From patchwork Fri Apr 8 21:05:45 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vishal Annapurve X-Patchwork-Id: 12807209 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 D8C8CC433EF for ; Fri, 8 Apr 2022 21:06:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239679AbiDHVI2 (ORCPT ); Fri, 8 Apr 2022 17:08:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38472 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239749AbiDHVIK (ORCPT ); Fri, 8 Apr 2022 17:08:10 -0400 Received: from mail-pj1-x1049.google.com (mail-pj1-x1049.google.com [IPv6:2607:f8b0:4864:20::1049]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 633A213CEFF for ; Fri, 8 Apr 2022 14:06:05 -0700 (PDT) Received: by mail-pj1-x1049.google.com with SMTP id rm11-20020a17090b3ecb00b001c713925e58so8412422pjb.6 for ; Fri, 08 Apr 2022 14:06:05 -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=4zsOaGoqxi5u8VVnNDFHZKxvAZS+RzVtuUFsffUUaGY=; b=JXLMkRS6JvIurR1ovHjYoZO2eSr4rOolTQWaY3+SzZUiP6Ub/2PveOAlWSzfq4VsNm 4vLNloLowvGCB2fVvUbo1hVchL+aQd7NmdyHAsblXwunuqvXyvxKMxuuWFSUqdX6EiPG Npqog9MAPyGM9raiDtXv7Yi22unJsCuHoOWFtd8gxpYpffl2IRj4S5GrEnuvLRnDoVPH XpnuRYmpf+HQuPQN+9dX5vrJJeDHsD4UCFnkBXwcagjwSNsPu+vCiN4eYtirqv53S7fc z6x2YcLJ/uj6DLtjk1Xa+lHssjjp0HylnGiQClroP+Lzi+mM8+yTEqf9GKNjC+ZtYkOr VCaA== 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=4zsOaGoqxi5u8VVnNDFHZKxvAZS+RzVtuUFsffUUaGY=; b=EJNL8RvpVCSoyis7oR5OKG79wjvZKbJKUJMo5KCEgdyTFxj2vPBCU5j6h8Rz+PYDpG 6lwWAKWCTU4QdLqRXwUCjNLKhOYao80sLMXqX1P+JjH+k1OEkRfYxb+HwVjp3KAWsTP+ ypIcMJk4346jl3+Y8L3g4F9YJ5MLMBalQ7xJaeXmGCBRwUzD1L3u3XM0EDbAnTM4nP9X 0Wh+wjDRaui/q4uwoUrE6lC7z9rEFQwxC22q7OSLWa2/hxgABQdftksRDe+8HNY/Tfuo bP/7Z8+J1olxJGzBRDjE2ELusxdv3f7Kb7CsuLEK+u69eDEyrlSywgrNKnyM+aaKcuUV kh8g== X-Gm-Message-State: AOAM533Un5Ysjbjsp9JmnTysXiYlz7fwreGiBT02sjQIwG52HUW3E7sh AIygin74Ne4sBXmwjg1E50C0D9QGbyccJ8bw X-Google-Smtp-Source: ABdhPJxpiNMh3TIWz6tVEMCHA/ekNoUBOfzl+LYpi/yUPlJpNr7M5OLqAuI4cHyRkKTibbaTwiiYk99gwpeL6KnX X-Received: from vannapurve2.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:41f8]) (user=vannapurve job=sendgmr) by 2002:a17:902:d511:b0:157:1304:e79e with SMTP id b17-20020a170902d51100b001571304e79emr8597077plg.100.1649451964891; Fri, 08 Apr 2022 14:06:04 -0700 (PDT) Date: Fri, 8 Apr 2022 21:05:45 +0000 In-Reply-To: <20220408210545.3915712-1-vannapurve@google.com> Message-Id: <20220408210545.3915712-6-vannapurve@google.com> Mime-Version: 1.0 References: <20220408210545.3915712-1-vannapurve@google.com> X-Mailer: git-send-email 2.35.1.1178.g4f1659d476-goog Subject: [RFC V1 PATCH 5/5] 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, 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 | 66 +++++++++++++++++++ 1 file changed, 66 insertions(+) diff --git a/tools/testing/selftests/kvm/priv_memfd_test.c b/tools/testing/selftests/kvm/priv_memfd_test.c index 0e6c19501f27..607fdc149c7d 100644 --- a/tools/testing/selftests/kvm/priv_memfd_test.c +++ b/tools/testing/selftests/kvm/priv_memfd_test.c @@ -121,12 +121,78 @@ 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 */ + memset(shared_mem, SHARED_MEM_DATA_BYTE, TEST_MEM_SIZE); + VM_STAGE_PROCESSED(PMSAT_GUEST_STARTED); + break; + } + case PMSAT_GUEST_TEST_MEM_UPDATED: { + /* verify data to be same as what guest wrote */ + TEST_ASSERT(verify_byte_pattern(shared_mem, + PRIV_MEM_DATA_BYTE, TEST_MEM_SIZE), + "Shared memory view mismatch"); + VM_STAGE_PROCESSED(PMSAT_GUEST_PRIV_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(verify_byte_pattern(shared_mem, + SHARED_MEM_DATA_BYTE, TEST_MEM_SIZE)); + + memset(shared_mem, PRIV_MEM_DATA_BYTE, 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,