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Thu, 21 May 2026 13:05:34 +0000 (GMT) Received: from p-imbrenda.aag-de.ibm.com (unknown [9.52.223.175]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 21 May 2026 13:05:34 +0000 (GMT) From: Claudio Imbrenda To: linux-kernel@vger.kernel.org Cc: kvm@vger.kernel.org, linux-s390@vger.kernel.org, borntraeger@de.ibm.com, frankja@linux.ibm.com, david@kernel.org, seiden@linux.ibm.com, nrb@linux.ibm.com, schlameuss@linux.ibm.com, gra@linux.ibm.com, pbonzini@redhat.com, seanjc@google.com, yan.y.zhao@intel.com, isaku.yamahata@intel.com Subject: [PATCH v2 1/5] KVM: s390: Track page size in struct guest_fault Date: Thu, 21 May 2026 15:05:29 +0200 Message-ID: <20260521130533.156491-2-imbrenda@linux.ibm.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260521130533.156491-1-imbrenda@linux.ibm.com> References: <20260521130533.156491-1-imbrenda@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: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Authority-Analysis: v=2.4 cv=ffCdDUQF c=1 sm=1 tr=0 ts=6a0f0325 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VnNF1IyMAAAA:8 a=HydwJh4hHmF5zmZ3e14A:9 X-Proofpoint-ORIG-GUID: DZbXDkbKjzRpQ523im5tC0gtKz2IWN3X X-Proofpoint-GUID: _ZircIAaRkx5g0A3L7Za8Z5zgqe8p6ol X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTIxMDEyNiBTYWx0ZWRfX8UGLrXnVvLcv GrhvzhanDZVg4882rN2YpBzGHCx0K2OSFGoSTfzO/wGSlQYqJvBkzink4ksOaFs1TIfqY1WxweE zDY9xKVqu+gXjtuhvxuXcUZHotfFpzrGMf42hgpFJX13StCzmOByyQdbRR5CNDDx3A8omSYok+H CCTyjOgaz9L8PAZY1T1FRut1QbUL6NdkBjkjktkj2TmhyYie8MxTmq9oCFOtSFr/GnWo8nDELOh IMOutZe/hLTwQbKOTKMn0gfLsuH3fLxsa7FNazEbj/qvge4wmb3P2oJhalYUbKPnMAoqOFuauRg 4rLL2jUVnn6Zt3CD47g215hbD/t+vqDAEBfqKgWE43g7AOePsBtRY1KhZSCImtWK7bpWahmPaBF zs1quP+fuPzY+1D9bNLtQeOqa/qGKwnnxFXlvE2Fcu3XxEA/M95L+gkGEhBYJ1CHtqe1EkMkhZ3 pFJYtqVL6kQHUgIwJBg== 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=2026-05-21_02,2026-05-18_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 spamscore=0 phishscore=0 suspectscore=0 adultscore=0 clxscore=1015 impostorscore=0 lowpriorityscore=0 bulkscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605130000 definitions=main-2605210126 Content-Type: text/plain; charset="utf-8" Until now, the members of struct guest_fault are always accessed while holding the required locks, and thus the ptep and crstep pointers can be dereferenced safely. There will be some new cases where callers of kvm_s390_faultin_gfn() need to know the size of the page used to solve the fault, at which point no locks are held anymore, and dereferencing the crstep field is not possible. Introduce a new crste_region3 flag for struct guest_fault to indicate whether the crstep used to solve the fault was a region 3 entry with FC=3D1 (large pud). This allows to disambiguate all three possible scenarios: * If ptep is not NULL, the fault was solved with a pte. * If ptep is NULL and crste_region3 is 0, a segment entry with FC=3D1 (large pmd) was used. * If ptep is NULL and crste_region3 is 1, a region 3 entry with FC=3D1 (large pud) was used. Signed-off-by: Claudio Imbrenda --- arch/s390/kvm/dat.h | 1 + arch/s390/kvm/gmap.c | 2 ++ 2 files changed, 3 insertions(+) diff --git a/arch/s390/kvm/dat.h b/arch/s390/kvm/dat.h index 8f8278c44879..db09b8fc34d6 100644 --- a/arch/s390/kvm/dat.h +++ b/arch/s390/kvm/dat.h @@ -500,6 +500,7 @@ struct guest_fault { bool write_attempt; /* Write access attempted */ bool attempt_pfault; /* Attempt a pfault first */ bool valid; /* This entry contains valid data */ + bool crste_region3; /* Whether crstep referst to a region3 entry */ void (*callback)(struct guest_fault *f); void *priv; }; diff --git a/arch/s390/kvm/gmap.c b/arch/s390/kvm/gmap.c index 3c26e35af0ef..6f4143092871 100644 --- a/arch/s390/kvm/gmap.c +++ b/arch/s390/kvm/gmap.c @@ -545,6 +545,7 @@ static int gmap_handle_minor_crste_fault(struct gmap *g= map, struct guest_fault * newcrste.s.fc1.d =3D 1; newcrste.s.fc1.sd =3D 1; } + f->crste_region3 =3D is_pud(newcrste); /* In case of races, let the slow path deal with it. */ return !gmap_crstep_xchg_atomic(gmap, f->crstep, oldcrste, newcrste, f->= gfn); } @@ -690,6 +691,7 @@ static int _gmap_link(struct kvm_s390_mmu_cache *mc, st= ruct gmap *gmap, int leve if (oldval.val !=3D _CRSTE_EMPTY(oldval.h.tt).val && crste_origin_large(oldval) !=3D crste_origin_large(newval)) return -EAGAIN; + f->crste_region3 =3D is_pud(newval); } while (!gmap_crstep_xchg_atomic(gmap, f->crstep, oldval, newval, f->gf= n)); if (f->callback) f->callback(f); --=20 2.54.0 From nobody Sun May 24 20:34:45 2026 Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C934C3CBE75; Thu, 21 May 2026 13:05:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.158.5 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779368748; cv=none; b=AQJkGrVC2fGvU00rQ8So/VWUWYfv5H71h7nB3foA7sil5VlgbMw9KabftQpDJdbyJykVOwuIK1933EIJmpWLQD96XHY8nvhIgJyI6fnHSrt2bhiPtpCa7rnxgzHtfSFlTO40nu2BExv1l3kfhZEMr/dlVNz4xqCLHOaBNzAouXI= ARC-Message-Signature: i=1; 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charset="utf-8" Implement and enable the KVM_PRE_FAULT_MEMORY ioctl for s390. Faulted-in pages will be marked as accessed, unlike x86, otherwise they will trigger a minor fault when accessed. Avoiding such faults is one of the points of KVM_PRE_FAULT_MEMORY. Signed-off-by: Claudio Imbrenda --- arch/s390/kvm/Kconfig | 1 + arch/s390/kvm/kvm-s390.c | 45 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 46 insertions(+) diff --git a/arch/s390/kvm/Kconfig b/arch/s390/kvm/Kconfig index 5b835bc6a194..8d3ee17a1bcb 100644 --- a/arch/s390/kvm/Kconfig +++ b/arch/s390/kvm/Kconfig @@ -30,6 +30,7 @@ config KVM select KVM_VFIO select VIRT_XFER_TO_GUEST_WORK select KVM_MMU_LOCKLESS_AGING + select KVM_GENERIC_PRE_FAULT_MEMORY help Support hosting paravirtualized guest machines using the SIE virtualization capability on the mainframe. This should work diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index e09960c2e6ed..f6521f16532a 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -630,6 +630,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long = ext) case KVM_CAP_S390_USER_OPEREXEC: case KVM_CAP_S390_KEYOP: case KVM_CAP_S390_VSIE_ESAMODE: + case KVM_CAP_PRE_FAULT_MEMORY: r =3D 1; break; case KVM_CAP_SET_GUEST_DEBUG2: @@ -5736,6 +5737,50 @@ void kvm_arch_commit_memory_region(struct kvm *kvm, return; } =20 +/** + * kvm_arch_vcpu_pre_fault_memory() -- pre-fault and link gmap dat tables + * @vcpu: the vcpu that shall appear to have generated the fault-in. + * @range: the range that needs to be faulted in. + * + * The first page of the given range is faulted in and the corresponding g= map + * page tables are created, as if the given vCPU had performed a read + * operation. + * If the range starts outside any memslots, an error is returned. 