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 X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4F90DC04AB5 for ; Thu, 6 Jun 2019 05:27:32 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1797C20717 for ; Thu, 6 Jun 2019 05:27:31 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1797C20717 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.vnet.ibm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([127.0.0.1]:54830 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hYkvy-0004cu-WB for qemu-devel@archiver.kernel.org; Thu, 06 Jun 2019 01:27:31 -0400 Received: from eggs.gnu.org ([209.51.188.92]:48320) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hYkv9-0004IX-I7 for qemu-devel@nongnu.org; Thu, 06 Jun 2019 01:26:40 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hYkv7-0002IX-MU for qemu-devel@nongnu.org; Thu, 06 Jun 2019 01:26:39 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:59334 helo=mx0a-001b2d01.pphosted.com) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hYkv7-0002Fa-GD for qemu-devel@nongnu.org; Thu, 06 Jun 2019 01:26:37 -0400 Received: from pps.filterd (m0098414.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x565LnL0115187 for ; Thu, 6 Jun 2019 01:26:35 -0400 Received: from e16.ny.us.ibm.com (e16.ny.us.ibm.com [129.33.205.206]) by mx0b-001b2d01.pphosted.com with ESMTP id 2sxtt84f69-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 06 Jun 2019 01:26:35 -0400 Received: from localhost by e16.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Thu, 6 Jun 2019 06:26:31 +0100 Received: from b01ledav002.gho.pok.ibm.com (b01ledav002.gho.pok.ibm.com [9.57.199.107]) by b01cxnp23034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x565QUNf29032854 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 6 Jun 2019 05:26:30 GMT Received: from b01ledav002.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 28315124054; Thu, 6 Jun 2019 05:26:30 +0000 (GMT) Received: from b01ledav002.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A589512405B; Thu, 6 Jun 2019 05:26:27 +0000 (GMT) Received: from [9.85.82.46] (unknown [9.85.82.46]) by b01ledav002.gho.pok.ibm.com (Postfix) with ESMTP; Thu, 6 Jun 2019 05:26:27 +0000 (GMT) To: David Gibson References: <155910829070.13149.5215948335633966328.stgit@aravinda> <155910841478.13149.2830700794862210739.stgit@aravinda> <20190606013457.GD10319@umbus.fritz.box> From: Aravinda Prasad Date: Thu, 6 Jun 2019 10:56:26 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <20190606013457.GD10319@umbus.fritz.box> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 19060605-0072-0000-0000-000004382E78 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00011222; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000286; SDB=6.01213906; UDB=6.00638058; IPR=6.00994985; MB=3.00027202; MTD=3.00000008; XFM=3.00000015; UTC=2019-06-06 05:26:32 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19060605-0073-0000-0000-00004C84B439 Message-Id: X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-06-06_05:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1906060039 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] X-Received-From: 148.163.158.5 Subject: Re: [Qemu-devel] [Qemu-ppc] [PATCH v9 1/6] ppc: spapr: Handle "ibm, nmi-register" and "ibm, nmi-interlock" RTAS calls X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: aik@au1.ibm.com, qemu-devel@nongnu.org, groug@kaod.org, paulus@ozlabs.org, qemu-ppc@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Thursday 06 June 2019 07:04 AM, David Gibson wrote: > On Wed, May 29, 2019 at 11:10:14AM +0530, Aravinda Prasad wrote: >> This patch adds support in QEMU to handle "ibm,nmi-register" >> and "ibm,nmi-interlock" RTAS calls. >> >> The machine check notification address is saved when the >> OS issues "ibm,nmi-register" RTAS call. >> >> This patch also handles the case when multiple processors >> experience machine check at or about the same time by >> handling "ibm,nmi-interlock" call. In such cases, as per >> PAPR, subsequent processors serialize waiting for the first >> processor to issue the "ibm,nmi-interlock" call. The second >> processor that also received a machine check error waits >> till the first processor is done reading the error log. >> The first processor issues "ibm,nmi-interlock" call >> when the error log is consumed. This patch implements the >> releasing part of the error-log while subsequent patch >> (which builds error log) handles the locking part. >> >> Signed-off-by: Aravinda Prasad >> Reviewed-by: David Gibson >> --- >> hw/ppc/spapr.c | 7 +++++ >> hw/ppc/spapr_rtas.