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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT 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 10197C2D0DD for ; Thu, 2 Jan 2020 07:57:50 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D989020866 for ; Thu, 2 Jan 2020 07:57:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D989020866 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.ibm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:38048 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1imvMb-0001rC-1s for qemu-devel@archiver.kernel.org; Thu, 02 Jan 2020 02:57:49 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:36890) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1imvGy-0002vz-M1 for qemu-devel@nongnu.org; Thu, 02 Jan 2020 02:52:02 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1imvGx-0005Mn-2k for qemu-devel@nongnu.org; Thu, 02 Jan 2020 02:52:00 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:6896) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1imvGw-0005Mc-Rc for qemu-devel@nongnu.org; Thu, 02 Jan 2020 02:51:59 -0500 Received: from pps.filterd (m0098399.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 0027mF2W105324 for ; Thu, 2 Jan 2020 02:51:58 -0500 Received: from e06smtp05.uk.ibm.com (e06smtp05.uk.ibm.com [195.75.94.101]) by mx0a-001b2d01.pphosted.com with ESMTP id 2x88jvp36w-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 02 Jan 2020 02:51:57 -0500 Received: from localhost by e06smtp05.uk.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, 2 Jan 2020 07:51:52 -0000 Received: from d06av21.portsmouth.uk.ibm.com (d06av21.portsmouth.uk.ibm.com [9.149.105.232]) by b06cxnps4076.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 0027pqwX50462894 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 2 Jan 2020 07:51:52 GMT Received: from d06av21.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id DE73E52067; Thu, 2 Jan 2020 07:51:51 +0000 (GMT) Received: from localhost.localdomain.com (unknown [9.199.45.4]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTP id C55185204E; Thu, 2 Jan 2020 07:51:49 +0000 (GMT) From: Ganesh Goudar To: aik@ozlabs.ru, qemu-ppc@nongnu.org, qemu-devel@nongnu.org, david@gibson.dropbear.id.au Subject: [PATCH v18 3/7] target/ppc: Handle NMI guest exit Date: Thu, 2 Jan 2020 13:21:07 +0530 X-Mailer: git-send-email 2.17.2 In-Reply-To: <20200102075111.25308-1-ganeshgr@linux.ibm.com> References: <20200102075111.25308-1-ganeshgr@linux.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 20010207-0020-0000-0000-0000039D2C0D X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20010207-0021-0000-0000-000021F47984 Message-Id: <20200102075111.25308-4-ganeshgr@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.95,18.0.572 definitions=2020-01-02_01:2019-12-30,2020-01-02 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 mlxscore=0 impostorscore=0 clxscore=1015 bulkscore=0 adultscore=0 spamscore=0 malwarescore=0 priorityscore=1501 suspectscore=0 phishscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1910280000 definitions=main-2001020072 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 148.163.156.1 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: paulus@ozlabs.org, Aravinda Prasad , groug@kaod.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Aravinda Prasad Memory error such as bit flips that cannot be corrected by hardware are passed on to the kernel for handling. If the memory address in error belongs to guest then the guest kernel is responsible for taking suitable action. Patch [1] enhances KVM to exit guest with exit reason set to KVM_EXIT_NMI in such cases. This patch handles KVM_EXIT_NMI exit. [1] https://www.spinics.net/lists/kvm-ppc/msg12637.html (e20bbd3d and related commits) Signed-off-by: Aravinda Prasad Reviewed-by: David Gibson Reviewed-by: Greg Kurz --- hw/ppc/spapr.c | 8 ++++++++ hw/ppc/spapr_events.c | 37 +++++++++++++++++++++++++++++++++++++ include/hw/ppc/spapr.h | 10 ++++++++++ target/ppc/kvm.c | 14 ++++++++++++++ target/ppc/kvm_ppc.h | 2 ++ target/ppc/trace-events | 1 + 6 files changed, 72 insertions(+) diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index c91e64aad0..975d7da734 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -1679,6 +1679,12 @@ static