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1// SPDX-License-Identifier: GPL-2.0-only2/*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.c7 *8 * Copyright 2022 Google LLC9 * 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 0xbull17 18static 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 36int 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