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Tue, 13 Dec 2022 16:54:12 +0000 (GMT) From: Janis Schoetterl-Glausch To: Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Heiko Carstens , Vasily Gorbik , Alexander Gordeev Cc: Janis Schoetterl-Glausch , David Hildenbrand , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-s390@vger.kernel.org, Paolo Bonzini , Shuah Khan , Sven Schnelle Subject: [PATCH v4 1/9] KVM: s390: Extend MEM_OP ioctl by storage key checked cmpxchg Date: Tue, 13 Dec 2022 17:53:57 +0100 Message-Id: <20221213165405.2953539-2-scgl@linux.ibm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221213165405.2953539-1-scgl@linux.ibm.com> References: <20221213165405.2953539-1-scgl@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: Of0-r-MRYeXMM0TW2y4XjRzpAyEBPSnF X-Proofpoint-GUID: nWo9t8yz8Y0JhRNKgj8JLj_Xs5O6iow_ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.923,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-12-13_03,2022-12-13_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 impostorscore=0 lowpriorityscore=0 malwarescore=0 adultscore=0 clxscore=1015 priorityscore=1501 phishscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2210170000 definitions=main-2212130147 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org User space can use the MEM_OP ioctl to make storage key checked reads and writes to the guest, however, it has no way of performing atomic, key checked, accesses to the guest. Extend the MEM_OP ioctl in order to allow for this, by adding a cmpxchg mode. For now, support this mode for absolute accesses only. This mode can be use, for example, to set the device-state-change indicator and the adapter-local-summary indicator atomically. Signed-off-by: Janis Schoetterl-Glausch --- include/uapi/linux/kvm.h | 7 +++ arch/s390/kvm/gaccess.h | 3 ++ arch/s390/kvm/gaccess.c | 102 +++++++++++++++++++++++++++++++++++++++ arch/s390/kvm/kvm-s390.c | 39 ++++++++++++++- 4 files changed, 149 insertions(+), 2 deletions(-) diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 0d5d4419139a..f106db1af5ee 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -588,6 +588,8 @@ struct kvm_s390_mem_op { struct { __u8 ar; /* the access register number */ __u8 key; /* access key, ignored if flag unset */ + __u8 pad1[6]; /* ignored */ + __u64 old_addr; /* ignored if flag unset */ }; __u32 sida_offset; /* offset into the sida */ __u8 reserved[32]; /* ignored */ @@ -604,6 +606,11 @@ struct kvm_s390_mem_op { #define KVM_S390_MEMOP_F_CHECK_ONLY (1ULL << 0) #define KVM_S390_MEMOP_F_INJECT_EXCEPTION (1ULL << 1) #define KVM_S390_MEMOP_F_SKEY_PROTECTION (1ULL << 2) +#define KVM_S390_MEMOP_F_CMPXCHG (1ULL << 3) +/* flags specifying extension support */ +#define KVM_S390_MEMOP_EXTENSION_CAP_CMPXCHG 0x2 +/* Non program exception return codes (pgm codes are 16 bit) */ +#define KVM_S390_MEMOP_R_NO_XCHG (1 << 16) /* for KVM_INTERRUPT */ struct kvm_interrupt { diff --git a/arch/s390/kvm/gaccess.h b/arch/s390/kvm/gaccess.h index 9408d6cc8e2c..92a3b9fb31ec 100644 --- a/arch/s390/kvm/gaccess.h +++ b/arch/s390/kvm/gaccess.h @@ -206,6 +206,9 @@ int access_guest_with_key(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar, int access_guest_real(struct kvm_vcpu *vcpu, unsigned long gra, void *data, unsigned long len, enum gacc_mode mode); +int cmpxchg_guest_abs_with_key(struct kvm *kvm, gpa_t gpa, int len, + __uint128_t *old, __uint128_t new, u8 access_key); + /** * write_guest_with_key - copy data from kernel space to guest space * @vcpu: virtual cpu diff --git a/arch/s390/kvm/gaccess.c b/arch/s390/kvm/gaccess.c index 0243b6e38d36..6165e761a637 100644 --- a/arch/s390/kvm/gaccess.c +++ b/arch/s390/kvm/gaccess.c @@ -1161,6 +1161,108 @@ int access_guest_real(struct kvm_vcpu *vcpu, unsigned long gra, return rc; } +/** + * cmpxchg_guest_abs_with_key() - Perform cmpxchg on guest absolute address. + * @kvm: Virtual machine instance. + * @gpa: Absolute guest address of the location to be changed. + * @len: Operand length of the cmpxchg, required: 1 <= len <= 16. Providing a + * non power of two will result in failure. + * @old_addr: Pointer to old value. If the location at @gpa contains this value, the + * exchange will succeed. After calling cmpxchg_guest_abs_with_key() *@old + * contains the value at @gpa before the attempt to exchange the value. + * @new: The value to place at @gpa. + * @access_key: The access key to use for the guest access. + * + * Atomically exchange the value at @gpa by @new, if it contains *@old. + * Honors storage keys. + * + * Return: * 0: successful exchange + * * 1: exchange unsuccessful + * * a program interruption code indicating the reason cmpxchg could + * not be attempted + * * -EINVAL: address misaligned or len not power of two + * * -EAGAIN: transient failure (len 1 or 2) + * * -EOPNOTSUPP: read-only memslot (should never occur) + */ +int cmpxchg_guest_abs_with_key(struct