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Tue, 28 Apr 2026 16:05:34 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.87.85.9]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 28 Apr 2026 16:05:34 +0000 (GMT) From: Steffen Eiden To: kvm@vger.kernel.org, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Cc: Andreas Grapentin , Arnd Bergmann , Catalin Marinas , Christian Borntraeger , Claudio Imbrenda , David Hildenbrand , Gautam Gala , Hendrik Brueckner , Janosch Frank , Joey Gouly , Marc Zyngier , Nina Schoetterl-Glausch , Oliver Upton , Paolo Bonzini , Suzuki K Poulose , Ulrich Weigand , Will Deacon , Zenghui Yu Subject: [RFC PATCH v2 19/28] KVM: Remove KVM_MMIO as config option Date: Tue, 28 Apr 2026 18:05:16 +0200 Message-ID: <20260428160527.1378085-20-seiden@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260428160527.1378085-1-seiden@linux.ibm.com> References: <20260428160527.1378085-1-seiden@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=AqDeGu9P c=1 sm=1 tr=0 ts=69f0dad3 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VnNF1IyMAAAA:8 a=8UI0e4M0uH3UOGHAWE8A:9 a=9IkURH4LAGRwoN1D:21 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDI4MDE1MSBTYWx0ZWRfX8bY3K3WY6tL3 xJgK5+V75xM0XSF0x/xykk2T1+oC+tbHkOBX00Ib3kKstKzd/SgcdhrqBS0MH0bBsGzKMIwqloD TNY9bV/V+MwMuLf76OWjYWMt9/acqCnOb/5JZYMQTfs7U0lWqLcr7W9xhbEMWWBvHHfzZVrcqDP 5FVFH1gs3NgNROPdgt5K+Nlp3qOkink+BNjKbtsAgRPh8QCU/TcjO3EaiP5DYzwEafvhtzzKJln FpNkCzl8wBpcdPOUEm+c7i7ZvX5qVSpENT4k3AWkLDOlwEOvW9LbDrrYaBGostdT3Dt7Sqhx5m5 a/ZlBdUs1bN9D1W7vyaL/MdITD2vGPKKKKfbyRaKcoph06B2ojpKLR+KwdLR8GtB/HMOiekswie Im2ctVTpvesWDCDnFdCs+M5z5E1vQjKnxI8M1x7iW1fx/wnbfTWwXXpsAP9loS4vysatE5np84A USLhWIifJDhn9wdqi+A== X-Proofpoint-GUID: JPnq-OzEFugEwhTW-XrAq9303mfwtdVm X-Proofpoint-ORIG-GUID: JPnq-OzEFugEwhTW-XrAq9303mfwtdVm X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-28_05,2026-04-28_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 priorityscore=1501 phishscore=0 suspectscore=0 clxscore=1015 lowpriorityscore=0 spamscore=0 bulkscore=0 impostorscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2604280151 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260428_090551_409172_AC9913EE X-CRM114-Status: GOOD ( 20.02 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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. Suggested-by: Nina Schoetterl-Glausch Signed-off-by: Steffen Eiden --- arch/arm64/include/asm/kvm_host.h | 2 ++ arch/arm64/kvm/Kconfig | 1 - arch/loongarch/include/asm/kvm_host.h | 2 ++ arch/loongarch/kvm/Kconfig | 1 - arch/mips/include/asm/kvm_host.h | 2 ++ arch/mips/kvm/Kconfig | 1 - arch/powerpc/include/asm/kvm_host.h | 7 +++++++ arch/powerpc/kvm/Kconfig | 4 ---- arch/riscv/include/asm/kvm_host.h | 2 ++ arch/riscv/kvm/Kconfig | 1 - arch/x86/include/asm/kvm_host.h | 2 ++ arch/x86/kvm/Kconfig | 1 - include/linux/kvm_host.h | 2 +- virt/kvm/Kconfig | 3 --- virt/kvm/Makefile.kvm | 3 +-- virt/kvm/coalesced_mmio.c | 3 +++ virt/kvm/coalesced_mmio.h | 2 +- virt/kvm/kvm_main.c | 8 ++++---- 18 files changed, 27 insertions(+), 20 deletions(-) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index e3a2ac3979ac..39630e235a36 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -33,6 +33,8 @@ #define KVM_HALT_POLL_NS_DEFAULT 500000 +#define HAVE_KVM_MMIO + #include #include #include diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig index 7d1f22fd490b..4761b5e7e75b 100644 --- a/arch/arm64/kvm/Kconfig +++ b/arch/arm64/kvm/Kconfig @@ -22,7 +22,6 @@ menuconfig KVM select KVM_COMMON select KVM_GENERIC_HARDWARE_ENABLING select HAVE_KVM_CPU_RELAX_INTERCEPT - select KVM_MMIO select KVM_GENERIC_DIRTYLOG_READ_PROTECT select VIRT_XFER_TO_GUEST_WORK select KVM_VFIO diff --git a/arch/loongarch/include/asm/kvm_host.h b/arch/loongarch/include/asm/kvm_host.h index 19eb5e5c3984..392e14302453 100644 --- a/arch/loongarch/include/asm/kvm_host.h +++ b/arch/loongarch/include/asm/kvm_host.h @@ -26,6 +26,8 @@ #define __KVM_HAVE_ARCH_INTC_INITIALIZED +#define HAVE_KVM_MMIO + /* Loongarch KVM register ids */ #define KVM_GET_IOC_CSR_IDX(id) ((id & KVM_CSR_IDX_MASK) >> LOONGARCH_REG_SHIFT) #define KVM_GET_IOC_CPUCFG_IDX(id) ((id & KVM_CPUCFG_IDX_MASK) >> LOONGARCH_REG_SHIFT) diff --git a/arch/loongarch/kvm/Kconfig b/arch/loongarch/kvm/Kconfig index 8e5213609975..a244f2aea7ff 100644 --- a/arch/loongarch/kvm/Kconfig +++ b/arch/loongarch/kvm/Kconfig @@ -28,7 +28,6 @@ config KVM select KVM_COMMON select KVM_GENERIC_DIRTYLOG_READ_PROTECT select KVM_GENERIC_HARDWARE_ENABLING - select KVM_MMIO select VIRT_XFER_TO_GUEST_WORK select SCHED_INFO select GUEST_PERF_EVENTS if PERF_EVENTS diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h index c14b10821817..e3cb7c8c9461 100644 --- a/arch/mips/include/asm/kvm_host.h +++ b/arch/mips/include/asm/kvm_host.h @@ -26,6 +26,8 @@ #include +#define HAVE_KVM_MMIO + /* MIPS KVM register ids */ #define MIPS_CP0_32(_R, _S) \ (KVM_REG_MIPS_CP0 | KVM_REG_SIZE_U32 | (8 * (_R) + (_S))) diff --git a/arch/mips/kvm/Kconfig b/arch/mips/kvm/Kconfig index b1b9a1d67758..c65596fdf54f 100644 --- a/arch/mips/kvm/Kconfig +++ b/arch/mips/kvm/Kconfig @@ -22,7 +22,6 @@ config KVM select EXPORT_UASM select KVM_COMMON select KVM_GENERIC_DIRTYLOG_READ_PROTECT - select KVM_MMIO select KVM_GENERIC_HARDWARE_ENABLING select HAVE_KVM_READONLY_MEM help diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index 2d139c807577..92d14438e31b 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -29,6 +29,13 @@ #define __KVM_HAVE_ARCH_VCPU_DEBUGFS +#if defined(CONFIG_KVM_BOOK3S_32_HANDLER) || \ + defined(CONFIG_KVM_BOOK3S_PR_POSSIBLE) || \ + defined(CONFIG_KVM_E500V2) || \ + defined(CONFIG_KVM_E500MC) +#define HAVE_KVM_MMIO +#endif + #define KVM_MAX_VCPUS NR_CPUS #define KVM_MAX_VCORES NR_CPUS diff --git a/arch/powerpc/kvm/Kconfig b/arch/powerpc/kvm/Kconfig index 9a0d1c1aca6c..d97a4a51ec55 100644 --- a/arch/powerpc/kvm/Kconfig +++ b/arch/powerpc/kvm/Kconfig @@ -29,7 +29,6 @@ config KVM_BOOK3S_HANDLER config KVM_BOOK3S_32_HANDLER bool select KVM_BOOK3S_HANDLER - select KVM_MMIO config KVM_BOOK3S_64_HANDLER bool @@ -37,7 +36,6 @@ config KVM_BOOK3S_64_HANDLER config KVM_BOOK3S_PR_POSSIBLE bool - select KVM_MMIO config KVM_BOOK3S_HV_POSSIBLE bool @@ -200,7 +198,6 @@ config KVM_E500V2 depends on PPC_E500 && !PPC_E500MC depends on !CONTEXT_TRACKING_USER select KVM - select KVM_MMIO help Support running unmodified E500 guest kernels in virtual machines on E500v2 host processors. @@ -215,7 +212,6 @@ config KVM_E500MC depends on PPC_E500MC depends on !CONTEXT_TRACKING_USER select KVM - select KVM_MMIO select KVM_BOOKE_HV help Support running unmodified E500MC/E5500/E6500 guest kernels in diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm_host.h index 24585304c02b..a405cd30c6fa 100644 --- a/arch/riscv/include/asm/kvm_host.h +++ b/arch/riscv/include/asm/kvm_host.h @@ -25,6 +25,8 @@ #include #include +#define HAVE_KVM_MMIO + #define KVM_MAX_VCPUS 1024 #define KVM_HALT_POLL_NS_DEFAULT 500000 diff --git a/arch/riscv/kvm/Kconfig b/arch/riscv/kvm/Kconfig index ec2cee0a39e0..3aea8d4939d2 100644 --- a/arch/riscv/kvm/Kconfig +++ b/arch/riscv/kvm/Kconfig @@ -28,7 +28,6 @@ config KVM select KVM_COMMON select KVM_GENERIC_DIRTYLOG_READ_PROTECT select KVM_GENERIC_HARDWARE_ENABLING - select KVM_MMIO select VIRT_XFER_TO_GUEST_WORK select SCHED_INFO select GUEST_PERF_EVENTS if PERF_EVENTS diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 6e4e3ef9b8c7..4cdaf60c9217 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -45,6 +45,8 @@ #define __KVM_HAVE_ARCH_VCPU_DEBUGFS +#define HAVE_KVM_MMIO + /* * CONFIG_KVM_MAX_NR_VCPUS is defined iff CONFIG_KVM!=n, provide a dummy max if * KVM is disabled (arbitrarily use the default from CONFIG_KVM_MAX_NR_VCPUS). diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig index 801bf9e520db..da5d9fa8a11c 100644 --- a/arch/x86/kvm/Kconfig +++ b/arch/x86/kvm/Kconfig @@ -32,7 +32,6 @@ config KVM_X86 select VHOST_TASK select KVM_ASYNC_PF select USER_RETURN_NOTIFIER - select KVM_MMIO select SCHED_INFO select PERF_EVENTS select GUEST_PERF_EVENTS diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 44e6fe3d2d80..2aeda4c6af14 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -833,7 +833,7 @@ struct kvm { struct list_head ioeventfds; struct kvm_vm_stat stat; struct kvm_arch arch; -#ifdef CONFIG_KVM_MMIO +#ifdef HAVE_KVM_MMIO struct