From patchwork Mon Feb 5 13:26:07 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Amit Machhiwal X-Patchwork-Id: 196830 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a05:7301:168b:b0:106:860b:bbdd with SMTP id ma11csp871923dyb; Mon, 5 Feb 2024 05:27:28 -0800 (PST) X-Google-Smtp-Source: AGHT+IH7bGyxdlgox5ijglB2hJPnc6OZMnayRE9ZqMwyEznlm+Tp89xSbF6JyfdM/GhqRdGk46zW X-Received: by 2002:a05:6808:3c8a:b0:3bd:d7f6:21b1 with SMTP id gs10-20020a0568083c8a00b003bdd7f621b1mr26101399oib.9.1707139647891; Mon, 05 Feb 2024 05:27:27 -0800 (PST) ARC-Seal: i=2; a=rsa-sha256; t=1707139647; cv=pass; d=google.com; s=arc-20160816; b=u+nGC54m/toMG7SDRZ1FZcJylgSxqRv+jC+3UOd0VPbmYm8Rd/JI7wzLqYCkhArk6I zxELKUWX/TywvZFE6N64uaBOmAljnZjdP3qG+s94jajiwwiKS9CCLaR1HUdjG69zNTfC p+b8kAqaf9IT838w80Y2SWWOekTz+11CbdeD822HW3Cfufy0cfs+Ibpn9cqiac/fx7p0 P6NZH8qMkeFccehA/xY82x0vc6l1D4il7v6XM4ggpX1McCNpZyzXVyGfmr8271OXJ3MM /x9wY/16gvZug6vcBhcXGLE31jfLutodTzvzAwaEX2k5EWVgP7mfai3X+p0LuDFGWKpt Qo4Q== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:list-unsubscribe:list-subscribe:list-id:precedence :content-transfer-encoding:message-id:date:subject:cc:to:from :dkim-signature; bh=mdHnH3qetbE94X7CB4elv56+yDxmbNIgxKJqE8r61Og=; fh=dCeTQ7xPkXcscllOKkOX2/dPP62ZffKNc9SF0QptBgI=; b=KgltVnxGHA8wOroKmtIhtJKRUQ+2W22A+QrT8JYZm2loYmgK7K9Tut2lpPc5EP29LP 5GCMZ3e7dJopGnjQewA46XBQ2mYs67kmvy5aPLJNzU+bmXMU+GXEELTic/orhpUmzst3 B+6+g44xdnqOt43cT7wKBCb3Zpw7L6vaFoZ4wzr9q5Vg3E/gyqQLCayh1qj1PsqVkQfI I5D+p/F9sW+aFGaG+8IkEUQOH7kgjZe1qO+KDAEPka6/89paKl8sY9UIlNOp+O5gxOLS U0khggeONiWJGFHtQYEIx7MsLi/eXewSB3nPeOAtk9JN7hdIIse60rQqBfouPxj0P3L6 YMGg==; dara=google.com ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@ibm.com header.s=pp1 header.b=JcAAbqKI; arc=pass (i=1 spf=pass spfdomain=linux.ibm.com dkim=pass dkdomain=ibm.com dmarc=pass fromdomain=linux.ibm.com); spf=pass (google.com: domain of linux-kernel+bounces-52713-ouuuleilei=gmail.com@vger.kernel.org designates 2604:1380:45d1:ec00::1 as permitted sender) smtp.mailfrom="linux-kernel+bounces-52713-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=REJECT sp=NONE dis=NONE) header.from=ibm.com X-Forwarded-Encrypted: i=1; AJvYcCUiIQmOZocLmqQX8mualVRflLKu2fp0G/iBr2pYA8ijBZNpKRyT3uiZEfnbtyb+pQ9NcNrPEkLrL7M2E7TpBi1EpMY8NA== Received: from ny.mirrors.kernel.org (ny.mirrors.kernel.org. [2604:1380:45d1:ec00::1]) by mx.google.com with ESMTPS id a18-20020a05620a103200b00784aae26822si8447822qkk.583.2024.02.05.05.27.27 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 05 Feb 2024 05:27:27 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel+bounces-52713-ouuuleilei=gmail.com@vger.kernel.org designates 2604:1380:45d1:ec00::1 as permitted sender) client-ip=2604:1380:45d1:ec00::1; Authentication-Results: mx.google.com; dkim=pass header.i=@ibm.com header.s=pp1 header.b=JcAAbqKI; arc=pass (i=1 spf=pass spfdomain=linux.ibm.com dkim=pass dkdomain=ibm.com dmarc=pass fromdomain=linux.ibm.com); spf=pass (google.com: domain of linux-kernel+bounces-52713-ouuuleilei=gmail.com@vger.kernel.org designates 2604:1380:45d1:ec00::1 as permitted sender) smtp.mailfrom="linux-kernel+bounces-52713-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=REJECT sp=NONE dis=NONE) header.from=ibm.com Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ny.mirrors.kernel.org (Postfix) with ESMTPS