From patchwork Wed Oct 2 14:15:54 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nico Boehr X-Patchwork-Id: 13819858 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 D14E01D0F70; Wed, 2 Oct 2024 14:16:22 +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=1727878584; cv=none; b=EiWqxQ2ddGfu5CwWwvnBUioXohCZBLChmAINJzp8exLyxU1kDi9+Ok8jgdrLAuhPpCIeumBa134FnSUMuEUXoODaWgfLcLsYry/kG/uZkVgK8CkKqm5Ws0HLAdGtpwCU7JOLglahcEbkNv9LyxmhXTi2OdL6mSw8jX4vekAwPaY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727878584; c=relaxed/simple; bh=60AIUvEIO5ShnTtq9IwCjZTgsZLM713StqdUbqvB79M=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rlrac1MfkjZLlqr+wMCzUmxIlRRkRngoOlUFuLGE9p+W/z4f8ckKV3QSvh0wxyN2PS3vrOuDKU15IgXYxYtDMTUA/zJ+5/0lzdKwrUwy57+zaGIZvGR/2X66nSKj16GHSy3ggKgmWQe1oywuBgOtKPpGLT7OeU21LjPle0M6fNs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com; spf=pass smtp.mailfrom=linux.ibm.com; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b=JxB5Mq83; arc=none smtp.client-ip=148.163.156.1 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="JxB5Mq83" Received: from pps.filterd (m0353729.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 492E3nbX028187; Wed, 2 Oct 2024 14:16:22 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from :to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; s=pp1; bh=A7ZMEdNmTgiN7 NsGdNH6Pv8P47YEkBKClc7VeU53JJg=; b=JxB5Mq83UjVcT9wphw9ntkKlYNeSt fpqs7kfobk7zBV5rSx/PaNo0LTUJwUPc57TJNxh6uniEkYE0JVMFtEVCOcGIfwlO MJ/XTG/GGTxOMnZvVB4EHqBErdT6JOAEJ33oWfz9aL+jd0GxOLYe6DbL31zfNjag 6LXXNqvpGuehsuYjfhHiq83pz9ZZUo7p5geB2ljQ5AEkN7i84KOALD2OMDNtoCCV /C5x2b+QPOydgJt0LmWexMbsBH2fSWUsle30ob5HfxFGTe4yw+CT/2LOiqLq4t0v zQS73ElOjNMb5sXRVcX6EfNj6idM+5Qid7YXzjB1KpipKEUA/fRdmPn0A== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4217kv82dp-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Oct 2024 14:16:21 +0000 (GMT) Received: from m0353729.ppops.net (m0353729.ppops.net [127.0.0.1]) by pps.reinject (8.18.0.8/8.18.0.8) with ESMTP id 492EGLbx018353; Wed, 2 Oct 2024 14:16:21 GMT Received: from ppma11.dal12v.mail.ibm.com (db.9e.1632.ip4.static.sl-reverse.com [50.22.158.219]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4217kv82dd-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Oct 2024 14:16:21 +0000 (GMT) Received: from pps.filterd (ppma11.dal12v.mail.ibm.com [127.0.0.1]) by ppma11.dal12v.mail.ibm.com (8.18.1.2/8.18.1.2) with ESMTP id 492BVeUc002356; Wed, 2 Oct 2024 14:16:20 GMT Received: from smtprelay02.fra02v.mail.ibm.com ([9.218.2.226]) by ppma11.dal12v.mail.ibm.com (PPS) with ESMTPS id 41xxu1abyg-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Oct 2024 14:16:20 +0000 Received: from smtpav06.fra02v.mail.ibm.com (smtpav06.fra02v.mail.ibm.com [10.20.54.105]) by smtprelay02.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 492EGGK344171634 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 2 Oct 2024 14:16:17 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D561520040; Wed, 2 Oct 2024 14:16:16 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 992362004D; Wed, 2 Oct 2024 14:16:16 +0000 (GMT) Received: from t35lp63.lnxne.boe (unknown [9.152.108.100]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 2 Oct 2024 14:16:16 +0000 (GMT) From: Nico Boehr To: frankja@linux.ibm.com, imbrenda@linux.ibm.com, thuth@redhat.com Cc: kvm@vger.kernel.org, linux-s390@vger.kernel.org Subject: [kvm-unit-tests PATCH v3 1/2] s390x: edat: move LC_SIZE to arch_def.h Date: Wed, 2 Oct 2024 16:15:54 +0200 Message-ID: <20241002141616.357618-2-nrb@linux.ibm.com> X-Mailer: git-send-email 2.46.2 In-Reply-To: <20241002141616.357618-1-nrb@linux.ibm.com> References: <20241002141616.357618-1-nrb@linux.ibm.