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Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hfmIO-0006P0-HL; Tue, 25 Jun 2019 14:19:40 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hfmII-0006OA-Cp for linux-arm-kernel@lists.infradead.org; Tue, 25 Jun 2019 14:19:38 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id D6A8F2B; Tue, 25 Jun 2019 07:19:33 -0700 (PDT) Received: from [10.37.8.194] (unknown [10.37.8.194]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 0F57E3F718; Tue, 25 Jun 2019 07:19:31 -0700 (PDT) Subject: Re: [PATCH 23/59] KVM: arm64: nv: Respect virtual HCR_EL2.TWX setting To: Marc Zyngier , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org References: <20190621093843.220980-1-marc.zyngier@arm.com> <20190621093843.220980-24-marc.zyngier@arm.com> From: Julien Thierry Message-ID: <53793288-0d5d-4212-c1f4-ffa6a790d1c4@arm.com> Date: Tue, 25 Jun 2019 15:19:30 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20190621093843.220980-24-marc.zyngier@arm.com> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190625_071934_530490_29427D04 X-CRM114-Status: GOOD ( 25.82 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Suzuki K Poulose , Andre Przywara , Christoffer Dall , Dave Martin , James Morse , Jintack Lim Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 06/21/2019 10:38 AM, Marc Zyngier wrote: > From: Jintack Lim > > Forward exceptions due to WFI or WFE instructions to the virtual EL2 if > they are not coming from the virtual EL2 and virtual HCR_EL2.TWX is set. > > Signed-off-by: Jintack Lim > Signed-off-by: Marc Zyngier > --- > arch/arm64/include/asm/kvm_nested.h | 2 ++ > arch/arm64/kvm/Makefile | 1 + > arch/arm64/kvm/handle_exit.c | 13 +++++++++- > arch/arm64/kvm/nested.c | 39 +++++++++++++++++++++++++++++ > 4 files changed, 54 insertions(+), 1 deletion(-) > create mode 100644 arch/arm64/kvm/nested.c > > diff --git a/arch/arm64/include/asm/kvm_nested.h b/arch/arm64/include/asm/kvm_nested.h > index 8a3d121a0b42..645e5e11b749 100644 > --- a/arch/arm64/include/asm/kvm_nested.h > +++ b/arch/arm64/include/asm/kvm_nested.h > @@ -10,4 +10,6 @@ static inline bool nested_virt_in_use(const struct kvm_vcpu *vcpu) > test_bit(KVM_ARM_VCPU_NESTED_VIRT, vcpu->arch.features); > } > > +int handle_wfx_nested(struct kvm_vcpu *vcpu, bool is_wfe); > + > #endif /* __ARM64_KVM_NESTED_H */ > diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile > index 9e450aea7db6..f11bd8b0d837 100644 > --- a/arch/arm64/kvm/Makefile > +++ b/arch/arm64/kvm/Makefile > @@ -36,4 +36,5 @@ kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/irqchip.o > kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/arch_timer.o > kvm-$(CONFIG_KVM_ARM_PMU) += $(KVM)/arm/pmu.o > > +kvm-$(CONFIG_KVM_ARM_HOST) += nested.o > kvm-$(CONFIG_KVM_ARM_HOST) += emulate-nested.o > diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c > index e348c15c81bc..ddba212fd6ec 100644 > --- a/arch/arm64/kvm/handle_exit.c > +++ b/arch/arm64/kvm/handle_exit.c > @@ -127,7 +127,18 @@ static int handle_no_fpsimd(struct kvm_vcpu *vcpu, struct kvm_run *run) > */ > static int kvm_handle_wfx(struct kvm_vcpu *vcpu, struct kvm_run *run) > { > - if (kvm_vcpu_get_hsr(vcpu) & ESR_ELx_WFx_ISS_WFE) { > + bool is_wfe = !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_WFx_ISS_WFE); > + > + if (nested_virt_in_use(vcpu)) { > + int ret = handle_wfx_nested(vcpu, is_wfe); > + > + if (ret < 0 && ret != -EINVAL) > + return ret; > + else if (ret >= 0) > + return ret; I think you can simplify this: if (ret != -EINVAL) return ret; Cheers, Julien > + } > + > + if (is_wfe) { > trace_kvm_wfx_arm64(*vcpu_pc(vcpu), true); > vcpu->stat.wfe_exit_stat++; > kvm_vcpu_on_spin(vcpu, vcpu_mode_priv(vcpu)); > diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c > new file mode 100644 > index 000000000000..3872e3cf1691 > --- /dev/null > +++ b/arch/arm64/kvm/nested.c > @@ -0,0 +1,39 @@ > +/* > + * Copyright (C) 2017 - Columbia University and Linaro Ltd. > + * Author: Jintack Lim > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License version 2 as > + * published by the Free Software Foundation. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + * > + * You should have received a copy of the GNU General Public License > + * along with this program. If not, see . > + */ > + > +#include > +#include > + > +#include > + > +/* > + * Inject wfx to the virtual EL2 if this is not from the virtual EL2 and > + * the virtual HCR_EL2.TWX is set. Otherwise, let the host hypervisor > + * handle this. > + */ > +int handle_wfx_nested(struct kvm_vcpu *vcpu, bool is_wfe) > +{ > + u64 hcr_el2 = __vcpu_sys_reg(vcpu, HCR_EL2); > + > + if (vcpu_mode_el2(vcpu)) > + return -EINVAL; > + > + if ((is_wfe && (hcr_el2 & HCR_TWE)) || (!is_wfe && (hcr_el2 & HCR_TWI))) > + return kvm_inject_nested_sync(vcpu, kvm_vcpu_get_hsr(vcpu)); > + > + return -EINVAL; > +} > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel