tools/testing/selftests/kvm/x86_64/hyperv_extended_hypercalls.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Test Hyper-V extended hypercall, HV_EXT_CALL_QUERY_CAPABILITIES (0x8001),
   4  * exit to userspace and receive result in guest.
   5  *
   6  * Negative tests are present in hyperv_features.c
   7  *
   8  * Copyright 2022 Google LLC
   9  * Author: Vipin Sharma <vipinsh@google.com>
  10  */
  11
  12 #include "kvm_util.h"
  13 #include "processor.h"
  14 #include "hyperv.h"
  15
  16 /* Any value is fine */
  17 #define EXT_CAPABILITIES 0xbull
  18
  19 static void guest_code(vm_paddr_t in_pg_gpa, vm_paddr_t out_pg_gpa,
  20                        vm_vaddr_t out_pg_gva)
  21 {
  22         uint64_t *output_gva;
  23
  24         wrmsr(HV_X64_MSR_GUEST_OS_ID, HYPERV_LINUX_OS_ID);
  25         wrmsr(HV_X64_MSR_HYPERCALL, in_pg_gpa);
  26
  27         output_gva = (uint64_t *)out_pg_gva;
  28
  29         hyperv_hypercall(HV_EXT_CALL_QUERY_CAPABILITIES, in_pg_gpa, out_pg_gpa);
  30
  31         /* TLFS states output will be a uint64_t value */
  32         GUEST_ASSERT_EQ(*output_gva, EXT_CAPABILITIES);
  33
  34         GUEST_DONE();
  35 }
  36
  37 int main(void)
  38 {
  39         vm_vaddr_t hcall_out_page;
  40         vm_vaddr_t hcall_in_page;
  41         struct kvm_vcpu *vcpu;
  42         struct kvm_run *run;
  43         struct kvm_vm *vm;
  44         uint64_t *outval;
  45         struct ucall uc;
  46
  47         /* Verify if extended hypercalls are supported */
  48         if (!kvm_cpuid_has(kvm_get_supported_hv_cpuid(),
  49                            HV_ENABLE_EXTENDED_HYPERCALLS)) {
  50                 print_skip("Extended calls not supported by the kernel");
  51                 exit(KSFT_SKIP);
  52         }
  53
  54         vm = vm_create_with_one_vcpu(&vcpu, guest_code);
  55         run = vcpu->run;
  56         vcpu_set_hv_cpuid(vcpu);
  57
  58         /* Hypercall input */
  59         hcall_in_page = vm_vaddr_alloc_pages(vm, 1);
  60         memset(addr_gva2hva(vm, hcall_in_page), 0x0, vm->page_size);
  61
  62         /* Hypercall output */
  63         hcall_out_page = vm_vaddr_alloc_pages(vm, 1);
  64         memset(addr_gva2hva(vm, hcall_out_page), 0x0, vm->page_size);
  65
  66         vcpu_args_set(vcpu, 3, addr_gva2gpa(vm, hcall_in_page),
  67                       addr_gva2gpa(vm, hcall_out_page), hcall_out_page);
  68
  69         vcpu_run(vcpu);
  70
  71         TEST_ASSERT(run->exit_reason == KVM_EXIT_HYPERV,
  72                     "Unexpected exit reason: %u (%s)",
  73                     run->exit_reason, exit_reason_str(run->exit_reason));
  74
  75         outval = addr_gpa2hva(vm, run->hyperv.u.hcall.params[1]);
  76         *outval = EXT_CAPABILITIES;
  77         run->hyperv.u.hcall.result = HV_STATUS_SUCCESS;
  78
  79         vcpu_run(vcpu);
  80
  81         TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
  82                     "Unexpected exit reason: %u (%s)",
  83                     run->exit_reason, exit_reason_str(run->exit_reason));
  84
  85         switch (get_ucall(vcpu, &uc)) {
  86         case UCALL_ABORT:
  87                 REPORT_GUEST_ASSERT_2(uc, "arg1 = %ld, arg2 = %ld");
  88                 break;
  89         case UCALL_DONE:
  90                 break;
  91         default:
  92                 TEST_FAIL("Unhandled ucall: %ld", uc.cmd);
  93         }
  94
  95         kvm_vm_free(vm);
  96         return 0;
  97 }