From patchwork Mon May 10 16:59:07 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 12248947 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=-14.2 required=3.0 tests=BAYES_00,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, UNWANTED_LANGUAGE_BODY,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 0543EC43460 for ; Mon, 10 May 2021 17:27:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DCDF161494 for ; Mon, 10 May 2021 17:27:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232904AbhEJR24 (ORCPT ); Mon, 10 May 2021 13:28:56 -0400 Received: from mail.kernel.org ([198.145.29.99]:53290 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232910AbhEJR2o (ORCPT ); Mon, 10 May 2021 13:28:44 -0400 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 9CE716147F; Mon, 10 May 2021 17:27:39 +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 4.94.2) (envelope-from ) id 1lg9Gj-000Uqg-LL; Mon, 10 May 2021 18:00:33 +0100 From: Marc Zyngier To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Cc: Andre Przywara , Christoffer Dall , Jintack Lim , Haibo Xu , James Morse , Suzuki K Poulose , Alexandru Elisei , kernel-team@android.com Subject: [PATCH v4 53/66] KVM: arm64: nv: Add handling of ARMv8.4-TTL TLB invalidation Date: Mon, 10 May 2021 17:59:07 +0100 Message-Id: <20210510165920.1913477-54-maz@kernel.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210510165920.1913477-1-maz@kernel.org> References: <20210510165920.1913477-1-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, haibo.xu@linaro.org, james.morse@arm.com, suzuki.poulose@arm.com, alexandru.elisei@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 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Support guest-provided information information to find out about the range of required invalidation. Signed-off-by: Marc Zyngier --- arch/arm64/include/asm/kvm_nested.h | 1 + arch/arm64/kvm/nested.c | 57 +++++++++++++++++++++ arch/arm64/kvm/sys_regs.c | 78 ++++++++++++++++++----------- 3 files changed, 108 insertions(+), 28 deletions(-) diff --git a/arch/arm64/include/asm/kvm_nested.h b/arch/arm64/include/asm/kvm_nested.h index 5fa3c634c8e1..7c47ad655e2e 100644 --- a/arch/arm64/include/asm/kvm_nested.h +++ b/arch/arm64/include/asm/kvm_nested.h @@ -123,6 +123,7 @@ extern bool __forward_traps(struct kvm_vcpu *vcpu, unsigned int reg, u64 control_bit); extern bool forward_traps(struct kvm_vcpu *vcpu, u64 control_bit); extern bool forward_nv_traps(struct kvm_vcpu *vcpu); +unsigned int ttl_to_size(u8 ttl); struct sys_reg_params; struct sys_reg_desc; diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c index ecbfaf3a43cf..94d3011bcdd2 100644 --- a/arch/arm64/kvm/nested.c +++ b/arch/arm64/kvm/nested.c @@ -351,6 +351,63 @@ int kvm_walk_nested_s2(struct kvm_vcpu *vcpu, phys_addr_t gipa, return ret; } + +unsigned int ttl_to_size(u8 ttl) +{ + int level = ttl & 3; + int gran = (ttl >> 2) & 3; + unsigned int max_size = 0; + + switch (gran) { + case TLBI_TTL_TG_4K: + switch (level) { + case 0: + break; + case 1: + max_size = SZ_1G; + break; + case 2: + max_size = SZ_2M; + break; + case 3: + max_size = SZ_4K; + break; + } + break; + case TLBI_TTL_TG_16K: + switch (level) { + case 0: + case 1: + break; + case 2: + max_size = SZ_32M; + break; + case 3: + max_size = SZ_16K; + break; + } + break; + case TLBI_TTL_TG_64K: + switch (level) { + case 0: + case 1: + /* No 52bit IPA support */ + break; + case 2: + max_size = SZ_512M; + break; + case 3: + max_size = SZ_64K; + break; + } + break; + default: /* No size information */ + break; + } + + return max_size; +} + /* Must be called with kvm->lock held */ struct kvm_s2_mmu *lookup_s2_mmu(struct kvm *kvm, u64 vttbr, u64 hcr) { diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 90dace973d8f..4374962d43ff 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -2616,59 +2616,81 @@ static bool handle_vmalls12e1is(struct kvm_vcpu *vcpu, struct sys_reg_params *p, return true; } +static unsigned long compute_tlb_inval_range(struct kvm_vcpu *vcpu, + struct kvm_s2_mmu *mmu, + u64 val) +{ + unsigned long max_size; + u8 ttl = 0; + + if (cpus_have_const_cap(ARM64_HAS_ARMv8_4_TTL)) { + ttl = FIELD_GET(GENMASK_ULL(47, 44), val); + } + + max_size = ttl_to_size(ttl); + + if (!max_size) { + u64 vtcr = vcpu_read_sys_reg(vcpu, VTCR_EL2); + + /* Compute the maximum extent of the invalidation */ + switch ((vtcr & VTCR_EL2_TG0_MASK)) { + case VTCR_EL2_TG0_4K: + max_size = SZ_1G; + break; + case VTCR_EL2_TG0_16K: + max_size = SZ_32M; + break; + case VTCR_EL2_TG0_64K: + /* + * No, we do not support 52bit IPA in nested yet. Once + * we do, this should be 4TB. + */ + /* FIXME: remove the 52bit PA support from the IDregs */ + max_size = SZ_512M; + break; + default: + BUG(); + } + } + + WARN_ON(!max_size); + return max_size; +} + static bool handle_ipas2e1is(struct kvm_vcpu *vcpu, struct sys_reg_params *p, const struct sys_reg_desc *r) { u64 vttbr = vcpu_read_sys_reg(vcpu, VTTBR_EL2); - u64 vtcr = vcpu_read_sys_reg(vcpu, VTCR_EL2); struct kvm_s2_mmu *mmu; u64 base_addr; - int max_size; + unsigned long max_size; /* * We drop a number of things from the supplied value: * * - NS bit: we're non-secure only. * - * - TTL field: We already have the granule size from the - * VTCR_EL2.TG0 field, and the level is only relevant to the - * guest's S2PT. - * * - IPA[51:48]: We don't support 52bit IPA just yet... * * And of course, adjust the IPA to be on an actual address. */ base_addr = (p->regval & GENMASK_ULL(35, 0)) << 12; - /* Compute the maximum extent of the invalidation */ - switch ((vtcr & VTCR_EL2_TG0_MASK)) { - case VTCR_EL2_TG0_4K: - max_size = SZ_1G; - break; - case VTCR_EL2_TG0_16K: - max_size = SZ_32M; - break; - case VTCR_EL2_TG0_64K: - /* - * No, we do not support 52bit IPA in nested yet. Once - * we do, this should be 4TB. - */ - /* FIXME: remove the 52bit PA support from the IDregs */ - max_size = SZ_512M; - break; - default: - BUG(); - } - spin_lock(&vcpu->kvm->mmu_lock); mmu = lookup_s2_mmu(vcpu->kvm, vttbr, HCR_VM); - if (mmu) + if (mmu) { + max_size = compute_tlb_inval_range(vcpu, mmu, p->regval); + base_addr &= ~(max_size - 1); kvm_unmap_stage2_range(mmu, base_addr, max_size); + } mmu = lookup_s2_mmu(vcpu->kvm, vttbr, 0); - if (mmu) + if (mmu) { + max_size = compute_tlb_inval_range(vcpu, mmu, p->regval); + base_addr &= ~(max_size - 1); kvm_unmap_stage2_range(mmu, base_addr, max_size); + } spin_unlock(&vcpu->kvm->mmu_lock);