From patchwork Wed May 11 00:08:06 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vishal Annapurve X-Patchwork-Id: 571935 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 DBF2DC433EF for ; Wed, 11 May 2022 00:09:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239337AbiEKAJX (ORCPT ); Tue, 10 May 2022 20:09:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34966 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239399AbiEKAIj (ORCPT ); Tue, 10 May 2022 20:08:39 -0400 Received: from mail-pf1-x449.google.com (mail-pf1-x449.google.com [IPv6:2607:f8b0:4864:20::449]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A826060DA2 for ; Tue, 10 May 2022 17:08:31 -0700 (PDT) Received: by mail-pf1-x449.google.com with SMTP id z34-20020a056a001da200b0050e057fdd7eso241105pfw.12 for ; Tue, 10 May 2022 17:08:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=wLjvVbIdoRCH49YCihnoSmA9ubv4t2s+xqBSCz7F9jg=; b=Ki3eaTjsQ7M5NE3TLT5tuYldDGfIk2buuSWB26+3w04czbg6Ph679zSyiiZgtT9PQs 6chWf7oec2aK+bxvv3wEI653g/J5vu6EkLMuyK1wYj3x1tTeDby0vt6KjCQvEFwUIBH6 ut043eELAUSze7vzZH+uxRVRXoRZFSZuFvoMuWscyNgr/3bM6OtHGPWEXelTgJauaNk+ nBcCnvg+3SPAcI2O7dVVV3wQPahjvvLidqndO5FdjzqXtuFuRteNvFVbzjClCWZza/us AILv/Sr51khSNwawZts3gpqxwMCWbPAm0liWiAInJ/kTt3VltafGCej6wxxvpmkL1Isn jn2Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=wLjvVbIdoRCH49YCihnoSmA9ubv4t2s+xqBSCz7F9jg=; b=KDWPBNFGWcAKoAYVJKVOpdMdGOKxUsvwuvx8t6/BJ21PLMOjxTaV9fnbhuXlzBumng LAkNl7GbJ8oObuuO/GBkJ6tsEynNzzEMGvdWmA0krdZN5OoJZPphhuF7B8NxNbksifui GCLm2/bLLXX1rv60WiYWnxFMemWrJmnB8r1rPqGjfVQaTJ3JclSrUlfkhCa0t8AguXWA v92UyUqDGmS4Az5s2lAXS/5mYpjX5ukFlk8spqB9jxwaXAGcSi6ioWyEKXlqzl2cpOcX qKx8H7sJ4itk6ttwKctbDJIeMVr5YyKEfXU0kJq9Qi3edhr/w+nEILnXWx81sXAII7AI ChaQ== X-Gm-Message-State: AOAM531Jl2to3v4Y6J/bcNDXdZoETQU0eCiauS2RoNNytWsfBcNA6st9 kSu01cdXGu/K0SppPYYJAvFwNp62hHX0g+Ff X-Google-Smtp-Source: ABdhPJzVAtm2BkSdXZuq4Ku3XaizDmU0qHSs3QkXhQaKqeH6miipiHUsyaTDTE95H36auWRbhZrpMBywulp15kHC X-Received: from vannapurve2.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:41f8]) (user=vannapurve job=sendgmr) by 2002:a17:90a:e510:b0:1d9:ee23:9fa1 with SMTP id t16-20020a17090ae51000b001d9ee239fa1mr55560pjy.0.1652227710272; Tue, 10 May 2022 17:08:30 -0700 (PDT) Date: Wed, 11 May 2022 00:08:06 +0000 In-Reply-To: <20220511000811.384766-1-vannapurve@google.com> Message-Id: <20220511000811.384766-5-vannapurve@google.com> Mime-Version: 1.0 References: <20220511000811.384766-1-vannapurve@google.com> X-Mailer: git-send-email 2.36.0.550.gb090851708-goog Subject: [RFC V2 PATCH 4/8] selftests: kvm: priv_memfd_test: Add shared access test From: Vishal Annapurve To: x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: pbonzini@redhat.com, vkuznets@redhat.com, wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, shauh@kernel.org, yang.zhong@intel.com, drjones@redhat.com, ricarkol@google.com, aaronlewis@google.com, wei.w.wang@intel.com, kirill.shutemov@linux.intel.com, corbet@lwn.net, hughd@google.com, jlayton@kernel.org, bfields@fieldses.org, akpm@linux-foundation.org, chao.p.peng@linux.intel.com, yu.c.zhang@linux.intel.com, jun.nakajima@intel.com, dave.hansen@intel.com, michael.roth@amd.com, qperret@google.com, steven.price@arm.com, ak@linux.intel.com, david@redhat.com, luto@kernel.org, vbabka@suse.cz, marcorr@google.com, erdemaktas@google.com, pgonda@google.com, nikunj@amd.com, seanjc@google.com, diviness@google.com, Vishal