kvm *kvm, gpa_t gpa, int len, + __uint128_t *old_addr, __uint128_t new, + u8 access_key) +{ + gfn_t gfn = gpa >> PAGE_SHIFT; + struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); + bool writable; + hva_t hva; + int ret; + + if (!IS_ALIGNED(gpa, len)) + return -EINVAL; + + hva = gfn_to_hva_memslot_prot(slot, gfn, &writable); + if (kvm_is_error_hva(hva)) + return PGM_ADDRESSING; + /* + * Check if it's a read-only memslot, even though that cannot occur + * since those are unsupported. + * Don't try to actually handle that case. + */ + if (!writable) + return -EOPNOTSUPP; + + hva += offset_in_page(gpa); + switch (len) { + case 1: { + u8 old; + + ret = cmpxchg_user_key((u8 *)hva, &old, *old_addr, new, access_key); + ret = ret < 0 ? ret : old != *old_addr; + *old_addr = old; + break; + } + case 2: { + u16 old; + + ret = cmpxchg_user_key((u16 *)hva, &old, *old_addr, new, access_key); + ret = ret < 0 ? ret : old != *old_addr; + *old_addr = old; + break; + } + case 4: { + u32 old; + + ret = cmpxchg_user_key((u32 *)hva, &old, *old_addr, new, access_key); + ret = ret < 0 ? ret : old != *old_addr; + *old_addr = old; + break; + } + case 8: { + u64 old; + + ret = cmpxchg_user_key((u64 *)hva, &old, *old_addr, new, access_key); + ret = ret < 0 ? ret : old != *old_addr; + *old_addr = old; + break; + } + case 16: { + __uint128_t old; + + ret = cmpxchg_user_key((__uint128_t *)hva, &old, *old_addr, new, access_key); + ret = ret < 0 ? ret : old != *old_addr; + *old_addr = old; + break; + } + default: + return -EINVAL; + } + mark_page_dirty_in_slot(kvm, slot, gfn); + /* + * Assume that the fault is caused by protection, either key protection + * or user page write protection. + */ + if (ret == -EFAULT) + ret = PGM_PROTECTION; + return ret; +} + /** * guest_translate_address_with_key - translate guest logical into guest absolute address * @vcpu: virtual cpu diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 45d4b8182b07..47bcf2cb4345 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -576,7 +576,6 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_S390_VCPU_RESETS: case KVM_CAP_SET_GUEST_DEBUG: case KVM_CAP_S390_DIAG318: - case KVM_CAP_S390_MEM_OP_EXTENSION: r = 1; break; case KVM_CAP_SET_GUEST_DEBUG2: @@ -590,6 +589,14 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_S390_MEM_OP: r = MEM_OP_MAX_SIZE; break; + case KVM_CAP_S390_MEM_OP_EXTENSION: + /* + * Flag bits indicating which extensions are supported. + * The first extension doesn't use a flag, but pretend it does, + * this way that can be changed in the future. + */ + r = KVM_S390_MEMOP_EXTENSION_CAP_CMPXCHG | 1; + break; case KVM_CAP_NR_VCPUS: case KVM_CAP_MAX_VCPUS: case KVM_CAP_MAX_VCPU_ID: @@ -2714,12 +2721,19 @@ static bool access_key_invalid(u8 access_key) static int kvm_s390_vm_mem_op(struct kvm *kvm, struct kvm_s390_mem_op *mop) { void __user *uaddr = (void __user *)mop->buf; + void __user *old_addr = (void __user *)mop->old_addr; + union { + __uint128_t quad; + char raw[sizeof(__uint128_t)]; + } old = { .quad = 0}, new = { .quad = 0 }; + unsigned int off_in_quad = sizeof(new) - mop->size; u64 supported_flags; void *tmpbuf = NULL; int r, srcu_idx; supported_flags = KVM_S390_MEMOP_F_SKEY_PROTECTION - | KVM_S390_MEMOP_F_CHECK_ONLY; + | KVM_S390_MEMOP_F_CHECK_ONLY + | KVM_S390_MEMOP_F_CMPXCHG; if (mop->flags & ~supported_flags || !mop->size) return -EINVAL; if (mop->size > MEM_OP_MAX_SIZE) @@ -2741,6 +2755,19 @@ static int kvm_s390_vm_mem_op(struct kvm *kvm, struct kvm_s390_mem_op *mop) } else { mop->key = 0; } + if (mop->flags & KVM_S390_MEMOP_F_CMPXCHG) { + /* + * This validates off_in_quad. Checking that size is a power + * of two is not necessary, as cmpxchg_guest_abs_with_key + * takes care of that + */ + if (mop->size > sizeof(new)) + return -EINVAL; + if (copy_from_user(&new.raw[off_in_quad], uaddr, mop->size)) + return -EFAULT; + if (copy_from_user(&old.raw[off_in_quad], old_addr, mop->size)) + return -EFAULT; + } if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) { tmpbuf = vmalloc(mop->size); if (!tmpbuf) @@ -2771,6 +2798,14 @@ static int kvm_s390_vm_mem_op(struct kvm *kvm, struct kvm_s390_mem_op *mop) case KVM_S390_MEMOP_ABSOLUTE_WRITE: { if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) { r = check_gpa_range(kvm, mop->gaddr, mop->size, GACC_STORE, mop->key); + } else if (mop->flags & KVM_S390_MEMOP_F_CMPXCHG) { + r = cmpxchg_guest_abs_with_key(kvm, mop->gaddr, mop->size, + &old.quad, new.quad, mop->key); + if (r == 1) { + r = KVM_S390_MEMOP_R_NO_XCHG; + if (copy_to_user(old_addr, &old.raw[off_in_quad], mop->size)) + r = -EFAULT; + } } else { if (copy_from_user(tmpbuf, uaddr, mop->size)) { r = -EFAULT; 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Tue, 13 Dec 2022 16:54:13 +0000 (GMT) From: Janis Schoetterl-Glausch To: Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Heiko Carstens , Vasily Gorbik , Alexander Gordeev