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Fri, 31 Jul 2026 13:09:11 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.87.85.9]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 31 Jul 2026 13:09:11 +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: 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 , Paolo Bonzini , Suzuki K Poulose , Sven Schnelle , Ulrich Weigand , Vasily Gorbik , Will Deacon , Zenghui Yu Subject: [PATCH v5 19/31] KVM: s390: gmap: Move prefix handling to kvm/s390 Date: Fri, 31 Jul 2026 15:08:47 +0200 Message-ID: <20260731130902.654679-20-seiden@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260731130902.654679-1-seiden@linux.ibm.com> References: <20260731130902.654679-1-seiden@linux.ibm.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-GUID: jmbg_IUaJhgEWwTs7p6F0H2czEl_h1lr X-Proofpoint-ORIG-GUID: Wcl7-u5EVBgteko2dK6MwurjdXbtNLex X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzMxMDA5NiBTYWx0ZWRfX0Nd9DjaUMJq1 Zf6vtoNhpzjGnuAvELovmjR4zJz4sSvVIyfBNGDJcQbB4u6b2Vhzn5Ojz+nRH0ZTptioQiVIIz1 8WZy9lIzqwkc0atwgMM4GtXveRa+5JCpOEMhmPNmGvIL86xBugfrVVV1RvW1qJJH0uUBm2E/B45 AVEA+N9fYvrnL89u/sbGauQuvjHHR/1XbMMuaV4m1/z6hjfaAZ1U99UzTK5LqDPz/sBFRZvonJf Q8XmpkOYu2Oq4m8qz83mBSUfHxRXAoUV7S/AWHMc0CAl7cUS9hv4FVYDiVwVyWrQkEmgGy0nrIF 85qgiFDZYW4MsAxFOQUcNwVya7ilNJvedi7PmR/0QVBzCjrmCl+/VRliEQhtAKpLRHcS+90UPNx JkZ9pAlfRNM+9jZZLND2nqG8maKSW+tkSMO8kbZiTEQ1YU/6RgbjsbQoWmxjh5/ePy+8nJcnQOU g6rVTbDxveAeMkBrmiw== X-Authority-Analysis: v=2.4 cv=SKFykuvH c=1 sm=1 tr=0 ts=6a6c9e7f cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=4SwaMfgYKtkue4rGTFgA:9 X-Proofpoint-Spam-Info: AW1haW4tMjYwNzMxMDA5NiBTYWx0ZWRfX2SqBLmgj3JDN 4jwCnM55PiHBDB99DYBZCcdRcScyts97tkVyAA3exp7ysiuel1YbaD5lTj7/ziEVIV7QbmxIz/z 9SnDYvPgTzmtq8XL1AlZRUz0i/tko8k= 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=2026-07-31_04,2026-07-30_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 clxscore=1015 adultscore=0 lowpriorityscore=0 bulkscore=0 impostorscore=0 phishscore=0 spamscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607310096 Move code handling prefix page tracking from kvm/gmap to kvm/s390. This enables other KVM implementations to use gmap without implementing prefix handling. The prefix tracking is turned on if KVM_S390_GUEST_HAS_PREFIX is defined. No functional changes. Signed-off-by: Steffen Eiden --- arch/s390/include/asm/kvm_host_s390.h | 2 ++ arch/s390/kvm/gmap/dat.c | 48 --------------------------- arch/s390/kvm/gmap/dat.h | 1 - arch/s390/kvm/gmap/gmap.c | 28 ---------------- arch/s390/kvm/gmap/gmap.h | 12 +------ arch/s390/kvm/gmap/prefix.h | 39 ++++++++++++++++++++++ arch/s390/kvm/s390/dat.c | 48 +++++++++++++++++++++++++++ arch/s390/kvm/s390/gmap.c | 29 ++++++++++++++++ 8 files changed, 119 insertions(+), 88 deletions(-) create mode 100644 arch/s390/kvm/gmap/prefix.h diff --git a/arch/s390/include/asm/kvm_host_s390.h