Annapurve Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Add a test to access private memory in shared fashion which should exercise implicit memory conversion path using KVM_EXIT_MEMORY_ERROR. Signed-off-by: Vishal Annapurve --- tools/testing/selftests/kvm/priv_memfd_test.c | 69 +++++++++++++++++++ 1 file changed, 69 insertions(+) diff --git a/tools/testing/selftests/kvm/priv_memfd_test.c b/tools/testing/selftests/kvm/priv_memfd_test.c index 55e24c893b07..48bc4343e7b5 100644 --- a/tools/testing/selftests/kvm/priv_memfd_test.c +++ b/tools/testing/selftests/kvm/priv_memfd_test.c @@ -147,12 +147,81 @@ static void pmpat_guest_code(void) GUEST_DONE(); } +/* Test to verify guest shared accesses on private memory with following steps: + * 1) Upon entry, guest signals VMM that it has started. + * 2) VMM populates the shared memory with known pattern and continues guest + * execution. + * 3) Guest reads private gpa range in a shared fashion and verifies that it + * reads what VMM has written in step2. + * 3) Guest writes a different pattern on the shared memory and signals VMM + * that it has updated the shared memory. + * 4) VMM verifies shared memory contents to be same as the data populated + * in step 3 and continues guest execution. + */ +#define PMSAT_ID 1 +#define PMSAT_DESC "PrivateMemorySharedAccessTest" + +/* Guest code execution stages for private mem access test */ +#define PMSAT_GUEST_STARTED 0ULL +#define PMSAT_GUEST_TEST_MEM_UPDATED 1ULL + +static bool pmsat_handle_vm_stage(struct kvm_vm *vm, + void *test_info, + uint64_t stage) +{ + void *shared_mem = ((struct test_run_helper *)test_info)->shared_mem; + + switch (stage) { + case PMSAT_GUEST_STARTED: { + /* Initialize the contents of shared memory */ + TEST_ASSERT(do_mem_op(SET_PAT, shared_mem, + TEST_MEM_DATA_PAT1, TEST_MEM_SIZE), + "Shared memory update failed"); + VM_STAGE_PROCESSED(PMSAT_GUEST_STARTED); + break; + } + case PMSAT_GUEST_TEST_MEM_UPDATED: { + /* verify data to be same as what guest wrote */ + TEST_ASSERT(do_mem_op(VERIFY_PAT, shared_mem, + TEST_MEM_DATA_PAT2, TEST_MEM_SIZE), + "Shared memory view mismatch"); + VM_STAGE_PROCESSED(PMSAT_GUEST_TEST_MEM_UPDATED); + break; + } + default: + printf("Unhandled VM stage %ld\n", stage); + return false; + } + + return true; +} + +static void pmsat_guest_code(void) +{ + void *shared_mem = (void *)TEST_MEM_GPA; + + GUEST_SYNC(PMSAT_GUEST_STARTED); + GUEST_ASSERT(do_mem_op(VERIFY_PAT, shared_mem, + TEST_MEM_DATA_PAT1, TEST_MEM_SIZE)); + + GUEST_ASSERT(do_mem_op(SET_PAT, shared_mem, + TEST_MEM_DATA_PAT2, TEST_MEM_SIZE)); + GUEST_SYNC(PMSAT_GUEST_TEST_MEM_UPDATED); + + GUEST_DONE(); +} + static struct test_run_helper priv_memfd_testsuite[] = { [PMPAT_ID] = { .test_desc = PMPAT_DESC, .vmst_handler = pmpat_handle_vm_stage, .guest_fn = pmpat_guest_code, }, + [PMSAT_ID] = { + .test_desc = PMSAT_DESC, + .vmst_handler = pmsat_handle_vm_stage, + .guest_fn = pmsat_guest_code, + }, }; static void handle_vm_exit_hypercall(struct kvm_run *run,