From nobody Thu Apr 9 06:23:18 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EBA46C4332F for ; Thu, 3 Nov 2022 05:33:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230305AbiKCFd1 (ORCPT ); Thu, 3 Nov 2022 01:33:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58508 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229436AbiKCFdY (ORCPT ); Thu, 3 Nov 2022 01:33:24 -0400 Received: from mail-pf1-x42f.google.com (mail-pf1-x42f.google.com [IPv6:2607:f8b0:4864:20::42f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9B27118B37 for ; Wed, 2 Nov 2022 22:33:18 -0700 (PDT) Received: by mail-pf1-x42f.google.com with SMTP id m6so726252pfb.0 for ; Wed, 02 Nov 2022 22:33:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=csie-ntu-edu-tw.20210112.gappssmtp.com; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=Y0jwfzDPpiiIA6G13h9XyMG8TS+aWs3VsgaKFJG4r/Y=; b=mxroxZXUMUkz4XhlkDgs8s8+7XrSh7WWJTclkV3qQTHFYNn2rr7B1rVc7FQ1vwg5rd aeNnyDeufwx5om4LYQWB4eKUVZgU8A1BQSFYQ2aV9ergBjzRyamSGf7rr+4IudJT50tt FcdfRX2xMd8Iy1p5KKi88ezGSZmzUzHdxpfAIGWws5w0Yej4kOFaki8PnHwh1PtwhBsS Ob3p5kbpMuqjL5VdPdOtzazOwqx4gJSiup/Lj2Y+8DC+UvJMICJsmTnQtamiMSDhJa33 Jjfl97tazJ5vGcIPXll1dcMTjCD/02gBAxRz+HTn7Rb6TO+K7zCEGdHiAufdXzkP+ENJ 9AHg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=Y0jwfzDPpiiIA6G13h9XyMG8TS+aWs3VsgaKFJG4r/Y=; b=E/5s5auBMuJh7EqdQ44EBeWz9MXdc5X81dfkw/wPr4oQGZKSJmmEPFI0cwwG6KZWNO wfRp2spvhdE7DD88ELiXa5ASnIkU8CmSEHufhWGbXkoRTrMa/1OGzwmvgWXhEHRkqYbt sBDmsiNZadUVoBzgbkTcaVcrVETSpF9nzExV9JT6uQfcIQQj65/Fn5KHEQpdNmHw09Wc 7odQUv5Lj82OlAry/WQE7HON0cJsK7Tsx2DthQEOONIPuMvgiCtxBJ+JZsvIEM66ra9b EwxYX91uTQA/oZ/7CtB9lVB1W2Y9DgtGHtdHeDGzBadIGaV+ymzQpboMZniz1oN45y63 lNNg== X-Gm-Message-State: ACrzQf0pdjFH3dpZ/8/V4J2JsjOlMzhZlIcX0j/arxLTHV8kgk4srikR vuvbrfXYjCap8K7SO1bz852KV7XReKYfvlOzdXYezKV5AZ0hwVRwcQ131KLx76sOp3ZM9TJtwAr odgGK+spVLkRAAzbzMM/lTuJYp2FAZQ228XTWnu/Pil+p5dAijAYWnOnk5Dd+LeYL0EX1JS16ud PHZDucFpXXTJ0jPHl1r9+lKifXO3E= X-Google-Smtp-Source: AMsMyM5YD3Kv+bRTItC2EnabSgqHnEdgAworw+tKJ/WaqkqybiIf2VNdq72dJjo7lmn9TaCyghDjcg== X-Received: by 2002:a63:6909:0:b0:41c:9f4f:a63c with SMTP id e9-20020a636909000000b0041c9f4fa63cmr25661260pgc.76.1667453597997; Wed, 02 Nov 2022 22:33:17 -0700 (PDT) Received: from localhost.localdomain (2001-b011-3803-1d6f-4606-a53e-f8a5-75e1.dynamic-ip6.hinet.net. [2001:b011:3803:1d6f:4606:a53e:f8a5:75e1]) by smtp.gmail.com with ESMTPSA id n17-20020a17090ac69100b00212d4cbcbfdsm67368pjt.22.2022.11.02.22.33.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Nov 2022 22:33:16 -0700 (PDT) From: Wei-Lin Chang To: maz@kernel.org Cc: james.morse@arm.com, alexandru.elisei@arm.com, suzuki.poulose@arm.com, oliver.upton@linux.dev, catalin.marinas@arm.com, will@kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, Wei-Lin Chang Subject: [PATCH] KVM: arm64: Update comment of create_hyp_mappings Date: Thu, 3 Nov 2022 13:32:28 +0800 Message-Id: <20221103053228.961591-1-r09922117@csie.ntu.edu.tw> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Gm-Spam: 0 X-Gm-Phishy: 0 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" HYP_PAGE_OFFSET is removed since 4.8, and the method for generating Hyp VAs has evolved. Update the functional description of create_hyp_mappings accordingly. Signed-off-by: Wei-Lin Chang --- arch/arm64/kvm/mmu.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index c9a13e487..a9ae4a3f9 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -424,9 +424,10 @@ void kvm_unshare_hyp(void *from, void *to) * @to: The virtual kernel end address of the range (exclusive) * @prot: The protection to be applied to this range * - * The same virtual address as the kernel virtual address is also used - * in Hyp-mode mapping (modulo HYP_PAGE_OFFSET) to the same underlying - * physical pages. + * The Hyp virtual address is generated by masking the kernel VA with + * va_mask then inserting tag_val for the higher bits starting from + * tag_lsb. See kvm_compute_layout() in va_layout.c for more info. + * Both Hyp VA and kernel VA ranges map to the same underlying physical pa= ges. */ int create_hyp_mappings(void *from, void *to, enum kvm_pgtable_prot prot) { --=20 2.34.1