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: Sct7xCrlz7-wnX49Whn5u2aimbBHVEnp X-Proofpoint-ORIG-GUID: J5fTcUqgqU0T78JX8JIA185ytliycGip X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-02_13,2024-09-30_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 impostorscore=0 phishscore=0 mlxlogscore=999 adultscore=0 lowpriorityscore=0 priorityscore=1501 clxscore=1011 spamscore=0 mlxscore=0 suspectscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2408220000 definitions=main-2410020099 struct lowcore is defined in arch_def.h and LC_SIZE is useful to other tests as well, therefore move it to arch_def.h. Signed-off-by: Nico Boehr Reviewed-by: Claudio Imbrenda --- lib/s390x/asm/arch_def.h | 1 + s390x/edat.c | 1 - 2 files changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/s390x/asm/arch_def.h b/lib/s390x/asm/arch_def.h index 745a33878de5..5574a45156a9 100644 --- a/lib/s390x/asm/arch_def.h +++ b/lib/s390x/asm/arch_def.h @@ -119,6 +119,7 @@ enum address_space { #define CTL2_GUARDED_STORAGE (63 - 59) +#define LC_SIZE (2 * PAGE_SIZE) struct lowcore { uint8_t pad_0x0000[0x0080 - 0x0000]; /* 0x0000 */ uint32_t ext_int_param; /* 0x0080 */ diff --git a/s390x/edat.c b/s390x/edat.c index 16138397017c..e664b09d9633 100644 --- a/s390x/edat.c +++ b/s390x/edat.c @@ -17,7 +17,6 @@ #define PGD_PAGE_SHIFT (REGION1_SHIFT - PAGE_SHIFT) -#define LC_SIZE (2 * PAGE_SIZE) #define VIRT(x) ((void *)((unsigned long)(x) + (unsigned long)mem)) static uint8_t prefix_buf[LC_SIZE] __attribute__((aligned(LC_SIZE))); From patchwork Wed Oct 2 14:15:55 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nico Boehr X-Patchwork-Id: 13819860 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 B67A01D0E3D; Wed, 2 Oct 2024 14:16:24 +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=1727878587; cv=none; b=bhe1sheZ8MWMZmEC6WPfM/Za/4W8qLBGtjDgB8/7SPcSHA56xZ3+4oqukCZ8+rDXNQAMkV5OeMwOE16kkXVh+dy44t2q8CzYvE0dcrP+PTxZHPGsf1feR6XWkx8MhOfCQmQB4ikYGMT9QdpRrO4wNo0MKXR44dfrI8QOQJt8G4I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727878587; c=relaxed/simple; bh=0TVLWxheztXuVLC7uknwWEFzP1220+vfbbLQfcZVvzY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ajyuDT85BrlGvnoBD1Dj0qk4ZZSP4ljLEzCQVdbhQTt7d9xR6hnA5js5DWsV97XZT0s+ym7OXvuZ7Wza5YWw5JjNBbvZbOrGeuKPCUgMFB1hOeVoEqi6Z/Y+ENOCO5GKu04hUOUHXIOhtc4lEQQGB7vDATFeoZRT07aYQg/7Kuo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com; spf=pass smtp.mailfrom=linux.ibm.com; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b=YRmGHkrg; arc=none smtp.client-ip=148.163.158.5 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="YRmGHkrg" Received: from pps.filterd (m0356516.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 492DP7g5026559; Wed, 2 Oct 2024 14:16:23 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from :to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; s=pp1; bh=BSPxsg6Se/DCN CLohr6euOKPFKc5GT6JC1gAdofE55Q=; b=YRmGHkrgt99fHYLFtAxwzN/VPjtE6 J7HW5FNV3PjHjIbJFQx33Gv1I+2/5LwG1DamQHj7GnA79RIJEohAs6zx9X6eI7ua ecxpVIEeeub76NKMQb2xkbIkpxTsldee+JZvt+ejoobSehfWh2zxrGmOAQ3J5kqt xuIT8gEJbwig15N0UJE94MmjnAcO2b5nlosOHYVa6zexGT4pI7P5kGMEQBrYh1kS NNt7r8ts2YXj71qrItTZkXZYteveXRMGt9coEZWy7bqZxEN+irXX18kVS0gFxqiQ DAJEs3d65iLj/eE+ow5W3F4MbwGuhJBcbFigAkQK1PmpSQ/U5xe2NE1Xg== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 