From mboxrd@z Thu Jan 1 00:00:00 1970 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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DF6DFC433F5 for ; Mon, 24 Jan 2022 22:51:33 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4JjQFw2rGYz30jZ for ; Tue, 25 Jan 2022 09:51:32 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=pd5OIH8i; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=linux.ibm.com (client-ip=148.163.158.5; helo=mx0a-001b2d01.pphosted.com; envelope-from=farosas@linux.ibm.com; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=pd5OIH8i; dkim-atps=neutral Received: from mx0a-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 lists.ozlabs.org (Postfix) with ESMTPS id 4JjQF7660Vz3002 for ; Tue, 25 Jan 2022 09:50:51 +1100 (AEDT) Received: from pps.filterd (m0098413.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 20OKWume013652 for ; Mon, 24 Jan 2022 22:50:49 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : in-reply-to : references : date : message-id : mime-version : content-type; s=pp1; bh=FSU3ab3lcZnA6OyPGsD0s5zkLYI3WjHzzavfD8rih6Y=; b=pd5OIH8idzmpZ4Z+ycxMwTEaHBNEDMW08ExALlyfeJulPwLBB7z5PrCEh5CASJZDR2w6 v3SsNe1ohMbM1TQay+l6SPCc/GjQmYlQB3hXdkM1YwQlsRMLa8lOWQ/2DJ7W8te7QZFo 9fUQjRGEQvrDGW+MHEPWoW1OA9gxAg1QeqlPgkDm1wf0WEZZTczRrVPLkj3YK0W1xDpi 7tzXvyIB/WG0miGDu6T3+VTGO1K5JyTjHo4oxJPxpFKt53aDvQlq4zbaJJufNP2BIrXB ij1Elr8cZA2PkPN223anJ9aQ+IZxwl0T5XwpjfYAFDVOXbaev0QhdTJV6ysnUZBgl8gl hA== Received: from pps.reinject (localhost [127.0.0.1]) by mx0b-001b2d01.pphosted.com with ESMTP id 3dt09w6rws-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 24 Jan 2022 22:50:49 +0000 Received: from m0098413.ppops.net (m0098413.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 20OMar1h015453 for ; Mon, 24 Jan 2022 22:50:48 GMT Received: from ppma04dal.us.ibm.com (7a.29.35a9.ip4.static.sl-reverse.com [169.53.41.122]) by mx0b-001b2d01.pphosted.com with ESMTP id 3dt09w6rwp-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 24 Jan 2022 22:50:48 +0000 Received: from pps.filterd (ppma04dal.us.ibm.com [127.0.0.1]) by ppma04dal.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 20OMb8Cp002655; Mon, 24 Jan 2022 22:50:48 GMT Received: from b03cxnp07028.gho.boulder.ibm.com (b03cxnp07028.gho.boulder.ibm.com [9.17.130.15]) by ppma04dal.us.ibm.com with ESMTP id 3dr9j9u5rm-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 24 Jan 2022 22:50:48 +0000 Received: from b03ledav005.gho.boulder.ibm.com (b03ledav005.gho.boulder.ibm.com [9.17.130.236]) by b03cxnp07028.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 20OMok1Y30933446 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 24 Jan 2022 22:50:47 GMT Received: from b03ledav005.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id DDE19BE06A; Mon, 24 Jan 2022 22:50:46 +0000 (GMT) Received: from b03ledav005.