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_PATCH,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, 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 37945C433E0 for ; Thu, 18 Mar 2021 12:27:24 +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 ACB0B64F4D for ; Thu, 18 Mar 2021 12:27:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org ACB0B64F4D 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: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:In-Reply-To:References:List-Owner; bh=5VvBxV5C0+pfkZUShoJVRF4Fot1ZyXMaeWV2B2w2yxs=; b=rOf34I5SPqZr/Keaij2OyHdpjI dupIBcI7Uf3ZRH2+zkJBSit/fXnx+Mq/hwdAnNRvsOw+XF7WcB3fSbd9QO19X/XKwwh2vseLWiuiW MdfSU1jJJ+6WqLTstlBqSyY1KQQJNYFX4go0jfp2oqfEcu91QxjvGqTnBk1Kjkq7urIyf72JQWG8V 7pX/okclTn4nfVJClEje6nUdWOzdIBsWBA0IKAqANIWwoaVTxo1O/Q7LDBf09oAjktWDBwecHdNQ6 1POi4UunC4aZJJwwwzk/4h1jQlYAG93EdnEmo2MqYQD63w8bWYb7dlIDx0MffnB80vl74TcHU5uZG gKiKb38g==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lMriq-005BvH-Qw; Thu, 18 Mar 2021 12:25:53 +0000 Received: from mail.kernel.org ([198.145.29.99]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lMrik-005BtP-PE for linux-arm-kernel@lists.infradead.org; Thu, 18 Mar 2021 12:25:49 +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 0741D64F41; Thu, 18 Mar 2021 12:25:45 +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 1lMrig-002OZW-QY; Thu, 18 Mar 2021 12:25:42 +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 00/11] KVM: arm64: Enable SVE support on nVHE systems Date: Thu, 18 Mar 2021 12:25:21 +0000 Message-Id: <20210318122532.505263-1-maz@kernel.org> X-Mailer: git-send-email 2.29.2 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_122547_365299_EA597C97 X-CRM114-Status: GOOD ( 17.20 ) 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 This series enables SVE support for KVM on nVHE hardware (or more likely, software models), and is an alternative to Daniel's patch[1] which has gone through 3 versions, but still has a number of issues. Instead of waiting for things to happen, I decided to try and see what I could come up with. The SVE save/restore is modelled after the SVE VHE flow, itself closely following the FPSIMD flow: - the guest traps to EL2 on first SVE access, and will not trap anymore until vcpu_put() - ZCR_EL2 stays constant as long as the guest has SVE enabled - once back on the host side, ZCR_EL2 is restored to its default value on first SVE access Most of this series only repaints things so that VHE and nVHE look as similar as possible, the ZCR_EL2 management being the most visible exception. This results in a bunch of preparatory patches that aim at making the code slightly more readable. This has been tested on a FVP model with both VHE/nVHE configurations using the string tests included with the "optimized-routines" library[2]. Patches against 5.12-rc2. * From v1 [3]: - Fixed __sve_save_state SYM_FUNC_END label - Turned the ZCR_EL2 reset hypercall into a host trap - Fixed SVE state mapping size - Correctly mask RES0 bits from ZCR_ELx - Introduced sve_cond_update_zcr_vq() as a ZCR_ELx update helper - Renamed vcpu_sve_vq() to vcpu_sve_max_vq() - Collected Acks from Will [1] https://lore.kernel.org/r/20210302164850.3553701-1-daniel.kiss@arm.com [2] https://github.com/ARM-software/optimized-routines [3] https://lore.kernel.org/r/20210316101312.102925-1-maz@kernel.org Daniel Kiss (1): KVM: arm64: Enable SVE support for nVHE Marc Zyngier (10): KVM: arm64: Provide KVM's own save/restore SVE primitives KVM: arm64: Use {read,write}_sysreg_el1 to access ZCR_EL1 KVM: arm64: Let vcpu_sve_pffr() handle HYP VAs KVM: arm64: Introduce vcpu_sve_vq() helper arm64: sve: Provide a conditional update accessor for ZCR_ELx KVM: arm64: Rework SVE host-save/guest-restore KVM: arm64: Map SVE context at EL2 when available KVM: arm64: Save guest's ZCR_EL1 before saving the FPSIMD state KVM: arm64: Trap host SVE accesses when the FPSIMD state is dirty KVM: arm64: Save/restore SVE state for nVHE arch/arm64/Kconfig | 7 --- arch/arm64/include/asm/fpsimd.h | 9 +++ arch/arm64/include/asm/fpsimdmacros.h | 10 +++- arch/arm64/include/asm/kvm_host.h | 21 ++----- arch/arm64/include/asm/kvm_hyp.h | 2 + arch/arm64/kvm/arm.c | 5 -- arch/arm64/kvm/fpsimd.c | 26 +++++++-- arch/arm64/kvm/guest.c | 6 +- arch/arm64/kvm/hyp/fpsimd.S | 10 ++++ arch/arm64/kvm/hyp/include/hyp/switch.h | 77 ++++++++++++------------- arch/arm64/kvm/hyp/nvhe/hyp-main.c | 4 ++ arch/arm64/kvm/hyp/nvhe/switch.c | 13 +++-- arch/arm64/kvm/reset.c | 4 -- 13 files changed, 109 insertions(+), 85 deletions(-) -- 2.29.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel