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=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 69D64C54FCE for ; Tue, 24 Mar 2020 09:43:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 43F5E2080C for ; Tue, 24 Mar 2020 09:43:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727458AbgCXJnV (ORCPT ); Tue, 24 Mar 2020 05:43:21 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:22068 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726565AbgCXJnU (ORCPT ); Tue, 24 Mar 2020 05:43:20 -0400 Received: from pps.filterd (m0098421.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 02O9ZFq3142083 for ; Tue, 24 Mar 2020 05:43:18 -0400 Received: from e06smtp03.uk.ibm.com (e06smtp03.uk.ibm.com [195.75.94.99]) by mx0a-001b2d01.pphosted.com with ESMTP id 2ywewttumc-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Tue, 24 Mar 2020 05:43:18 -0400 Received: from localhost by e06smtp03.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Tue, 24 Mar 2020 09:43:08 -0000 Received: from b06wcsmtp001.portsmouth.uk.ibm.com (b06wcsmtp001.portsmouth.uk.ibm.com [9.149.105.160]) by b06avi18626390.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 02O9g6lb42664412 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 24 Mar 2020 09:42:06 GMT Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A8557A405C; Tue, 24 Mar 2020 09:43:08 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 70B51A405B; Tue, 24 Mar 2020 09:43:07 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.145.187.35]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 24 Mar 2020 09:43:07 +0000 (GMT) Subject: Re: [PATCH v4 19/19] KVM: selftests: Add test for KVM_SET_USER_MEMORY_REGION To: Sean Christopherson Cc: James Hogan , Paul Mackerras , Janosch Frank , Paolo Bonzini , Marc Zyngier , David Hildenbrand , Cornelia Huck , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , James Morse , Julien Thierry , Suzuki K Poulose , linux-mips@vger.kernel.org, kvm-ppc@vger.kernel.org, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, Christoffer Dall , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= References: <20191217204041.10815-1-sean.j.christopherson@intel.com> <20191217204041.10815-20-sean.j.christopherson@intel.com> <20191218163958.GC25201@linux.intel.com> From: Christian Borntraeger Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <20191218163958.GC25201@linux.intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 20032409-0012-0000-0000-00000396BDEE X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20032409-0013-0000-0000-000021D3B170 Message-Id: <78b21097-52e4-b851-fc78-da3442fd0904@de.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.645 definitions=2020-03-24_02:2020-03-23,2020-03-24 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 suspectscore=2 spamscore=0 clxscore=1015 malwarescore=0 impostorscore=0 bulkscore=0 phishscore=0 mlxscore=0 adultscore=0 mlxlogscore=842 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2003240048 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 18.12.19 17:39, Sean Christopherson wrote: > On Wed, Dec 18, 2019 at 12:39:43PM +0100, Christian Borntraeger wrote: >> >> On 17.12.19 21:40, Sean Christopherson wrote: >>> Add a KVM selftest to test moving the base gfn of a userspace memory >>> region. The test is primarily targeted at x86 to verify its memslot >>> metadata is correctly updated, but also provides basic functionality >>> coverage on other architectures. >>> +static void *vcpu_worker(void *data) >>> +{ >>> + struct kvm_vm *vm = data; >>> + struct kvm_run *run; >>> + struct ucall uc; >>> + uint64_t cmd; >>> + >>> + /* >>> + * Loop until the guest is done. Re-enter the guest on all MMIO exits, >>> + * which will occur if the guest attempts to access a memslot while it >>> + * is being moved. >>> + */ >>> + run = vcpu_state(vm, VCPU_ID); >>> + do { >>> + vcpu_run(vm, VCPU_ID); >>> + } while (run->exit_reason == KVM_EXIT_MMIO); >>> + >>> + TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, >>> + "Unexpected exit reason = %d", run->exit_reason); >> >> >> This will also not work for s390. Maybe just make this test x86 specific for now? > > Doh, that's obvious in hindsight. I think the basic premise is also > broken on arm64 as it returns -EFAULT on is_error_noslot_pfn(pfn). So > yeah, x86 only for now :-( I started looking into this what it would cost to implement this on s390. s390 is also returning EFAULT if no memory slot is available. According to the doc this is not documented at all. So this part of the test vm = vm_create(VM_MODE_DEFAULT, 0, O_RDWR); vm_vcpu_add(vm, VCPU_ID); /* Fails with ENOSPC because the MMU can't create pages (no slots). */ TEST_ASSERT(_vcpu_run(vm, VCPU_ID) == -1 && errno == ENOSPC, "Unexpected error code = %d", errno); kvm_vm_free(vm); is actually just testing that the implementation for x86 does not change the error from ENOSPC to something else. The question is: do we want to document the error for the "no memslot" case and then change all existing platforms?