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Tue, 13 Oct 2026 07:50:18 +0000 (GMT) Received: from osiris (unknown [9.224.76.185]) by smtpav01.fra02v.mail.ibm.com (Postfix) with ESMTPS; Tue, 13 Oct 2026 07:50:18 +0000 (GMT) Date: Tue, 13 Oct 2026 09:50:17 +0200 From: Steffen Eiden To: Paolo Bonzini 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 , Sean Christopherson , Suzuki K Poulose , Sven Schnelle , Ulrich Weigand , Vasily Gorbik , Will Deacon , Zenghui Yu Subject: Re: [PATCH v9 02/24] KVM: Move architecture capability Kconfigs to header defines Message-ID: <20261013075017.696560-A-seiden@linux.ibm.com> References: <20260930173441.66762-1-seiden@linux.ibm.com> <20260930173441.66762-3-seiden@linux.ibm.com> <26b2c514-de23-4c70-81c8-875f8e8c094a@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@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: <26b2c514-de23-4c70-81c8-875f8e8c094a@redhat.com> X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Info: AW1haW4tMjYxMDEzMDAzMCBTYWx0ZWRfXyw5R7W3K3BrL LZS0Mygj1AmZeZcOQIxEbDCCTSV4YFnb+GKWecnNfkUmq8HHze6IZ3FC6JyEWjkgK/9ULemrzr4 h1p8WEQGtHlHPTaqpAYsPkasUz9/rdU= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDEzMDAzMCBTYWx0ZWRfX+r51WcVgennW 1W5+Csfo13ax9IUXhhZDpqG3+qQTSbWxgs0E+z1KGhGCAwQl8QpaQjD5akVGj2QHYo5w9hgan+z 0AKFKcE0yUv12a9dBfnmFMDshMhB38S3L8wWxivkvit2xvOmXqopiNZ/M5OsfZ12Rfn2cvF9Rik blDH9L6pdeQeE+k2gV7uSDaz8J7L5Qs/z/nJ+mp2K8eKDgfljuw0IO3PSWx/8vna76dJvxvl0kl 5m7vjOtfXAI32BhTBhXxYHd0f6CV4L3oM/GK2Uvl9fU/tze9zgu8RRLxlkDYynI/ItlY92oKjml 4L41SFPnBUqqgsnztOzmbL3BGTJKSS14uwZcj9W2gteqQ4DH5XmPc/ARTQxQGvAMNHpSlxtgUTY em45iQ68HXwQKpZB4m/Dusx6odXwsGkVwvBYBZd9fRRVtncyNDwSe7CO2f4UOovxo7YgouQaRHV YhAGaYl09ZrmTulXl5w== X-Authority-Analysis: v=2.4 cv=E6pYNqdl c=1 sm=1 tr=0 ts=6acde2c1 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=kj9zAlcOel0A:10 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=LolK8cCbLh9hbZZaMMsA:9 a=CjuIK1q_8ugA:10 X-Proofpoint-ORIG-GUID: kRfiUjtPbLtTGxyBHkSxxPdk_XR8hKaj X-Proofpoint-GUID: 8usMhobHWWRXOQdsRqavwz8LGCbzNUF6 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=2026-10-13_01,2026-10-09_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 phishscore=0 clxscore=1015 bulkscore=0 priorityscore=1501 spamscore=0 adultscore=0 suspectscore=0 malwarescore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610080000 definitions=main-2610130030 On Mon, Oct 12, 2026 at 07:53:43PM +0200, Paolo Bonzini wrote: > On 9/30/26 19:34, Steffen Eiden wrote: > > Historically, KVM feature opt-ins and callbacks were configured globally > > via Kconfig symbols (CONFIG_HAVE_KVM_* and CONFIG_KVM_*). > > Not all of them - there are many __KVM_HAVE_* symbols already. In > particular now there's both KVM_MSI and __KVM_HAVE_MSI/__KVM_HAVE_MSIX (but > the latter is dead, so I have sent a patch to remove it). > > There are several remaining CONFIG_HAVE_KVM_ARCH_* Kconfig symbols as well. > That's okay, but it should be noted in the changelog that not all symbols > were fixed. > > Can you at least quickly provide a v2, that changes all symbols to > __KVM_HAVE_ (and when not applicable __KVM_*, for example > __KVM_HAVE_READONLY_MEM)? I have already changed KVM_NO_MMIO to > __KVM_NO_MMIO in kvm/queue. > Yes, no problem. Using this pattern would reintroduce __KVM_HAVE_MSI then, right? I would create those symbols: - __KVM_HAVE_INVALID_WAKEUPS (formerly KVM_INVALID_WAKEUPS) - __KVM_HAVE_MSI (formerly HAVE_KVM_MSI) - __KVM_HAVE_NO_POLL (formerly HAVE_KVM_NO_POLL) - __KVM_HAVE_READONLY_MEM (formerly HAVE_KVM_READONLY_MEM) - __KVM_HAVE_VCPU_RUN_PID_CHANGE (formerly HAVE_KVM_VCPU_RUN_PID_CHANGE) OK? Steffen > Thanks, > > Paolo > > > Replace these global Kconfig options with architecture-specific opt-in > > defines in and standardize their naming by dropping the > > HAVE_ prefix: > > - KVM_INVALID_WAKEUPS > > - KVM_MSI (formerly HAVE_KVM_MSI) > > - KVM_NO_POLL (formerly HAVE_KVM_NO_POLL) > > - KVM_READONLY_MEM (formerly HAVE_KVM_READONLY_MEM) > > - KVM_VCPU_RUN_PID_CHANGE (formerly HAVE_KVM_VCPU_RUN_PID_CHANGE) > > > > This allows each architecture and guest implementation to configure its > > supported capabilities independently in its kvm_host header and eliminates > > unnecessary fallback stubs across different KVM targets. > > > > Signed-off-by: Steffen Eiden