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Wed, 2 Sep 2026 07:50:29 +0000 (GMT) Date: Wed, 2 Sep 2026 09:50:28 +0200 From: Steffen Eiden To: Sean Christopherson Cc: kvm@vger.kernel.org, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, Alexander Gordeev , Andreas Grapentin , Arnd Bergmann , Catalin Marinas , Christian Borntraeger , Claudio Imbrenda , David Hildenbrand , Friedrich Welter , Fuad Tabba , Gautam Gala , Hariharan Mari , Heiko Carstens , Hendrik Brueckner , Ilya Leoshkevich , Janosch Frank , Joey Gouly , Marc Zyngier , Nico Boehr , Nina Schoetterl-Glausch , Oliver Upton , Paolo Bonzini , Suzuki K Poulose , Sven Schnelle , Ulrich Weigand , Vasily Gorbik , Will Deacon , Zenghui Yu Subject: Re: [PATCH v7 02/23] KVM: Make device name configurable Message-ID: <20260902075028.231001-D-seiden@linux.ibm.com> References: <20260831144802.834315-1-seiden@linux.ibm.com> <20260831144802.834315-3-seiden@linux.ibm.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-GUID: QF-vG4BX5O9Aa6yStpepOuZKOE1eMyna X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTAyMDA2NiBTYWx0ZWRfX1WgqhhycMSVK s9TTuZZWkFfejSZv8rcgEHtbfySdP1FbI2p6sJ8lf5UVjmD8xtSeQqaeDIqhpm9AVi+eqreLCNK 4NketVL6IBOqKHZVZK7uoJ/i/fUxsq9WruPKIFlD9cV5ZERHZlK8U9zG+koiOWfJThl/IhB+nbT /Rc0IBpB4uNoE84/ri3yNtDGCRrFRohts+Pg1taTifUVd3caqvrjDY2YmpHY7bkC3h63yqWIUb/ HkzhLaJ2/cHPbe2q8fwvqi3DEGaLvPCNfOOxj486T6+LjcmcAorE11Azhw4V/UpSbbGjSEcgC3M TRN/62A6OrgQFJO03bzM9GTPBwVh44lYo7lv3Hq8a3AktmUl5JK798ONiVDo5kGzyaPDGmaI22Q q81Lcz+GoV6EfyB/m554pLNSJRJ7W7ya8LvwPZSUejGoMdeJMiQvPt4+5MfiKHst15fPHlIrrZy YK+63sLTYofdlCVPePw== X-Proofpoint-ORIG-GUID: fANCLW2A9Trn8myBhZjBZVyvyTFzAB3n X-Proofpoint-Spam-Info: AW1haW4tMjYwOTAyMDA2NiBTYWx0ZWRfX33hdZLrCOFfK OQQ8toNI0ozMn9YS4Mm21FSWxILdLLBVkjZ4MI6+sOMJ0hLlup1Gs4BYycC/uA3Vpv8med2wOms WjXkSL8iPba98ZH72g14RM4AVVTRDBk= X-Authority-Analysis: v=2.4 cv=B92JFutM c=1 sm=1 tr=0 ts=6a97d54c cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=kj9zAlcOel0A:10 a=VdqzKS8jKosA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=_EcWKeZr55_4eD5WYHIA:9 a=CjuIK1q_8ugA:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-02_01,2026-09-01_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 spamscore=0 clxscore=1015 suspectscore=0 phishscore=0 lowpriorityscore=0 bulkscore=0 priorityscore=1501 impostorscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2609020066 On Tue, Sep 01, 2026 at 05:40:25PM -0700, Sean Christopherson wrote: > On Mon, Aug 31, 2026, Steffen Eiden wrote: > > Allow KVM implementations to choose alternative device names. This is > > especially useful for architectures providing multiple KVM > > implementations simultaneously. Architectures providing multiple KVM > > implementations must compile the KVM common code once per > > implementation and mange symbols. > > What about tracepoints? Or do those show up as "kvm" and "kvm-arm64"? Yes, I want them to show up as kvm and kvm-arm64. Thanks for pointing that out - I just noticed that I forgot to switch the trace system to kvm-arm64 for the common tracepoints in trace/events/kvm.h I only did it for the arch-local traces in PATCH 21. I would just do the following: diff --git a/include/trace/events/kvm.h b/include/trace/events/kvm.h index b282e3a86769..5d4f8a0693a3 100644 --- a/include/trace/events/kvm.h +++ b/include/trace/events/kvm.h @@ -5,7 +5,11 @@ #include #undef TRACE_SYSTEM +#ifdef KVM_S390_ARM64 +#define TRACE_SYSTEM kvm-arm64 +#else #define TRACE_SYSTEM kvm +#endif /* KVM_S390_ARM64 */ #define ERSN(x) { KVM_EXIT_##x, "KVM_EXIT_" #x } This would leak a bit of arm on s390 into common KVM but I do not see another way. KVM_S390_ARM64 is defined for all arm-on-s390 compile units. I think I'll add this in PATCH 14? of this series or create a separate PATCH. Does this make sense? Steffen