void spapr_machine_reset(MachineState *machine) first_ppc_cpu->env.gpr[5] = 0; spapr->cas_reboot = false; + + spapr->mc_status = -1; + 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) @@ -2973,6 +2979,8 @@ 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_events.c b/hw/ppc/spapr_events.c index e355e000d0..dfc0de840a 100644 --- a/hw/ppc/spapr_events.c +++ b/hw/ppc/spapr_events.c @@ -40,6 +40,7 @@ #include "hw/ppc/spapr_drc.h" #include "qemu/help_option.h" #include "qemu/bcd.h" +#include "qemu/main-loop.h" #include "hw/ppc/spapr_ovec.h" #include @@ -622,6 +623,42 @@ void spapr_hotplug_req_remove_by_count_indexed(SpaprDrcType drc_type, RTAS_LOG_V6_HP_ACTION_REMOVE, drc_type, &drc_id); } +void spapr_mce_req_event(PowerPCCPU *cpu) +{ + SpaprMachineState *spapr = SPAPR_MACHINE(qdev_get_machine()); + CPUState *cs = CPU(cpu); + + if (spapr->guest_machine_check_addr == -1) { + /* + * This implies that we have hit a machine check either when the + * guest has not registered FWNMI (i.e., "ibm,nmi-register" not + * called) or between system reset and "ibm,nmi-register". + * Fall back to the old machine check behavior in such cases. + */ + cs->exception_index = POWERPC_EXCP_MCHECK; + ppc_cpu_do_interrupt(cs); + return; + } + + while (spapr->mc_status != -1) { + /* + * Check whether the same CPU got machine check error + * while still handling the mc error (i.e., before + * that CPU called "ibm,nmi-interlock") + */ + if (spapr->mc_status == cpu->vcpu_id) { + qemu_system_guest_panicked(NULL); + return; + } + qemu_cond_wait_iothread(&spapr->mc_delivery_cond); + /* Meanwhile if the system is reset, then just return */ + if (spapr->guest_machine_check_addr == -1) { + return; + } + } + spapr->mc_status = cpu->vcpu_id; +} + static void check_exception(PowerPCCPU *cpu, SpaprMachineState *spapr, uint32_t token, uint32_t nargs, target_ulong args, diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h index 7bc5fc3a9e..909d3976f9 100644 --- a/include/hw/ppc/spapr.h +++ b/include/hw/ppc/spapr.h @@ -191,6 +191,15 @@ 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; + /* + * mc_status is set to -1 if mc is not in progress, else is set to the CPU + * handling the mc. + */ + int mc_status; + QemuCond mc_delivery_cond; + /*< public >*/ char *kvm_type; char *host_model; @@ -804,6 +813,7 @@ void spapr_clear_pending_events(SpaprMachineState *spapr); int spapr_max_server_number(SpaprMachineState *spapr); void spapr_store_hpte(PowerPCCPU *cpu, hwaddr ptex, uint64_t pte0, uint64_t pte1); +void spapr_mce_req_event(PowerPCCPU *cpu); /* DRC callbacks. */ void spapr_core_release(DeviceState *dev); diff --git a/target/ppc/kvm.c b/target/ppc/kvm.c index 518de7e4b7..2aebb44e2f 100644 --- a/target/ppc/kvm.c +++ b/target/ppc/kvm.c @@ -1708,6 +1708,11 @@ int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run) ret = 0; break; + case KVM_EXIT_NMI: + trace_kvm_handle_nmi_exception(); + ret = kvm_handle_nmi(cpu, run); + break; + default: fprintf(stderr, "KVM: unknown exit reason %d\n", run->exit_reason); ret = -1; @@ -2803,6 +2808,15 @@ int kvm_arch_msi_data_to_gsi(uint32_t data) return data & 0xffff; } +int kvm_handle_nmi(PowerPCCPU *cpu, struct kvm_run *run) +{ + cpu_synchronize_state(CPU(cpu)); + + spapr_mce_req_event(cpu); + + return 0; +} + int kvmppc_enable_hwrng(void) { if (!kvm_enabled() || !kvm_check_extension(kvm_state, KVM_CAP_PPC_HWRNG)) { diff --git a/target/ppc/kvm_ppc.h b/target/ppc/kvm_ppc.h index eedb15d48e..bd2a0edf43 100644 --- a/target/ppc/kvm_ppc.h +++ b/target/ppc/kvm_ppc.h @@ -83,6 +83,8 @@ void kvm_check_mmu(PowerPCCPU *cpu, Error **errp); void kvmppc_set_reg_ppc_online(PowerPCCPU *cpu, unsigned int online); void kvmppc_set_reg_tb_offset(PowerPCCPU *cpu, int64_t tb_offset); +int kvm_handle_nmi(PowerPCCPU *cpu, struct kvm_run *run); + #else static inline uint32_t kvmppc_get_tbfreq(void) diff --git a/target/ppc/trace-events b/target/ppc/trace-events index 3dc6740706..6d15aa90b4 100644 --- a/target/ppc/trace-events +++ b/target/ppc/trace-events @@ -28,3 +28,4 @@ kvm_handle_papr_hcall(void) "handle PAPR hypercall" kvm_handle_epr(void) "handle epr" kvm_handle_watchdog_expiry(void) "handle watchdog expiry" kvm_handle_debug_exception(void) "handle debug exception" +kvm_handle_nmi_exception(void) "handle NMI exception" -- 2.17.2