42171t08jh-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Oct 2024 14:16:23 +0000 (GMT) Received: from m0356516.ppops.net (m0356516.ppops.net [127.0.0.1]) by pps.reinject (8.18.0.8/8.18.0.8) with ESMTP id 492EGNji024650; Wed, 2 Oct 2024 14:16:23 GMT Received: from ppma12.dal12v.mail.ibm.com (dc.9e.1632.ip4.static.sl-reverse.com [50.22.158.220]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 42171t08jb-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Oct 2024 14:16:23 +0000 (GMT) Received: from pps.filterd (ppma12.dal12v.mail.ibm.com [127.0.0.1]) by ppma12.dal12v.mail.ibm.com (8.18.1.2/8.18.1.2) with ESMTP id 492CU8iX020410; Wed, 2 Oct 2024 14:16:22 GMT Received: from smtprelay03.fra02v.mail.ibm.com ([9.218.2.224]) by ppma12.dal12v.mail.ibm.com (PPS) with ESMTPS id 41xv4saxvr-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Oct 2024 14:16:22 +0000 Received: from smtpav06.fra02v.mail.ibm.com (smtpav06.fra02v.mail.ibm.com [10.20.54.105]) by smtprelay03.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 492EGHte55837116 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 2 Oct 2024 14:16:17 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 269F320040; Wed, 2 Oct 2024 14:16:17 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E28C02004E; Wed, 2 Oct 2024 14:16:16 +0000 (GMT) Received: from t35lp63.lnxne.boe (unknown [9.152.108.100]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 2 Oct 2024 14:16:16 +0000 (GMT) From: Nico Boehr To: frankja@linux.ibm.com, imbrenda@linux.ibm.com, thuth@redhat.com Cc: kvm@vger.kernel.org, linux-s390@vger.kernel.org Subject: [kvm-unit-tests PATCH v3 2/2] s390x: add test for diag258 Date: Wed, 2 Oct 2024 16:15:55 +0200 Message-ID: <20241002141616.357618-3-nrb@linux.ibm.com> X-Mailer: git-send-email 2.46.2 In-Reply-To: <20241002141616.357618-1-nrb@linux.ibm.com> References: <20241002141616.357618-1-nrb@linux.ibm.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: 2lChwdicbgB0IRLF_361Hiq2dvvEaHfN X-Proofpoint-GUID: L_dM-_scyL5qj_4xCeh_MISyky0OxhKF X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-02_14,2024-09-30_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 priorityscore=1501 bulkscore=0 spamscore=0 adultscore=0 clxscore=1015 lowpriorityscore=0 mlxlogscore=999 phishscore=0 malwarescore=0 impostorscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2408220000 definitions=main-2410020103 This adds a test for diag258 (page ref service/async page fault). There recently was a virtual-real address confusion bug, so we should test: - diag258 parameter Rx is a real adress - crossing the end of RAM with the parameter list yields an addressing exception - invalid diagcode in the parameter block yields an specification exception - diag258 correctly applies prefixing. Note that we're just testing error cases as of now. Signed-off-by: Nico Boehr --- s390x/Makefile | 1 + s390x/diag258.c | 259 ++++++++++++++++++++++++++++++++++++++++++++ s390x/unittests.cfg | 3 + 3 files changed, 263 insertions(+) create mode 100644 s390x/diag258.c diff --git a/s390x/Makefile b/s390x/Makefile index 23342bd64f44..66d71351caab 100644 --- a/s390x/Makefile +++ b/s390x/Makefile @@ -44,6 +44,7 @@ tests += $(TEST_DIR)/exittime.elf tests += $(TEST_DIR)/ex.elf tests += $(TEST_DIR)/topology.elf tests += $(TEST_DIR)/sie-dat.elf +tests += $(TEST_DIR)/diag258.elf pv-tests += $(TEST_DIR)/pv-diags.elf pv-tests += $(TEST_DIR)/pv-icptcode.elf diff --git a/s390x/diag258.c b/s390x/diag258.c new file mode 100644 index 