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charset="utf-8" Update the API documentation for KVM_PRE_FAULT_MEMORY to account for its s390 implementation. Signed-off-by: Claudio Imbrenda --- Documentation/virt/kvm/api.rst | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index 52bbbb553ce1..e7998feaa940 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -6471,7 +6471,8 @@ Errors: =20 =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D EINVAL The specified `gpa` and `size` were invalid (e.g. not - page aligned, causes an overflow, or size is zero). + page aligned, causes an overflow, or size is zero), or the VM + is UCONTROL (s390). ENOENT The specified `gpa` is outside defined memslots. EINTR An unmasked signal is pending and no page was processed. EFAULT The parameter address was invalid. @@ -6494,7 +6495,7 @@ Errors: KVM_PRE_FAULT_MEMORY populates KVM's stage-2 page tables used to map memory for the current vCPU state. KVM maps memory as if the vCPU generated a stage-2 read page fault, e.g. faults in memory as needed, but doesn't break -CoW. However, KVM does not mark any newly created stage-2 PTE as Accessed. +CoW. 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charset="utf-8" Add a missing #include which is needed and otherwise not included on s390. Remove the assertion vcpu->run->exit_reason =3D=3D KVM_EXIT_IO since it is x86-specific and redundant anyway. Signed-off-by: Claudio Imbrenda Acked-by: Sean Christopherson --- tools/testing/selftests/kvm/pre_fault_memory_test.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/tools/testing/selftests/kvm/pre_fault_memory_test.c b/tools/te= sting/selftests/kvm/pre_fault_memory_test.c index fcb57fd034e6..a0fcae3cb7a8 100644 --- a/tools/testing/selftests/kvm/pre_fault_memory_test.c +++ b/tools/testing/selftests/kvm/pre_fault_memory_test.c @@ -11,6 +11,7 @@ #include #include #include +#include =20 /* Arbitrarily chosen values */ #define TEST_SIZE (SZ_2M + PAGE_SIZE) @@ -167,7 +168,6 @@ static void __test_pre_fault_memory(unsigned long vm_ty= pe, bool private) .type =3D vm_type, }; struct kvm_vcpu *vcpu; - struct kvm_run *run; struct kvm_vm *vm; struct ucall uc; =20 @@ -193,11 +193,6 @@ static void __test_pre_fault_memory(unsigned long vm_t= ype, bool private) vcpu_args_set(vcpu, 1, gva); vcpu_run(vcpu); =20 - run =3D vcpu->run; - TEST_ASSERT(run->exit_reason =3D=3D KVM_EXIT_IO, - "Wanted KVM_EXIT_IO, got exit reason: %u (%s)", - run->exit_reason, exit_reason_str(run->exit_reason)); - switch (get_ucall(vcpu, &uc)) { case UCALL_ABORT: REPORT_GUEST_ASSERT(uc); --=20 2.54.0 From nobody Sun May 24 20:34:45 2026 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 481BF3D810D; Thu, 21 May 2026 13:05:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.156.1 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779368754; cv=none; b=FQcMK2uhcvNM6/Wj1T4JWbHPalC6W2VNiG/b+qvZkuAGoa3z1t0UXGB8Vk7/gjo7rPmCCrkjyG13gostEg1mjxLtTBwRq29vFKbcLH5dkkiicZTuD4RsaGf8WXQIyap9OsL56g6E8/BA92fDqP7m0DWMcfwD0DKFRs9bHISFAVw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779368754; c=relaxed/simple; bh=cU0xorK2ua1kep2b1OWcJuac0RINbn0aDFuJbUaNTYY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; 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charset="utf-8" Enable the pre_fault_memory_test to run on s390. Signed-off-by: Claudio Imbrenda --- tools/testing/selftests/kvm/Makefile.kvm | 1 + 1 file changed, 1 insertion(+) diff --git a/tools/testing/selftests/kvm/Makefile.kvm b/tools/testing/selft= ests/kvm/Makefile.kvm index 9118a5a51b89..fff939db89cd 100644 --- a/tools/testing/selftests/kvm/Makefile.kvm +++ b/tools/testing/selftests/kvm/Makefile.kvm @@ -210,6 +210,7 @@ TEST_GEN_PROGS_s390 +=3D s390/keyop TEST_GEN_PROGS_s390 +=3D rseq_test TEST_GEN_PROGS_s390 +=3D s390/irq_routing TEST_GEN_PROGS_s390 +=3D mmu_stress_test +TEST_GEN_PROGS_s390 +=3D pre_fault_memory_test =20 TEST_GEN_PROGS_riscv =3D $(TEST_GEN_PROGS_COMMON) TEST_GEN_PROGS_riscv +=3D riscv/sbi_pmu_test --=20 2.54.0