Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755284AbcKUWhn (ORCPT ); Mon, 21 Nov 2016 17:37:43 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:41960 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754518AbcKUWhi (ORCPT ); Mon, 21 Nov 2016 17:37:38 -0500 DMARC-Filter: OpenDMARC Filter v1.3.1 smtp.codeaurora.org E9B9B61660 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=pass smtp.mailfrom=tbaicar@codeaurora.org From: Tyler Baicar To: marc.zyngier@arm.com, pbonzini@redhat.com, rkrcmar@redhat.com, linux@armlinux.org.uk, catalin.marinas@arm.com, will.deacon@arm.com, rjw@rjwysocki.net, lenb@kernel.org, matt@codeblueprint.co.uk, robert.moore@intel.com, lv.zheng@intel.com, nkaje@codeaurora.org, zjzhang@codeaurora.org, mark.rutland@arm.com, james.morse@arm.com, akpm@linux-foundation.org, eun.taik.lee@samsung.com, sandeepa.s.prabhu@gmail.com, shijie.huang@arm.com, rruigrok@codeaurora.org, paul.gortmaker@windriver.com, tomasz.nowicki@linaro.org, fu.wei@linaro.org, rostedt@goodmis.org, bristot@redhat.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, linux-efi@vger.kernel.org, Suzuki.Poulose@arm.com, punit.agrawal@arm.com, astone@redhat.com, harba@codeaurora.org, hanjun.guo@linaro.org Cc: Tyler Baicar Subject: [PATCH V5 10/10] arm/arm64: KVM: add guest SEA support Date: Mon, 21 Nov 2016 15:36:03 -0700 Message-Id: <1479767763-27532-11-git-send-email-tbaicar@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1479767763-27532-1-git-send-email-tbaicar@codeaurora.org> References: <1479767763-27532-1-git-send-email-tbaicar@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4592 Lines: 127 Currently external aborts are unsupported by the guest abort handling. Add handling for SEAs so that the host kernel reports SEAs which occur in the guest kernel. Signed-off-by: Tyler Baicar --- arch/arm/include/asm/kvm_arm.h | 1 + arch/arm/include/asm/system_misc.h | 5 +++++ arch/arm/kvm/mmu.c | 18 ++++++++++++++++-- arch/arm64/include/asm/kvm_arm.h | 1 + arch/arm64/include/asm/system_misc.h | 2 ++ arch/arm64/mm/fault.c | 13 +++++++++++++ 6 files changed, 38 insertions(+), 2 deletions(-) diff --git a/arch/arm/include/asm/kvm_arm.h b/arch/arm/include/asm/kvm_arm.h index e22089f..33a77509 100644 --- a/arch/arm/include/asm/kvm_arm.h +++ b/arch/arm/include/asm/kvm_arm.h @@ -187,6 +187,7 @@ #define FSC_FAULT (0x04) #define FSC_ACCESS (0x08) #define FSC_PERM (0x0c) +#define FSC_EXTABT (0x10) /* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */ #define HPFAR_MASK (~0xf) diff --git a/arch/arm/include/asm/system_misc.h b/arch/arm/include/asm/system_misc.h index a3d61ad..ea45d94 100644 --- a/arch/arm/include/asm/system_misc.h +++ b/arch/arm/include/asm/system_misc.h @@ -24,4 +24,9 @@ extern unsigned int user_debug; #endif /* !__ASSEMBLY__ */ +static inline int handle_guest_sea(unsigned long addr, unsigned int esr) +{ + return -1; +} + #endif /* __ASM_ARM_SYSTEM_MISC_H */ diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c index e9a5c0e..1152966 100644 --- a/arch/arm/kvm/mmu.c +++ b/arch/arm/kvm/mmu.c @@ -29,6 +29,7 @@ #include #include #include +#include #include "trace.h" @@ -1441,8 +1442,21 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run) /* Check the stage-2 fault is trans. fault or write fault */ fault_status = kvm_vcpu_trap_get_fault_type(vcpu); - if (fault_status != FSC_FAULT && fault_status != FSC_PERM && - fault_status != FSC_ACCESS) { + + /* The host kernel will handle the synchronous external abort. There + * is no need to pass the error into the guest. + */ + if (fault_status == FSC_EXTABT) { + if(handle_guest_sea((unsigned long)fault_ipa, + kvm_vcpu_get_hsr(vcpu))) { + kvm_err("Failed to handle guest SEA, FSC: EC=%#x xFSC=%#lx ESR_EL2=%#lx\n", + kvm_vcpu_trap_get_class(vcpu), + (unsigned long)kvm_vcpu_trap_get_fault(vcpu), + (unsigned long)kvm_vcpu_get_hsr(vcpu)); + return -EFAULT; + } + } else if (fault_status != FSC_FAULT && fault_status != FSC_PERM && + fault_status != FSC_ACCESS) { kvm_err("Unsupported FSC: EC=%#x xFSC=%#lx ESR_EL2=%#lx\n", kvm_vcpu_trap_get_class(vcpu), (unsigned long)kvm_vcpu_trap_get_fault(vcpu), diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h index 4b5c977..be0efb6 100644 --- a/arch/arm64/include/asm/kvm_arm.h +++ b/arch/arm64/include/asm/kvm_arm.h @@ -201,6 +201,7 @@ #define FSC_FAULT ESR_ELx_FSC_FAULT #define FSC_ACCESS ESR_ELx_FSC_ACCESS #define FSC_PERM ESR_ELx_FSC_PERM +#define FSC_EXTABT ESR_ELx_FSC_EXTABT /* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */ #define HPFAR_MASK (~UL(0xf)) diff --git a/arch/arm64/include/asm/system_misc.h b/arch/arm64/include/asm/system_misc.h index 9040e1d..3a142a5 100644 --- a/arch/arm64/include/asm/system_misc.h +++ b/arch/arm64/include/asm/system_misc.h @@ -77,4 +77,6 @@ extern void (*arm_pm_restart)(enum reboot_mode reboot_mode, const char *cmd); int register_synchronous_ext_abort_notifier(struct notifier_block *nb); void unregister_synchronous_ext_abort_notifier(struct notifier_block *nb); +int handle_guest_sea(unsigned long addr, unsigned int esr); + #endif /* __ASM_SYSTEM_MISC_H */ diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index fcc49f1..691399e 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -597,6 +597,19 @@ static const char *fault_name(unsigned int esr) } /* + * Handle Synchronous External Aborts that occur in a guest kernel. + */ +int handle_guest_sea(unsigned long addr, unsigned int esr) +{ + atomic_notifier_call_chain(&sea_handler_chain, 0, NULL); + + pr_err("Synchronous External Abort: %s (0x%08x) at 0x%016lx\n", + fault_name(esr), esr, addr); + + return 0; +} + +/* * Dispatch a data abort to the relevant handler. */ asmlinkage void __exception do_mem_abort(unsigned long addr, unsigned int esr, -- Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc. 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