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=-17.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 DBA32C433DB for ; Thu, 18 Mar 2021 12:28:50 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 6641064E6B for ; Thu, 18 Mar 2021 12:28:50 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6641064E6B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:Cc:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=WFfiPuhLtf/CFFjuPYZK43L7W1hP2Ur5kWVipodkt8I=; b=HTXnsI61R+3ttAV4I22uwhyBh PZA7Ejc7XaZo8S6JDro+YwkGlAPPKkfnmJyj6EBa5UE0mZI1v6njG3eDDDnBoa846aZPHffns44vX vydGlgqpgS7wzCRSdgHvI1+iiwfk4zbTc8nMhpSTnrbF0P4WCCa6u4aHJ1kPoLPPlvUkllziIIYwn y+LWOqupWUMy3X3n4nk7clQBtuFgf1yHxIbEPC2fY2nlCOANlL/cfR0BjHd0AddvfjYwLhePP61qW YiyR9+gHgwPq6PSPJKXKs0b2B7kkSvDO5HOxf2CKyMw2UEMTrjOwG4+9cumE1JyZS86cPjHbB5cdY c0BBsNc8w==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lMrjz-005CC5-7o; Thu, 18 Mar 2021 12:27:03 +0000 Received: from mail.kernel.org ([198.145.29.99]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lMrip-005Bv0-T7 for linux-arm-kernel@lists.infradead.org; Thu, 18 Mar 2021 12:25:55 +0000 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 1BA9664F6F; Thu, 18 Mar 2021 12:25:48 +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 1lMrik-002OZW-AQ; Thu, 18 Mar 2021 12:25:46 +0000 From: Marc Zyngier To: kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org Cc: dave.martin@arm.com, daniel.kiss@arm.com, Will Deacon , Catalin Marinas , James Morse , Julien Thierry , Suzuki K Poulose , broonie@kernel.org, ascull@google.com, qperret@google.com, kernel-team@android.com Subject: [PATCH v2 06/11] KVM: arm64: Rework SVE host-save/guest-restore Date: Thu, 18 Mar 2021 12:25:27 +0000 Message-Id: <20210318122532.505263-7-maz@kernel.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210318122532.505263-1-maz@kernel.org> References: <20210318122532.505263-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, dave.martin@arm.com, daniel.kiss@arm.com, will@kernel.org, catalin.marinas@arm.com, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com, broonie@kernel.org, ascull@google.com, qperret@google.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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210318_122552_510618_F9B1437C X-CRM114-Status: GOOD ( 17.62 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org In order to keep the code readable, move the host-save/guest-restore sequences in their own functions, with the following changes: - the hypervisor ZCR is now set from C code - ZCR_EL2 is always used as the EL2 accessor This results in some minor assembler macro rework. No functional change intended. Acked-by: Will Deacon Signed-off-by: Marc Zyngier --- arch/arm64/include/asm/fpsimdmacros.h | 8 +++-- arch/arm64/include/asm/kvm_hyp.h | 2 +- arch/arm64/kvm/hyp/fpsimd.S | 2 +- arch/arm64/kvm/hyp/include/hyp/switch.h | 40 +++++++++++++++---------- 4 files changed, 32 insertions(+), 20 deletions(-) diff --git a/arch/arm64/include/asm/fpsimdmacros.h b/arch/arm64/include/asm/fpsimdmacros.h index e9b72d35b867..a2563992d2dc 100644 --- a/arch/arm64/include/asm/fpsimdmacros.h +++ b/arch/arm64/include/asm/fpsimdmacros.h @@ -232,8 +232,7 @@ str w\nxtmp, [\xpfpsr, #4] .endm -.macro sve_load nxbase, xpfpsr, xvqminus1, nxtmp, xtmp2 - sve_load_vq \xvqminus1, x\nxtmp, \xtmp2 +.macro __sve_load nxbase, xpfpsr, nxtmp _for n, 0, 31, _sve_ldr_v \n, \nxbase, \n - 34 _sve_ldr_p 0, \nxbase _sve_wrffr 0 @@ -244,3 +243,8 @@ ldr w\nxtmp, [\xpfpsr, #4] msr fpcr, x\nxtmp .endm + +.macro sve_load nxbase, xpfpsr, xvqminus1, nxtmp, xtmp2 + sve_load_vq \xvqminus1, x\nxtmp, \xtmp2 + __sve_load \nxbase, \xpfpsr, \nxtmp +.endm diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_hyp.h index e8b0f7fcd86b..a3e89424ae63 100644 --- a/arch/arm64/include/asm/kvm_hyp.h +++ b/arch/arm64/include/asm/kvm_hyp.h @@ -86,7 +86,7 @@ void __debug_switch_to_host(struct kvm_vcpu *vcpu); void __fpsimd_save_state(struct user_fpsimd_state *fp_regs); void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs); void __sve_save_state(void *sve_pffr, u32 *fpsr); -void __sve_restore_state(void *sve_pffr, u32 *fpsr, unsigned int vqminus1); +void __sve_restore_state(void *sve_pffr, u32 *fpsr); #ifndef __KVM_NVHE_HYPERVISOR__ void activate_traps_vhe_load(struct kvm_vcpu *vcpu); diff --git a/arch/arm64/kvm/hyp/fpsimd.S b/arch/arm64/kvm/hyp/fpsimd.S index 95b22e10996c..3c635929771a 100644 --- a/arch/arm64/kvm/hyp/fpsimd.S +++ b/arch/arm64/kvm/hyp/fpsimd.S @@ -21,7 +21,7 @@ SYM_FUNC_START(__fpsimd_restore_state) SYM_FUNC_END(__fpsimd_restore_state) SYM_FUNC_START(__sve_restore_state) - sve_load 0, x1, x2, 3, x4 + __sve_load 0, x1, 2 ret SYM_FUNC_END(__sve_restore_state) diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h index fb68271c1a0f..8071e1cad289 100644 --- a/arch/arm64/kvm/hyp/include/hyp/switch.h +++ b/arch/arm64/kvm/hyp/include/hyp/switch.h @@ -196,6 +196,24 @@ static inline bool __populate_fault_info(struct kvm_vcpu *vcpu) return true; } +static inline void __hyp_sve_save_host(struct kvm_vcpu *vcpu) +{ + struct thread_struct *thread; + + thread = container_of(vcpu->arch.host_fpsimd_state, struct thread_struct, + uw.fpsimd_state); + + __sve_save_state(sve_pffr(thread), &vcpu->arch.host_fpsimd_state->fpsr); +} + +static inline void __hyp_sve_restore_guest(struct kvm_vcpu *vcpu) +{ + sve_cond_update_zcr_vq(vcpu_sve_max_vq(vcpu) - 1, SYS_ZCR_EL2); + __sve_restore_state(vcpu_sve_pffr(vcpu), + &vcpu->arch.ctxt.fp_regs.fpsr); + write_sysreg_el1(__vcpu_sys_reg(vcpu, ZCR_EL1), SYS_ZCR); +} + /* Check for an FPSIMD/SVE trap and handle as appropriate */ static inline bool __hyp_handle_fpsimd(struct kvm_vcpu *vcpu) { @@ -251,28 +269,18 @@ static inline bool __hyp_handle_fpsimd(struct kvm_vcpu *vcpu) * In the SVE case, VHE is assumed: it is enforced by * Kconfig and kvm_arch_init(). */ - if (sve_host) { - struct thread_struct *thread = container_of( - vcpu->arch.host_fpsimd_state, - struct thread_struct, uw.fpsimd_state); - - __sve_save_state(sve_pffr(thread), - &vcpu->arch.host_fpsimd_state->fpsr); - } else { + if (sve_host) + __hyp_sve_save_host(vcpu); + else __fpsimd_save_state(vcpu->arch.host_fpsimd_state); - } vcpu->arch.flags &= ~KVM_ARM64_FP_HOST; } - if (sve_guest) { - __sve_restore_state(vcpu_sve_pffr(vcpu), - &vcpu->arch.ctxt.fp_regs.fpsr, - vcpu_sve_vq(vcpu) - 1); - write_sysreg_el1(__vcpu_sys_reg(vcpu, ZCR_EL1), SYS_ZCR); - } else { + if (sve_guest) + __hyp_sve_restore_guest(vcpu); + else __fpsimd_restore_state(&vcpu->arch.ctxt.fp_regs); - } /* Skip restoring fpexc32 for AArch64 guests */ if (!(read_sysreg(hcr_el2) & HCR_RW)) -- 2.29.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel