From nobody Thu Sep 18 03:02:28 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3C7A5C4332F for ; Mon, 12 Dec 2022 18:38:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233679AbiLLSir (ORCPT ); Mon, 12 Dec 2022 13:38:47 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58184 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233651AbiLLSh4 (ORCPT ); Mon, 12 Dec 2022 13:37:56 -0500 Received: from mail-pl1-x649.google.com (mail-pl1-x649.google.com [IPv6:2607:f8b0:4864:20::649]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7E51ACE2A for ; Mon, 12 Dec 2022 10:37:45 -0800 (PST) Received: by mail-pl1-x649.google.com with SMTP id u6-20020a170903124600b00188cd4769bcso11038549plh.0 for ; Mon, 12 Dec 2022 10:37:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=O/LYLNFy5FszLpRL5Okhp+FaOOk91R8mIJyJFofIsHk=; b=E3NeDdsnxgDS9Tr8G0wja3pwLAuMK31lYDUVs+6PL67gzr26rZG5eVQfdwVKqQjet3 HcCqwoyOrjihaMQNVZC9r8ZJCF8i7tbGFVZQF6K+O383Du5qfqVl2e+4xt9Mx5dZTA5E GpGaDkoli4CEL8YdAZx1KQ6IxFrakHwYuz0nekVACS7POgZQfKu91dV2/93I8ytlbu0P uPOX6dTYBDmI0cjktI4kcYwaMaIAGuRB7qmkeYlT8xmVJTz3mLe/4zSpgFpvarrH7lFk 0/95pp0zm/jOnt7hkWhJbdJ5MtzWch1VxIj/MOL8HX2nbJE7VuJtDfEuyJW8WgmpbAyi L8Zw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=O/LYLNFy5FszLpRL5Okhp+FaOOk91R8mIJyJFofIsHk=; b=AnjgVvowPfpiCWK1vPTEN6K5ZjZD72ZqzkSZ9R+mpYhcHX1bIYRc12Dsmow4/JJvfV vXOmbSOzTxsWwGbOowSIgyJEiaHA1rddSCddmlUrtdJlfuibch3AaLkfkUX+w2xIKRTi hWS9oWH858I499aoThO5Lx4tRXkMaZBD3H9oPHR1fOK/gakD5PhnkHUFqQdd5jeC6R7M NhL0ZOzokBG6tr4uI4DYxEO2zyeiD2ovMlOW9lONoyeVDN1fjbLfquFobhjb91xz5Zdf qREg14XWELd/loGqnM3ETLnCFjydaUlpJNpAFqzL8SaLraQ4XmDRC6upf23zcHkhu5S6 hL9g== X-Gm-Message-State: ANoB5pkIWQzXkTK9LnoAHmPXHXjS/ESxdmoBALmat5casn2dICfoULbt iqNtaIovBjQ5SPXeVtYIswxsSXo7n7qA X-Google-Smtp-Source: AA0mqf7r38IGR9ujEgNBAsDqKfYpF9xhG8QHWK9CZCimkb2dcVFcppG3T3aGEVcS5K4SFHsTvc5yuspRQZ/3 X-Received: from vipin.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:479f]) (user=vipinsh job=sendgmr) by 2002:a17:902:c283:b0:189:89e2:540d with SMTP id i3-20020a170902c28300b0018989e2540dmr53606648pld.73.1670870264976; Mon, 12 Dec 2022 10:37:44 -0800 (PST) Date: Mon, 12 Dec 2022 10:37:20 -0800 In-Reply-To: <20221212183720.4062037-1-vipinsh@google.com> Mime-Version: 1.0 References: <20221212183720.4062037-1-vipinsh@google.com> X-Mailer: git-send-email 2.39.0.rc1.256.g54fd8350bd-goog Message-ID: <20221212183720.4062037-14-vipinsh@google.com> Subject: [Patch v4 13/13] KVM: selftests: Test Hyper-V extended hypercall exit to userspace From: Vipin Sharma To: seanjc@google.com, pbonzini@redhat.com, vkuznets@redhat.com, dmatlack@google.com Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Vipin Sharma Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Hyper-V extended hypercalls by default exit to userspace. Verify userspace gets the call, update the result and then verify in guest correct result is received. Signed-off-by: Vipin Sharma Reviewed-by: David Matlack --- tools/testing/selftests/kvm/.gitignore | 1 + tools/testing/selftests/kvm/Makefile | 1 + .../kvm/x86_64/hyperv_extended_hypercalls.c | 93 +++++++++++++++++++ 3 files changed, 95 insertions(+) create mode 100644 tools/testing/selftests/kvm/x86_64/hyperv_extended_hype= rcalls.c diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftes= ts/kvm/.gitignore index 082855d94c72..b17874697d74 100644 --- a/tools/testing/selftests/kvm/.gitignore +++ b/tools/testing/selftests/kvm/.gitignore @@ -24,6 +24,7 @@ /x86_64/hyperv_clock /x86_64/hyperv_cpuid /x86_64/hyperv_evmcs +/x86_64/hyperv_extended_hypercalls /x86_64/hyperv_features /x86_64/hyperv_ipi /x86_64/hyperv_svm_test diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests= /kvm/Makefile index 2275ba861e0e..a0e12f5d9835 100644 --- a/tools/testing/selftests/kvm/Makefile +++ b/tools/testing/selftests/kvm/Makefile @@ -87,6 +87,7 @@ TEST_GEN_PROGS_x86_64 +=3D x86_64/fix_hypercall_test TEST_GEN_PROGS_x86_64 +=3D x86_64/hyperv_clock TEST_GEN_PROGS_x86_64 +=3D x86_64/hyperv_cpuid TEST_GEN_PROGS_x86_64 +=3D x86_64/hyperv_evmcs +TEST_GEN_PROGS_x86_64 +=3D x86_64/hyperv_extended_hypercalls TEST_GEN_PROGS_x86_64 +=3D x86_64/hyperv_features TEST_GEN_PROGS_x86_64 +=3D x86_64/hyperv_ipi TEST_GEN_PROGS_x86_64 +=3D x86_64/hyperv_svm_test diff --git a/tools/testing/selftests/kvm/x86_64/hyperv_extended_hypercalls.= c b/tools/testing/selftests/kvm/x86_64/hyperv_extended_hypercalls.c new file mode 100644 index 000000000000..43b53a406b52 --- /dev/null +++ b/tools/testing/selftests/kvm/x86_64/hyperv_extended_hypercalls.c @@ -0,0 +1,93 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Test Hyper-V extended hypercall, HV_EXT_CALL_QUERY_CAPABILITIES (0x8001= ), + * exit to userspace and receive result in guest. + * + * Negative tests are present in hyperv_features.c + * + * Copyright 2022 Google LLC + * Author: Vipin Sharma + */ + +#include "kvm_util.h" +#include "processor.h" +#include "hyperv.h" + +/* Any value is fine */ +#define EXT_CAPABILITIES 0xbull + +static void guest_code(vm_paddr_t in_pg_gpa, vm_paddr_t out_pg_gpa, + vm_vaddr_t out_pg_gva) +{ + uint64_t *output_gva; + + wrmsr(HV_X64_MSR_GUEST_OS_ID, HYPERV_LINUX_OS_ID); + wrmsr(HV_X64_MSR_HYPERCALL, in_pg_gpa); + + output_gva =3D (uint64_t *)out_pg_gva; + + hyperv_hypercall(HV_EXT_CALL_QUERY_CAPABILITIES, in_pg_gpa, out_pg_gpa); + + /* TLFS states output will be a uint64_t value */ + GUEST_ASSERT_EQ(*output_gva, EXT_CAPABILITIES); + + GUEST_DONE(); +} + +int main(void) +{ + vm_vaddr_t hcall_out_page; + vm_vaddr_t hcall_in_page; + struct kvm_vcpu *vcpu; + struct kvm_run *run; + struct kvm_vm *vm; + uint64_t *outval; + struct ucall uc; + + /* Verify if extended hypercalls are supported */ + if (!kvm_cpuid_has(kvm_get_supported_hv_cpuid(), + HV_ENABLE_EXTENDED_HYPERCALLS)) { + print_skip("Extended calls not supported by the kernel"); + exit(KSFT_SKIP); + } + + vm =3D vm_create_with_one_vcpu(&vcpu, guest_code); + run =3D vcpu->run; + vcpu_set_hv_cpuid(vcpu); + + /* Hypercall input */ + hcall_in_page =3D vm_vaddr_alloc_pages(vm, 1); + memset(addr_gva2hva(vm, hcall_in_page), 0x0, vm->page_size); + + /* Hypercall output */ + hcall_out_page =3D vm_vaddr_alloc_pages(vm, 1); + memset(addr_gva2hva(vm, hcall_out_page), 0x0, vm->page_size); + + vcpu_args_set(vcpu, 3, addr_gva2gpa(vm, hcall_in_page), + addr_gva2gpa(vm, hcall_out_page), hcall_out_page); + + vcpu_run(vcpu); + + TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_HYPERV); + + outval =3D addr_gpa2hva(vm, run->hyperv.u.hcall.params[1]); + *outval =3D EXT_CAPABILITIES; + run->hyperv.u.hcall.result =3D HV_STATUS_SUCCESS; + + vcpu_run(vcpu); + + TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO); + + switch (get_ucall(vcpu, &uc)) { + case UCALL_ABORT: + REPORT_GUEST_ASSERT_2(uc, "arg1 =3D %ld, arg2 =3D %ld"); + break; + case UCALL_DONE: + break; + default: + TEST_FAIL("Unhandled ucall: %ld", uc.cmd); + } + + kvm_vm_free(vm); + return 0; +} --=20 2.39.0.rc1.256.g54fd8350bd-goog