From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.0 required=3.0 tests=BAYES_00,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CD3CCC433FE for ; Thu, 10 Dec 2020 16:04:09 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 641A723EF1 for ; Thu, 10 Dec 2020 16:04:09 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 641A723EF1 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvmarm-bounces@lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 0BFA14B27D; Thu, 10 Dec 2020 11:04:09 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id tH+k6CClvj0X; Thu, 10 Dec 2020 11:04:07 -0500 (EST) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id BE7834B284; Thu, 10 Dec 2020 11:04:03 -0500 (EST) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id CE1884B1BF for ; Thu, 10 Dec 2020 11:04:01 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id sxkJzupZFkMj for ; Thu, 10 Dec 2020 11:04:00 -0500 (EST) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 45D6C4B29C for ; Thu, 10 Dec 2020 11:03:59 -0500 (EST) Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 5899A23EAF; Thu, 10 Dec 2020 16:03:58 +0000 (UTC) Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=why.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94) (envelope-from ) id 1knONG-0008Di-Ds; Thu, 10 Dec 2020 16:00:58 +0000 From: Marc Zyngier To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Subject: [PATCH v3 26/66] KVM: arm64: nv: Respect the virtual HCR_EL2.NV1 bit setting Date: Thu, 10 Dec 2020 15:59:22 +0000 Message-Id: <20201210160002.1407373-27-maz@kernel.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201210160002.1407373-1-maz@kernel.org> References: <20201210160002.1407373-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, andre.przywara@arm.com, christoffer.dall@arm.com, jintack@cs.columbia.edu, alexandru.elisei@arm.com, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com, kernel-team@android.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Cc: kernel-team@android.com, Andre Przywara X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu From: Jintack Lim Forward ELR_EL1, SPSR_EL1 and VBAR_EL1 traps to the virtual EL2 if the virtual HCR_EL2.NV bit is set. This is for recursive nested virtualization. Signed-off-by: Jintack Lim Signed-off-by: Marc Zyngier --- arch/arm64/include/asm/kvm_arm.h | 1 + arch/arm64/kvm/sys_regs.c | 28 +++++++++++++++++++++++++++- 2 files changed, 28 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h index c18edb1b35bf..3d2abc40d3a2 100644 --- a/arch/arm64/include/asm/kvm_arm.h +++ b/arch/arm64/include/asm/kvm_arm.h @@ -14,6 +14,7 @@ /* Hyp Configuration Register (HCR) bits */ #define HCR_ATA (UL(1) << 56) #define HCR_FWB (UL(1) << 46) +#define HCR_NV1 (UL(1) << 43) #define HCR_NV (UL(1) << 42) #define HCR_API (UL(1) << 41) #define HCR_APK (UL(1) << 40) diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index d09fda0fd76f..ea511e569ee0 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -299,6 +299,22 @@ static bool access_wi(struct kvm_vcpu *vcpu, return true; } +/* This function is to support the recursive nested virtualization */ +static bool forward_nv1_traps(struct kvm_vcpu *vcpu, struct sys_reg_params *p) +{ + return forward_traps(vcpu, HCR_NV1); +} + +static bool access_vbar_el1(struct kvm_vcpu *vcpu, + struct sys_reg_params *p, + const struct sys_reg_desc *r) +{ + if (forward_nv1_traps(vcpu, p)) + return false; + + return access_rw(vcpu, p, r); +} + static bool access_sctlr_el2(struct kvm_vcpu *vcpu, struct sys_reg_params *p, const struct sys_reg_desc *r) @@ -1589,6 +1605,7 @@ static bool access_sp_el1(struct kvm_vcpu *vcpu, return true; } + static bool access_elr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, const struct sys_reg_desc *r) @@ -1596,6 +1613,9 @@ static bool access_elr(struct kvm_vcpu *vcpu, if (el12_reg(p) && forward_nv_traps(vcpu)) return false; + if (!el12_reg(p) && forward_nv1_traps(vcpu, p)) + return false; + if (p->is_write) vcpu_write_sys_reg(vcpu, p->regval, ELR_EL1); else @@ -1611,6 +1631,9 @@ static bool access_spsr(struct kvm_vcpu *vcpu, if (el12_reg(p) && forward_nv_traps(vcpu)) return false; + if (!el12_reg(p) && forward_nv1_traps(vcpu, p)) + return false; + if (p->is_write) __vcpu_sys_reg(vcpu, SPSR_EL1) = p->regval; else @@ -1626,6 +1649,9 @@ static bool access_spsr_el2(struct kvm_vcpu *vcpu, if (el12_reg(p) && forward_nv_traps(vcpu)) return false; + if (!el12_reg(p) && forward_nv1_traps(vcpu, p)) + return false; + if (p->is_write) vcpu_write_sys_reg(vcpu, p->regval, SPSR_EL2); else @@ -1817,7 +1843,7 @@ static const struct sys_reg_desc sys_reg_descs[] = { { SYS_DESC(SYS_LORC_EL1), trap_loregion }, { SYS_DESC(SYS_LORID_EL1), trap_loregion }, - { SYS_DESC(SYS_VBAR_EL1), access_rw, reset_val, VBAR_EL1, 0 }, + { SYS_DESC(SYS_VBAR_EL1), access_vbar_el1, reset_val, VBAR_EL1, 0 }, { SYS_DESC(SYS_DISR_EL1), NULL, reset_val, DISR_EL1, 0 }, { SYS_DESC(SYS_ICC_IAR0_EL1), write_to_read_only }, -- 2.29.2 _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm