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Fri, 10 Jul 2026 08:54:44 +0000 (GMT) Received: from osiris (unknown [9.87.147.219]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTPS; Fri, 10 Jul 2026 08:54:43 +0000 (GMT) Date: Fri, 10 Jul 2026 10:54:42 +0200 From: Steffen Eiden To: Marc Zyngier 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 , Gautam Gala , Hariharan Mari , Heiko Carstens , Hendrik Brueckner , Ilya Leoshkevich , Janosch Frank , Joey Gouly , 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 v4 05/27] KVM: Remove KVM_MMIO as config option Message-ID: <20260710085442.984749-E-seiden@linux.ibm.com> References: <20260706085229.979525-1-seiden@linux.ibm.com> <20260706085229.979525-6-seiden@linux.ibm.com> <87a4s37scc.wl-maz@kernel.org> Precedence: bulk X-Mailing-List: linux-s390@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: <87a4s37scc.wl-maz@kernel.org> X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=Q/XiJY2a c=1 sm=1 tr=0 ts=6a50b35c cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=kj9zAlcOel0A:10 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=VnNF1IyMAAAA:8 a=9pq-tb42-J4kxd0kViUA:9 a=CjuIK1q_8ugA:10 X-Proofpoint-GUID: wM388sXXjnjG4_TIOd2ildNFbThmqmSd X-Proofpoint-ORIG-GUID: wM388sXXjnjG4_TIOd2ildNFbThmqmSd X-Proofpoint-Spam-Info: AW1haW4tMjYwNzEwMDA4NSBTYWx0ZWRfXxGXLvy3r34pv 2y3rXeOF17UYrpTG1ZMCkfV+BaHFzFD97Qu+UJoguBttolXd/3SdBkI3dtFYW1gi9hsAr/6b+Ou 6ppDN13fVX0ETlOUQQlHey/Isj23Jk0= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzEwMDA4NSBTYWx0ZWRfX3CFc8mLUo+4u CIYnQElsV3jjWye2hGYjlrMeeLPTvVgLyjSb7KwYSsEc4mE5GvP28T0ObIxEPQ90bOpDcnNvJox IvT2tGBZQiqPu90wCVjhGTpTE0oxdZML6bcTbd1Png+6TvbUuVJRJXc6fBghjx3xRlDIY+N6ajE 0pS6iPYow7kzyjq7FaCZ87RO6zAMaq5duZgDd20bBNyGmLZKSj89yzsKWjwYXSnnDtBeprqQlAe wFDQDDWEYaw1U/aPxtjVjQMK91Kq0Esiy9UqBBFJh8GvhFArW++x6nsyEHpkulsaGtpYfhv/9JE WYY5baWDCUYDpnOtjZDD+InFgnkteq2kVj9DMnWP3KDJf6mp4wB0GwK2OXg/lSgjfcxpqw5DRLp EedaSKfiOVE/jEzH9Z5oU9y5YtCDRRF15Em/72dmPHFEnZpt8tAThxGrBU+tIr9lXMqc/Rd52B3 J0XD42UBOQrx8e4SWlg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-10_02,2026-07-09_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 impostorscore=0 spamscore=0 phishscore=0 priorityscore=1501 bulkscore=0 clxscore=1015 lowpriorityscore=0 suspectscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607100085 On Mon, Jul 06, 2026 at 09:53:23PM +0100, Marc Zyngier wrote: > On Mon, 06 Jul 2026 09:52:05 +0100, > Steffen Eiden wrote: > > > > Defining KVM_MMIO is not flexible enough for multi-KVM systems with > > different Kconfig options regarding KVM_MMIO. Therefore, remove KVM_MMIO > > from the config space and use the macro HAVE_KVM_MMIO instead. > > > > Given that there is only one KVM architecture that doesn't use > KVM_MMIO, it feels like the polarity of this symbol is the wrong way > around. > > Something like KVM_NO_MMIO, only exposed by S390 for its native > support, should significantly reduce the churn. Makes sense. I'll add KVM_NO_MMIO and conitionally compile based on the config and not havng this symbol Steffen