Cc: Janis Schoetterl-Glausch , David Hildenbrand , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-s390@vger.kernel.org, Paolo Bonzini , Shuah Khan , Sven Schnelle Subject: [PATCH v4 2/9] Documentation: KVM: s390: Describe KVM_S390_MEMOP_F_CMPXCHG Date: Tue, 13 Dec 2022 17:53:58 +0100 Message-Id: <20221213165405.2953539-3-scgl@linux.ibm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221213165405.2953539-1-scgl@linux.ibm.com> References: <20221213165405.2953539-1-scgl@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: y9rxpg2hT1ShmnreNGnXJrQYIpgnpjfH X-Proofpoint-ORIG-GUID: cdDGzcxPwSWI3eZo6yhfs8WiqVY4i8D5 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.923,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-12-13_03,2022-12-13_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1011 impostorscore=0 suspectscore=0 adultscore=0 bulkscore=0 phishscore=0 lowpriorityscore=0 priorityscore=1501 mlxlogscore=681 mlxscore=0 spamscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2210170000 definitions=main-2212130147 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Describe the semantics of the new KVM_S390_MEMOP_F_CMPXCHG flag for absolute vm write memops which allows user space to perform (storage key checked) cmpxchg operations on guest memory. Signed-off-by: Janis Schoetterl-Glausch --- Documentation/virt/kvm/api.rst | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index eee9f857a986..98f5a35088b8 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -3753,7 +3753,8 @@ The fields in each entry are defined as follows: :Parameters: struct kvm_s390_mem_op (in) :Returns: = 0 on success, < 0 on generic error (e.g. -EFAULT or -ENOMEM), - > 0 if an exception occurred while walking the page tables + 16 bit program exception code if the access causes such an exception + other code > 0xffff with special meaning Read or write data from/to the VM's memory. The KVM_CAP_S390_MEM_OP_EXTENSION capability specifies what functionality is @@ -3771,6 +3772,8 @@ Parameters are specified via the following structure:: struct { __u8 ar; /* the access register number */ __u8 key; /* access key, ignored if flag unset */ + __u8 pad1[6]; /* ignored */ + __u64 old_addr; /* ignored if flag unset */ }; __u32 sida_offset; /* offset into the sida */ __u8 reserved[32]; /* ignored */ @@ -3853,8 +3856,21 @@ Absolute accesses are permitted for non-protected guests only. Supported flags: * ``KVM_S390_MEMOP_F_CHECK_ONLY`` * ``KVM_S390_MEMOP_F_SKEY_PROTECTION`` + * ``KVM_S390_MEMOP_F_CMPXCHG`` + +The semantics of the flags common with logical accesses are as for logical +accesses. + +For write accesses, the KVM_S390_MEMOP_F_CMPXCHG flag is supported if +KVM_CAP_S390_MEM_OP_EXTENSION has flag KVM_S390_MEMOP_EXTENSION_CAP_CMPXCHG set. +In this case, instead of doing an unconditional write, the access occurs +only if the target location contains the value pointed to by "old_addr". +This is performed as an atomic cmpxchg with the length specified by the "size" +parameter. "size" must be a power of two up to and including 16. +If the exchange did not take place because the target value doesn't match the +old value, KVM_S390_MEMOP_R_NO_XCHG is returned. +In this case the value "old_addr" points to is replaced by the target value. -The semantics of the flags are as for logical accesses. SIDA read/write: ^^^^^^^^^^^^^^^^ From patchwork Tue Dec 13 16:54:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Janis Schoetterl-Glausch X-Patchwork-Id: 633803 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8045DC10F1B for ; Tue, 13 Dec 2022 16:54:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236232AbiLMQya (ORCPT ); Tue, 13 Dec 2022 11:54:30 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54976 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236271AbiLMQy0 (ORCPT ); Tue, 13 Dec 2022 11:54:26 -0500 Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CDBEC22506; 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Tue, 13 Dec 2022 16:54:13 +0000 (GMT) Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id AF0012004B; Tue, 13 Dec 2022 16:54:13 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by smtpav07.