From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-23.5 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, UNWANTED_LANGUAGE_BODY,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9C25BC636CB for ; Fri, 16 Jul 2021 21:26:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 85302613F7 for ; Fri, 16 Jul 2021 21:26:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236291AbhGPV3m (ORCPT ); Fri, 16 Jul 2021 17:29:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52744 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236187AbhGPV3l (ORCPT ); Fri, 16 Jul 2021 17:29:41 -0400 Received: from mail-io1-xd4a.google.com (mail-io1-xd4a.google.com [IPv6:2607:f8b0:4864:20::d4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C127EC06175F for ; Fri, 16 Jul 2021 14:26:45 -0700 (PDT) Received: by mail-io1-xd4a.google.com with SMTP id h7-20020a6bb7070000b0290525efa1b760so6890547iof.16 for ; Fri, 16 Jul 2021 14:26:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=juRzq8ESjhFYr0WMDUZFXRifzNIEgaEdilTZi60Zk0c=; b=SgTEME45ZDDdbkeS4UF5RI2uaDrFBUYITt5SJ1FvhxDXRgt4BbWFpaVBn7dlBrgP9p WVXhIgBq5xvpGzvc1/0GhdwlqyWyD6Mr8q7J1Wpe2dhDGo2lBq0uqEIFbAF4jgJuiJde og6oYJtQctihedGJRMIXLOyHINH3nRzp8Dcj9k2ij0U5g8YEEgqLn1HpNwJ477i4zxNq V9RKFpL1AnDi7wrjEOkvSJkxarx8rqMbLIAw70sHv54GB2hg+ecRiYbg0PVpd8Lf5ATk ytcg8e5QLPq1HmDsmBCglirT7Yo7YRU1iAk5Nn1dzZaSNdBNxa7sgiQhMOj4JYKflrpp 7HKw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=juRzq8ESjhFYr0WMDUZFXRifzNIEgaEdilTZi60Zk0c=; b=CXeJL42cmDvEoKNikbG+P2wX+kbroiZhvIvteQtxP7DUPi3Jj/yjTpqRoWCSnzpE+T DSzUz/GvdFbBWUDaDPI31QvSApzmaXitrqGL0AiAs+k8FV1YUYNrKdpxldLzvRSA291j Us1NmCbG8u9Vn/nMUdQVYE3iW7f/Uak+bfGeCY3zdif/1Pqug4VUZyy+4Nz6SG7Ejo3x bE47Jb4WV+eBugb9zl72D/cPLVcYD0h6l/r6C4dx4ZYMEib5HPGsI+Wu8wEgvzu64PqC FstuJjTLNuOFt+oIdZiGvwSSyzwPknK8/pCyUJ0d2k8VlPpRucGc5/yv2My+DoU92A+N bH7w== X-Gm-Message-State: AOAM533L3yK58WRByZuue8NTFw5TIaG4YrPdZlrQkKZxnkpBjYTrc2no 7S6UJsvjjuIm1x9vypppLC1VvqXSW/iJyKn/vTYPARm3b8tQyjOpj2KpiSlqOIb5v2DLeK6RqnO GfExpMHad3K7JMcwuZDF3iEic1bFHkE/Q2z2BOiv6jIrsklYcnCkfu9TGnw== X-Google-Smtp-Source: ABdhPJxYFTo7yWs+u3xGJ+GYZOEGV1L4h0yd4KdB/Q1odwudpPurFUvatV+UZEUnxO/tnPWOd7IpXSaj+qA= X-Received: from oupton.c.googlers.com ([fda3:e722:ac3:cc00:2b:ff92:c0a8:404]) (user=oupton job=sendgmr) by 2002:a6b:d20c:: with SMTP id q12mr8763431iob.59.1626470805123; Fri, 16 Jul 2021 14:26:45 -0700 (PDT) Date: Fri, 16 Jul 2021 21:26:22 +0000 In-Reply-To: <20210716212629.2232756-1-oupton@google.com> Message-Id: <20210716212629.2232756-6-oupton@google.com> Mime-Version: 1.0 References: <20210716212629.2232756-1-oupton@google.com> X-Mailer: git-send-email 2.32.0.402.g57bb445576-goog Subject: [PATCH v2 05/12] selftests: KVM: Add test for KVM_{GET,SET}_CLOCK From: Oliver Upton To: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu Cc: Paolo Bonzini , Sean Christopherson , Marc Zyngier , Peter Shier , Jim Mattson , David Matlack , Ricardo Koller , Jing Zhang , Raghavendra Rao Anata , James Morse , Alexandru Elisei , Suzuki K Poulose , linux-arm-kernel@lists.infradead.org, Oliver Upton Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Add a selftest for the new KVM clock UAPI that was introduced. Ensure that the KVM clock is consistent between userspace and the guest, and that the difference in realtime will only ever cause the KVM clock to advance forward. Signed-off-by: Oliver Upton --- tools/testing/selftests/kvm/.gitignore | 1 + tools/testing/selftests/kvm/Makefile | 1 + .../testing/selftests/kvm/include/kvm_util.h | 2 + .../selftests/kvm/x86_64/kvm_clock_test.c | 210 ++++++++++++++++++ 4 files changed, 214 insertions(+) create mode 100644 tools/testing/selftests/kvm/x86_64/kvm_clock_test.c diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore index 06a351b4f93b..d0877d01e771 100644 --- a/tools/testing/selftests/kvm/.gitignore +++ b/tools/testing/selftests/kvm/.gitignore @@ -11,6 +11,7 @@ /x86_64/emulator_error_test /x86_64/get_cpuid_test /x86_64/get_msr_index_features +/x86_64/kvm_clock_test /x86_64/kvm_pv_test /x86_64/hyperv_clock /x86_64/hyperv_cpuid diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile index b853be2ae3c6..f7e24f334c6e 100644 --- a/tools/testing/selftests/kvm/Makefile +++ b/tools/testing/selftests/kvm/Makefile @@ -46,6 +46,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/get_cpuid_test TEST_GEN_PROGS_x86_64 += x86_64/hyperv_clock TEST_GEN_PROGS_x86_64 += x86_64/hyperv_cpuid TEST_GEN_PROGS_x86_64 += x86_64/hyperv_features +TEST_GEN_PROGS_x86_64 += x86_64/kvm_clock_test TEST_GEN_PROGS_x86_64 += x86_64/kvm_pv_test TEST_GEN_PROGS_x86_64 += x86_64/mmio_warning_test TEST_GEN_PROGS_x86_64 += x86_64/mmu_role_test diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h index 010b59b13917..a8ac5d52e17b 100644 --- a/tools/testing/selftests/kvm/include/kvm_util.h +++ b/tools/testing/selftests/kvm/include/kvm_util.h @@ -19,6 +19,8 @@ #define KVM_DEV_PATH "/dev/kvm" #define KVM_MAX_VCPUS 512 +#define NSEC_PER_SEC 1000000000L + /* * Callers of kvm_util only have an incomplete/opaque description of the * structure kvm_util is using to maintain the state of a VM. diff --git a/tools/testing/selftests/kvm/x86_64/kvm_clock_test.c b/tools/testing/selftests/kvm/x86_64/kvm_clock_test.c new file mode 100644 index 000000000000..34c48f2dde54 --- /dev/null +++ b/tools/testing/selftests/kvm/x86_64/kvm_clock_test.c @@ -0,0 +1,210 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2021, Google LLC. + * + * Tests for adjusting the KVM clock from userspace + */ +#include +#include +#include +#include +#include +#include +#include + +#include "test_util.h" +#include "kvm_util.h" +#include "processor.h" + +#define VCPU_ID 0 + +struct test_case { + uint64_t kvmclock_base; + int64_t realtime_offset; +}; + +static struct test_case test_cases[] = { + { .kvmclock_base = 0 }, + { .kvmclock_base = 180 * NSEC_PER_SEC }, + { .kvmclock_base = 0, .realtime_offset = -180 * NSEC_PER_SEC }, + { .kvmclock_base = 0, .realtime_offset = 180 * NSEC_PER_SEC }, +}; + +#define GUEST_SYNC_CLOCK(__stage, __val) \ + GUEST_SYNC_ARGS(__stage, __val, 0, 0, 0) + +static void guest_main(vm_paddr_t pvti_pa, struct pvclock_vcpu_time_info *pvti) +{ + int i; + + wrmsr(MSR_KVM_SYSTEM_TIME_NEW, pvti_pa | KVM_MSR_ENABLED); + for (i = 0; i < ARRAY_SIZE(test_cases); i++) { + GUEST_SYNC_CLOCK(i, __pvclock_read_cycles(pvti, rdtsc())); + } + + GUEST_DONE(); +} + +#define EXPECTED_FLAGS (KVM_CLOCK_REAL_TIME | KVM_CLOCK_HOST_TSC) + +static inline void assert_flags(struct kvm_clock_data *data) +{ + TEST_ASSERT((data->flags & EXPECTED_FLAGS) == EXPECTED_FLAGS, + "unexpected clock data flags: %x (want set: %x)", + data->flags, EXPECTED_FLAGS); +} + +static void handle_sync(struct ucall *uc, struct kvm_clock_data *start, + struct kvm_clock_data *end) +{ + uint64_t obs, exp_lo, exp_hi; + + obs = uc->args[2]; + exp_lo = start->clock; + exp_hi = end->clock; + + assert_flags(start); + assert_flags(end); + + TEST_ASSERT(exp_lo <= obs && obs <= exp_hi, + "unexpected kvm-clock value: %"PRIu64" expected range: [%"PRIu64", %"PRIu64"]", + obs, exp_lo, exp_hi); + + pr_info("kvm-clock value: %"PRIu64" expected range [%"PRIu64", %"PRIu64"]\n", + obs, exp_lo, exp_hi); +} + +static void handle_abort(struct ucall *uc) +{ + TEST_FAIL("%s at %s:%ld", (const char *)uc->args[0], + __FILE__, uc->args[1]); +} + +static void setup_clock(struct kvm_vm *vm, struct test_case *test_case) +{ + struct kvm_clock_data data; + + memset(&data, 0, sizeof(data)); + + data.clock = test_case->kvmclock_base; + if (test_case->realtime_offset) { + struct timespec ts; + int r; + + data.flags |= KVM_CLOCK_REAL_TIME; + do { + r = clock_gettime(CLOCK_REALTIME, &ts); + if (!r) + break; + } while (errno == EINTR); + + TEST_ASSERT(!r, "clock_gettime() failed: %d\n", r); + + data.realtime = ts.tv_sec * NSEC_PER_SEC; + data.realtime += ts.tv_nsec; + data.realtime += test_case->realtime_offset; + } + + vm_ioctl(vm, KVM_SET_CLOCK, &data); +} + +static void enter_guest(struct kvm_vm *vm) +{ + struct kvm_clock_data start, end; + struct kvm_run *run; + struct ucall uc; + int i, r; + + run = vcpu_state(vm, VCPU_ID); + + for (i = 0; i < ARRAY_SIZE(test_cases); i++) { + setup_clock(vm, &test_cases[i]); + + vm_ioctl(vm, KVM_GET_CLOCK, &start); + + r = _vcpu_run(vm, VCPU_ID); + vm_ioctl(vm, KVM_GET_CLOCK, &end); + + TEST_ASSERT(!r, "vcpu_run failed: %d\n", r); + TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, + "unexpected exit reason: %u (%s)", + run->exit_reason, exit_reason_str(run->exit_reason)); + + switch (get_ucall(vm, VCPU_ID, &uc)) { + case UCALL_SYNC: + handle_sync(&uc, &start, &end); + break; + case UCALL_ABORT: + handle_abort(&uc); + return; + case UCALL_DONE: + return; + } + } +} + +#define CLOCKSOURCE_PATH "/sys/devices/system/clocksource/clocksource0/current_clocksource" + +static void check_clocksource(void) +{ + char *clk_name; + struct stat st; + FILE *fp; + + fp = fopen(CLOCKSOURCE_PATH, "r"); + if (!fp) { + pr_info("failed to open clocksource file: %d; assuming TSC.\n", + errno); + return; + } + + if (fstat(fileno(fp), &st)) { + pr_info("failed to stat clocksource file: %d; assuming TSC.\n", + errno); + goto out; + } + + clk_name = malloc(st.st_size); + TEST_ASSERT(clk_name, "failed to allocate buffer to read file\n"); + + if (!fgets(clk_name, st.st_size, fp)) { + pr_info("failed to read clocksource file: %d; assuming TSC.\n", + ferror(fp)); + goto out; + } + + TEST_ASSERT(!strncmp(clk_name, "tsc\n", st.st_size), + "clocksource not supported: %s", clk_name); +out: + fclose(fp); +} + +int main(void) +{ + struct kvm_cpuid2 *best; + vm_vaddr_t pvti_gva; + vm_paddr_t pvti_gpa; + struct kvm_vm *vm; + int flags; + + flags = kvm_check_cap(KVM_CAP_ADJUST_CLOCK); + if (!(flags & KVM_CLOCK_REAL_TIME)) { + print_skip("KVM_CLOCK_REAL_TIME not supported; flags: %x", + flags); + exit(KSFT_SKIP); + } + + check_clocksource(); + + vm = vm_create_default(VCPU_ID, 0, guest_main); + + best = kvm_get_supported_cpuid(); + vcpu_set_cpuid(vm, VCPU_ID, best); + + pvti_gva = vm_vaddr_alloc(vm, getpagesize(), 0x10000); + pvti_gpa = addr_gva2gpa(vm, pvti_gva); + vcpu_args_set(vm, VCPU_ID, 2, pvti_gpa, pvti_gva); + + enter_guest(vm); + kvm_vm_free(vm); +} -- 2.32.0.402.g57bb445576-goog From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.7 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_INVALID,DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, UNWANTED_LANGUAGE_BODY,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A6CDBC636CE for ; Fri, 16 Jul 2021 21:26:51 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 4A60C613FD for ; Fri, 16 Jul 2021 21:26:51 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4A60C613FD Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvmarm-bounces@lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id F365D4B0C7; Fri, 16 Jul 2021 17:26:50 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Authentication-Results: mm01.cs.columbia.edu (amavisd-new); dkim=softfail (fail, message has been altered) header.i=@google.com Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id QNTuPQsR-UzF; Fri, 16 Jul 2021 17:26:49 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id E581B4B0C9; Fri, 16 Jul 2021 17:26:48 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id D65A64B0F2 for ; Fri, 16 Jul 2021 17:26:46 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id C9+RXeb2G+ae for ; Fri, 16 Jul 2021 17:26:45 -0400 (EDT) Received: from mail-io1-f74.google.com (mail-io1-f74.google.com [209.85.166.74]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 881EA4B0D0 for ; Fri, 16 Jul 2021 17:26:45 -0400 (EDT) Received: by mail-io1-f74.google.com with SMTP id i13-20020a5d88cd0000b02904e5ab8bdc6cso6891968iol.22 for ; Fri, 16 Jul 2021 14:26:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=juRzq8ESjhFYr0WMDUZFXRifzNIEgaEdilTZi60Zk0c=; b=SgTEME45ZDDdbkeS4UF5RI2uaDrFBUYITt5SJ1FvhxDXRgt4BbWFpaVBn7dlBrgP9p