From patchwork Fri Apr 8 21:05:44 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vishal Annapurve X-Patchwork-Id: 559025 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 23A4EC433F5 for ; Fri, 8 Apr 2022 21:06:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239744AbiDHVIJ (ORCPT ); Fri, 8 Apr 2022 17:08:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38074 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239742AbiDHVII (ORCPT ); Fri, 8 Apr 2022 17:08:08 -0400 Received: from mail-pl1-x64a.google.com (mail-pl1-x64a.google.com [IPv6:2607:f8b0:4864:20::64a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 161ED13CEFF for ; Fri, 8 Apr 2022 14:06:03 -0700 (PDT) Received: by mail-pl1-x64a.google.com with SMTP id w14-20020a1709027b8e00b0015386056d2bso5037667pll.5 for ; Fri, 08 Apr 2022 14:06:03 -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=p+6J5avDF84ftaGe39tTHRoP/NBW8772y66wg1YfZYw=; b=l0FXhWa/6YJKcTE5WGzDyEC+UrLkSpJwQDJkJsDVyNCbeKa+j011f+nnEMfM/d7Yn2 vqnoDRBaNf9IoPd4xNvbP9KSD58R/Fp3gNuGLjKhyxKStwtunD0MB37DqfQP0LW7PGrq slph68rE/UdnBwzmZ+mNKfL9TSUcXXMOOj04cUVMIxtdTSnhJT9Y1XLA8FHGfPARTd0U JaTa3xOyWnbW51pC/QiY87Gd0W4v4IY+IrQrJUW29R/ZPK4CuLQ8gsy0K56vhahESAbU osOkiuhnjdio/riFZgIMbrFuClGk0cxmaxxxQCCZ9VD3bSQ4uOtdMM9lNNNKshoMx3X0 xcBw== 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=p+6J5avDF84ftaGe39tTHRoP/NBW8772y66wg1YfZYw=; b=agYp/umvPadODvaIP9IrvWT6DAyw6C7Opif3x8EOoOYi4nyjnR2Q3KjFKEVkNiNRJL nC7CeMVWlAvzYzCpuTXVyKpgQHdQHi0p1p+OMW//B9MlZa3BsltK+YDtgpdTcehsj11g h4zd/ByZXJgpL/+ttRsoWXV8SNVWgRXyJIWOb4ym2h260VTuqWAkj80Z3UYuSSGe14gU Vq2OpDZxf+Maz4VefiDjiYumv9xGrKeCcdjgdSoYDX0U5TrQ3Ky+cz17/gmRDMfx4Mz+ XF+4If4GH41DPRiSbXnurW7FexOmZbf+pFv225x4BqfMeLORRE+f4Nym/0DtZjOGb2s6 Yg7g== X-Gm-Message-State: AOAM5333q9qq0eDrMheUsj5zqc93tO/0T5x+IFb9bvTbaekrPDCrWUVy moOnHbaJl2ElqRD6gYgD8f8dlr1NX7pcQdiY X-Google-Smtp-Source: ABdhPJwkd3il5WzGjYKAv2n2CphkdVejN98fg/wNCluE/8xZWC50B6gLsb61B6viCzpZYwi6CRhlp5PWQl3rD8L2 X-Received: from vannapurve2.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:41f8]) (user=vannapurve job=sendgmr) by 2002:a05:6a00:846:b0:4fb:3b79:fc94 with SMTP id q6-20020a056a00084600b004fb3b79fc94mr21231620pfk.76.1649451962533; Fri, 08 Apr 2022 14:06:02 -0700 (PDT) Date: Fri, 8 Apr 2022 21:05:44 +0000 In-Reply-To: <20220408210545.3915712-1-vannapurve@google.com> Message-Id: <20220408210545.3915712-5-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 4/5] selftests: kvm: priv_memfd_test: Add support for memory conversion 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 handling of explicit private/shared memory conversion using KVM_HC_MAP_GPA_RANGE and implicit memory conversion by handling KVM_EXIT_MEMORY_ERROR. Signed-off-by: Vishal Annapurve --- tools/testing/selftests/kvm/priv_memfd_test.c | 87 +++++++++++++++++++ 1 file changed, 87 insertions(+) diff --git a/tools/testing/selftests/kvm/priv_memfd_test.c b/tools/testing/selftests/kvm/priv_memfd_test.c index 11ccdb853a84..0e6c19501f27 100644 --- a/tools/testing/selftests/kvm/priv_memfd_test.c +++ b/tools/testing/selftests/kvm/priv_memfd_test.c @@ -129,6 +129,83 @@ static struct test_run_helper priv_memfd_testsuite[] = { }, }; +static void handle_vm_exit_hypercall(struct kvm_run *run, + uint32_t test_id) +{ + uint64_t gpa, npages, attrs; + int priv_memfd = + priv_memfd_testsuite[test_id].priv_memfd; + int ret; + int fallocate_mode; + + if (run->hypercall.nr != KVM_HC_MAP_GPA_RANGE) { + TEST_FAIL("Unhandled Hypercall %lld\n", + run->hypercall.nr); + } + + gpa = run->hypercall.args[0]; + npages = run->hypercall.args[1]; + attrs = run->hypercall.args[2]; + + if ((gpa >= TEST_MEM_GPA) && ((gpa + + (npages << MIN_PAGE_SHIFT)) <= TEST_MEM_END)) { + TEST_FAIL("Unhandled gpa 0x%lx npages %ld\n", + gpa, npages); + } + + if (attrs & KVM_MAP_GPA_RANGE_ENCRYPTED) + fallocate_mode = 0; + else { + fallocate_mode = (FALLOC_FL_PUNCH_HOLE | + FALLOC_FL_KEEP_SIZE); + } + pr_info("Converting off 0x%lx pages 0x%lx to %s\n", + (gpa - TEST_MEM_GPA), npages, + fallocate_mode ? + "shared" : "private"); + ret = fallocate(priv_memfd, fallocate_mode, + (gpa - TEST_MEM_GPA), + npages << MIN_PAGE_SHIFT); + TEST_ASSERT(ret != -1, + "fallocate failed in hc handling"); + run->hypercall.ret = 0; +} + +static void handle_vm_exit_memory_error(struct kvm_run *run, + uint32_t test_id) +{ + uint64_t gpa, size, flags; + int ret; + int priv_memfd = + priv_memfd_testsuite[test_id].priv_memfd; + int fallocate_mode; + + gpa = run->memory.gpa; + size = run->memory.size; + flags = run->memory.flags; + + if ((gpa < TEST_MEM_GPA) || ((gpa + size) + > TEST_MEM_END)) { + TEST_FAIL("Unhandled gpa 0x%lx size 0x%lx\n", + gpa, size); + } + + if (flags & KVM_MEMORY_EXIT_FLAG_PRIVATE) + fallocate_mode = 0; + else { + fallocate_mode = (FALLOC_FL_PUNCH_HOLE | + FALLOC_FL_KEEP_SIZE); + } + pr_info("Converting off 0x%lx size 0x%lx to %s\n", + (gpa - TEST_MEM_GPA), size, + fallocate_mode ? + "shared" : "private"); + ret = fallocate(priv_memfd, fallocate_mode, + (gpa - TEST_MEM_GPA), size); + TEST_ASSERT(ret != -1, + "fallocate failed in memory error handling"); +} + static void vcpu_work(struct kvm_vm *vm, uint32_t test_id) { struct kvm_run *run; @@ -155,6 +232,16 @@ static void vcpu_work(struct kvm_vm *vm, uint32_t test_id) continue; } + if (run->exit_reason == KVM_EXIT_HYPERCALL) { + handle_vm_exit_hypercall(run, test_id); + continue; + } + + if (run->exit_reason == KVM_EXIT_MEMORY_ERROR) { + handle_vm_exit_memory_error(run, test_id); + continue; + } + TEST_FAIL("Unhandled VCPU exit reason %d\n", run->exit_reason); break; }