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 13 Dec 2022 16:54:13 +0000 (GMT) From: Janis Schoetterl-Glausch To: Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Heiko Carstens , Vasily Gorbik , Alexander Gordeev Cc: Janis Schoetterl-Glausch , David Hildenbrand , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-s390@vger.kernel.org, Paolo Bonzini , Shuah Khan , Sven Schnelle Subject: [PATCH v4 4/9] KVM: s390: selftest: memop: Replace macros by functions Date: Tue, 13 Dec 2022 17:54:00 +0100 Message-Id: <20221213165405.2953539-5-scgl@linux.ibm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221213165405.2953539-1-scgl@linux.ibm.com> References: <20221213165405.2953539-1-scgl@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: bqXbbHxqmjeDH5hWso7MHfrV79PaBluF X-Proofpoint-ORIG-GUID: 5j4yKOKbyAmP-05EN7rxq_9EaT-TNy2Y X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.923,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-12-13_03,2022-12-13_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 bulkscore=0 adultscore=0 phishscore=0 clxscore=1015 impostorscore=0 suspectscore=0 spamscore=0 lowpriorityscore=0 mlxlogscore=999 mlxscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2210170000 definitions=main-2212130147 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Replace the DEFAULT_* test helpers by functions, as they don't need the exta flexibility. Signed-off-by: Janis Schoetterl-Glausch Reviewed-by: Thomas Huth --- tools/testing/selftests/kvm/s390x/memop.c | 82 +++++++++++------------ 1 file changed, 39 insertions(+), 43 deletions(-) diff --git a/tools/testing/selftests/kvm/s390x/memop.c b/tools/testing/selftests/kvm/s390x/memop.c index 69869c7e2ab1..286185a59238 100644 --- a/tools/testing/selftests/kvm/s390x/memop.c +++ b/tools/testing/selftests/kvm/s390x/memop.c @@ -48,6 +48,8 @@ struct mop_desc { uint8_t key; }; +const uint8_t NO_KEY = 0xff; + static struct kvm_s390_mem_op ksmo_from_desc(const struct mop_desc *desc) { struct kvm_s390_mem_op ksmo = { @@ -85,7 +87,7 @@ static struct kvm_s390_mem_op ksmo_from_desc(const struct mop_desc *desc) ksmo.flags |= KVM_S390_MEMOP_F_INJECT_EXCEPTION; if (desc->_set_flags) ksmo.flags = desc->set_flags; - if (desc->f_key) { + if (desc->f_key && desc->key != NO_KEY) { ksmo.flags |= KVM_S390_MEMOP_F_SKEY_PROTECTION; ksmo.key = desc->key; } @@ -268,34 +270,28 @@ static void prepare_mem12(void) #define ASSERT_MEM_EQ(p1, p2, size) \ TEST_ASSERT(!memcmp(p1, p2, size), "Memory contents do not match!") -#define DEFAULT_WRITE_READ(copy_cpu, mop_cpu, mop_target_p, size, ...) \ -({ \ - struct test_info __copy_cpu = (copy_cpu), __mop_cpu = (mop_cpu); \ - enum mop_target __target = (mop_target_p); \ - uint32_t __size = (size); \ - \ - prepare_mem12(); \ - CHECK_N_DO(MOP, __mop_cpu, __target, WRITE, mem1, __size, \ - GADDR_V(mem1), ##__VA_ARGS__); \ - HOST_SYNC(__copy_cpu, STAGE_COPIED); \ - CHECK_N_DO(MOP, __mop_cpu, __target, READ, mem2, __size, \ - GADDR_V(mem2), ##__VA_ARGS__); \ - ASSERT_MEM_EQ(mem1, mem2, __size); \ -}) +static void default_write_read(struct test_info copy_cpu, struct test_info mop_cpu, + enum mop_target mop_target, uint32_t size, uint8_t key) +{ + prepare_mem12(); + CHECK_N_DO(MOP, mop_cpu, mop_target, WRITE, mem1, size, + GADDR_V(mem1), KEY(key)); + HOST_SYNC(copy_cpu, STAGE_COPIED); + CHECK_N_DO(MOP, mop_cpu, mop_target, READ, mem2, size, + GADDR_V(mem2), KEY(key)); + ASSERT_MEM_EQ(mem1, mem2, size); +} -#define DEFAULT_READ(copy_cpu, mop_cpu, mop_target_p, size, ...) \ -({ \ - struct test_info __copy_cpu = (copy_cpu), __mop_cpu = (mop_cpu); \ - enum mop_target __target = (mop_target_p); \ - uint32_t __size = (size); \ - \ - prepare_mem12(); \ - CHECK_N_DO(MOP, __mop_cpu, __target, WRITE, mem1, __size, \ - GADDR_V(mem1)); \ - HOST_SYNC(__copy_cpu, STAGE_COPIED); \ - CHECK_N_DO(MOP, __mop_cpu, __target, READ, mem2, __size, ##__VA_ARGS__);\ - ASSERT_MEM_EQ(mem1, mem2, __size); \ -}) +static void default_read(struct test_info copy_cpu, struct test_info mop_cpu, + enum mop_target mop_target, uint32_t size, uint8_t key) +{ + prepare_mem12(); + CHECK_N_DO(MOP, mop_cpu, mop_target, WRITE, mem1, size, GADDR_V(mem1)); + HOST_SYNC(copy_cpu, STAGE_COPIED); + CHECK_N_DO(MOP, mop_cpu, mop_target, READ, mem2, size, + GADDR_V(mem2), KEY(key)); + ASSERT_MEM_EQ(mem1, mem2, size); +} static void guest_copy(void) { @@ -310,7 +306,7 @@ static void test_copy(void) HOST_SYNC(t.vcpu, STAGE_INITED); - DEFAULT_WRITE_READ(t.vcpu, t.vcpu, LOGICAL, t.size); + default_write_read(t.vcpu, t.vcpu, LOGICAL, t.size, NO_KEY); kvm_vm_free(t.kvm_vm); } @@ -357,26 +353,26 @@ static void test_copy_key(void) HOST_SYNC(t.vcpu, STAGE_SKEYS_SET); /* vm, no key */ - DEFAULT_WRITE_READ(t.vcpu, t.vm, ABSOLUTE, t.size); + default_write_read(t.vcpu, t.vm, ABSOLUTE, t.size, NO_KEY); /* vm/vcpu, machting key or key 0 */ - DEFAULT_WRITE_READ(t.vcpu, t.vcpu, LOGICAL, t.size, KEY(0)); - DEFAULT_WRITE_READ(t.vcpu, t.vcpu, LOGICAL, t.size, KEY(9)); - DEFAULT_WRITE_READ(t.vcpu, t.vm, ABSOLUTE, t.size, KEY(0)); - DEFAULT_WRITE_READ(t.vcpu, t.vm, ABSOLUTE, t.size, KEY(9)); + default_write_read(t.vcpu, t.vcpu, LOGICAL, t.size, 0); + default_write_read(t.vcpu, t.vcpu, LOGICAL, t.size, 9); + default_write_read(t.vcpu, t.vm, ABSOLUTE, t.size, 0); + default_write_read(t.vcpu, t.vm, ABSOLUTE, t.size, 9); /* * There used to be different code paths for key handling depending on * if the region crossed a page boundary. * There currently are not, but the more tests the merrier. */ - DEFAULT_WRITE_READ(t.vcpu, t.vcpu, LOGICAL, 1, KEY(0)); - DEFAULT_WRITE_READ(t.vcpu, t.vcpu, LOGICAL, 1, KEY(9)); - DEFAULT_WRITE_READ(t.vcpu, t.vm, ABSOLUTE, 