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 #include "kvm_util.h" 12 #include "processor.h" 13 #include "hyperv.h" 14 15 /* Any value is fine */ 16 #define EXT_CAPABILITIES 0xbull 17 18 static void guest_code(vm_paddr_t in_pg_gpa, vm_paddr_t out_pg_gpa, 19 vm_vaddr_t out_pg_gva) 20 { 21 uint64_t *output_gva; 22 23 wrmsr(HV_X64_MSR_GUEST_OS_ID, HYPERV_LINUX_OS_ID); 24 wrmsr(HV_X64_MSR_HYPERCALL, in_pg_gpa); 25 26 output_gva = (uint64_t *)out_pg_gva; 27 28 hyperv_hypercall(HV_EXT_CALL_QUERY_CAPABILITIES, in_pg_gpa, out_pg_gpa); 29 30 /* TLFS states output will be a uint64_t value */ 31 GUEST_ASSERT_EQ(*output_gva, EXT_CAPABILITIES); 32 33 GUEST_DONE(); 34 } 35 36 int main(void) 37 { 38 vm_vaddr_t hcall_out_page; 39 vm_vaddr_t hcall_in_page; 40 struct kvm_vcpu *vcpu; 41 struct kvm_run *run; 42 struct kvm_vm *vm; 43 uint64_t *outval; 44 struct ucall uc; 45 46 TEST_REQUIRE(kvm_has_cap(KVM_CAP_HYPERV_CPUID)); 47 48 /* Verify if extended hypercalls are supported */ 49 if (!kvm_cpuid_has(kvm_get_supported_hv_cpuid(), 50 HV_ENABLE_EXTENDED_HYPERCALLS)) { 51 print_skip("Extended calls not supported by the kernel"); 52 exit(KSFT_SKIP); 53 } 54 55 vm = vm_create_with_one_vcpu(&vcpu, guest_code); 56 run = vcpu->run; 57 vcpu_set_hv_cpuid(vcpu); 58 59 /* Hypercall input */ 60 hcall_in_page = vm_vaddr_alloc_pages(vm, 1); 61 memset(addr_gva2hva(vm, hcall_in_page), 0x0, vm->page_size); 62 63 /* Hypercall output */ 64 hcall_out_page = vm_vaddr_alloc_pages(vm, 1); 65 memset(addr_gva2hva(vm, hcall_out_page), 0x0, vm->page_size); 66 67 vcpu_args_set(vcpu, 3, addr_gva2gpa(vm, hcall_in_page), 68 addr_gva2gpa(vm, hcall_out_page), hcall_out_page); 69 70 vcpu_run(vcpu); 71 72 TEST_ASSERT(run->exit_reason == KVM_EXIT_HYPERV, 73 "Unexpected exit reason: %u (%s)", 74 run->exit_reason, exit_reason_str(run->exit_reason)); 75 76 outval = addr_gpa2hva(vm, run->hyperv.u.hcall.params[1]); 77 *outval = EXT_CAPABILITIES; 78 run->hyperv.u.hcall.result = HV_STATUS_SUCCESS; 79 80 vcpu_run(vcpu); 81 82 TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, 83 "Unexpected exit reason: %u (%s)", 84 run->exit_reason, exit_reason_str(run->exit_reason)); 85 86 switch (get_ucall(vcpu, &uc)) { 87 case UCALL_ABORT: 88 REPORT_GUEST_ASSERT(uc); 89 break; 90 case UCALL_DONE: 91 break; 92 default: 93 TEST_FAIL("Unhandled ucall: %ld", uc.cmd); 94 } 95 96 kvm_vm_free(vm); 97 return 0; 98 } 99