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brintos / linux-shallow public Read only

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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