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3CAD4BE051; Mon, 24 Jan 2022 22:50:46 +0000 (GMT) Received: from localhost (unknown [9.163.24.67]) by b03ledav005.gho.boulder.ibm.com (Postfix) with ESMTPS; Mon, 24 Jan 2022 22:50:45 +0000 (GMT) From: Fabiano Rosas To: Nicholas Piggin , linuxppc-dev@lists.ozlabs.org Subject: Re: [PATCH 2/2] KVM: PPC: Book3S PR: Disallow AIL != 0 In-Reply-To: <20220124102417.3741427-3-npiggin@gmail.com> References: <20220124102417.3741427-1-npiggin@gmail.com> <20220124102417.3741427-3-npiggin@gmail.com> Date: Mon, 24 Jan 2022 19:50:44 -0300 Message-ID: <874k5seojf.fsf@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain X-TM-AS-GCONF: 00 X-Proofpoint-GUID: KHkA4_PRxIyElPCANR-XTq2uQ553AxdL X-Proofpoint-ORIG-GUID: kX4gMWMCUZhznQVw2AhfpIRDe44pK2hN X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2022-01-24_09,2022-01-24_02,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=991 suspectscore=0 spamscore=0 impostorscore=0 malwarescore=0 lowpriorityscore=0 clxscore=1015 mlxscore=0 phishscore=0 adultscore=0 bulkscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2201240145 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Nicholas Piggin Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Nicholas Piggin writes: > KVM PR does not implement address translation modes on interrupt, so it > must not allow H_SET_MODE to succeed. > > This is not compatible with QEMU behaviour. The solution might be to > have a cap-ail for this, but now it's broken either way so fix it in > KVM to start with. > > This allows PR Linux guests that are using the SCV facility to boot and > run, because Linux disables the use of SCV if AIL can not be set to 3. > This isn't a real fix because Linux or another OS could implement real > mode SCV vectors and try to enable it. The right solution is for KVM to > emulate scv interrupts from the facility unavailable interrupt. > > Signed-off-by: Nicholas Piggin > --- Reviewed-by: Fabiano Rosas > arch/powerpc/kvm/book3s_pr_papr.c | 20 ++++++++++++++++++++ > 1 file changed, 20 insertions(+) > > diff --git a/arch/powerpc/kvm/book3s_pr_papr.c b/arch/powerpc/kvm/book3s_pr_papr.c > index 1f10e7dfcdd0..dc4f51ac84bc 100644 > --- a/arch/powerpc/kvm/book3s_pr_papr.c > +++ b/arch/powerpc/kvm/book3s_pr_papr.c > @@ -281,6 +281,22 @@ static int kvmppc_h_pr_logical_ci_store(struct kvm_vcpu *vcpu) > return EMULATE_DONE; > } > > +static int kvmppc_h_pr_set_mode(struct kvm_vcpu *vcpu) > +{ > + unsigned long mflags = kvmppc_get_gpr(vcpu, 4); > + unsigned long resource = kvmppc_get_gpr(vcpu, 5); > + > + if (resource == H_SET_MODE_RESOURCE_ADDR_TRANS_MODE) { > + /* KVM PR does not provide AIL!=0 to guests */ > + if (mflags == 0) > + kvmppc_set_gpr(vcpu, 3, H_SUCCESS); > + else > + kvmppc_set_gpr(vcpu, 3, H_UNSUPPORTED_FLAG_START - 63); > + return EMULATE_DONE; > + } > + return EMULATE_FAIL; > +} > + > #ifdef CONFIG_SPAPR_TCE_IOMMU > static int kvmppc_h_pr_put_tce(struct kvm_vcpu *vcpu) > { > @@ -384,6 +400,8 @@ int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd) > return kvmppc_h_pr_logical_ci_load(vcpu); > case H_LOGICAL_CI_STORE: > return kvmppc_h_pr_logical_ci_store(vcpu); > + case H_SET_MODE: > + return kvmppc_h_pr_set_mode(vcpu); > case H_XIRR: > case H_CPPR: > case H_EOI: > @@ -421,6 +439,7 @@ int kvmppc_hcall_impl_pr(unsigned long cmd) > case H_CEDE: > case H_LOGICAL_CI_LOAD: > case H_LOGICAL_CI_STORE: > + case H_SET_MODE: > #ifdef CONFIG_KVM_XICS > case H_XIRR: > case H_CPPR: > @@ -447,6 +466,7 @@ static unsigned int default_hcall_list[] = { > H_BULK_REMOVE, > H_PUT_TCE, > H_CEDE, > + H_SET_MODE, > #ifdef CONFIG_KVM_XICS > H_XIRR, > H_CPPR,