WVXhIgBq5xvpGzvc1/0GhdwlqyWyD6Mr8q7J1Wpe2dhDGo2lBq0uqEIFbAF4jgJuiJde og6oYJtQctihedGJRMIXLOyHINH3nRzp8Dcj9k2ij0U5g8YEEgqLn1HpNwJ477i4zxNq V9RKFpL1AnDi7wrjEOkvSJkxarx8rqMbLIAw70sHv54GB2hg+ecRiYbg0PVpd8Lf5ATk ytcg8e5QLPq1HmDsmBCglirT7Yo7YRU1iAk5Nn1dzZaSNdBNxa7sgiQhMOj4JYKflrpp 7HKw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=juRzq8ESjhFYr0WMDUZFXRifzNIEgaEdilTZi60Zk0c=; b=C9lxFtAt8H7MGN2XLpMWxItfxEFw/2laKgFm9LcDFRBg5T2+RS/Fuhz+hja2P1l8d5 TA0c7RX55IEdF1bKkvmplzJqXJoxeATha6VM2ZflNbtBAa8FPO6J7oVUN5hKFv/qVdD/ SShX0aKhJpV+/86nUI9OeuFmnEbUz1o9rs9NOcVWQfytY9dJyY4L0jaeUP7OybJahpWG pu9k+GdsCGI8+PV/fPus7HQdHtPSlejCvgSYRsu1aqICom0rrDQF7XIi2Ij2Rm60fSyk YZxTf5Eh2kNhNLe3s3SRRSlABZe2vrGkuD3jNTH1YMboq/3a51M+cAfVLF3Tiq/WjWV1 XABQ== X-Gm-Message-State: AOAM532+LN1yvUq5ZBHGHUHlCXjC1Psh1K09fWDycY1hqn3GfixY+7jz 2HdM0GapFtWAi2kt7YJ6PT+NblPqB34= X-Google-Smtp-Source: ABdhPJxYFTo7yWs+u3xGJ+GYZOEGV1L4h0yd4KdB/Q1odwudpPurFUvatV+UZEUnxO/tnPWOd7IpXSaj+qA= X-Received: from oupton.c.googlers.com ([fda3:e722:ac3:cc00:2b:ff92:c0a8:404]) (user=oupton job=sendgmr) by 2002:a6b:d20c:: with SMTP id q12mr8763431iob.59.1626470805123; Fri, 16 Jul 2021 14:26:45 -0700 (PDT) Date: Fri, 16 Jul 2021 21:26:22 +0000 In-Reply-To: <20210716212629.2232756-1-oupton@google.com> Message-Id: <20210716212629.2232756-6-oupton@google.com> Mime-Version: 1.0 References: <20210716212629.2232756-1-oupton@google.com> X-Mailer: git-send-email 2.32.0.402.g57bb445576-goog Subject: [PATCH v2 05/12] selftests: KVM: Add test for KVM_{GET,SET}_CLOCK From: Oliver Upton To: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu Cc: Marc Zyngier , Raghavendra Rao Anata , Peter Shier , Sean Christopherson , David Matlack , Paolo Bonzini , linux-arm-kernel@lists.infradead.org, Jim Mattson X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu Add a selftest for the new KVM clock UAPI that was introduced. Ensure that the KVM clock is consistent between userspace and the guest, and that the difference in realtime will only ever cause the KVM clock to advance forward. Signed-off-by: Oliver Upton --- tools/testing/selftests/kvm/.gitignore | 1 + tools/testing/selftests/kvm/Makefile | 1 + .../testing/selftests/kvm/include/kvm_util.h | 2 + .../selftests/kvm/x86_64/kvm_clock_test.c | 210 ++++++++++++++++++ 4 files changed, 214 insertions(+) create mode 100644 tools/testing/selftests/kvm/x86_64/kvm_clock_test.c diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore index 06a351b4f93b..d0877d01e771 100644 --- a/tools/testing/selftests/kvm/.gitignore +++ b/tools/testing/selftests/kvm/.gitignore @@ -11,6 +11,7 @@ /x86_64/emulator_error_test /x86_64/get_cpuid_test /x86_64/get_msr_index_features +/x86_64/kvm_clock_test /x86_64/kvm_pv_test /x86_64/hyperv_clock /x86_64/hyperv_cpuid diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile index b853be2ae3c6..f7e24f334c6e 100644 --- a/tools/testing/selftests/kvm/Makefile +++ b/tools/testing/selftests/kvm/Makefile @@ -46,6 +46,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/get_cpuid_test TEST_GEN_PROGS_x86_64 += x86_64/hyperv_clock TEST_GEN_PROGS_x86_64 += x86_64/hyperv_cpuid TEST_GEN_PROGS_x86_64 += x86_64/hyperv_features +TEST_GEN_PROGS_x86_64 += x86_64/kvm_clock_test TEST_GEN_PROGS_x86_64 += x86_64/kvm_pv_test TEST_GEN_PROGS_x86_64 += x86_64/mmio_warning_test TEST_GEN_PROGS_x86_64 += x86_64/mmu_role_test diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h index 010b59b13917..a8ac5d52e17b 100644 --- a/tools/testing/selftests/kvm/include/kvm_util.h +++ b/tools/testing/selftests/kvm/include/kvm_util.h @@ -19,6 +19,8 @@ #define KVM_DEV_PATH "/dev/kvm" #define KVM_MAX_VCPUS 512 +#define NSEC_PER_SEC 1000000000L + /* * Callers of kvm_util only have an incomplete/opaque description of the * structure kvm_util is using to maintain the state of a VM. diff --git a/tools/testing/selftests/kvm/x86_64/kvm_clock_test.c