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| author | Wei Liu <wei.liu@kernel.org> | 2021-02-03 18:04:25 +0300 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2021-02-11 11:47:06 +0300 |
| commit | 99a0f46af6a7715147e81c558d558021aad4e207 (patch) | |
| tree | 6766b7ff294dc7bfaa3ec8130e7a8ca668ad5740 /arch/x86/hyperv | |
| parent | 5d0f077e0f413b7eca827b16ea8bfc4569e3946c (diff) | |
| download | linux-99a0f46af6a7715147e81c558d558021aad4e207.tar.xz | |
x86/hyperv: extract partition ID from Microsoft Hypervisor if necessary
We will need the partition ID for executing some hypercalls later.
Signed-off-by: Lillian Grassin-Drake <ligrassi@microsoft.com>
Co-Developed-by: Sunil Muthuswamy <sunilmut@microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/20210203150435.27941-7-wei.liu@kernel.org
Diffstat (limited to 'arch/x86/hyperv')
| -rw-r--r-- | arch/x86/hyperv/hv_init.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index a73f4db31870..612c555fb9aa 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -29,6 +29,8 @@ #include <clocksource/hyperv_timer.h> int hyperv_init_cpuhp; +u64 hv_current_partition_id = ~0ull; +EXPORT_SYMBOL_GPL(hv_current_partition_id); void *hv_hypercall_pg; EXPORT_SYMBOL_GPL(hv_hypercall_pg); @@ -354,6 +356,24 @@ static void __init hv_stimer_setup_percpu_clockev(void) old_setup_percpu_clockev(); } +static void __init hv_get_partition_id(void) +{ + struct hv_get_partition_id *output_page; + u64 status; + unsigned long flags; + + local_irq_save(flags); + output_page = *this_cpu_ptr(hyperv_pcpu_output_arg); + status = hv_do_hypercall(HVCALL_GET_PARTITION_ID, NULL, output_page); + if ((status & HV_HYPERCALL_RESULT_MASK) != HV_STATUS_SUCCESS) { + /* No point in proceeding if this failed */ + pr_err("Failed to get partition ID: %lld\n", status); + BUG(); + } + hv_current_partition_id = output_page->partition_id; + local_irq_restore(flags); +} + /* * This function is to be invoked early in the boot sequence after the * hypervisor has been detected. @@ -454,6 +474,12 @@ void __init hyperv_init(void) register_syscore_ops(&hv_syscore_ops); hyperv_init_cpuhp = cpuhp; + + if (cpuid_ebx(HYPERV_CPUID_FEATURES) & HV_ACCESS_PARTITION_ID) + hv_get_partition_id(); + + BUG_ON(hv_root_partition && hv_current_partition_id == ~0ull); + return; remove_cpuhp_state: |