cpumask *mask, int vector)
ipi_arg->vp_set.format = HV_GENERIC_SET_SPARSE_4K;
nr_bank = cpumask_to_vpset(&(ipi_arg->vp_set), mask);
}
+ if (nr_bank == -1)
+ goto ipi_mask_ex_done;
if (!nr_bank)
ipi_arg->vp_set.format = HV_GENERIC_SET_ALL;

@@ -158,6 +160,9 @@ static bool __send_ipi_mask(const struct cpumask *mask, int vector)

for_each_cpu(cur_cpu, mask) {
vcpu = hv_cpu_number_to_vp_number(cur_cpu);
+ if (vcpu == -1)
+ goto ipi_mask_done;
+
/*
* This particular version of the IPI hypercall can
* only target upto 64 CPUs.
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 595e44e8abaa..762ce164d733 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -293,6 +293,9 @@ void __init hyperv_init(void)
if (!hv_vp_index)
return;

+ for (i = 0; i < num_possible_cpus(); i++)
+ hv_vp_index[i] = -1;
+
hv_vp_assist_page = kcalloc(num_possible_cpus(),
sizeof(*hv_vp_assist_page), GFP_KERNEL);
if (!hv_vp_assist_page) {
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index 81e768b8d9eb..299de3dcc319 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -285,6 +285,8 @@ static inline int cpumask_to_vpset(struct hv_vpset *vpset,
*/
for_each_cpu(cpu, cpus) {
vcpu = hv_cpu_number_to_vp_number(cpu);
+ if (vcpu == -1)
+ return -1;
vcpu_bank = vcpu / 64;
vcpu_offset = vcpu % 64;
__set_bit(vcpu_offset, (unsigned long *)
--
2.17.1
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