[PATCH v2 2/3] hyperv: Fix pointer type for the output of the hypercall in get_vtl(void)

[Roman Kisel]

Commit bc905fa8b633 ("hyperv: Switch from hyperv-tlfs.h to hyperv/hvhdk.h")
changed the type of the output pointer to `struct hv_register_assoc` from
`struct hv_get_vp_registers_output`. That leads to an incorrect computation,
and leaves the system broken.

Use the correct pointer type for the output of the GetVpRegisters hypercall.

Signed-off-by: Roman Kisel <rom...@linux.microsoft.com>
---
 arch/x86/hyperv/hv_init.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 3cf2a227d666..ba469d6b8250 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -416,13 +416,13 @@ static u8 __init get_vtl(void)
 {
        u64 control = HV_HYPERCALL_REP_COMP_1 | HVCALL_GET_VP_REGISTERS;
        struct hv_input_get_vp_registers *input;
-       struct hv_register_assoc *output;
+       struct hv_output_get_vp_registers *output;
        unsigned long flags;
        u64 ret;
 
        local_irq_save(flags);
        input = *this_cpu_ptr(hyperv_pcpu_input_arg);
-       output = (struct hv_register_assoc *)input;
+       output = (struct hv_output_get_vp_registers *)input;
 
        memset(input, 0, struct_size(input, names, 1));
        input->partition_id = HV_PARTITION_ID_SELF;
@@ -432,7 +432,7 @@ static u8 __init get_vtl(void)
 
        ret = hv_do_hypercall(control, input, output);
        if (hv_result_success(ret)) {
-               ret = output->value.reg8 & HV_X64_VTL_MASK;
+               ret = output->values[0].reg8 & HV_X64_VTL_MASK;
        } else {
                pr_err("Failed to get VTL(error: %lld) exiting...\n", ret);
                BUG();
-- 
2.34.1