b/arch/s390/include/asm/kvm_host_s390.h index 9e4d7ed53078..cfd95df60130 100644 --- a/arch/s390/include/asm/kvm_host_s390.h +++ b/arch/s390/include/asm/kvm_host_s390.h @@ -32,6 +32,8 @@ #define KVM_INTERNAL_MEM_SLOTS 1 +#define KVM_S390_GUEST_HAS_PREFIX + /* * These seem to be used for allocating ->chip in the routing table, which we * don't use. 1 is as small as we can get to reduce the needed memory. If we diff --git a/arch/s390/kvm/gmap/dat.c b/arch/s390/kvm/gmap/dat.c index 1ac6457de498..6252a7cd81a8 100644 --- a/arch/s390/kvm/gmap/dat.c +++ b/arch/s390/kvm/gmap/dat.c @@ -777,51 +777,3 @@ bool dat_test_age_gfn(union asce asce, gfn_t start, gfn_t end) return _dat_walk_gfn_range(start, end, asce, &test_age_ops, 0, NULL) > 0; } -static long dat_set_pn_crste(union crste *crstep, gfn_t gfn, gfn_t next, struct dat_walk *walk) -{ - union crste newcrste, oldcrste; - int *n = walk->priv; - - do { - oldcrste = READ_ONCE(*crstep); - if (!oldcrste.h.fc || oldcrste.h.i || oldcrste.h.p) - return 0; - if (oldcrste.s.fc1.prefix_notif) - break; - newcrste = oldcrste; - newcrste.s.fc1.prefix_notif = 1; - } while (!dat_crstep_xchg_atomic(crstep, oldcrste, newcrste, gfn, walk->asce)); - *n = 2; - return 0; -} - -static long dat_set_pn_pte(union pte *ptep, gfn_t gfn, gfn_t next, struct dat_walk *walk) -{ - int *n = walk->priv; - union pgste pgste; - - pgste = pgste_get_lock(ptep); - if (!ptep->h.i && !ptep->h.p) { - pgste.prefix_notif = 1; - *n += 1; - } - pgste_set_unlock(ptep, pgste); - return 0; -} - -int dat_set_prefix_notif_bit(union asce asce, gfn_t gfn) -{ - static const struct dat_walk_ops ops = { - .pte_entry = dat_set_pn_pte, - .pmd_entry = dat_set_pn_crste, - .pud_entry = dat_set_pn_crste, - }; - - int n = 0; - - _dat_walk_gfn_range(gfn, gfn + 2, asce, &ops, DAT_WALK_IGN_HOLES, &n); - if (n != 2) - return -EAGAIN; - return 0; -} - diff --git a/arch/s390/kvm/gmap/dat.h b/arch/s390/kvm/gmap/dat.h index e6fd201ec9b9..fb412bd07685 100644 --- a/arch/s390/kvm/gmap/dat.h +++ b/arch/s390/kvm/gmap/dat.h @@ -538,7 +538,6 @@ void dat_set_ptval(struct page_table *table, struct ptval_param param, unsigned int dat_set_slot(struct kvm_s390_mmu_cache *mc, union asce asce, gfn_t start, gfn_t end, u16 type, u16 param); -int dat_set_prefix_notif_bit(union asce asce, gfn_t gfn); bool dat_test_age_gfn(union asce asce, gfn_t start, gfn_t end); int dat_perform_essa(union asce asce, gfn_t gfn, int orc, union essa_state *state, bool *dirty); diff --git a/arch/s390/kvm/gmap/gmap.c b/arch/s390/kvm/gmap/gmap.c index c4ed40ea3475..07915278ee98 100644 --- a/arch/s390/kvm/gmap/gmap.c +++ b/arch/s390/kvm/gmap/gmap.c @@ -24,11 +24,6 @@ #include "s390.h" #include "faultin.h" -static inline bool kvm_s390_is_in_sie(struct kvm_vcpu *vcpu) -{ - return vcpu->arch.sie_block->prog0c & PROG_IN_SIE; -} - static int gmap_limit_to_type(gfn_t limit) { if (!limit) @@ -256,29 +251,6 @@ int s390_replace_asce(struct gmap *gmap) return 0; } -bool _gmap_unmap_prefix(struct gmap *gmap, gfn_t gfn, gfn_t end, bool hint) -{ - struct kvm *kvm = gmap->kvm; - struct kvm_vcpu *vcpu; - gfn_t prefix_gfn; - unsigned long i; - - if (is_shadow(gmap)) - return false; - kvm_for_each_vcpu(i, vcpu, kvm) { - /* Match against both prefix pages */ - prefix_gfn = gpa_to_gfn(kvm_s390_get_prefix(vcpu)); - if (prefix_gfn < end && gfn <= prefix_gfn + 1) { - if (hint && kvm_s390_is_in_sie(vcpu)) - return false; - VCPU_EVENT(vcpu, 2, "gmap notifier for %llx-%llx", - gfn_to_gpa(gfn), gfn_to_gpa(end)); - kvm_s390_sync_request(KVM_REQ_REFRESH_GUEST_PREFIX, vcpu); - } - } - return true; -} - struct clear_young_pte_priv { struct gmap *gmap; bool young; diff --git a/arch/s390/kvm/gmap/gmap.h b/arch/s390/kvm/gmap/gmap.h index c9cab8f60f62..28ab585db7e1 100644 --- a/arch/s390/kvm/gmap/gmap.h +++ b/arch/s390/kvm/gmap/gmap.h @@ -11,6 +11,7 @@ #define ARCH_KVM_GMAP_GMAP_H #include "dat.h" +#include "prefix.h" /** * enum gmap_flags - Flags of a gmap. @@ -83,7 +84,6 @@ struct gmap_cache { for (pos = (head); n = pos ? pos->next : NULL, pos; pos = n) int s390_replace_asce(struct gmap *gmap); -bool _gmap_unmap_prefix(struct gmap *gmap, gfn_t gfn, gfn_t end, bool hint); bool gmap_age_gfn(struct gmap *gmap, gfn_t start, gfn_t end); bool gmap_unmap_gfn_range(struct gmap *gmap, struct kvm_memory_slot *slot, gfn_t start, gfn_t end); int gmap_try_fixup_minor(struct gmap *gmap, struct guest_fault *fault); @@ -157,16 +157,6 @@ static inline void gmap_handle_vsie_unshadow_event(struct gmap *parent, gfn_t gf _gmap_handle_vsie_unshadow_event(parent, gfn); } -static inline bool gmap_mkold_prefix(struct gmap *gmap, gfn_t gfn, gfn_t end) -{ - return _gmap_unmap_prefix(gmap, gfn, end, true); -} - -static inline bool gmap_unmap_prefix(struct gmap *gmap, gfn_t gfn, gfn_t end) -{ - return _gmap_unmap_prefix(gmap, gfn, end, false); -} - /** * pte_needs_unshadow() -- Check if the pte operations triggers unshadowing. * @oldpte: the previous value for the guest pte. diff --git a/arch/s390/kvm/gmap/prefix.h b/arch/s390/kvm/gmap/prefix.h new file mode 100644 index 000000000000..f83b6c2c4afa --- /dev/null +++ b/arch/s390/kvm/gmap/prefix.h @@ -0,0 +1,39 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef ARCH_KVM_GMAP_PREFIX_H +#define ARCH_KVM_GMAP_PREFIX_H + +#include "asm/dat-bits.h" +#include +#include +#include + +struct gmap; +union asce; + +#ifdef KVM_S390_GUEST_HAS_PREFIX +bool _gmap_unmap_prefix(struct gmap *gmap, gfn_t gfn, gfn_t end, bool hint); +int dat_set_prefix_notif_bit(union asce asce, gfn_t gfn); +#else +static inline bool _gmap_unmap_prefix(struct gmap *gmap, gfn_t gfn, gfn_t end, bool hint) +{ + return true; +} + +static inline int dat_set_prefix_notif_bit(union asce asce, gfn_t gfn) +{ + return 0; +} +#endif /* KVM_S390_GUEST_HAS_PREFIX */ + +static inline bool gmap_mkold_prefix(struct