kvm_coalesced_mmio_ring *coalesced_mmio_ring; spinlock_t ring_lock; struct list_head coalesced_zones; diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig index 794976b88c6f..c4a983e41765 100644 --- a/virt/kvm/Kconfig +++ b/virt/kvm/Kconfig @@ -40,9 +40,6 @@ config NEED_KVM_DIRTY_RING_WITH_BITMAP bool depends on HAVE_KVM_DIRTY_RING -config KVM_MMIO - bool - config KVM_ASYNC_PF bool diff --git a/virt/kvm/Makefile.kvm b/virt/kvm/Makefile.kvm index d047d4cf58c9..3c27c18b49a0 100644 --- a/virt/kvm/Makefile.kvm +++ b/virt/kvm/Makefile.kvm @@ -5,9 +5,8 @@ KVM ?= ../../../virt/kvm -kvm-y := $(KVM)/kvm_main.o $(KVM)/eventfd.o $(KVM)/binary_stats.o +kvm-y := $(KVM)/kvm_main.o $(KVM)/eventfd.o $(KVM)/binary_stats.o $(KVM)/coalesced_mmio.o kvm-$(CONFIG_KVM_VFIO) += $(KVM)/vfio.o -kvm-$(CONFIG_KVM_MMIO) += $(KVM)/coalesced_mmio.o kvm-$(CONFIG_KVM_ASYNC_PF) += $(KVM)/async_pf.o kvm-$(CONFIG_HAVE_KVM_IRQ_ROUTING) += $(KVM)/irqchip.o kvm-$(CONFIG_HAVE_KVM_DIRTY_RING) += $(KVM)/dirty_ring.o diff --git a/virt/kvm/coalesced_mmio.c b/virt/kvm/coalesced_mmio.c index 6b1d90161099..070eba3c6534 100644 --- a/virt/kvm/coalesced_mmio.c +++ b/virt/kvm/coalesced_mmio.c @@ -12,6 +12,8 @@ #include #include + +#ifdef HAVE_KVM_MMIO #include #include @@ -188,3 +190,4 @@ int kvm_vm_ioctl_unregister_coalesced_mmio(struct kvm *kvm, */ return 0; } +#endif /* ifdef HAVE_KVM_MMIO */ diff --git a/virt/kvm/coalesced_mmio.h b/virt/kvm/coalesced_mmio.h index 36f84264ed25..a8430d41945b 100644 --- a/virt/kvm/coalesced_mmio.h +++ b/virt/kvm/coalesced_mmio.h @@ -11,7 +11,7 @@ * */ -#ifdef CONFIG_KVM_MMIO +#ifdef HAVE_KVM_MMIO #include diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 60a5bb778993..ab3a0347bdd3 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -4041,7 +4041,7 @@ static vm_fault_t kvm_vcpu_fault(struct vm_fault *vmf) else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) page = virt_to_page(vcpu->arch.pio_data); #endif -#ifdef CONFIG_KVM_MMIO +#ifdef HAVE_KVM_MMIO else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); #endif @@ -4867,7 +4867,7 @@ static int kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg) case KVM_CAP_ENABLE_CAP_VM: case KVM_CAP_HALT_POLL: return 1; -#ifdef CONFIG_KVM_MMIO +#ifdef HAVE_KVM_MMIO case KVM_CAP_COALESCED_MMIO: return KVM_COALESCED_MMIO_PAGE_OFFSET; case KVM_CAP_COALESCED_PIO: @@ -5208,7 +5208,7 @@ static long kvm_vm_ioctl(struct file *filp, break; } #endif -#ifdef CONFIG_KVM_MMIO +#ifdef HAVE_KVM_MMIO case KVM_REGISTER_COALESCED_MMIO: { struct kvm_coalesced_mmio_zone zone; @@ -5530,7 +5530,7 @@ static long kvm_dev_ioctl(struct file *filp, #ifdef CONFIG_X86 r += PAGE_SIZE; /* pio data page */ #endif -#ifdef CONFIG_KVM_MMIO +#ifdef HAVE_KVM_MMIO r += PAGE_SIZE; /* coalesced mmio ring page */ #endif break; -- 2.51.0