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Mon, 09 Sep 2019 07:24:30 +0000 Received: from b01ledav005.gho.pok.ibm.com (b01ledav005.gho.pok.ibm.com [9.57.199.110]) by b01cxnp22036.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x897OUtX41746720 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 9 Sep 2019 07:24:30 GMT Received: from b01ledav005.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 75BB9AE062; Mon, 9 Sep 2019 07:24:30 +0000 (GMT) Received: from b01ledav005.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 98376AE05F; Mon, 9 Sep 2019 07:24:28 +0000 (GMT) Received: from [127.0.1.1] (unknown [9.124.31.235]) by b01ledav005.gho.pok.ibm.com (Postfix) with ESMTP; Mon, 9 Sep 2019 07:24:28 +0000 (GMT) From: Aravinda Prasad To: aik@ozlabs.ru, qemu-ppc@nongnu.org, qemu-devel@nongnu.org, david@gibson.dropbear.id.au Date: Mon, 09 Sep 2019 12:54:27 +0530 Message-ID: <156801386747.24362.10187403626037630874.stgit@aravinda> In-Reply-To: <156801373576.24362.1904051970114447107.stgit@aravinda> References: <156801373576.24362.1904051970114447107.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-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-09-09_04:, , 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=865 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1909090081 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] X-Received-From: 148.163.158.5 Subject: [Qemu-devel] [PATCH v13 2/6] ppc: spapr: Introduce FWNMI capability 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@linux.vnet.ibm.com, groug@kaod.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Introduce the KVM capability KVM_CAP_PPC_FWNMI so that the KVM causes guest exit with NMI as exit reason when it encounters a machine check exception on the address belonging to a guest. Without this capability enabled, KVM redirects machine check exceptions to guest's 0x200 vector. This patch also introduces fwnmi-mce capability to deal with the case when a guest with the KVM_CAP_PPC_FWNMI capability enabled is attempted to migrate to a host that does not support this capability. Signed-off-by: Aravinda Prasad --- hw/ppc/spapr.c | 1 + hw/ppc/spapr_caps.c | 29 +++++++++++++++++++++++++++++ include/hw/ppc/spapr.h | 4 +++- target/ppc/kvm.c | 26 ++++++++++++++++++++++++++ target/ppc/kvm_ppc.h | 12 ++++++++++++ 5 files changed, 71 insertions(+), 1 deletion(-) diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index ea56499..8288e8b 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -4487,6 +4487,7 @@ static void spapr_machine_class_init(ObjectClass *oc,= void *data) smc->default_caps.caps[SPAPR_CAP_NESTED_KVM_HV] =3D SPAPR_CAP_OFF; smc->default_caps.caps[SPAPR_CAP_LARGE_DECREMENTER] =3D SPAPR_CAP_ON; smc->default_caps.caps[SPAPR_CAP_CCF_ASSIST] =3D SPAPR_CAP_OFF; + smc->default_caps.caps[SPAPR_CAP_FWNMI_MCE] =3D SPAPR_CAP_OFF; spapr_caps_add_properties(smc, &error_abort); smc->irq =3D &spapr_irq_dual; smc->dr_phb_enabled =3D true; diff --git a/hw/ppc/spapr_caps.c b/hw/ppc/spapr_caps.c index 481dfd2..c11ff87 100644 --- a/hw/ppc/spapr_caps.c +++ b/hw/ppc/spapr_caps.c @@ -496,6 +496,25 @@ static void cap_ccf_assist_apply(SpaprMachineState *sp= apr, uint8_t val, } } =20 +static void cap_fwnmi_mce_apply(SpaprMachineState *spapr, uint8_t val, + Error **errp) +{ + if (!val) { + return; /* Disabled by default */ + } + + if (tcg_enabled()) { + /* + * TCG support may not be correct in some conditions (e.g., in case + * of software injected faults like duplicate SLBs). + */ + warn_report("Firmware Assisted Non-Maskable Interrupts not support= ed in TCG"); + } else if (kvm_enabled() && !kvmppc_has_cap_ppc_fwnmi()) { + error_setg(errp, +"Firmware Assisted Non-Maskable Interrupts not supported by KVM, try cap-f= wnmi-mce=3Doff"); + } +} + SpaprCapabilityInfo capability_table[SPAPR_CAP_NUM] =3D { [SPAPR_CAP_HTM] =3D { .name =3D "htm", @@ -595,6 +614,15 @@ SpaprCapabilityInfo capability_table[SPAPR_CAP_NUM] = =3D { .type =3D "bool", .apply =3D cap_ccf_assist_apply, }, + [SPAPR_CAP_FWNMI_MCE] =3D { + .name =3D "fwnmi-mce", + .description =3D "Handle fwnmi machine check exceptions", + .index =3D SPAPR_CAP_FWNMI_MCE, + .get =3D spapr_cap_get_bool, + .set =3D spapr_cap_set_bool, + .type =3D "bool", + .apply =3D cap_fwnmi_mce_apply, + }, }; =20 static SpaprCapabilities default_caps_with_cpu(SpaprMachineState *spapr, @@ -734,6 +762,7 @@ SPAPR_CAP_MIG_STATE(hpt_maxpagesize, SPAPR_CAP_HPT_MAXP= AGESIZE); SPAPR_CAP_MIG_STATE(nested_kvm_hv, SPAPR_CAP_NESTED_KVM_HV); SPAPR_CAP_MIG_STATE(large_decr, SPAPR_CAP_LARGE_DECREMENTER); SPAPR_CAP_MIG_STATE(ccf_assist, SPAPR_CAP_CCF_ASSIST); +SPAPR_CAP_MIG_STATE(fwnmi, SPAPR_CAP_FWNMI_MCE); =20 void spapr_caps_init(SpaprMachineState *spapr) { diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h index 03111fd..66049ac 100644 --- a/include/hw/ppc/spapr.h +++ b/include/hw/ppc/spapr.h @@ -79,8 +79,10 @@ typedef enum { #define SPAPR_CAP_LARGE_DECREMENTER 0x08 /* Count Cache Flush Assist HW Instruction */ #define SPAPR_CAP_CCF_ASSIST 0x09 +/* FWNMI machine check handling */ +#define SPAPR_CAP_FWNMI_MCE 0x0A /* Num Caps */ -#define SPAPR_CAP_NUM (SPAPR_CAP_CCF_ASSIST + 1) +#define SPAPR_CAP_NUM (SPAPR_CAP_FWNMI_MCE + 1) =20 /* * Capability Values diff --git a/target/ppc/kvm.c b/target/ppc/kvm.c index 8c5b1f2..8b1ab78 100644 --- a/target/ppc/kvm.c +++ b/target/ppc/kvm.c @@ -85,6 +85,7 @@ static int cap_ppc_safe_indirect_branch; static int cap_ppc_count_cache_flush_assist; static int cap_ppc_nested_kvm_hv; static int cap_large_decr; +static int cap_ppc_fwnmi; =20 static uint32_t debug_inst_opcode; =20 @@ -2055,6 +2056,26 @@ void kvmppc_set_mpic_proxy(PowerPCCPU *cpu, int mpic= _proxy) } } =20 +int kvmppc_set_fwnmi(void) +{ + PowerPCCPU *cpu =3D POWERPC_CPU(first_cpu); + CPUState *cs =3D CPU(cpu); + int ret; + + ret =3D kvm_vcpu_enable_cap(cs, KVM_CAP_PPC_FWNMI, 0); + if (ret) { + error_report("This KVM version does not support FWNMI"); + return ret; + } + + /* + * cap_ppc_fwnmi is set when FWNMI is available and enabled in KVM + * and not just when FWNMI is available in KVM + */ + cap_ppc_fwnmi =3D 1; + return ret; +} + int kvmppc_smt_threads(void) { return cap_ppc_smt ? cap_ppc_smt : 1; @@ -2355,6 +2376,11 @@ bool kvmppc_has_cap_mmu_hash_v3(void) return cap_mmu_hash_v3; } =20 +bool kvmppc_has_cap_ppc_fwnmi(void) +{ + return cap_ppc_fwnmi; +} + static bool kvmppc_power8_host(void) { bool ret =3D false; diff --git a/target/ppc/kvm_ppc.h b/target/ppc/kvm_ppc.h index 98bd7d5..ce5c1f9 100644 --- a/target/ppc/kvm_ppc.h +++ b/target/ppc/kvm_ppc.h @@ -27,6 +27,8 @@ void kvmppc_enable_h_page_init(void); void kvmppc_set_papr(PowerPCCPU *cpu); int kvmppc_set_compat(PowerPCCPU *cpu, uint32_t compat_pvr); void kvmppc_set_mpic_proxy(PowerPCCPU *cpu, int mpic_proxy); +int kvmppc_set_fwnmi(void); +bool kvmppc_has_cap_ppc_fwnmi(void); int kvmppc_smt_threads(void); void kvmppc_hint_smt_possible(Error **errp); int kvmppc_set_smt_threads(int smt); @@ -159,6 +161,16 @@ static inline void kvmppc_set_mpic_proxy(PowerPCCPU *c= pu, int mpic_proxy) { } =20 +static inline int kvmppc_set_fwnmi(void) +{ + return -1; +} + +static inline bool kvmppc_has_cap_ppc_fwnmi(void) +{ + return false; +} + static inline int kvmppc_smt_threads(void) { return 1;