b/tools/testing/selftests/kvm/x86_64/kvm_clock_test.c new file mode 100644 index 000000000000..34c48f2dde54 --- /dev/null +++ b/tools/testing/selftests/kvm/x86_64/kvm_clock_test.c @@ -0,0 +1,210 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2021, Google LLC. + * + * Tests for adjusting the KVM clock from userspace + */ +#include +#include +#include +#include +#include +#include +#include + +#include "test_util.h" +#include "kvm_util.h" +#include "processor.h" + +#define VCPU_ID 0 + +struct test_case { + uint64_t kvmclock_base; + int64_t realtime_offset; +}; + +static struct test_case test_cases[] = { + { .kvmclock_base = 0 }, + { .kvmclock_base = 180 * NSEC_PER_SEC }, + { .kvmclock_base = 0, .realtime_offset = -180 * NSEC_PER_SEC }, + { .kvmclock_base = 0, .realtime_offset = 180 * NSEC_PER_SEC }, +}; + +#define GUEST_SYNC_CLOCK(__stage, __val) \ + GUEST_SYNC_ARGS(__stage, __val, 0, 0, 0) + +static void guest_main(vm_paddr_t pvti_pa, struct pvclock_vcpu_time_info *pvti) +{ + int i; + + wrmsr(MSR_KVM_SYSTEM_TIME_NEW, pvti_pa | KVM_MSR_ENABLED); + for (i = 0; i < ARRAY_SIZE(test_cases); i++) { + GUEST_SYNC_CLOCK(i, __pvclock_read_cycles(pvti, rdtsc())); + } + + GUEST_DONE(); +} + +#define EXPECTED_FLAGS (KVM_CLOCK_REAL_TIME | KVM_CLOCK_HOST_TSC) + +static inline void assert_flags(struct kvm_clock_data *data) +{ + TEST_ASSERT((data->flags & EXPECTED_FLAGS) == EXPECTED_FLAGS, + "unexpected clock data flags: %x (want set: %x)", + data->flags, EXPECTED_FLAGS); +} + +static void handle_sync(struct ucall *uc, struct kvm_clock_data *start, + struct kvm_clock_data *end) +{ + uint64_t obs, exp_lo, exp_hi; + + obs = uc->args[2]; + exp_lo = start->clock; + exp_hi = end->clock; + + assert_flags(start); + assert_flags(end); + + TEST_ASSERT(exp_lo <= obs && obs <= exp_hi, + "unexpected kvm-clock value: %"PRIu64" expected range: [%"PRIu64", %"PRIu64"]", + obs, exp_lo, exp_hi); + + pr_info("kvm-clock value: %"PRIu64" expected range [%"PRIu64", %"PRIu64"]\n", + obs, exp_lo, exp_hi); +} + +static void handle_abort(struct ucall *uc) +{ + TEST_FAIL("%s at %s:%ld", (const char *)uc->args[0], + __FILE__, uc->args[1]); +} + +static void setup_clock(struct kvm_vm *vm, struct test_case *test_case) +{ + struct kvm_clock_data data; + + memset(&data, 0, sizeof(data)); + + data.clock = test_case->kvmclock_base; + if (test_case->realtime_offset) { + struct timespec ts; + int r; + + data.flags |= KVM_CLOCK_REAL_TIME; + do { + r = clock_gettime(CLOCK_REALTIME, &ts); + if (!r) + break; + } while (errno == EINTR); + + TEST_ASSERT(!r, "clock_gettime() failed: %d\n", r); + + data.realtime = ts.tv_sec * NSEC_PER_SEC; + data.realtime += ts.tv_nsec; + data.realtime += test_case->realtime_offset; + } + + vm_ioctl(vm, KVM_SET_CLOCK, &data); +} + +static void enter_guest(struct kvm_vm *vm) +{ + struct kvm_clock_data start, end; + struct kvm_run *run; + struct ucall uc; + int i, r; + + run = vcpu_state(vm, VCPU_ID); + + for (i = 0; i < ARRAY_SIZE(test_cases); i++) { + setup_clock(vm, &test_cases[i]); + + vm_ioctl(vm, KVM_GET_CLOCK, &start); + + r = _vcpu_run(vm, VCPU_ID); + vm_ioctl(vm, KVM_GET_CLOCK, &end); + + TEST_ASSERT(!r, "vcpu_run failed: %d\n", r); + TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, + "unexpected exit reason: %u (%s)", + run->exit_reason, exit_reason_str(run->exit_reason)); + + switch (get_ucall(vm, VCPU_ID, &uc)) { + case UCALL_SYNC: + handle_sync(&uc, &start, &end); + break; + case UCALL_ABORT: + handle_abort(&uc); + return; + case UCALL_DONE: + return; + } + } +} + +#define CLOCKSOURCE_PATH "/sys/devices/system/clocksource/clocksource0/current_clocksource" + +static void check_clocksource(void) +{ + char *clk_name; + struct stat st; + FILE *fp; + + fp = fopen(CLOCKSOURCE_PATH, "r"); + if (!fp) { + pr_info("failed to open clocksource file: %d; assuming TSC.\n", + errno); + return; + } + + if (fstat(fileno(fp), &st)) { + pr_info("failed to stat clocksource file: %d; assuming TSC.