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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 1hj3BB-0001SZ-5x; Thu, 04 Jul 2019 14:57:45 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hj3B8-0001SC-TF for linux-arm-kernel@lists.infradead.org; Thu, 04 Jul 2019 14:57:44 +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 66E6B28; Thu, 4 Jul 2019 07:57:42 -0700 (PDT) Received: from [10.1.197.61] (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id D44893F738; Thu, 4 Jul 2019 07:57:40 -0700 (PDT) Subject: Re: [PATCH 27/59] KVM: arm64: nv: Respect virtual HCR_EL2.TVM and TRVM settings To: Julien Thierry , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org References: <20190621093843.220980-1-marc.zyngier@arm.com> <20190621093843.220980-28-marc.zyngier@arm.com> From: Marc Zyngier Openpgp: preference=signencrypt Autocrypt: addr=marc.zyngier@arm.com; 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Linux aarch64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190704_075743_036261_2D533B7F X-CRM114-Status: GOOD ( 16.86 ) 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 26/06/2019 07:55, Julien Thierry wrote: > > > On 06/21/2019 10:38 AM, Marc Zyngier wrote: >> From: Jintack Lim >> >> Forward the EL1 virtual memory register traps to the virtual EL2 if they >> are not coming from the virtual EL2 and the virtual HCR_EL2.TVM or TRVM >> bit is set. >> >> This is for recursive nested virtualization. >> >> Signed-off-by: Jintack Lim >> Signed-off-by: Marc Zyngier >> --- >> arch/arm64/kvm/sys_regs.c | 24 ++++++++++++++++++++++++ >> 1 file changed, 24 insertions(+) >> >> diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c >> index 582d62aa48b7..0f74b9277a86 100644 >> --- a/arch/arm64/kvm/sys_regs.c >> +++ b/arch/arm64/kvm/sys_regs.c >> @@ -436,6 +436,27 @@ static bool access_dcsw(struct kvm_vcpu *vcpu, >> return true; >> } >> >> +/* This function is to support the recursive nested virtualization */ >> +static bool forward_vm_traps(struct kvm_vcpu *vcpu, struct sys_reg_params *p) >> +{ >> + u64 hcr_el2 = __vcpu_sys_reg(vcpu, HCR_EL2); >> + >> + /* If a trap comes from the virtual EL2, the host hypervisor handles. */ >> + if (vcpu_mode_el2(vcpu)) >> + return false; >> + >> + /* >> + * If the virtual HCR_EL2.TVM or TRVM bit is set, we need to foward >> + * this trap to the virtual EL2. >> + */ >> + if ((hcr_el2 & HCR_TVM) && p->is_write) >> + return true; >> + else if ((hcr_el2 & HCR_TRVM) && !p->is_write) >> + return true; >> + >> + return false; >> +} >> + >> /* >> * Generic accessor for VM registers. Only called as long as HCR_TVM >> * is set. If the guest enables the MMU, we stop trapping the VM >> @@ -452,6 +473,9 @@ static bool access_vm_reg(struct kvm_vcpu *vcpu, >> if (el12_reg(p) && forward_nv_traps(vcpu)) >> return false; >> >> + if (!el12_reg(p) && forward_vm_traps(vcpu, p)) >> + return kvm_inject_nested_sync(vcpu, kvm_vcpu_get_hsr(vcpu)); > > Since we already have forward_traps(), isn't this just: > > if (!el12_reg(p) && forward_traps(vcpu, p->is_write ? HCR_TVM : HCR_TRVM)) > return true; > > We could maybe simplify forward_vm_traps() to just call forward_traps() > similar to forward_nv_traps(). Odd. I remember doing something like that. Where has it gone? Yes, this looks sensible. Thanks, M. -- Jazz is not dead. It just smells funny... _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel