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Mon, 22 Dec 2025 16:50:55 +0000 (GMT) From: Claudio Imbrenda To: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, borntraeger@de.ibm.com, frankja@linux.ibm.com, nsg@linux.ibm.com, nrb@linux.ibm.com, seiden@linux.ibm.com, gra@linux.ibm.com, schlameuss@linux.ibm.com, hca@linux.ibm.com, svens@linux.ibm.com, agordeev@linux.ibm.com, gor@linux.ibm.com, david@redhat.com, gerald.schaefer@linux.ibm.com Subject: [PATCH v6 16/28] KVM: s390: KVM page table management functions: storage keys Date: Mon, 22 Dec 2025 17:50:21 +0100 Message-ID: <20251222165033.162329-17-imbrenda@linux.ibm.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251222165033.162329-1-imbrenda@linux.ibm.com> References: <20251222165033.162329-1-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-Spam-Details-Enc: AW1haW4tMjUxMjIyMDE1NCBTYWx0ZWRfX5tNUWdS/exYC WhNuvNz9FidyrQkIfcgJg8OLUkhCovcDCeHdg9+yjIkxZKtB9BIuWjerXf7ZUJ2z/d1Yluztf6l iSSeAgCTBD89tU1E/tO/mRPFHdPqaAR0TtmJHsajCfkmi9y8V/uRVIU29IDMUFoFvUKCNxyIYWo whWP2tLL91K1QsfAn+tag1Zw5XbfC6qyNvXHOB04q8XFaeO6Je4qf9u9bR+KcgpNzStkjQhoJX7 iKaO5t0XlfPkgGqR4rfU6R0nIPrD1kIPzpE9mbRA26Bty9OuoRh/2DyHBRTcfSZ/oMiZLyXxTXq iiZlvV+JLPGGMLbBoGKpg3NwTygf2qQ06XytomT/QCXmIXIMQgPTZkKUWs+JfYtvJwggZQuKlSK KMg3gNllLSKmgAkyzREwu+nLyRTFfx9CfwcpXv1IYaGh2BwTI45ZYWloIM/ZayVaFKXWAF2PHGr IWcztaLbVD0IsFYwY5A== X-Authority-Analysis: v=2.4 cv=Ba3VE7t2 c=1 sm=1 tr=0 ts=694976f5 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=wP3pNCr1ah4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8 a=W9Pr6BDoNAxxbfFvkF8A:9 X-Proofpoint-ORIG-GUID: FQBO9Xj6ir5p2Rj1hEpICd0VzBN2fid_ X-Proofpoint-GUID: FQBO9Xj6ir5p2Rj1hEpICd0VzBN2fid_ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-12-22_02,2025-12-22_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 bulkscore=0 adultscore=0 priorityscore=1501 malwarescore=0 lowpriorityscore=0 impostorscore=0 clxscore=1015 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2512120000 definitions=main-2512220154 Content-Type: text/plain; charset="utf-8" Add page table management functions to be used for KVM guest (gmap) page tables. This patch adds functions related to storage key handling. Signed-off-by: Claudio Imbrenda --- arch/s390/kvm/dat.c | 215 ++++++++++++++++++++++++++++++++++++++++++++ arch/s390/kvm/dat.h | 7 ++ 2 files changed, 222 insertions(+) diff --git a/arch/s390/kvm/dat.c b/arch/s390/kvm/dat.c index 3158652dbe8e..d75329cf1f47 100644 --- a/arch/s390/kvm/dat.c +++ b/arch/s390/kvm/dat.c @@ -605,3 +605,218 @@ long _dat_walk_gfn_range(gfn_t start, gfn_t end, unio= n asce asce, =20 return dat_crste_walk_range(start, min(end, asce_end(asce)), table, &walk= ); } + +int dat_get_storage_key(union asce asce, gfn_t gfn, union skey *skey) +{ + union crste *crstep; + union pgste pgste; + union pte *ptep; + int rc; + + skey->skey =3D 0; + rc =3D dat_entry_walk(NULL, gfn, asce, DAT_WALK_ANY, TABLE_TYPE_PAGE_TABL= E, &crstep, &ptep); + if (rc) + return rc; + + if (!ptep) { + union crste crste; + + crste =3D READ_ONCE(*crstep); + if (!crste.h.fc || !crste.s.fc1.pr) + return 0; + skey->skey =3D page_get_storage_key(large_crste_to_phys(crste, gfn)); + return 0; + } + pgste =3D pgste_get_lock(ptep); + if (ptep->h.i) { + skey->acc =3D pgste.acc; + skey->fp =3D pgste.fp; + } else { + skey->skey =3D page_get_storage_key(pte_origin(*ptep)); + } + skey->r |=3D pgste.gr; + skey->c |=3D pgste.gc; + pgste_set_unlock(ptep, pgste); + return 0; +} + +static void dat_update_ptep_sd(union pgste old, union pgste pgste, union p= te *ptep) +{ + if (pgste.acc !=3D old.acc || pgste.fp !=3D old.fp || pgste.gr !=3D old.g= r || pgste.gc !=3D old.gc) + __atomic64_or(_PAGE_SD, &ptep->val); +} + +int dat_set_storage_key(struct kvm_s390_mmu_cache *mc, union asce asce, gf= n_t gfn, + union skey skey, bool nq) +{ + union pgste pgste, old; + union crste *crstep; + union pte *ptep; + int rc; + + rc =3D dat_entry_walk(mc, gfn, asce, DAT_WALK_LEAF_ALLOC, TABLE_TYPE_PAGE= _TABLE, + &crstep, &ptep); + if (rc) + return rc; + + if (!ptep) { + page_set_storage_key(large_crste_to_phys(*crstep, gfn), skey.skey, !nq); + return 0; + } + + old =3D pgste_get_lock(ptep); + pgste =3D old; + + pgste.acc =3D skey.acc; + pgste.fp =3D skey.fp; + pgste.gc =3D skey.c; + pgste.gr =3D skey.r; + + if (!ptep->h.i) { + union skey old_skey; + + old_skey.skey =3D page_get_storage_key(pte_origin(*ptep)); + pgste.hc |=3D old_skey.c; + pgste.hr |=3D old_skey.r; + skey.r =3D 0; + skey.c =3D 0; + page_set_storage_key(pte_origin(*ptep), skey.skey, !nq); + } + + dat_update_ptep_sd(old, pgste, ptep); + pgste_set_unlock(ptep, pgste); + return 0; +} + +static bool page_cond_set_storage_key(phys_addr_t paddr, union skey skey, = union skey *oldkey, + bool nq, bool mr, bool mc) +{ + oldkey->skey =3D page_get_storage_key(paddr); + if (oldkey->acc =3D=3D skey.acc && oldkey->fp =3D=3D skey.fp && + (oldkey->r =3D=3D skey.r || mr) && (oldkey->c =3D=3D skey.c || mc)) + return false; + page_set_storage_key(paddr, skey.skey, !nq); + return true; +} + +int dat_cond_set_storage_key(struct kvm_s390_mmu_cache *mmc, union asce as= ce, gfn_t gfn, + union skey skey, union skey *oldkey, bool nq, bool mr, bool mc) +{ + union pgste pgste, old; + union crste *crstep; + union pte *ptep; + int rc; + + rc =3D dat_entry_walk(mmc, gfn, asce, DAT_WALK_LEAF_ALLOC, TABLE_TYPE_PAG= E_TABLE, + &crstep, &ptep); + if (rc) + return rc; + + if (!ptep) + return page_cond_set_storage_key(large_crste_to_phys(*crstep, gfn), skey= , oldkey, + nq, mr, mc); + + old =3D pgste_get_lock(ptep); + pgste =3D old; + + rc =3D 1; + pgste.acc =3D skey.acc; + pgste.fp =3D skey.fp; + pgste.gc =3D skey.c; + pgste.gr =3D skey.r; + + if (!ptep->h.i) { + union skey prev; + + rc =3D page_cond_set_storage_key(pte_origin(*ptep), skey, &prev, nq, mr,= mc); + pgste.hc |=3D prev.c; + pgste.hr |=3D prev.r; + if (oldkey) + *oldkey =3D prev; + } + + dat_update_ptep_sd(old, pgste, ptep); + pgste_set_unlock(ptep, pgste); + return rc; +} + +int dat_reset_reference_bit(union