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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Tue, 12 Mar 2019 10:03:05 -0000 Received: from b01ledav006.gho.pok.ibm.com (b01ledav006.gho.pok.ibm.com [9.57.199.111]) by b01cxnp22036.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x2CA34HD23199902 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 12 Mar 2019 10:03:04 GMT Received: from b01ledav006.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 28DE1AC060; Tue, 12 Mar 2019 10:03:04 +0000 (GMT) Received: from b01ledav006.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id CA20FAC05E; Tue, 12 Mar 2019 10:03:01 +0000 (GMT) Received: from [127.0.1.1] (unknown [9.199.36.55]) by b01ledav006.gho.pok.ibm.com (Postfix) with ESMTP; Tue, 12 Mar 2019 10:03:01 +0000 (GMT) From: Aravinda Prasad To: aik@au1.ibm.com, qemu-ppc@nongnu.org, qemu-devel@nongnu.org, david@gibson.dropbear.id.au Date: Tue, 12 Mar 2019 15:33:00 +0530 In-Reply-To: <155238487986.23844.8099659458599168067.stgit@aravinda> References: <155238487986.23844.8099659458599168067.stgit@aravinda> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 x-cbid: 19031210-0064-0000-0000-000003B88367 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00010744; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000281; SDB=6.01173230; UDB=6.00613396; IPR=6.00953889; MB=3.00025943; MTD=3.00000008; XFM=3.00000015; UTC=2019-03-12 10:03:06 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19031210-0065-0000-0000-00003CB18FE5 Message-Id: <155238498047.23844.16953905154359642986.stgit@aravinda> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-03-12_06:, , 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=1011 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-1903120072 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] X-Received-From: 148.163.158.5 Subject: [Qemu-devel] [PATCH v6 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: paulus@ozlabs.org, aravinda@linux.vnet.ibm.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" 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 --- hw/ppc/spapr.c | 25 +++++++++++++++++++++++++ hw/ppc/spapr_rtas.c | 36 ++++++++++++++++++++++++++++++++++++ include/hw/ppc/spapr.h | 15 ++++++++++++++- 3 files changed, 75 insertions(+), 1 deletion(-) diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index b6a571b..a533fbe 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -1757,6 +1757,16 @@ static void spapr_machine_reset(void) first_ppc_cpu->env.gpr[5] =3D 0; =20 spapr->cas_reboot =3D false; + + spapr->mc_reset =3D 1; + spapr->mc_status =3D -1; + spapr->guest_machine_check_addr =3D -1; + + /* Before destroying, signal vCPUs waiting on this condition */ + qemu_cond_broadcast(&spapr->mc_delivery_cond); + /* It is safe to call destroy as broadcast unblocks all vCPUs */ + qemu_cond_destroy(&spapr->mc_delivery_cond); + qemu_cond_init(&spapr->mc_delivery_cond); } =20 static void spapr_create_nvram(sPAPRMachineState *spapr) @@ -2047,6 +2057,16 @@ static const VMStateDescription vmstate_spapr_dtb = =3D { }, }; =20 +static const VMStateDescription vmstate_spapr_guest_mc_addr =3D { + .name =3D "spapr_guest_mc_addr", + .version_id =3D 1, + .minimum_version_id =3D 1, + .fields =3D (VMStateField[]) { + VMSTATE_UINT64(guest_machine_check_addr, sPAPRMachineState), + VMSTATE_END_OF_LIST() + }, +}; + static const VMStateDescription vmstate_spapr =3D { .name =3D "spapr", .version_id =3D 3, @@ -2077,6 +2097,7 @@ static const VMStateDescription vmstate_spapr =3D { &vmstate_spapr_irq_map, &vmstate_spapr_cap_nested_kvm_hv, &vmstate_spapr_dtb, + &vmstate_spapr_guest_mc_addr, NULL } }; @@ -3021,6 +3042,10 @@ static void spapr_machine_init(MachineState *machine) =20 kvmppc_spapr_enable_inkernel_multitce(); } + + spapr->mc_status =3D -1; + spapr->mc_reset =3D 0; + qemu_cond_init(&spapr->mc_delivery_cond); } =20 static int spapr_kvm_type(const char *vm_type) diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c index 7a2cb78..0c2aa0d 100644 --- a/hw/ppc/spapr_rtas.c +++ b/hw/ppc/spapr_rtas.c @@ -348,6 +348,38 @@ static void rtas_get_power_level(PowerPCCPU *cpu, sPAP= RMachineState *spapr, rtas_st(rets, 1, 100); } =20 +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) +{ + spapr->mc_reset =3D 0; + spapr->guest_machine_check_addr =3D 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) { + /* NMI register not called */ + rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); + } else { + /* + * VCPU issuing "ibm,nmi-interlock" is done with NMI handling, + * hence unset mc_status. + */ + spapr->mc_status =3D -1; + 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; @@ -489,6 +521,10 @@ 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); } =20 type_init(core_rtas_register_types) diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h index 59073a7..452f904 100644 --- a/include/hw/ppc/spapr.h +++ b/include/hw/ppc/spapr.h @@ -176,6 +176,17 @@ struct sPAPRMachineState { * occurs during the unplug process. */ QTAILQ_HEAD(, sPAPRDIMMState) pending_dimm_unplugs; =20 + /* 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; + /* mc_reset is set to 1 if machine reset is in progress */ + bool mc_reset; + QemuCond mc_delivery_cond; + /*< public >*/ char *kvm_type; char *host_model; @@ -608,8 +619,10 @@ target_ulong spapr_hypercall(PowerPCCPU *cpu, target_u= long 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) =20 -#define RTAS_TOKEN_MAX (RTAS_TOKEN_BASE + 0x2A) +#define RTAS_TOKEN_MAX (RTAS_TOKEN_BASE + 0x2C) =20 /* RTAS ibm,get-system-parameter token values */ #define RTAS_SYSPARM_SPLPAR_CHARACTERISTICS 20