id 9B16B1C22329 for ; Mon, 5 Feb 2024 13:27:27 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 0F0C12421C; Mon, 5 Feb 2024 13:26:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="JcAAbqKI" 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 79C3A21363; Mon, 5 Feb 2024 13:26:53 +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=1707139615; cv=none; b=DdGV3atGJNU4clHNlpW3b55w0Uozg8nOGaBR7qOdIEIyjJYX/32gRB1AM8viCD7RmLWYmwErO4W0t0eRd4P2s7rAE/05TgBUuIfVNB0W99GTaaMasc6aRLXtr2G7IfFGPCMdaPz9Wk8ns0Bk+8x2nja1GNUsEZce1Xk8hoXL1CE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707139615; c=relaxed/simple; bh=bc55ah4GGX+cv9v4XJjjrr3zhAmRW2kCv6zh6qIUK3A=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=oP6EXsYlqBH5cJweSOheJZPIiQJiBK+VHK1vDdE3zx47MCoX/gcaghpnIQ9tVkKTcBY3rwYKSHd13xwiCNZoKH5M67mX/Qfusxq6fBxsonCHPt1KuCzH7Pw6dTKaWa9Igdy1wLj+PdyXQ2hFiNhD6PiXe6TGar2ELKzxjveEmfw= 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=JcAAbqKI; 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 Received: from pps.filterd (m0353723.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 415DBKnk019393; Mon, 5 Feb 2024 13:26:41 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : content-transfer-encoding : mime-version; s=pp1; bh=mdHnH3qetbE94X7CB4elv56+yDxmbNIgxKJqE8r61Og=; b=JcAAbqKISfYXuQ7vUxFRaHVkJksJfs/iWRXSghLcH88IRI2xQD7VXDpJNqe6upJJWLCU ctWK7Drkxi0kIzlcB5wnIyYhHF3jjlG1mFBapi920QLOfh8mx09R3YTeedLzJVGefC5N QGf4AHxavoK2NpYX7bw0hVjMYE3FdrqP7Z9qDNqzxhpOt+aNRwWUTJO0Gs9FEfKB4aOH I51wdKwrZhBd0ibFLtxa7zi3ohqhUy6VyQR8jN4eeoOvo3L3JoPJmGPVi2zfwEEcMtgj 1ugYoSBRL6bHtfm6qieM2Q2LhGo/2pxKdy4npmIVTXvpe+rPajBI6+USXq6HyD87ootn fA== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3w30b88c8u-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 05 Feb 2024 13:26:40 +0000 Received: from m0353723.ppops.net (m0353723.ppops.net [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 415DC8q8021755; Mon, 5 Feb 2024 13:26:39 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 3w30b88c8f-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 05 Feb 2024 13:26:39 +0000 Received: from pps.filterd (ppma12.dal12v.mail.ibm.com [127.0.0.1]) by ppma12.dal12v.mail.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 415D71ZW020234; Mon, 5 Feb 2024 13:26:38 GMT Received: from smtprelay03.fra02v.mail.ibm.com ([9.218.2.224]) by ppma12.dal12v.mail.ibm.com (PPS) with ESMTPS id 3w1ytsrws1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 05 Feb 2024 13:26:38 +0000 Received: from smtpav01.fra02v.mail.ibm.com (smtpav01.fra02v.mail.ibm.com [10.20.54.100]) by smtprelay03.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 415DQZjW16057040 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 5 Feb 2024 13:26:35 GMT Received: from smtpav01.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8E3FF2004B; Mon, 5 Feb 2024 13:26:35 +0000 (GMT) Received: from smtpav01.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6BE3220043; Mon, 5 Feb 2024 13:26:32 +0000 (GMT) Received: from li-a83676cc-350e-11b2-a85c-e11f86bb8d73.ibm.com.com (unknown [9.43.119.185]) by smtpav01.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 5 Feb 2024 13:26:32 +0000 (GMT) From: Amit Machhiwal To: linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, kvm-ppc@vger.kernel.org Cc: Vaibhav Jain , Nicholas Piggin , Michael Ellerman , Jordan Niethe , Vaidyanathan Srinivasan , "Aneesh Kumar K . V" , "Naveen N . Rao" , Christophe Leroy , Amit Machhiwal , linux-kernel@vger.kernel.org Subject: [PATCH v2] KVM: PPC: Book3S HV: Fix L2 guest reboot failure due to empty 'arch_compat' Date: Mon, 5 Feb 2024 18:56:07 +0530 Message-ID: <20240205132607.2776637-1-amachhiw@linux.ibm.com> X-Mailer: git-send-email 2.43.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: _bqdb9hlZOc-8EMgVZbiUklYjAIer3PQ X-Proofpoint-ORIG-GUID: 3wWOD7aAiCD7PQ0uFC7-sU7WZquFkmOZ X-Proofpoint-UnRewURL: 0 URL was un-rewritten Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-02-05_08,2024-01-31_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 clxscore=1011 mlxlogscore=839 spamscore=0 malwarescore=0 mlxscore=0 lowpriorityscore=0 phishscore=0 adultscore=0 impostorscore=0 priorityscore=1501 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2402050101 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1790065663359609702 X-GMAIL-MSGID: 1790065663359609702 Currently, rebooting a pseries nested qemu-kvm guest (L2) results in below error as L1 qemu sends PVR value 'arch_compat' == 0 via ppc_set_compat ioctl. This triggers a condition failure in kvmppc_set_arch_compat() resulting in an EINVAL. qemu-system-ppc64: Unable to set CPU compatibility mode in KVM: Invalid argument Also, a value of 0 for arch_compat generally refers the default compatibility of the host. But, arch_compat, being a Guest Wide Element in nested API v2, cannot be set to 0 in GSB as PowerVM (L0) expects a non-zero value. A value of 0 triggers a kernel trap during a reboot and consequently causes it to fail: [ 22.106360] reboot: Restarting system KVM: unknown exit, hardware reason ffffffffffffffea NIP 0000000000000100 LR 000000000000fe44 CTR 0000000000000000 XER 0000000020040092 CPU#0 MSR 0000000000001000 HID0 0000000000000000 HF 6c000000 iidx 3 didx 3 TB 00000000 00000000 DECR 0 GPR00 0000000000000000 0000000000000000 c000000002a8c300 000000007fe00000 GPR04 0000000000000000 0000000000000000 0000000000001002 8000000002803033 GPR08 000000000a000000 0000000000000000 0000000000000004 000000002fff0000 GPR12 0000000000000000 c000000002e10000 0000000105639200 0000000000000004 GPR16 0000000000000000 000000010563a090 0000000000000000 0000000000000000 GPR20 0000000105639e20 00000001056399c8 00007fffe54abab0 0000000105639288 GPR24 0000000000000000 0000000000000001 0000000000000001 0000000000000000 GPR28 0000000000000000 0000000000000000 c000000002b30840 0000000000000000 CR 00000000 [ - - - - - - - - ] RES 000@ffffffffffffffff SRR0 0000000000000000 SRR1 0000000000000000 PVR 0000000000800200 VRSAVE 0000000000000000 SPRG0 0000000000000000 SPRG1 0000000000000000 SPRG2 0000000000000000 SPRG3 0000000000000000 SPRG4 0000000000000000 SPRG5 0000000000000000 SPRG6 0000000000000000 SPRG7 0000000000000000 HSRR0 0000000000000000 HSRR1 0000000000000000 CFAR 0000000000000000 LPCR 0000000000020400 PTCR 0000000000000000 DAR 0000000000000000 DSISR 0000000000000000 kernel:trap=0xffffffea | pc=0x100 | msr=0x1000 This patch updates kvmppc_set_arch_compat() to use the host PVR value if 'compat_pvr' == 0 indicating that qemu doesn't want to enforce any specific PVR compat mode. Fixes: 19d31c5f1157 ("KVM: PPC: Add support for nestedv2 guests") Signed-off-by: Amit