asce asce, gfn_t gfn) +{ + union pgste pgste, old; + union crste *crstep; + union pte *ptep; + int rc; + + rc =3D dat_entry_walk(NULL, gfn, asce, DAT_WALK_ANY, TABLE_TYPE_PAGE_TABL= E, &crstep, &ptep); + if (rc) + return rc; + + if (!ptep) { + union crste crste =3D READ_ONCE(*crstep); + + if (!crste.h.fc || !crste.s.fc1.pr) + return 0; + return page_reset_referenced(large_crste_to_phys(*crstep, gfn)); + } + old =3D pgste_get_lock(ptep); + pgste =3D old; + + if (!ptep->h.i) { + rc =3D page_reset_referenced(pte_origin(*ptep)); + pgste.hr =3D rc >> 1; + } + rc |=3D (pgste.gr << 1) | pgste.gc; + pgste.gr =3D 0; + + dat_update_ptep_sd(old, pgste, ptep); + pgste_set_unlock(ptep, pgste); + return rc; +} + +static long dat_reset_skeys_pte(union pte *ptep, gfn_t gfn, gfn_t next, st= ruct dat_walk *walk) +{ + union pgste pgste; + + pgste =3D pgste_get_lock(ptep); + pgste.acc =3D 0; + pgste.fp =3D 0; + pgste.gr =3D 0; + pgste.gc =3D 0; + if (ptep->s.pr) + page_set_storage_key(pte_origin(*ptep), PAGE_DEFAULT_KEY, 1); + pgste_set_unlock(ptep, pgste); + + if (need_resched()) + return next; + return 0; +} + +static long dat_reset_skeys_crste(union crste *crstep, gfn_t gfn, gfn_t ne= xt, struct dat_walk *walk) +{ + phys_addr_t addr, end, origin =3D crste_origin_large(*crstep); + + if (!crstep->h.fc || !crstep->s.fc1.pr) + return 0; + + addr =3D ((max(gfn, walk->start) - gfn) << PAGE_SHIFT) + origin; + end =3D ((min(next, walk->end) - gfn) << PAGE_SHIFT) + origin; + while (ALIGN(addr + 1, _SEGMENT_SIZE) <=3D end) + addr =3D sske_frame(addr, PAGE_DEFAULT_KEY); + for ( ; addr < end; addr +=3D PAGE_SIZE) + page_set_storage_key(addr, PAGE_DEFAULT_KEY, 1); + + if (need_resched()) + return next; + return 0; +} + +long dat_reset_skeys(union asce asce, gfn_t start) +{ + const struct dat_walk_ops ops =3D { + .pte_entry =3D dat_reset_skeys_pte, + .pmd_entry =3D dat_reset_skeys_crste, + .pud_entry =3D dat_reset_skeys_crste, + }; + + return _dat_walk_gfn_range(start, asce_end(asce), asce, &ops, DAT_WALK_IG= N_HOLES, NULL); +} diff --git a/arch/s390/kvm/dat.h b/arch/s390/kvm/dat.h index 902d4a044067..4cd573fcbdd6 100644 --- a/arch/s390/kvm/dat.h +++ b/arch/s390/kvm/dat.h @@ -472,6 +472,13 @@ int dat_entry_walk(struct kvm_s390_mmu_cache *mc, gfn_= t gfn, union asce asce, in int walk_level, union crste **last, union pte **ptepp); void dat_free_level(struct crst_table *table, bool owns_ptes); struct crst_table *dat_alloc_crst_sleepable(unsigned long init); +int dat_get_storage_key(union asce asce, gfn_t gfn, union skey *skey); +int dat_set_storage_key(struct kvm_s390_mmu_cache *mc, union asce asce, gf= n_t gfn, + union skey skey, bool nq); +int dat_cond_set_storage_key(struct kvm_s390_mmu_cache *mmc, union asce as= ce, gfn_t gfn, + union skey skey, union skey *oldkey, bool nq, bool mr, bool mc); +int dat_reset_reference_bit(union asce asce, gfn_t gfn); +long dat_reset_skeys(union asce asce, gfn_t start); =20 int kvm_s390_mmu_cache_topup(struct kvm_s390_mmu_cache *mc); =20 --=20 2.52.0