gmap *gmap, gfn_t gfn, gfn_t end) +{ + return _gmap_unmap_prefix(gmap, gfn, end, true); +} + +static inline bool gmap_unmap_prefix(struct gmap *gmap, gfn_t gfn, gfn_t end) +{ + return _gmap_unmap_prefix(gmap, gfn, end, false); +} + +#endif /* ARCH_KVM_GMAP_PREFIX_H */ diff --git a/arch/s390/kvm/s390/dat.c b/arch/s390/kvm/s390/dat.c index ff2d6c1cf90e..a56b1523e6e4 100644 --- a/arch/s390/kvm/s390/dat.c +++ b/arch/s390/kvm/s390/dat.c @@ -504,3 +504,51 @@ int dat_set_cmma_bits(struct kvm_s390_mmu_cache *mc, union asce asce, gfn_t gfn, } return _dat_walk_gfn_range(gfn, gfn + count, asce, &ops, DAT_WALK_IGN_HOLES, &state); } + +static long dat_set_pn_crste(union crste *crstep, gfn_t gfn, gfn_t next, struct dat_walk *walk) +{ + union crste newcrste, oldcrste; + int *n = walk->priv; + + do { + oldcrste = READ_ONCE(*crstep); + if (!oldcrste.h.fc || oldcrste.h.i || oldcrste.h.p) + return 0; + if (oldcrste.s.fc1.prefix_notif) + break; + newcrste = oldcrste; + newcrste.s.fc1.prefix_notif = 1; + } while (!dat_crstep_xchg_atomic(crstep, oldcrste, newcrste, gfn, walk->asce)); + *n = 2; + return 0; +} + +static long dat_set_pn_pte(union pte *ptep, gfn_t gfn, gfn_t next, struct dat_walk *walk) +{ + int *n = walk->priv; + union pgste pgste; + + pgste = pgste_get_lock(ptep); + if (!ptep->h.i && !ptep->h.p) { + pgste.prefix_notif = 1; + *n += 1; + } + pgste_set_unlock(ptep, pgste); + return 0; +} + +int dat_set_prefix_notif_bit(union asce asce, gfn_t gfn) +{ + static const struct dat_walk_ops ops = { + .pte_entry = dat_set_pn_pte, + .pmd_entry = dat_set_pn_crste, + .pud_entry = dat_set_pn_crste, + }; + + int n = 0; + + _dat_walk_gfn_range(gfn, gfn + 2, asce, &ops, DAT_WALK_IGN_HOLES, &n); + if (n != 2) + return -EAGAIN; + return 0; +} diff --git a/arch/s390/kvm/s390/gmap.c b/arch/s390/kvm/s390/gmap.c index 83def0ed2284..b744992f0af1 100644 --- a/arch/s390/kvm/s390/gmap.c +++ b/arch/s390/kvm/s390/gmap.c @@ -3,6 +3,7 @@ #include #include #include +#include #include "s390.h" static int _gmap_enable_skeys(struct gmap *gmap) @@ -82,3 +83,31 @@ void _gmap_set_cmma_all(struct gmap *gmap, bool dirty) } while (gfn); } +static inline bool kvm_s390_is_in_sie(struct kvm_vcpu *vcpu) +{ + return vcpu->arch.sie_block->prog0c & PROG_IN_SIE; +} + +bool _gmap_unmap_prefix(struct gmap *gmap, gfn_t gfn, gfn_t end, bool hint) +{ + struct kvm *kvm = gmap->kvm; + struct kvm_vcpu *vcpu; + gfn_t prefix_gfn; + unsigned long i; + + if (is_shadow(gmap)) + return false; + kvm_for_each_vcpu(i, vcpu, kvm) { + /* Match against both prefix pages */ + prefix_gfn = gpa_to_gfn(kvm_s390_get_prefix(vcpu)); + if (prefix_gfn < end && gfn <= prefix_gfn + 1) { + if (hint && kvm_s390_is_in_sie(vcpu)) + return false; + VCPU_EVENT(vcpu, 2, "gmap notifier for %llx-%llx", + gfn_to_gpa(gfn), gfn_to_gpa(end)); + kvm_s390_sync_request(KVM_REQ_REFRESH_GUEST_PREFIX, vcpu); + } + } + return true; +} + -- 2.53.0