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++++ >> include/hw/ppc/spapr.h | 9 ++++++- >> 3 files changed, 80 insertions(+), 1 deletion(-) >> >> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c >> index e2b33e5..fae28a9 100644 >> --- a/hw/ppc/spapr.c >> +++ b/hw/ppc/spapr.c >> @@ -1808,6 +1808,11 @@ static void spapr_machine_reset(void) >> first_ppc_cpu->env.gpr[5] = 0; >> >> spapr->cas_reboot = false; >> + >> + spapr->guest_machine_check_addr = -1; >> + >> + /* Signal all vCPUs waiting on this condition */ >> + qemu_cond_broadcast(&spapr->mc_delivery_cond); >> } >> >> static void spapr_create_nvram(SpaprMachineState *spapr) >> @@ -3072,6 +3077,8 @@ static void spapr_machine_init(MachineState *machine) >> >> kvmppc_spapr_enable_inkernel_multitce(); >> } >> + >> + qemu_cond_init(&spapr->mc_delivery_cond); >> } >> >> static int spapr_kvm_type(MachineState *machine, const char *vm_type) >> diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c >> index 5bc1a93..e7509cf 100644 >> --- a/hw/ppc/spapr_rtas.c >> +++ b/hw/ppc/spapr_rtas.c >> @@ -352,6 +352,38 @@ static void rtas_get_power_level(PowerPCCPU *cpu, SpaprMachineState *spapr, >> rtas_st(rets, 1, 100); >> } >> >> +static void rtas_ibm_nmi_register(PowerPCCPU *cpu, >> + SpaprMachineState *spapr, >> + uint32_t token, uint32_t nargs, >> + target_ulong args, >> + uint32_t nret, target_ulong rets) >> +{ >> + hwaddr rtas_addr = spapr_get_rtas_addr(); >> + >> + if (!rtas_addr) { >> + rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED); >> + return; >> + } >> + >> + spapr->guest_machine_check_addr = rtas_ld(args, 1); >> + rtas_st(rets, 0, RTAS_OUT_SUCCESS); >> +} >> + >> +static void rtas_ibm_nmi_interlock(PowerPCCPU *cpu, >> + SpaprMachineState *spapr, >> + uint32_t token, uint32_t nargs, >> + target_ulong args, >> + uint32_t nret, target_ulong rets) >> +{ >> + if (spapr->guest_machine_check_addr == -1) { >> + /* NMI register not called */ >> + rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); >> + } else { >> + qemu_cond_signal(&spapr->mc_delivery_cond); >> + rtas_st(rets, 0, RTAS_OUT_SUCCESS); >> + } >> +} >> + >> static struct rtas_call { >> const char *name; >> spapr_rtas_fn fn; >> @@ -470,6 +502,35 @@ void spapr_load_rtas(SpaprMachineState *spapr, void *fdt, hwaddr addr) >> } >> } >> >> +hwaddr spapr_get_rtas_addr(void) >> +{ >> + SpaprMachineState *spapr = SPAPR_MACHINE(qdev_get_machine()); >> + int rtas_node; >> + const struct fdt_property *rtas_addr_prop; >> + void *fdt = spapr->fdt_blob; >> + uint32_t rtas_addr; >> + >> + /* fetch rtas addr from fdt */ >> + rtas_node = fdt_path_offset(fdt, "/rtas"); >> + if (rtas_node == 0) { >> + return 0; > > This is incorrect, a return code < 0 indicates an error which you > should check for. A return code of 0 indicates the root node, which > could only happen if libfdt was badly buggy. ok > >> + } >> + >> + rtas_addr_prop = fdt_get_property(fdt, rtas_node, "linux,rtas-base", NULL); > > fdt_get_property is generally only needed for certain edge cases. > fdt_getprop() is a better option. ok > >> + if (!rtas_addr_prop) { >> + return 0; >> + } >> + >> + /* >> + * We assume that the OS called RTAS instantiate-rtas, but some other >> + * OS might call RTAS instantiate-rtas-64 instead. This fine as of now >> + * as SLOF only supports 32-bit variant. >> + */ >> + rtas_addr = fdt32_to_cpu(*(uint32_t *)rtas_addr_prop->data); >> + return (hwaddr)rtas_addr; >> +} >> + >> + >> static void core_rtas_register_types(void) >> { >> spapr_rtas_register(RTAS_DISPLAY_CHARACTER, "display-character", >> @@ -493,6 +554,10 @@ static void core_rtas_register_types(void) >> rtas_set_power_level); >> spapr_rtas_register(RTAS_GET_POWER_LEVEL, "get-power-level", >> rtas_get_power_level); >> + spapr_rtas_register(RTAS_IBM_NMI_REGISTER, "ibm,nmi-register", >> + rtas_ibm_nmi_register); >> + spapr_rtas_register(RTAS_IBM_NMI_INTERLOCK, "ibm,nmi-interlock", >> + rtas_ibm_nmi_interlock); >> } >> >> type_init(core_rtas_register_types) >> diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h >> index 4f5becf..9dc5e30 100644 >> --- a/include/hw/ppc/spapr.h >> +++ b/include/hw/ppc/spapr.h >> @@ -188,6 +188,10 @@ struct SpaprMachineState { >> * occurs during the unplug process. */ >> QTAILQ_HEAD(, SpaprDimmState) pending_dimm_unplugs; >> >> + /* State related to "ibm,nmi-register" and "ibm,nmi-interlock" calls */ >> + target_ulong guest_machine_check_addr; >> + QemuCond mc_delivery_cond; >> + >> /*< public >*/ >> char *kvm_type; >> char *host_model; >> @@ -624,8 +628,10 @@ target_ulong spapr_hypercall(PowerPCCPU *cpu, target_ulong opcode, >> #define RTAS_IBM_CREATE_PE_DMA_WINDOW (RTAS_TOKEN_BASE + 0x27) >> #define RTAS_IBM_REMOVE_PE_DMA_WINDOW (RTAS_TOKEN_BASE + 0x28) >> #define RTAS_IBM_RESET_PE_DMA_WINDOW (RTAS_TOKEN_BASE + 0x29) >> +#define RTAS_IBM_NMI_REGISTER (RTAS_TOKEN_BASE + 0x2A) >> +#define RTAS_IBM_NMI_INTERLOCK (RTAS_TOKEN_BASE + 0x2B) >> >> -#define RTAS_TOKEN_MAX (RTAS_TOKEN_BASE + 0x2A) >> +#define RTAS_TOKEN_MAX (RTAS_TOKEN_BASE + 0x2C) >> >> /* RTAS ibm,get-system-parameter token values */ >> #define RTAS_SYSPARM_SPLPAR_CHARACTERISTICS 20 >> @@ -876,4 +882,5 @@ void spapr_check_pagesize(SpaprMachineState *spapr, hwaddr pagesize, >> #define SPAPR_OV5_XIVE_BOTH 0x80 /* Only to advertise on the platform */ >> >> void spapr_set_all_lpcrs(target_ulong value, target_ulong mask); >> +uint64_t spapr_get_rtas_addr(void); >> #endif /* HW_SPAPR_H */ >> > -- Regards, Aravinda