1, KEY(0)); - DEFAULT_WRITE_READ(t.vcpu, t.vm, ABSOLUTE, 1, KEY(9)); + default_write_read(t.vcpu, t.vcpu, LOGICAL, 1, 0); + default_write_read(t.vcpu, t.vcpu, LOGICAL, 1, 9); + default_write_read(t.vcpu, t.vm, ABSOLUTE, 1, 0); + default_write_read(t.vcpu, t.vm, ABSOLUTE, 1, 9); /* vm/vcpu, mismatching keys on read, but no fetch protection */ - DEFAULT_READ(t.vcpu, t.vcpu, LOGICAL, t.size, GADDR_V(mem2), KEY(2)); - DEFAULT_READ(t.vcpu, t.vm, ABSOLUTE, t.size, GADDR_V(mem1), KEY(2)); + default_read(t.vcpu, t.vcpu, LOGICAL, t.size, 2); + default_read(t.vcpu, t.vm, ABSOLUTE, t.size, 2); kvm_vm_free(t.kvm_vm); } @@ -409,7 +405,7 @@ static void test_copy_key_storage_prot_override(void) HOST_SYNC(t.vcpu, STAGE_SKEYS_SET); /* vcpu, mismatching keys, storage protection override in effect */ - DEFAULT_WRITE_READ(t.vcpu, t.vcpu, LOGICAL, t.size, KEY(2)); + default_write_read(t.vcpu, t.vcpu, LOGICAL, t.size, 2); kvm_vm_free(t.kvm_vm); } @@ -422,8 +418,8 @@ static void test_copy_key_fetch_prot(void) HOST_SYNC(t.vcpu, STAGE_SKEYS_SET); /* vm/vcpu, matching key, fetch protection in effect */ - DEFAULT_READ(t.vcpu, t.vcpu, LOGICAL, t.size, GADDR_V(mem2), KEY(9)); - DEFAULT_READ(t.vcpu, t.vm, ABSOLUTE, t.size, GADDR_V(mem2), KEY(9)); + default_read(t.vcpu, t.vcpu, LOGICAL, t.size, 9); + default_read(t.vcpu, t.vm, ABSOLUTE, t.size, 9); kvm_vm_free(t.kvm_vm); } From patchwork Tue Dec 13 16:54:02 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Janis Schoetterl-Glausch X-Patchwork-Id: 633802 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0DEF6C4708D for ; Tue, 13 Dec 2022 16:54:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236087AbiLMQyb (ORCPT ); Tue, 13 Dec 2022 11:54:31 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54982 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236277AbiLMQy1 (ORCPT ); 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Tue, 13 Dec 2022 16:54:14 GMT Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 804EF20043; Tue, 13 Dec 2022 16:54:14 +0000 (GMT) Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 37D702004B; Tue, 13 Dec 2022 16:54:14 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by smtpav07.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 13 Dec 2022 16:54:14 +0000 (GMT) From: Janis Schoetterl-Glausch To: Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Heiko Carstens , Vasily Gorbik , Alexander Gordeev Cc: Janis Schoetterl-Glausch , David Hildenbrand , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-s390@vger.kernel.org, Paolo Bonzini , Shuah Khan , Sven Schnelle Subject: [PATCH v4 6/9] KVM: s390: selftest: memop: Add cmpxchg tests Date: Tue, 13 Dec 2022 17:54:02 +0100 Message-Id: <20221213165405.2953539-7-scgl@linux.ibm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221213165405.2953539-1-scgl@linux.ibm.com> References: <20221213165405.2953539-1-scgl@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: Xxx2A7UWIOVlJCpPV4FWvtWMpGLNcoMp X-Proofpoint-ORIG-GUID: fwYePR9l6hXSyt7wz11uC-s5Idwp_WwA X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.923,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-12-13_03,2022-12-13_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 adultscore=0 impostorscore=0 mlxlogscore=999 priorityscore=1501 phishscore=0 spamscore=0 suspectscore=0 lowpriorityscore=0 clxscore=1015 bulkscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2210170000 definitions=main-2212130147 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Test successful exchange, unsuccessful exchange, storage key protection and invalid arguments. Signed-off-by: Janis Schoetterl-Glausch --- tools/testing/selftests/kvm/s390x/memop.c | 404 +++++++++++++++++++++- 1 file changed, 390 insertions(+), 14 deletions(-) diff --git a/tools/testing/selftests/kvm/s390x/memop.c b/tools/testing/selftests/kvm/s390x/memop.c index 10f34c629cac..b4e5c7016047 100644 --- a/tools/testing/selftests/kvm/s390x/memop.c +++ b/tools/testing/selftests/kvm/s390x/memop.c @@ -9,6 +9,7 @@ #include #include #include +#include #include @@ -44,6 +45,8 @@ struct mop_desc { enum mop_access_mode mode; void *buf; uint32_t sida_offset; + void *old; + bool *cmpxchg_success; uint8_t ar; uint8_t key; }; @@ -91,6 +94,10 @@ static struct kvm_s390_mem_op ksmo_from_desc(const struct mop_desc *desc) ksmo.flags |= KVM_S390_MEMOP_F_SKEY_PROTECTION; ksmo.key = desc->key; } + if (desc->old) { + ksmo.flags |= KVM_S390_MEMOP_F_CMPXCHG; + ksmo.old_addr = (uint64_t)desc->old; + } if (desc->_ar) ksmo.ar = desc->ar; else @@ -136,35 +143,45 @@ static void print_memop(struct kvm_vcpu *vcpu, const struct kvm_s390_mem_op *ksm printf("ABSOLUTE, WRITE, "); break; } - printf("gaddr=%llu, size=%u, buf=%llu, ar=%u, key=%u", - ksmo->gaddr, ksmo->size, ksmo->buf, ksmo->ar, ksmo->key); + printf("gaddr=%llu, size=%u, buf=%llu, ar=%u, key=%u, old_addr=%llx", + ksmo->gaddr, ksmo->size, ksmo->buf, ksmo->ar, ksmo->key, + ksmo->old_addr); if (ksmo->flags & KVM_S390_MEMOP_F_CHECK_ONLY) printf(", CHECK_ONLY"); if (ksmo->flags & KVM_S390_MEMOP_F_INJECT_EXCEPTION) printf(", INJECT_EXCEPTION"); if (ksmo->flags & KVM_S390_MEMOP_F_SKEY_PROTECTION) printf(", SKEY_PROTECTION"); + if (ksmo->flags & KVM_S390_MEMOP_F_CMPXCHG) + printf(", CMPXCHG"); puts(")"); } -static void memop_ioctl(struct test_info info, struct kvm_s390_mem_op *ksmo) +static int err_memop_ioctl(struct test_info info, struct kvm_s390_mem_op *ksmo, + struct mop_desc *desc) { struct kvm_vcpu *vcpu = info.vcpu; if (!vcpu) - vm_ioctl(info.vm, KVM_S390_MEM_OP, ksmo); + return __vm_ioctl(info.vm, KVM_S390_MEM_OP, ksmo); else - vcpu_ioctl(vcpu, KVM_S390_MEM_OP, ksmo); + return __vcpu_ioctl(vcpu, KVM_S390_MEM_OP, ksmo); } -static int err_memop_ioctl(struct test_info info, struct kvm_s390_mem_op *ksmo) +static void memop_ioctl(struct test_info info, struct kvm_s390_mem_op *ksmo, + struct mop_desc *desc) { - struct kvm_vcpu *vcpu = info.vcpu; + int r; + + r = err_memop_ioctl(info, ksmo, desc); + if (ksmo->flags & KVM_S390_MEMOP_F_CMPXCHG) { + if (desc->cmpxchg_success) + *desc->cmpxchg_success = !r; + if (r == KVM_S390_MEMOP_R_NO_XCHG) + r = 0; + } + TEST_ASSERT(!r, __KVM_IOCTL_ERROR("KVM_S390_MEM_OP", r)); - if (!vcpu) - return __vm_ioctl(info.vm, KVM_S390_MEM_OP, ksmo); - else - return __vcpu_ioctl(vcpu, KVM_S390_MEM_OP, ksmo); } #define MEMOP(err, info_p, mop_target_p, access_mode_p, buf_p, size_p, ...) \ @@ -187,7 +204,7 @@ static int err_memop_ioctl(struct test_info info, struct kvm_s390_mem_op *ksmo) } \ __ksmo = ksmo_from_desc(&__desc); \ print_memop(__info.vcpu, &__ksmo); \ - err##memop_ioctl(__info, &__ksmo); \ + err##memop_ioctl(__info, &__ksmo, &__desc); \ }) #define MOP(...) MEMOP(, __VA_ARGS__) @@ -201,6 +218,8 @@ static int err_memop_ioctl(struct test_info info, struct kvm_s390_mem_op *ksmo) #define AR(a) ._ar = 1, .ar = (a) #define KEY(a) .f_key = 1, .key = (a) #define INJECT .f_inject = 1 +#define CMPXCHG_OLD(o) .old = (o) +#define CMPXCHG_SUCCESS(s) .cmpxchg_success = (s) #define CHECK_N_DO(f, ...) ({ f(__VA_ARGS__, CHECK_ONLY); f(__VA_ARGS__); }) @@ -210,8 +229,8 @@ static int err_memop_ioctl(struct test_info info, struct kvm_s390_mem_op *ksmo) #define CR0_FETCH_PROTECTION_OVERRIDE (1UL << (63 - 38)) #define CR0_STORAGE_PROTECTION_OVERRIDE (1UL << (63 - 39)) -static uint8_t mem1[65536]; -static uint8_t mem2[65536]; +static uint8_t __aligned(PAGE_SIZE) mem1[65536]; +static uint8_t __aligned(PAGE_SIZE) mem2[65536]; struct test_default { struct kvm_vm *kvm_vm; @@ -243,6 +262,8 @@ enum stage { STAGE_SKEYS_SET, /* Guest copied memory (locations up to test case) */ STAGE_COPIED, + /* End of guest code reached */ + STAGE_DONE, }; #define HOST_SYNC(info_p, stage) \ @@ -254,6 +275,9 @@ enum stage { \ vcpu_run(__vcpu); \ get_ucall(__vcpu, &uc); \ + if (uc.cmd == UCALL_ABORT) { \ + REPORT_GUEST_ASSERT_2(uc, "hints: %lu, %lu"); \ + } \ ASSERT_EQ(uc.cmd, UCALL_SYNC); \ ASSERT_EQ(uc.args[1], __stage); \ }) \ @@ -293,6 +317,44 @@ static void default_read(struct test_info copy_cpu, struct test_info mop_cpu, ASSERT_MEM_EQ(mem1, mem2, size); } +static void default_cmpxchg(struct test_default *test, uint8_t key) +{ + for (int size = 1; size <= 16; size *= 2) { + for (int offset = 0; offset < 16; offset += size) { + uint8_t __aligned(16) new[16] = {}; + uint8_t __aligned(16) old[16]; + bool succ; + + prepare_mem12(); + default_write_read(test->vcpu, test->vcpu, LOGICAL, 16, NO_KEY); + + memcpy(&old, mem1, 16); + CHECK_N_DO(MOP, test->vm, ABSOLUTE, WRITE, new + offset, + size, GADDR_V(mem1 + offset), + CMPXCHG_OLD(old + offset), + CMPXCHG_SUCCESS(&succ), KEY(key)); + HOST_SYNC(test->vcpu, STAGE_COPIED); + MOP(test->vm, ABSOLUTE, READ, mem2, 16, GADDR_V(mem2)); + TEST_ASSERT(succ, "exchange of values should succeed"); + memcpy(mem1 + offset, new + offset, size); + ASSERT_MEM_EQ(mem1, mem2, 16); + + memcpy(&old, mem1, 16); + new[offset]++; + old[offset]++; + CHECK_N_DO(MOP, test->vm, ABSOLUTE, WRITE, new + offset, + size, GADDR_V(mem1 + offset), + CMPXCHG_OLD(old + offset), + CMPXCHG_SUCCESS(&succ), KEY(key)); + HOST_SYNC(test->vcpu, STAGE_COPIED); + MOP(test->vm, ABSOLUTE, READ, mem2, 16, GADDR_V(mem2)); + TEST_ASSERT(!succ, "exchange of values should not succeed"); + ASSERT_MEM_EQ(mem1, mem2, 16); + ASSERT_MEM_EQ(&old, mem1, 16); + } + } +} + static void guest_copy(void) { GUEST_SYNC(STAGE_INITED); @@ -377,6 +439,250 @@ static void test_copy_key(void) kvm_vm_free(t.kvm_vm); } +static void test_cmpxchg_key(void) +{ + struct test_default t = test_default_init(guest_copy_key); + + HOST_SYNC(t.vcpu, STAGE_SKEYS_SET); + + default_cmpxchg(&t, NO_KEY); + default_cmpxchg(&t, 0); + default_cmpxchg(&t, 9); + + kvm_vm_free(t.kvm_vm); +} + +static __uint128_t cut_to_size(int size, __uint128_t val) +{ + switch (size) { + case 1: + return (uint8_t)val; + case 2: + return (uint16_t)val; + case 4: + return (uint32_t)val; + case 8: + return (uint64_t)val; + case 16: + return val; + } + GUEST_ASSERT_1(false, "Invalid size"); + return 0; +} + +static bool popcount_eq(__uint128_t a, __uint128_t b) +{ + unsigned int count_a, count_b; + + count_a = __builtin_popcountl((uint64_t)(a >> 64)) + + __builtin_popcountl((uint64_t)a); + count_b = __builtin_popcountl((uint64_t)(b >> 64)) + + __builtin_popcountl((uint64_t)b); + return count_a == count_b; +} + +static __uint128_t rotate(int size, __uint128_t val, int amount) +{ + unsigned int bits = size * 8; + + amount = (amount + bits) % bits; + val = cut_to_size(size, val); + return (val << (bits - amount)) | (val >> amount); +} + +const unsigned int max_block = 16; + +static void choose_block(bool guest, int i, int *size, int *offset) +{ + unsigned int rand; + + rand = i; + if (guest) { + rand = rand * 19 + 11; + *size = 1 << ((rand % 3) + 2); + rand = rand * 19 + 11; + *offset = (rand % max_block) & ~(*size - 1); + } else { + rand = rand * 17 + 5; + *size = 1 << (rand % 5); + rand = rand * 17 + 5; + *offset = (rand % max_block) & ~(*size - 1); + } +} + +static __uint128_t permutate_bits(bool guest, int i, int size, __uint128_t old) +{ + unsigned int rand; + bool swap; + + rand = i; + rand = rand * 3 + 1; + if (guest) + rand = rand * 3 + 1; + swap = rand % 2 == 0; + if (swap) { + int i, j; + __uint128_t new; + uint8_t byte0, byte1; + + rand = rand * 3 + 1; + i = rand % size; + rand = rand * 3 + 1; + j = rand % size; + if (i == j) + return old; + new = rotate(16, old, i * 8); + byte0 = new & 0xff; + new &= ~0xff; + new = rotate(16, new, -i * 8); + new = rotate(16, new, j * 8); + byte1 = new & 0xff; + new = (new & ~0xff) | byte0; + new = rotate(16, new, -j * 8); + new = rotate(16, new, i * 8); + new = new | byte1; + new = rotate(16, new, -i * 8); + return new; + } else { + int amount; + + rand = rand * 3 + 1; + amount = rand % (size * 8); + return rotate(size, old, amount); + } +} + +static bool _cmpxchg(int size, void *target, __uint128_t *old_addr, __uint128_t new) +{ + bool ret; + + switch (size) { + case 4: { + uint32_t old = *old_addr; + + asm volatile ("cs %[old],%[new],%[address]" + : [old] "+d" (old), + [address] "+Q" (*(uint32_t *)(target)) + : [new] "d" ((uint32_t)new) + : "cc" + ); + ret = old == (uint32_t)*old_addr; + *old_addr = old; + return ret; + } + case 8: { + uint64_t old = *old_addr; + + asm volatile ("csg %[old],%[new],%[address]" + : [old] "+d" (old), + [address] "+Q" (*(uint64_t *)(target)) + : [new] "d" ((uint64_t)new) + : "cc" + ); + ret = old == (uint64_t)*old_addr; + *old_addr = old; + return ret; + } + case 16: { + __uint128_t old = *old_addr; + + asm volatile ("cdsg %[old],%[new],%[address]" + : [old] "+d" (old), + [address] "+Q" (*(__uint128_t *)(target)) + : [new] "d" (new) + : "cc" + ); + ret = old == *old_addr; + *old_addr = old; + return ret; + } + } + GUEST_ASSERT_1(false, "Invalid size"); + return 0; +} + +const unsigned int cmpxchg_iter_outer = 100, cmpxchg_iter_inner = 10000; + +static void guest_cmpxchg_key(void) +{ + int size, offset; + __uint128_t old, new; + + set_storage_key_range(mem1, max_block, 0x10); + set_storage_key_range(mem2, max_block, 0x10); + GUEST_SYNC(STAGE_SKEYS_SET); + + for (int i = 0; i < cmpxchg_iter_outer; i++) { + do { + old = 1; + } while (!_cmpxchg(16, mem1, &old, 0)); + for (int j = 0; j < cmpxchg_iter_inner; j++) { + choose_block(true, i + j, &size, &offset); + do { + new = permutate_bits(true, i + j, size, old); + } while (!_cmpxchg(size, mem2 + offset, &old, new)); + } + } + + GUEST_SYNC(STAGE_DONE); +} + +static void *run_guest(void *data) +{ + struct test_info *info = data; + + HOST_SYNC(*info, STAGE_DONE); + return NULL; +} + +static char *quad_to_char(__uint128_t *quad, int size) +{ + return ((char *)quad) + (sizeof(*quad) - size); +} + +static void test_cmpxchg_key_concurrent(void) +{ + struct test_default t = test_default_init(guest_cmpxchg_key); + int size, offset; + __uint128_t old, new; + bool success; + pthread_t thread; + + HOST_SYNC(t.vcpu, STAGE_SKEYS_SET); + prepare_mem12(); + MOP(t.vcpu, LOGICAL, WRITE, mem1, max_block, GADDR_V(mem2)); + pthread_create(&thread, NULL, run_guest, &t.vcpu); + + for (int i = 0; i < cmpxchg_iter_outer; i++) { + do { + old = 0; + new = 1; + MOP(t.vm, ABSOLUTE, WRITE, &new, + sizeof(new), GADDR_V(mem1), + CMPXCHG_OLD(&old), + CMPXCHG_SUCCESS(&success), KEY(1)); + } while (!success); + for (int j = 0; j < cmpxchg_iter_inner; j++) { + choose_block(false, i + j, &size, &offset); + do { + new = permutate_bits(false, i + j, size, old); + MOP(t.vm, ABSOLUTE, WRITE, quad_to_char(&new, size), + size, GADDR_V(mem2 + offset), + CMPXCHG_OLD(quad_to_char(&old, size)), + CMPXCHG_SUCCESS(&success), KEY(1)); + } while (!success); + } + } + + pthread_join(thread, NULL); + + MOP(t.vcpu, LOGICAL, READ, mem2, max_block, GADDR_V(mem2)); + TEST_ASSERT(popcount_eq(*(__uint128_t *)mem1, *(__uint128_t *)mem2), + "Must retain number of set bits"); + + kvm_vm_free(t.kvm_vm); +} + static void guest_copy_key_fetch_prot(void) { /* @@ -457,6 +763,24 @@ static void test_errors_key(void) kvm_vm_free(t.kvm_vm); } +static void test_errors_cmpxchg_key(void) +{ + struct test_default t = test_default_init(guest_copy_key_fetch_prot); + int i; + + HOST_SYNC(t.vcpu, STAGE_INITED); + HOST_SYNC(t.vcpu, STAGE_SKEYS_SET); + + for (i = 1; i <= 16; i *= 2) { + __uint128_t old = 0; + + CHECK_N_DO(ERR_PROT_MOP, t.vm, ABSOLUTE, WRITE, mem2, i, GADDR_V(mem2), + CMPXCHG_OLD(&old), KEY(2)); + } + + kvm_vm_free(t.kvm_vm); +} + static void test_termination(void) { struct test_default t = test_default_init(guest_error_key); @@ -690,6 +1014,38 @@ static void test_errors(void) kvm_vm_free(t.kvm_vm); } +static void test_errors_cmpxchg(void) +{ + struct test_default t = test_default_init(guest_idle); + __uint128_t old; + int rv, i, power = 1; + + HOST_SYNC(t.vcpu, STAGE_INITED); + + for (i = 0; i < 32; i++) { + if (i == power) { + power *= 2; + continue; + } + rv = ERR_MOP(t.vm, ABSOLUTE, WRITE, mem1, i, GADDR_V(mem1), + CMPXCHG_OLD(&old)); + TEST_ASSERT(rv == -1 && errno == EINVAL, + "ioctl allows bad size for cmpxchg"); + } + for (i = 1; i <= 16; i *= 2) { + rv = ERR_MOP(t.vm, ABSOLUTE, WRITE, mem1, i, GADDR((void *)~0xfffUL), + CMPXCHG_OLD(&old)); + TEST_ASSERT(rv > 0, "ioctl allows bad guest address for cmpxchg"); + } + for (i = 2; i <= 16; i *= 2) { + rv = ERR_MOP(t.vm, ABSOLUTE, WRITE, mem1, i, GADDR_V(mem1 + 1), + CMPXCHG_OLD(&old)); + TEST_ASSERT(rv == -1 && errno == EINVAL, + "ioctl allows bad alignment for cmpxchg"); + } + + kvm_vm_free(t.kvm_vm); +} int main(int argc, char *argv[]) { @@ -719,6 +1075,16 @@ int main(int argc, char *argv[]) .test = test_copy_key, .requirements_met = extension_cap > 0, }, + { + .name = "cmpxchg with storage keys", + .test = test_cmpxchg_key, + .requirements_met = extension_cap & 0x2, + }, + { + .name = "concurrently cmpxchg with storage keys", + .test = test_cmpxchg_key_concurrent, + .requirements_met = extension_cap & 0x2, + }, { .name = "copy with key storage protection override", .test = test_copy_key_storage_prot_override, @@ -739,6 +1105,16 @@ int main(int argc, char *argv[]) .test = test_errors_key, .requirements_met = extension_cap > 0, }, + { + .name = "error checks for cmpxchg with key", + .test = test_errors_cmpxchg_key, + .requirements_met = extension_cap & 0x2, + }, + { + .name = "error checks for cmpxchg", + .test = test_errors_cmpxchg, + .requirements_met = extension_cap & 0x2, + }, { .name = "termination", .test = test_termination, From patchwork Tue Dec 13 16:54:04 2022 Content-Type: text/plain; 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Tue, 13 Dec 2022 16:54:14 +0000 (GMT) From: Janis Schoetterl-Glausch To: Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Heiko Carstens , Vasily Gorbik , Alexander Gordeev Cc: Janis Schoetterl-Glausch , David Hildenbrand , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-s390@vger.kernel.org, Paolo Bonzini , Shuah Khan , Sven Schnelle , Thomas Huth , Nico Boehr Subject: [PATCH v4 8/9] KVM: s390: selftest: memop: Fix typo Date: Tue, 13 Dec 2022 17:54:04 +0100 Message-Id: <20221213165405.2953539-9-scgl@linux.ibm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221213165405.2953539-1-scgl@linux.ibm.com> References: <20221213165405.2953539-1-scgl@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 3sUscx6AjQDBlh-pO8XXIzMXZz8pLwxy X-Proofpoint-ORIG-GUID: rt6l6T182-Iv2JqTAj2N9JqrLn2-jxFO X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.923,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-12-13_03,2022-12-13_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 impostorscore=0 malwarescore=0 bulkscore=0 mlxlogscore=953 lowpriorityscore=0 mlxscore=0 priorityscore=1501 clxscore=1015 phishscore=0 suspectscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2210170000 definitions=main-2212130147 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org "acceeded" isn't a word, should be "exceeded". Signed-off-by: Janis Schoetterl-Glausch Reviewed-by: Thomas Huth Reviewed-by: Nico Boehr --- tools/testing/selftests/kvm/s390x/memop.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/kvm/s390x/memop.c b/tools/testing/selftests/kvm/s390x/memop.c index 23a935cd8832..13c8be28e0cb 100644 --- a/tools/testing/selftests/kvm/s390x/memop.c +++ b/tools/testing/selftests/kvm/s390x/memop.c @@ -926,7 +926,7 @@ static void test_errors_key_fetch_prot_override_enabled(void) /* * vcpu, mismatching keys on fetch, - * fetch protection override does not apply because memory range acceeded + * fetch protection override does not apply because memory range exceeded */ CHECK_N_DO(ERR_PROT_MOP, t.vcpu, LOGICAL, READ, mem2, 2048 + 1, GADDR_V(0), KEY(2)); CHECK_N_DO(ERR_PROT_MOP, t.vcpu, LOGICAL, READ, mem2, PAGE_SIZE + 2048 + 1,