From patchwork Fri Aug 18 14:11:56 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dongjiu Geng X-Patchwork-Id: 9908943 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 4AE7160382 for ; Fri, 18 Aug 2017 13:52:50 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 43FD728CC4 for ; Fri, 18 Aug 2017 13:52:50 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 386AF28CCF; Fri, 18 Aug 2017 13:52:50 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DC22B28CC4 for ; Fri, 18 Aug 2017 13:52:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753045AbdHRNth (ORCPT ); Fri, 18 Aug 2017 09:49:37 -0400 Received: from szxga04-in.huawei.com ([45.249.212.190]:4501 "EHLO szxga04-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752929AbdHRNtf (ORCPT ); Fri, 18 Aug 2017 09:49:35 -0400 Received: from 172.30.72.59 (EHLO DGGEMS414-HUB.china.huawei.com) ([172.30.72.59]) by dggrg04-dlp.huawei.com (MOS 4.4.6-GA FastPath queued) with ESMTP id DFK73365; Fri, 18 Aug 2017 21:48:34 +0800 (CST) Received: from linux.huawei.com (10.67.187.203) by DGGEMS414-HUB.china.huawei.com (10.3.19.214) with Microsoft SMTP Server id 14.3.301.0; Fri, 18 Aug 2017 21:48:24 +0800 From: Dongjiu Geng To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: , , , , Subject: [PATCH v5 6/7] KVM: arm64: Allow get exception information from userspace Date: Fri, 18 Aug 2017 22:11:56 +0800 Message-ID: <1503065517-7920-7-git-send-email-gengdongjiu@huawei.com> X-Mailer: git-send-email 1.7.7 In-Reply-To: <1503065517-7920-1-git-send-email-gengdongjiu@huawei.com> References: <1503065517-7920-1-git-send-email-gengdongjiu@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.67.187.203] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A090204.5996F035.002A, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2014-11-16 11:51:01, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 505379284ba42d73aa6ef2b43342c568 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP when userspace gets SIGBUS signal, it does not know whether this is a synchronous external abort or SError, so needs to get the exception syndrome. so this patch allows userspace can get this values. For syndrome, only give userspace syndrome EC and ISS. Now we move the synchronous external abort injection logic to userspace, when userspace injects the SEA exception to guest OS, it needs to specify the far_el1 value, so this patch give the exception virtual address to user space. Signed-off-by: Dongjiu Geng Signed-off-by: Quanming Wu --- arch/arm64/include/uapi/asm/kvm.h | 5 +++++ arch/arm64/kvm/guest.c | 35 +++++++++++++++++++++++++++++++++++ 2 files changed, 40 insertions(+) diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h index 9f3ca24bbcc6..514261f682b8 100644 --- a/arch/arm64/include/uapi/asm/kvm.h +++ b/arch/arm64/include/uapi/asm/kvm.h @@ -181,6 +181,11 @@ struct kvm_arch_memory_slot { #define KVM_REG_ARM64_SYSREG_OP2_MASK 0x0000000000000007 #define KVM_REG_ARM64_SYSREG_OP2_SHIFT 0 +/* AArch64 fault registers */ +#define KVM_REG_ARM64_FAULT (0x0014 << KVM_REG_ARM_COPROC_SHIFT) +#define KVM_REG_ARM64_FAULT_ESR_EC_ISS (0) +#define KVM_REG_ARM64_FAULT_FAR (1) + #define ARM64_SYS_REG_SHIFT_MASK(x,n) \ (((x) << KVM_REG_ARM64_SYSREG_ ## n ## _SHIFT) & \ KVM_REG_ARM64_SYSREG_ ## n ## _MASK) diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c index 5c7f657dd207..cb383c310f18 100644 --- a/arch/arm64/kvm/guest.c +++ b/arch/arm64/kvm/guest.c @@ -128,6 +128,38 @@ static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) out: return err; } +static int get_fault_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) +{ + void __user *uaddr = (void __user *)(unsigned long)reg->addr; + u32 ec, value; + u32 id = reg->id & ~(KVM_REG_ARCH_MASK | + KVM_REG_SIZE_MASK | KVM_REG_ARM64_FAULT); + + switch (id) { + case KVM_REG_ARM64_FAULT_ESR_EC_ISS: + /* The user space needs to know the fault exception + * class field + */ + ec = kvm_vcpu_get_hsr(vcpu) & ESR_ELx_EC_MASK; + value = ec | (kvm_vcpu_get_hsr(vcpu) & ESR_ELx_ISS_MASK); + + if (copy_to_user(uaddr, &value, KVM_REG_SIZE(reg->id)) != 0) + return -EFAULT; + break; + case KVM_REG_ARM64_FAULT_FAR: + /* when user space injects synchronized abort, it needs + * to inject the fault address. + */ + if (copy_to_user(uaddr, &(vcpu->arch.fault.far_el2), + KVM_REG_SIZE(reg->id)) != 0) + return -EFAULT; + break; + default: + return -ENOENT; + } + return 0; +} + int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) { @@ -243,6 +275,9 @@ int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE) return get_core_reg(vcpu, reg); + if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM64_FAULT) + return get_fault_reg(vcpu, reg); + if (is_timer_reg(reg->id)) return get_timer_reg(vcpu, reg);