From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoffer Dall Subject: Re: [PATCH v2 04/10] KVM: arm: guest debug, add stub KVM_SET_GUEST_DEBUG ioctl Date: Mon, 13 Apr 2015 14:12:31 +0200 Message-ID: <20150413121231.GO6186@cbox> References: <1427814488-28467-1-git-send-email-alex.bennee@linaro.org> <1427814488-28467-5-git-send-email-alex.bennee@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Return-path: Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 68FE04C3CB for ; Mon, 13 Apr 2015 08:04:41 -0400 (EDT) Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id gtqnAxuzPkFi for ; Mon, 13 Apr 2015 08:04:40 -0400 (EDT) Received: from mail-lb0-f173.google.com (mail-lb0-f173.google.com [209.85.217.173]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 277CB4C3C6 for ; Mon, 13 Apr 2015 08:04:39 -0400 (EDT) Received: by lbcga7 with SMTP id ga7so56916316lbc.1 for ; Mon, 13 Apr 2015 05:12:25 -0700 (PDT) Content-Disposition: inline In-Reply-To: <1427814488-28467-5-git-send-email-alex.bennee@linaro.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu To: Alex =?iso-8859-1?Q?Benn=E9e?= Cc: Russell King , kvm@vger.kernel.org, Jonathan Corbet , marc.zyngier@arm.com, jan.kiszka@siemens.com, "open list:DOCUMENTATION" , open list , dahi@linux.vnet.ibm.com, zhichao.huang@linaro.org, r65777@freescale.com, pbonzini@redhat.com, bp@suse.de, Gleb Natapov , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org List-Id: kvmarm@lists.cs.columbia.edu On Tue, Mar 31, 2015 at 04:08:02PM +0100, Alex Benn=E9e wrote: > This commit adds a stub function to support the KVM_SET_GUEST_DEBUG > ioctl. Currently any operation flag will return EINVAL. Actual > functionality will be added with further patches. > = > Signed-off-by: Alex Benn=E9e . > = > --- > v2 > - simplified form of the ioctl (stuff will go into setup_debug) > = > diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kv= m/api.txt > index b112efc..06c5064 100644 > --- a/Documentation/virtual/kvm/api.txt > +++ b/Documentation/virtual/kvm/api.txt > @@ -2604,7 +2604,7 @@ handled. > 4.87 KVM_SET_GUEST_DEBUG > = > Capability: KVM_CAP_SET_GUEST_DEBUG > -Architectures: x86, s390, ppc > +Architectures: x86, s390, ppc, arm64 > Type: vcpu ioctl > Parameters: struct kvm_guest_debug (in) > Returns: 0 on success; -1 on error > diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c > index 5560f74..445933d 100644 > --- a/arch/arm/kvm/arm.c > +++ b/arch/arm/kvm/arm.c > @@ -183,6 +183,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, lon= g ext) > case KVM_CAP_ARM_PSCI: > case KVM_CAP_ARM_PSCI_0_2: > case KVM_CAP_READONLY_MEM: > + case KVM_CAP_SET_GUEST_DEBUG: > r =3D 1; > break; shouldn't you wait with advertising this capability until you've implemented support for it? Thanks, -Christoffer