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Tue, 28 Apr 2026 16:05:32 +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 16:05:32 +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 13/28] KVM: arm64: Extract & share ipa size shift calculation Date: Tue, 28 Apr 2026 18:05:10 +0200 Message-ID: <20260428160527.1378085-14-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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: ky7bbT1OsSx3d4qG0f90nGSzDqtgJmm9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDI4MDE1MSBTYWx0ZWRfX/pc1ACEFtLlK c+EXYAz+Xfqutreo4dQC7nQaRaNqJnDHdZCy8GbbK6iwbP1njAevZ8LzooFQMAgM5hr8YKGgocZ GzdKT4GXdnKCmrf+pPTVKHmUbhOjY1qqE861j5aTecqbiWw1YJ1uP4s51D0zdBFsJyg97U7U5cN D9WwotzLhFPe1SaCz8KMiGDn9Y/wL0vfBtMVowUeo9fhTjxkuBnUs4wD0wYYvYtLStRVATBLVYP gepkLHpWBhH3sESTVZTm7uLLB1Fdjue20Vst7F0DiICx1tjGwPnP29KroUFfmoImnEQZn5B+5xo qPqYumpIS4X9CYNnLu7tD9FMSYh0P3nQ+lwdrhmbU1qwWt9SfBo1f+qwOybvzAQvy0q72zv1TVh zKY1QcKGcHrfSKtXkjtiuDXZNsbY8qv3Sq1ui3OTaG7PQbOo9PTnWq+8gNjA5aKtKcw7il8HmcE 7Dxb4dGDocjS9ayofnQ== X-Authority-Analysis: v=2.4 cv=VZLH+lp9 c=1 sm=1 tr=0 ts=69f0dad1 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VnNF1IyMAAAA:8 a=MB2ALdkwiJlipvWvu_wA:9 X-Proofpoint-GUID: ky7bbT1OsSx3d4qG0f90nGSzDqtgJmm9 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 clxscore=1015 suspectscore=0 adultscore=0 lowpriorityscore=0 phishscore=0 spamscore=0 malwarescore=0 bulkscore=0 priorityscore=1501 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2604280151 Extract the ipa shift calculation from kvm_init_ipa_range into its own function kvm_vm_type_ipa_size_shift to be shared across architectures. User space passes a type parameter to the VM creation ioctl, indicating the physical size of the VM. Therefore extract the ipa shift calculation from kvm_init_ipa_range into its own function kvm_vm_type_ipa_size_shift, so all implementers of arm64 KVM can make use of it for VM creation. Co-developed-by: Nina Schoetterl-Glausch Signed-off-by: Nina Schoetterl-Glausch Signed-off-by: Steffen Eiden --- arch/arm64/kvm/mmu.c | 19 ++++++------------- include/kvm/arm64/kvm_host.h | 1 + virt/kvm/arm64/arm.c | 21 +++++++++++++++++++++ 3 files changed, 28 insertions(+), 13 deletions(-) diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index e19ff77b3cd5..bec52291bc0c 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -874,27 +874,20 @@ static struct kvm_pgtable_mm_ops kvm_s2_mm_ops = { static int kvm_init_ipa_range(struct kvm_s2_mmu *mmu, unsigned long type) { - u32 kvm_ipa_limit = get_kvm_ipa_limit(); u64 mmfr0, mmfr1; u32 phys_shift; + int r; if (type & ~KVM_VM_TYPE_ARM_IPA_SIZE_MASK) return -EINVAL; - phys_shift = KVM_VM_TYPE_ARM_IPA_SIZE(type); if (is_protected_kvm_enabled()) { - phys_shift = kvm_ipa_limit; - } else if (phys_shift) { - if (phys_shift > kvm_ipa_limit || - phys_shift < ARM64_MIN_PARANGE_BITS) - return -EINVAL; + phys_shift = get_kvm_ipa_limit(); } else { - phys_shift = KVM_PHYS_SHIFT; - if (phys_shift > kvm_ipa_limit) { - pr_warn_once("%s using unsupported default IPA limit, upgrade your VMM\n", - current->comm); - return -EINVAL; - } + r = kvm_vm_type_ipa_size_shift(type); + if (r < 0) + return r; + phys_shift = r; } mmfr0 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1); diff --git a/include/kvm/arm64/kvm_host.h b/include/kvm/arm64/kvm_host.h index d36ebea4d60f..8bf399508757 100644 --- a/include/kvm/arm64/kvm_host.h +++ b/include/kvm/arm64/kvm_host.h @@ -33,6 +33,7 @@ int kvm_vcpu_init_check_features(struct kvm_vcpu *vcpu, const struct kvm_vcpu_init *init); bool kvm_vcpu_init_changed(struct kvm_vcpu *vcpu, const struct kvm_vcpu_init *init); +int kvm_vm_type_ipa_size_shift(unsigned long type); /* MMIO helpers */ void kvm_mmio_write_buf(void *buf, unsigned int len, unsigned long data); diff --git a/virt/kvm/arm64/arm.c b/virt/kvm/arm64/arm.c index b47adef65e5f..0bbfbe63e558 100644 --- a/virt/kvm/arm64/arm.c +++ b/virt/kvm/arm64/arm.c @@ -52,3 +52,24 @@ bool kvm_vcpu_init_changed(struct kvm_vcpu *vcpu, return !bitmap_equal(vcpu->kvm->arch.vcpu_features, &features, KVM_VCPU_MAX_FEATURES); } + +int kvm_vm_type_ipa_size_shift(unsigned long type) +{ + int phys_shift; + + phys_shift = KVM_VM_TYPE_ARM_IPA_SIZE(type); + if (phys_shift) { + if (phys_shift > get_kvm_ipa_limit() || + phys_shift < ARM64_MIN_PARANGE_BITS) + return -EINVAL; + } else { + phys_shift = KVM_PHYS_SHIFT; + if (phys_shift > get_kvm_ipa_limit()) { + pr_warn_once("%s using unsupported default IPA limit, upgrade your VMM\n", + current->comm); + return -EINVAL; + } + } + + return phys_shift; +} -- 2.51.0