000000000000..1342b39a04fc --- /dev/null +++ b/s390x/diag258.c @@ -0,0 +1,259 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Diag 258: Async Page Fault Handler + * + * Copyright (c) 2024 IBM Corp + * + * Authors: + * Nico Boehr + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static uint8_t prefix_buf[LC_SIZE] __attribute__((aligned(LC_SIZE))); + +#define __PF_RES_FIELD 0x8000000000000000UL + +/* copied from Linux arch/s390/mm/pfault.c */ +struct pfault_refbk { + u16 refdiagc; + u16 reffcode; + u16 refdwlen; + u16 refversn; + u64 refgaddr; + u64 refselmk; + u64 refcmpmk; + u64 reserved; +}; + +uint64_t pfault_token = 0x0123fadec0fe3210UL; + +static struct pfault_refbk pfault_init_refbk __attribute__((aligned(8))) = { + .refdiagc = 0x258, + .reffcode = 0, /* TOKEN */ + .refdwlen = sizeof(struct pfault_refbk) / sizeof(uint64_t), + .refversn = 2, + .refgaddr = (u64)&pfault_token, + .refselmk = 1UL << 48, + .refcmpmk = 1UL << 48, + .reserved = __PF_RES_FIELD +}; + +static struct pfault_refbk pfault_cancel_refbk __attribute((aligned(8))) = { + .refdiagc = 0x258, + .reffcode = 1, /* CANCEL */ + .refdwlen = sizeof(struct pfault_refbk) / sizeof(uint64_t), + .refversn = 2, + .refgaddr = 0, + .refselmk = 0, + .refcmpmk = 0, + .reserved = 0 +}; + +static inline int diag258(struct pfault_refbk *refbk) +{ + int rc = -1; + + asm volatile( + " diag %[refbk],%[rc],0x258\n" + : [rc] "+d" (rc) + : [refbk] "a" (refbk), "m" (*(refbk)) + : "cc"); + return rc; +} + +static void test_priv(void) +{ + report_prefix_push("privileged"); + expect_pgm_int(); + enter_pstate(); + diag258(&pfault_init_refbk); + check_pgm_int_code(PGM_INT_CODE_PRIVILEGED_OPERATION); + report_prefix_pop(); +} + +static void* page_map_outside_real_space(phys_addr_t page_real) +{ + pgd_t *root = (pgd_t *)(stctg(1) & PAGE_MASK); + void* vaddr = alloc_vpage(); + + install_page(root, page_real, vaddr); + + return vaddr; +} + +/* + * Verify that the refbk pointer is a real address and not a virtual + * address. This is tested by enabling DAT and establishing a mapping + * for the refbk that is outside of the bounds of our (guest-)physical + * address space. + */ +static void test_refbk_real(void) +{ + struct pfault_refbk *refbk; + void *refbk_page; + pgd_t *root; + + report_prefix_push("refbk is real"); + + /* Set up virtual memory and allocate a physical page for storing the refbk */ + setup_vm(); + refbk_page = alloc_page(); + + /* Map refblk page outside of physical memory identity mapping */ + root = (pgd_t *)(stctg(1) & PAGE_MASK); + refbk = page_map_outside_real_space(virt_to_pte_phys(root, refbk_page)); + + /* Assert the mapping really is outside identity mapping */ + report_info("refbk is at 0x%lx", (u64)refbk); + report_info("ram size is 0x%lx", get_ram_size()); + assert((u64)refbk > get_ram_size()); + + /* Copy the init refbk to the page */ + memcpy(refbk, &pfault_init_refbk, sizeof(struct pfault_refbk)); + + /* Protect the virtual mapping to avoid diag258 actually doing something */ + protect_page(refbk, PAGE_ENTRY_I); + + expect_pgm_int(); + diag258(refbk); + check_pgm_int_code(PGM_INT_CODE_ADDRESSING); + report_prefix_pop(); + + free_page(refbk_page); + disable_dat(); + irq_set_dat_mode(false, 0); +} + +/* + * Verify diag258 correctly applies prefixing. + */ +static void test_refbk_prefixing(void) +{ + const size_t lowcore_offset_for_refbk = offsetof(struct lowcore, pad_0x03a0); + struct pfault_refbk *refbk_in_prefix, *refbk_in_reverse_prefix; + uint32_t old_prefix; + uint64_t