\n", + errno); + goto out; + } + + clk_name = malloc(st.st_size); + TEST_ASSERT(clk_name, "failed to allocate buffer to read file\n"); + + if (!fgets(clk_name, st.st_size, fp)) { + pr_info("failed to read clocksource file: %d; assuming TSC.\n", + ferror(fp)); + goto out; + } + + TEST_ASSERT(!strncmp(clk_name, "tsc\n", st.st_size), + "clocksource not supported: %s", clk_name); +out: + fclose(fp); +} + +int main(void) +{ + struct kvm_cpuid2 *best; + vm_vaddr_t pvti_gva; + vm_paddr_t pvti_gpa; + struct kvm_vm *vm; + int flags; + + flags = kvm_check_cap(KVM_CAP_ADJUST_CLOCK); + if (!(flags & KVM_CLOCK_REAL_TIME)) { + print_skip("KVM_CLOCK_REAL_TIME not supported; flags: %x", + flags); + exit(KSFT_SKIP); + } + + check_clocksource(); + + vm = vm_create_default(VCPU_ID, 0, guest_main); + + best = kvm_get_supported_cpuid(); + vcpu_set_cpuid(vm, VCPU_ID, best); + + pvti_gva = vm_vaddr_alloc(vm, getpagesize(), 0x10000); + pvti_gpa = addr_gva2gpa(vm, pvti_gva); + vcpu_args_set(vm, VCPU_ID, 2, pvti_gpa, pvti_gva); + + enter_guest(vm); + kvm_vm_free(vm); +} -- 2.32.0.402.g57bb445576-goog _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-14.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, UNWANTED_LANGUAGE_BODY,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2D067C12002 for ; Fri, 16 Jul 2021 21:42:49 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id EA0C3613F5 for ; Fri, 16 Jul 2021 21:42:48 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EA0C3613F5 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Cc:To:From:Subject:References: Mime-Version:Message-Id:In-Reply-To:Date:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=kCXd5CZ6X2cO6qbBnTzvLnWnBEjq/3JSOEr2pubn43U=; b=lxKn7WYTtlPdn/U1yMnP4qgJPa wkicZ6HD0LW0ytsYKiB/o1oEK1ITOxKe8FTbLmVZqLXJqOHVIJRFSlKZ3qLrev1p7WgSQSbJp+VIM 7x++XFqEuY696c4mpki6OGr5lvmgf/8Q15jSb/7tsv4yCk+buWknbkB2Kj2i+qmdRsOG7hqFYqUqJ zAE7XCoPnkN5DvAPUATMUqFnt/FxmWF7OG4r1TJJrzhUKahS941/OhFbT34hzcoTy5QTMn08MYIfQ Jn/51XI0LKyiqFdyfg/Lq/cvdbJZPQyylMYmrSe0H7IDu51KWH4WPxb+DoUCTzz2sGt3lS+TfJa2y 6o5GfJtQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1m4VZK-005OCF-RC; Fri, 16 Jul 2021 21:40:27 +0000 Received: from mail-io1-xd49.google.com ([2607:f8b0:4864:20::d49]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1m4VM6-005IaF-O8 for linux-arm-kernel@lists.infradead.org; Fri, 16 Jul 2021 21:26:49 +0000 Received: by mail-io1-xd49.google.com with SMTP id b136-20020a6bb28e0000b0290520c8d13420so6889277iof.19 for ; Fri, 16 Jul 2021 14:26:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=juRzq8ESjhFYr0WMDUZFXRifzNIEgaEdilTZi60Zk0c=; b=SgTEME45ZDDdbkeS4UF5RI2uaDrFBUYITt5SJ1FvhxDXRgt4BbWFpaVBn7dlBrgP9p WVXhIgBq5xvpGzvc1/0GhdwlqyWyD6Mr8q7J1Wpe2dhDGo2lBq0uqEIFbAF4jgJuiJde og6oYJtQctihedGJRMIXLOyHINH3nRzp8Dcj9k2ij0U5g8YEEgqLn1HpNwJ477i4zxNq V9RKFpL1AnDi7wrjEOkvSJkxarx8rqMbLIAw70sHv54GB2hg+ecRiYbg0PVpd8Lf5ATk ytcg8e5QLPq1HmDsmBCglirT7Yo7YRU1iAk5Nn1dzZaSNdBNxa7sgiQhMOj4JYKflrpp 7HKw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=juRzq8ESjhFYr0WMDUZFXRifzNIEgaEdilTZi60Zk0c=; b=DYM5I45Y3I8I2kvvZTAl418xo+BWrDdb9+G4ro85verMWK3Dg8d9NYgv0ZDmNI4f8z zP38rYULjK0kQ8jlmidlPfMpkZn7SZLydSH5ULqmCYuGMFYCflegBAcy1qrk6wml2K1T cCkshaOKneGYZe/dzZD37seD0Lc1fHKNSUYbIoY2jnbgWuNNesC89JNkTP2OvgGjWd73 Gb4XE2lX3CeUh+WcPhBwZy3tcbqtlPV+hRtEJ4ivd8jooUi0dja9I1YjLwaX+5dZtCNh RkoGPiTeSdCY8SDhkIJGEmoXBxuSmzKBbrvOdbVVoUIClqEA5qz7TIQze+iKAOj+ZnPw hyiA== X-Gm-Message-State: AOAM530PaS/Gk+T3h8OqNEIMKIDWpjRkFgU3nJARdILpV8/CjMVNrJAO 4A5o2qN/bAbNDGnTfWw4TQv4gVrG/9A= X-Google-Smtp-Source: ABdhPJxYFTo7yWs+u3xGJ+GYZOEGV1L4h0yd4KdB/Q1odwudpPurFUvatV+UZEUnxO/tnPWOd7IpXSaj+qA= X-Received: from oupton.c.googlers.com ([fda3:e722:ac3:cc00:2b:ff92:c0a8:404]) (user=oupton job=sendgmr) by 2002:a6b:d20c:: with SMTP id q12mr8763431iob.59.1626470805123; Fri, 16 Jul 2021 14:26:45 -0700 (PDT) Date: Fri, 16 Jul 2021 21:26:22 +0000 In-Reply-To: <20210716212629.2232756-1-oupton@google.com> Message-Id: <20210716212629.2232756-6-oupton@google.com> Mime-Version: 1.0 References: <20210716212629.2232756-1-oupton@google.com> X-Mailer: git-send-email 2.32.0.402.g57bb445576-goog Subject: [PATCH v2 05/12] selftests: KVM: Add test for KVM_{GET,SET}_CLOCK From: Oliver Upton To: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu Cc: Paolo Bonzini , Sean Christopherson , Marc Zyngier , Peter Shier , Jim Mattson , David Matlack , Ricardo Koller , Jing Zhang , Raghavendra Rao Anata , James Morse , Alexandru Elisei , Suzuki K Poulose , linux-arm-kernel@lists.infradead.org, Oliver Upton X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210716_142646_878953_82170BB0 X-CRM114-Status: GOOD ( 22.12 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add a selftest for the new KVM clock UAPI that was introduced. Ensure that the KVM clock is consistent between userspace and the guest, and that the difference in realtime will only ever cause the KVM clock to advance forward. Signed-off-by: Oliver Upton --- tools/testing/selftests/kvm/.gitignore | 1 + tools/testing/selftests/kvm/Makefile | 1 + .../testing/selftests/kvm/include/kvm_util.h | 2 + .../selftests/kvm/x86_64/kvm_clock_test.c | 210 ++++++++++++++++++ 4 files changed, 214 insertions(+) create mode 100644 tools/testing/selftests/kvm/x86_64/kvm_clock_test.c diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore index 06a351b4f93b..d0877d01e771 100644 --- a/tools/testing/selftests/kvm/.gitignore +++ b/tools/testing/selftests/kvm/.gitignore @@ -11,6 +11,7 @@ /x86_64/emulator_error_test /x86_64/get_cpuid_test /x86_64/get_msr_index_features +/x86_64/kvm_clock_test /x86_64/kvm_pv_test /x86_64/hyperv_clock /x86_64/hyperv_cpuid diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile index b853be2ae3c6..f7e24f334c6e 100644 --- a/tools/testing/selftests/kvm/Makefile +++ b/tools/testing/selftests/kvm/Makefile @@ -46,6 +46,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/get_cpuid_test TEST_GEN_PROGS_x86_64 += x86_64/hyperv_clock TEST_GEN_PROGS_x86_64 += x86_64/hyperv_cpuid TEST_GEN_PROGS_x86_64 += x86_64/hyperv_features +TEST_GEN_PROGS_x86_64 += x86_64/kvm_clock_test TEST_GEN_PROGS_x86_64 += x86_64/kvm_pv_test TEST_GEN_PROGS_x86_64 += x86_64/mmio_warning_test TEST_GEN_PROGS_x86_64 += x86_64/mmu_role_test diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h index 010b59b13917..a8ac5d52e17b 100644 --- a/tools/testing/selftests/kvm/include/kvm_util.h +++ b/tools/testing/selftests/kvm/include/kvm_util.h @@ -19,6 +19,8 @@ #define KVM_DEV_PATH "/dev/kvm" #define KVM_MAX_VCPUS 512 +#define NSEC_PER_SEC 1000000000L + /* * Callers of kvm_util only have an incomplete/opaque description of the * structure kvm_util is using to maintain the state of a VM. diff --git a/tools/testing/selftests/kvm/x86_64/kvm_clock_test.c b/tools/testing/selftests/kvm/x86_64/kvm_clock_test.c new file mode 100644 index 000000000000..34c48f2dde54 --- /dev/null +++ b/tools/testing/selftests/kvm/x86_64/kvm_clock_test.c @@ -0,0 +1,210 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2021, Google LLC. + * + * Tests for adjusting the KVM clock from userspace + */ +#include +#include +#include +#include +#include +#include +#include + +#include "test_util.h" +#include "kvm_util.h" +#include "processor.h" + +#define VCPU_ID 0 + +struct test_case { + uint64_t kvmclock_base; + int64_t realtime_offset; +}; + +static struct test_case test_cases[] = { + { .kvmclock_base = 0 }, + { .kvmclock_base = 180 * NSEC_PER_SEC }, + { .kvmclock_base = 0, .realtime_offset = -180 * NSEC_PER_SEC }, + { .kvmclock_base = 0, .realtime_offset = 180 * NSEC_PER_SEC }, +}; + +#define GUEST_SYNC_CLOCK(__stage, __val) \ + GUEST_SYNC_ARGS(__stage, __val, 0, 0, 0) + +static void guest_main(vm_paddr_t pvti_pa, struct pvclock_vcpu_time_info *pvti) +{ + int i; + + wrmsr(MSR_KVM_SYSTEM_TIME_NEW, pvti_pa | KVM_MSR_ENABLED); + for (i = 0; i < ARRAY_SIZE(test_cases); i++) { + GUEST_SYNC_CLOCK(i, __pvclock_read_cycles(pvti, rdtsc())); + } + + GUEST_DONE(); +} + +#define EXPECTED_FLAGS (KVM_CLOCK_REAL_TIME | KVM_CLOCK_HOST_TSC) + +static inline void assert_flags(struct kvm_clock_data *data) +{ + TEST_ASSERT((data->flags & EXPECTED_FLAGS) == EXPECTED_FLAGS, + "unexpected clock data flags: %x (want set: %x)", + data->flags, EXPECTED_FLAGS); +} + +static void handle_sync(struct ucall *uc, struct kvm_clock_data *start, + struct kvm_clock_data *end) +{ + uint64_t obs, exp_lo, exp_hi; + + obs = uc->args[2]; + exp_lo = start->clock; + exp_hi = end->clock; + + assert_flags(start); + assert_flags(end); + + TEST_ASSERT(exp_lo <= obs && obs <= exp_hi, + "unexpected kvm-clock value: %"PRIu64" expected range: [%"PRIu64", %"PRIu64"]", + obs, exp_lo, exp_hi); + + pr_info("kvm-clock value: %"PRIu64" expected range [%"PRIu64", %"PRIu64"]\n", + obs, exp_lo, exp_hi); +} + +static void handle_abort(struct ucall *uc) +{ + TEST_FAIL("%s at %s:%ld", (const char *)uc->args[0], + __FILE__, uc->args[1]); +} + +static void setup_clock(struct kvm_vm *vm, struct test_case *test_case) +{ + struct kvm_clock_data data; + + memset(&data, 0, sizeof(data)); + + data.clock = test_case->kvmclock_base; + if (test_case->realtime_offset) { + struct timespec ts; + int r; + + data.flags |= KVM_CLOCK_REAL_TIME; + do { + r = clock_gettime(CLOCK_REALTIME, &ts); + if (!r) + break; + } while (errno == EINTR); + + TEST_ASSERT(!r, "clock_gettime() failed: %d\n", r); + + data.realtime = ts.tv_sec * NSEC_PER_SEC; + data.realtime += ts.tv_nsec; + data.realtime += test_case->realtime_offset; + } + + vm_ioctl(vm, KVM_SET_CLOCK, &data); +} + +static void enter_guest(struct kvm_vm *vm) +{ + struct kvm_clock_data start, end; + struct kvm_run *run; + struct ucall uc; + int i, r; + + run = vcpu_state(vm, VCPU_ID); + + for (i = 0; i < ARRAY_SIZE(test_cases); i++) { + setup_clock(vm, &test_cases[i]); + + vm_ioctl(vm, KVM_GET_CLOCK, &start); + + r = _vcpu_run(vm, VCPU_ID); + vm_ioctl(vm, KVM_GET_CLOCK, &end); + + TEST_ASSERT(!r, "vcpu_run failed: %d\n", r); + TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, + "unexpected exit reason: %u (%s)", + run->exit_reason, exit_reason_str(run->exit_reason)); + + switch (get_ucall(vm, VCPU_ID, &uc)) { + case UCALL_SYNC: + handle_sync(&uc, &start, &end); + break; + case UCALL_ABORT: + handle_abort(&uc); + return; + case UCALL_DONE: + return; + } + } +} + +#define CLOCKSOURCE_PATH "/sys/devices/system/clocksource/clocksource0/current_clocksource" + +static void check_clocksource(void) +{ + char *clk_name; + struct stat st; + FILE *fp; + + fp = fopen(CLOCKSOURCE_PATH, "r"); + if (!fp) { + pr_info("failed to open clocksource file: %d; assuming TSC.\n", + errno); + return; + } + + if (fstat(fileno(fp), &st)) { + pr_info("failed to stat clocksource file: %d; assuming TSC.\n", + errno); + goto out; + } + + clk_name = malloc(st.st_size); + TEST_ASSERT(clk_name, "failed to allocate buffer to read file\n"); + + if (!fgets(clk_name, st.st_size, fp)) { + pr_info("failed to read clocksource file: %d; assuming TSC.\n", + ferror(fp)); + goto out; + } + + TEST_ASSERT(!strncmp(clk_name, "tsc\n", st.st_size), + "clocksource not supported: %s", clk_name); +out: + fclose(fp); +} + +int main(void) +{ + struct kvm_cpuid2 *best; + vm_vaddr_t pvti_gva; + vm_paddr_t pvti_gpa; + struct kvm_vm *vm; + int flags; + + flags = kvm_check_cap(KVM_CAP_ADJUST_CLOCK); + if (!(flags & KVM_CLOCK_REAL_TIME)) { + print_skip("KVM_CLOCK_REAL_TIME not supported; flags: %x", + flags); + exit(KSFT_SKIP); + } + + check_clocksource(); + + vm = vm_create_default(VCPU_ID, 0, guest_main); + + best = kvm_get_supported_cpuid(); + vcpu_set_cpuid(vm, VCPU_ID, best); + + pvti_gva = vm_vaddr_alloc(vm, getpagesize(), 0x10000); + pvti_gpa = addr_gva2gpa(vm, pvti_gva); + vcpu_args_set(vm, VCPU_ID, 2, pvti_gpa, pvti_gva); + + enter_guest(vm); + kvm_vm_free(vm); +} -- 2.32.0.402.g57bb445576-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel