diff options
| author | Roman Kisel <romank@linux.microsoft.com> | 2025-04-28 14:07:35 -0700 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2025-05-23 16:30:55 +0000 |
| commit | e7e6902fbd19b25630cf6a258c44cb385f16b1c8 (patch) | |
| tree | 11b0391b5662b648dc3e1802f1b07e1af3f963cd /drivers/hv/hv_common.c | |
| parent | f41ceff1748612b9e1538becc13dc2f1617d9d14 (diff) | |
Drivers: hv: Provide arch-neutral implementation of get_vtl()
To run in the VTL mode, Hyper-V drivers have to know what
VTL the system boots in, and the arm64/hyperv code does not
have the means to compute that.
Refactor the code to hoist the function that detects VTL,
make it arch-neutral to be able to employ it to get the VTL
on arm64.
Signed-off-by: Roman Kisel <romank@linux.microsoft.com>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Reviewed-by: Tianyu Lan <tiala@microsoft.com>
Link: https://lore.kernel.org/r/20250428210742.435282-5-romank@linux.microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <20250428210742.435282-5-romank@linux.microsoft.com>
Diffstat (limited to 'drivers/hv/hv_common.c')
| -rw-r--r-- | drivers/hv/hv_common.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c index 59792e00cecf..f8e4330bd4c7 100644 --- a/drivers/hv/hv_common.c +++ b/drivers/hv/hv_common.c @@ -317,6 +317,37 @@ void __init hv_get_partition_id(void) pr_err("Hyper-V: failed to get partition ID: %#x\n", hv_result(status)); } +#if IS_ENABLED(CONFIG_HYPERV_VTL_MODE) +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_output_get_vp_registers *output; + unsigned long flags; + u64 ret; + + local_irq_save(flags); + input = *this_cpu_ptr(hyperv_pcpu_input_arg); + output = *this_cpu_ptr(hyperv_pcpu_output_arg); + + memset(input, 0, struct_size(input, names, 1)); + input->partition_id = HV_PARTITION_ID_SELF; + input->vp_index = HV_VP_INDEX_SELF; + input->input_vtl.as_uint8 = 0; + input->names[0] = HV_REGISTER_VSM_VP_STATUS; + + ret = hv_do_hypercall(control, input, output); + if (hv_result_success(ret)) { + ret = output->values[0].reg8 & HV_VTL_MASK; + } else { + pr_err("Failed to get VTL(error: %lld) exiting...\n", ret); + BUG(); + } + + local_irq_restore(flags); + return ret; +} +#endif int __init hv_common_init(void) { |