Machhiwal Reviewed-by: Aneesh Kumar K.V (IBM) Reviewed-by: Vaibhav Jain --- Changes v1 -> v2: - Added descriptive error log in the patch description when `arch_compat == 0` passed in GSB - Added a helper function for PCR to capabilities mapping - Added relevant comments around the changes being made v1: https://lore.kernel.org/lkml/20240118095653.2588129-1-amachhiw@linux.ibm.com/ arch/powerpc/kvm/book3s_hv.c | 25 +++++++++++++++++++++++-- arch/powerpc/kvm/book3s_hv_nestedv2.c | 23 +++++++++++++++++++++-- 2 files changed, 44 insertions(+), 4 deletions(-) base-commit: 6764c317b6bb91bd806ef79adf6d9c0e428b191e diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 52427fc2a33f..270ab9cf9a54 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -391,6 +391,23 @@ static void kvmppc_set_pvr_hv(struct kvm_vcpu *vcpu, u32 pvr) /* Dummy value used in computing PCR value below */ #define PCR_ARCH_31 (PCR_ARCH_300 << 1) +static inline unsigned long map_pcr_to_cap(unsigned long pcr) +{ + unsigned long cap = 0; + + switch (pcr) { + case PCR_ARCH_300: + cap = H_GUEST_CAP_POWER9; + break; + case PCR_ARCH_31: + cap = H_GUEST_CAP_POWER10; + default: + break; + } + + return cap; +} + static int kvmppc_set_arch_compat(struct kvm_vcpu *vcpu, u32 arch_compat) { unsigned long host_pcr_bit = 0, guest_pcr_bit = 0, cap = 0; @@ -424,11 +441,9 @@ static int kvmppc_set_arch_compat(struct kvm_vcpu *vcpu, u32 arch_compat) break; case PVR_ARCH_300: guest_pcr_bit = PCR_ARCH_300; - cap = H_GUEST_CAP_POWER9; break; case PVR_ARCH_31: guest_pcr_bit = PCR_ARCH_31; - cap = H_GUEST_CAP_POWER10; break; default: return -EINVAL; @@ -440,6 +455,12 @@ static int kvmppc_set_arch_compat(struct kvm_vcpu *vcpu, u32 arch_compat) return -EINVAL; if (kvmhv_on_pseries() && kvmhv_is_nestedv2()) { + /* + * 'arch_compat == 0' would mean the guest should default to + * L1's compatibility. In this case, the guest would pick + * host's PCR and evaluate the corresponding capabilities. + */ + cap = map_pcr_to_cap(guest_pcr_bit); if (!(cap & nested_capabilities)) return -EINVAL; } diff --git a/arch/powerpc/kvm/book3s_hv_nestedv2.c b/arch/powerpc/kvm/book3s_hv_nestedv2.c index 5378eb40b162..6042bdc70230 100644 --- a/arch/powerpc/kvm/book3s_hv_nestedv2.c +++ b/arch/powerpc/kvm/book3s_hv_nestedv2.c @@ -138,6 +138,7 @@ static int gs_msg_ops_vcpu_fill_info(struct kvmppc_gs_buff *gsb, vector128 v; int rc, i; u16 iden; + u32 arch_compat = 0; vcpu = gsm->data; @@ -347,8 +348,26 @@ static int gs_msg_ops_vcpu_fill_info(struct kvmppc_gs_buff *gsb, break; } case KVMPPC_GSID_LOGICAL_PVR: - rc = kvmppc_gse_put_u32(gsb, iden, - vcpu->arch.vcore->arch_compat); + /* + * Though 'arch_compat == 0' would mean the default + * compatibility, arch_compat, being a Guest Wide + * Element, cannot be filled with a value of 0 in GSB + * as this would result into a kernel trap. + * Hence, when `arch_compat == 0`, arch_compat should + * default to L1's PVR. + * + * Rework this when PowerVM supports a value of 0 + * for arch_compat for KVM API v2. + */ + if (!vcpu->arch.vcore->arch_compat) { + if (cpu_has_feature(CPU_FTR_ARCH_31)) + arch_compat = PVR_ARCH_31; + else if (cpu_has_feature(CPU_FTR_ARCH_300)) + arch_compat = PVR_ARCH_300; + } else { + arch_compat = vcpu->arch.vcore->arch_compat; + } + rc = kvmppc_gse_put_u32(gsb, iden, arch_compat); break; }