From nobody Mon Feb 9 20:12:40 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1580451950251212.09949621778935; Thu, 30 Jan 2020 22:25:50 -0800 (PST) Received: from localhost ([::1]:48976 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ixPkT-0001OM-39 for importer@patchew.org; Fri, 31 Jan 2020 01:25:49 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:59784) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ixPVQ-00081I-P4 for qemu-devel@nongnu.org; Fri, 31 Jan 2020 01:10:18 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ixPVP-00019N-Ax for qemu-devel@nongnu.org; Fri, 31 Jan 2020 01:10:16 -0500 Received: from bilbo.ozlabs.org ([2401:3900:2:1::2]:33673 helo=ozlabs.org) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ixPVO-0000fN-VM; Fri, 31 Jan 2020 01:10:15 -0500 Received: by ozlabs.org (Postfix, from userid 1007) id 4886Hw579Kz9sSr; Fri, 31 Jan 2020 17:09:32 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gibson.dropbear.id.au; s=201602; t=1580450972; bh=W4NiEDR/AFqbp4X4jXnBnkJsZydyt4U2Uc5GDM2GCFg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WFQQ4p57+qk4fRjApHeSbyYtkEQxkFZAf5ZLXlKSxMoMus/agbfYX9IVoYhQ2YhJl oqasfEHGugI2TuXQIdFMoab1HB/PYKLZvYdjmTE6MB6AJa2o91cUzlNGg1iYqh9dyU 7spLnIe/A96p1mxWQw5vl2zogKmeTsCXL3R9F2GU= From: David Gibson To: peter.maydell@linaro.org Subject: [PULL 28/34] ppc: spapr: Handle "ibm, nmi-register" and "ibm, nmi-interlock" RTAS calls Date: Fri, 31 Jan 2020 17:09:18 +1100 Message-Id: <20200131060924.147449-29-david@gibson.dropbear.id.au> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200131060924.147449-1-david@gibson.dropbear.id.au> References: <20200131060924.147449-1-david@gibson.dropbear.id.au> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2401:3900:2:1::2 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: lvivier@redhat.com, Aravinda Prasad , qemu-devel@nongnu.org, groug@kaod.org, Ganesh Goudar , qemu-ppc@nongnu.org, David Gibson Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" From: Aravinda Prasad 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. Signed-off-by: Aravinda Prasad [Register fwnmi RTAS calls in core_rtas_register_types() where other RTAS calls are registered] Signed-off-by: Ganesh Goudar Message-Id: <20200130184423.20519-6-ganeshgr@linux.ibm.com> Signed-off-by: David Gibson --- hw/ppc/spapr_caps.c | 10 +++++++ hw/ppc/spapr_rtas.c | 59 ++++++++++++++++++++++++++++++++++++++++++ include/hw/ppc/spapr.h | 4 ++- 3 files changed, 72 insertions(+), 1 deletion(-) diff --git a/hw/ppc/spapr_caps.c b/hw/ppc/spapr_caps.c index 393ee6845e..8b27d3ac09 100644 --- a/hw/ppc/spapr_caps.c +++ b/hw/ppc/spapr_caps.c @@ -515,6 +515,16 @@ static void cap_fwnmi_mce_apply(SpaprMachineState *spa= pr, uint8_t val, if (!val) { return; /* Disabled by default */ } + + if (tcg_enabled()) { + warn_report("Firmware Assisted Non-Maskable Interrupts(FWNMI) not " + "supported in TCG"); + } else if (kvm_enabled()) { + if (kvmppc_set_fwnmi() < 0) { + error_setg(errp, "Firmware Assisted Non-Maskable Interrupts(FW= NMI) " + "not supported by KVM"); + } + } } =20 SpaprCapabilityInfo capability_table[SPAPR_CAP_NUM] =3D { diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c index 89b7eb6c54..35d91260e6 100644 --- a/hw/ppc/spapr_rtas.c +++ b/hw/ppc/spapr_rtas.c @@ -399,6 +399,61 @@ 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) +{ + hwaddr rtas_addr; + + if (spapr_get_cap(spapr, SPAPR_CAP_FWNMI_MCE) =3D=3D SPAPR_CAP_OFF) { + rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED); + return; + } + + rtas_addr =3D spapr_get_rtas_addr(); + if (!rtas_addr) { + rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED); + return; + } + + 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_get_cap(spapr, SPAPR_CAP_FWNMI_MCE) =3D=3D SPAPR_CAP_OFF) { + rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED); + return; + } + + if (spapr->guest_machine_check_addr =3D=3D -1) { + /* NMI register not called */ + rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); + return; + } + + if (spapr->mc_status !=3D cpu->vcpu_id) { + /* The vCPU that hit the NMI should invoke "ibm,nmi-interlock" */ + rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); + return; + } + + /* + * 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; @@ -527,6 +582,10 @@ 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 652a5514e8..f6f82d88aa 100644 --- a/include/hw/ppc/spapr.h +++ b/include/hw/ppc/spapr.h @@ -656,8 +656,10 @@ target_ulong spapr_hypercall(PowerPCCPU *cpu, target_u= long opcode, #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_SUSPEND_ME (RTAS_TOKEN_BASE + 0x2A) +#define RTAS_IBM_NMI_REGISTER (RTAS_TOKEN_BASE + 0x2B) +#define RTAS_IBM_NMI_INTERLOCK (RTAS_TOKEN_BASE + 0x2C) =20 -#define RTAS_TOKEN_MAX (RTAS_TOKEN_BASE + 0x2B) +#define RTAS_TOKEN_MAX (RTAS_TOKEN_BASE + 0x2D) =20 /* RTAS ibm,get-system-parameter token values */ #define RTAS_SYSPARM_SPLPAR_CHARACTERISTICS 20 --=20 2.24.1