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=-8.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=unavailable 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 17EACC47254 for ; Tue, 5 May 2020 17:12:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EA4AE206CC for ; Tue, 5 May 2020 17:12:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="QHcq/PiD" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730037AbgEERMq (ORCPT ); Tue, 5 May 2020 13:12:46 -0400 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:27660 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729857AbgEERMo (ORCPT ); Tue, 5 May 2020 13:12:44 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1588698764; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=TWi1/ExgoalyHAzreZR6yoN0Ak47l5IuTf5AyOZQ3ik=; b=QHcq/PiD+PDu+gBWxIDjjIskQrsyMTZFjfbw7HDXMxW3Ykgq01cZLwJtPfsP+ymgwsMEt2 f45JtdK4eQqd1ZZzsb3Tub+1Pm6ioj4KtpGt28J0Gi5vd6JDUDliJwnx34n5dkDhwgxDQs LPNUXrOmseRFmYhemYs+bLZBf1PfVuA= Received: from mail-wr1-f69.google.com (mail-wr1-f69.google.com [209.85.221.69]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-357-OSCpGgu2OZiPz74f_76vsA-1; Tue, 05 May 2020 13:12:40 -0400 X-MC-Unique: OSCpGgu2OZiPz74f_76vsA-1 Received: by mail-wr1-f69.google.com with SMTP id p8so1544093wrj.5 for ; Tue, 05 May 2020 10:12:40 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=TWi1/ExgoalyHAzreZR6yoN0Ak47l5IuTf5AyOZQ3ik=; b=G6T8ZFfJak59rAPKL4trpZAidMBPAgV0g2IGAFcWJZHV33vv9YTWI6H/7UrrtS6MoY RfhWqg/mH0w0GJdjNSsUG6UoNHznZdDG74JR/Rb56EpNJAbmaRrERZmYmPBPBlmjPde8 gglZpi6aYyRITuaQAyh4byzGfo+1l0quqaz4lFrPFoUDfjtgdak5WfaC3fj+JD9OLUTM R6RpAfzQx2cohmoFZcPTcRSljrSDXHrGBqiTJTMXvZCpcBLK7kZgr3SNehUTB1d3rMvd 1NbqzgvZZIjEXksi43N9Oko4ffk47JEA+RhVaF49UdTtxsU8NXq07mY2lozWfxLHXKUX wJFA== X-Gm-Message-State: AGi0PubVulhFMUnIKY3kH1MQgnGl+Hce4UfJ5h42fCcdDhxK1kIx119O Oa5hED518rVpqw9vNrDkd8Zr/FdvotOu6NKrSN4pOFTi0tLAEKAoK8ncS4T1EX4Gbgbcm1yMuEX 13wdfXII41QZ2YdJuXRGd8ghL X-Received: by 2002:adf:a297:: with SMTP id s23mr4902255wra.54.1588698759216; Tue, 05 May 2020 10:12:39 -0700 (PDT) X-Google-Smtp-Source: APiQypJ+wioukX6WMwi3IK6WjkRtFHM+jyaRgxTXMYD/QERUdMXHggoBt0hb8YQ1Vh2W9SGOmrpABw== X-Received: by 2002:adf:a297:: with SMTP id s23mr4902243wra.54.1588698759017; Tue, 05 May 2020 10:12:39 -0700 (PDT) Received: from [192.168.178.58] ([151.20.132.175]) by smtp.gmail.com with ESMTPSA id 5sm1798016wmz.16.2020.05.05.10.12.38 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 05 May 2020 10:12:38 -0700 (PDT) Subject: Re: [PATCH] KVM: X86: Declare KVM_CAP_SET_GUEST_DEBUG properly To: Peter Xu , kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Sean Christopherson , Vitaly Kuznetsov References: <20200505154750.126300-1-peterx@redhat.com> From: Paolo Bonzini Message-ID: <127c6e28-2dea-8f28-7200-2185d0d49505@redhat.com> Date: Tue, 5 May 2020 19:12:37 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: <20200505154750.126300-1-peterx@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/05/20 17:47, Peter Xu wrote: > KVM_CAP_SET_GUEST_DEBUG should be supported for x86 however it's not declared > as supported. My wild guess is that userspaces like QEMU are using "#ifdef > KVM_CAP_SET_GUEST_DEBUG" to check for the capability instead, but that could be > wrong because the compilation host may not be the runtime host. > > The userspace might still want to keep the old "#ifdef" though to not break the > guest debug on old kernels. > > Signed-off-by: Peter Xu > --- > > I also think both ppc and s390 may need similar thing, but I didn't touch them > yet because of not confident enough to cover all cases. Indeed, I'll squash this: diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index e15166b0a16d..ad2f172c26a6 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -521,6 +521,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_IOEVENTFD: case KVM_CAP_DEVICE_CTRL: case KVM_CAP_IMMEDIATE_EXIT: + case KVM_CAP_SET_GUEST_DEBUG: r = 1; break; case KVM_CAP_PPC_GUEST_DEBUG_SSTEP: diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 5dcf9ff12828..d05bb040fd42 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -545,6 +545,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_S390_AIS: case KVM_CAP_S390_AIS_MIGRATION: case KVM_CAP_S390_VCPU_RESETS: + case KVM_CAP_SET_GUEST_DEBUG: r = 1; break; case KVM_CAP_S390_HPAGE_1M: