From patchwork Tue Apr 6 08:26:38 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Emanuele Giuseppe Esposito X-Patchwork-Id: 416200 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=-15.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS 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 4A4E5C433B4 for ; Tue, 6 Apr 2021 08:26:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0D0FA613C7 for ; Tue, 6 Apr 2021 08:26:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240147AbhDFI1B (ORCPT ); Tue, 6 Apr 2021 04:27:01 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:45576 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240127AbhDFI1A (ORCPT ); Tue, 6 Apr 2021 04:27:00 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1617697612; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=70z9esMo2B49i245lsCrvtnfLxOMXAVc5hPbm8uKJwE=; b=DYV1A+dzrLPLwJktCfKlyZ52LcycmX9f/m/nJBFZVfreVGyHcY8Wvc916wC4YqRc4TT7MW 1PtHcLbxrW3TplaaNc9bJgQf9vLVQ3JYXIyHLw+98Z6KxuKxZdlsvovj6Yts6sngRMyEq4 Ui5uGK3t2T6LZG0vTMniXe8BEsy/Xkw= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-376-35f28TuHNUqwLkCHV8l62Q-1; Tue, 06 Apr 2021 04:26:51 -0400 X-MC-Unique: 35f28TuHNUqwLkCHV8l62Q-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 7723C81425A; Tue, 6 Apr 2021 08:26:49 +0000 (UTC) Received: from localhost.localdomain.com (ovpn-114-253.ams2.redhat.com [10.36.114.253]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3531C5D9E3; Tue, 6 Apr 2021 08:26:43 +0000 (UTC) From: Emanuele Giuseppe Esposito To: kvm@vger.kernel.org Cc: Paolo Bonzini , Jonathan Corbet , Sean Christopherson , Vitaly Kuznetsov , Emanuele Giuseppe Esposito , Jim Mattson , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , Shuah Khan , Alexander Graf , Andrew Jones , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH v3 0/4] KVM: cpuid: fix KVM_GET_EMULATED_CPUID implementation Date: Tue, 6 Apr 2021 10:26:38 +0200 Message-Id: <20210406082642.20115-1-eesposit@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org This series aims to clarify the behavior of the KVM_GET_EMULATED_CPUID ioctl, and fix a corner case where -E2BIG is returned when the nent field of struct kvm_cpuid2 is matching the amount of emulated entries that kvm returns. Patch 1 proposes the nent field fix to cpuid.c, patch 2 updates the ioctl documentation accordingly and patches 3 and 4 extend the x86_64/get_cpuid_test.c selftest to check the intended behavior of KVM_GET_EMULATED_CPUID. Signed-off-by: Emanuele Giuseppe Esposito Reviewed-by: Vitaly Kuznetsov --- v3: - clearer commit message and problem explanation - pre-initialize the stack variable 'entry' in __do_cpuid_func_emulated so that the various eax/ebx/ecx are initialized if not set by func. Emanuele Giuseppe Esposito (4): KVM: x86: Fix a spurious -E2BIG in KVM_GET_EMULATED_CPUID Documentation: KVM: update KVM_GET_EMULATED_CPUID ioctl description selftests: add kvm_get_emulated_cpuid to processor.h selftests: KVM: extend get_cpuid_test to include KVM_GET_EMULATED_CPUID Documentation/virt/kvm/api.rst | 10 +-- arch/x86/kvm/cpuid.c | 33 ++++--- .../selftests/kvm/include/x86_64/processor.h | 1 + .../selftests/kvm/lib/x86_64/processor.c | 33 +++++++ .../selftests/kvm/x86_64/get_cpuid_test.c | 90 ++++++++++++++++++- 5 files changed, 142 insertions(+), 25 deletions(-)