ry; + + report_prefix_push("refbk prefixing"); + + report_info("refbk at lowcore offset 0x%lx", lowcore_offset_for_refbk); + + assert((unsigned long)&prefix_buf < SZ_2G); + + memcpy(prefix_buf, 0, LC_SIZE); + + /* + * After the call to set_prefix() below, this will refer to absolute + * address lowcore_offset_for_refbk (reverse prefixing). + */ + refbk_in_reverse_prefix = (struct pfault_refbk *)(&prefix_buf[0] + lowcore_offset_for_refbk); + + /* + * After the call to set_prefix() below, this will refer to absolute + * address &prefix_buf[0] + lowcore_offset_for_refbk (forward prefixing). + */ + refbk_in_prefix = (struct pfault_refbk *)OPAQUE_PTR(lowcore_offset_for_refbk); + + old_prefix = get_prefix(); + set_prefix((uint32_t)(uintptr_t)prefix_buf); + + /* + * If diag258 would not be applying prefixing on access to + * refbk_in_reverse_prefix correctly, it would access absolute address + * refbk_in_reverse_prefix (which to us is accessible at real address + * refbk_in_prefix). + * Make sure it really fails by putting invalid function code + * at refbk_in_prefix. + */ + refbk_in_prefix->refdiagc = 0xc0fe; + + /* + * Put a valid refbk at refbk_in_reverse_prefix. + */ + memcpy(refbk_in_reverse_prefix, &pfault_init_refbk, sizeof(pfault_init_refbk)); + + ry = diag258(refbk_in_reverse_prefix); + report(!ry, "real address refbk accessed"); + + /* + * Activating should have worked. Cancel the activation and expect + * return 0. If activation would not have worked, this should return with + * 4 (pfault handshaking not active). + */ + ry = diag258(&pfault_cancel_refbk); + report(!ry, "handshaking canceled"); + + set_prefix(old_prefix); + + report_prefix_pop(); +} + +/* + * Verify that a refbk exceeding physical memory is not accepted, even + * when crossing a frame boundary. + */ +static void test_refbk_crossing(void) +{ + const size_t bytes_in_last_page = 8; + struct pfault_refbk *refbk = (struct pfault_refbk *)(get_ram_size() - bytes_in_last_page); + + report_prefix_push("refbk crossing"); + + report_info("refbk is at 0x%lx", (u64)refbk); + report_info("ram size is 0x%lx", get_ram_size()); + assert(sizeof(struct pfault_refbk) > bytes_in_last_page); + + /* Copy bytes_in_last_page bytes of the init refbk to the page */ + memcpy(refbk, &pfault_init_refbk, bytes_in_last_page); + + expect_pgm_int(); + diag258(refbk); + check_pgm_int_code(PGM_INT_CODE_ADDRESSING); + report_prefix_pop(); +} + +/* + * Verify that a refbk with an invalid refdiagc is not accepted. + */ +static void test_refbk_invalid_diagcode(void) +{ + struct pfault_refbk refbk = pfault_init_refbk; + + report_prefix_push("invalid refdiagc"); + refbk.refdiagc = 0xc0fe; + + expect_pgm_int(); + diag258(&refbk); + check_pgm_int_code(PGM_INT_CODE_SPECIFICATION); + report_prefix_pop(); +} + +int main(void) +{ + report_prefix_push("diag258"); + + expect_pgm_int(); + diag258((struct pfault_refbk *)0xfffffffffffffff0); + if (clear_pgm_int() == PGM_INT_CODE_SPECIFICATION) { + report_skip("diag258 not supported"); + } else { + test_priv(); + /* Other tests rely on invalid diagcodes doing nothing */ + test_refbk_invalid_diagcode(); + test_refbk_real(); + test_refbk_prefixing(); + test_refbk_crossing(); + } + + report_prefix_pop(); + return report_summary(); +} diff --git a/s390x/unittests.cfg b/s390x/unittests.cfg index 3a9decc932f2..8131ba105d3f 100644 --- a/s390x/unittests.cfg +++ b/s390x/unittests.cfg @@ -392,3 +392,6 @@ file = sie-dat.elf [pv-attest] file = pv-attest.elf + +[diag258] +file = diag258.elf