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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A0813C433FE for ; Tue, 19 Oct 2021 12:13:19 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 545DB6135E for ; Tue, 19 Oct 2021 12:13:19 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 545DB6135E Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 082854B168; Tue, 19 Oct 2021 08:13:19 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Authentication-Results: mm01.cs.columbia.edu (amavisd-new); dkim=softfail (fail, message has been altered) header.i=@google.com 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 mXGf9iAXujWU; Tue, 19 Oct 2021 08:13:18 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id F35804B13A; Tue, 19 Oct 2021 08:13:16 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id BEEBB4B0D6 for ; Tue, 19 Oct 2021 08:13:15 -0400 (EDT) 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 KfJQly7WIhag for ; Tue, 19 Oct 2021 08:13:14 -0400 (EDT) Received: from mail-wr1-f74.google.com (mail-wr1-f74.google.com [209.85.221.74]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id AD0F14AC78 for ; Tue, 19 Oct 2021 08:13:14 -0400 (EDT) Received: by mail-wr1-f74.google.com with SMTP id j12-20020adf910c000000b0015e4260febdso3089598wrj.20 for ; Tue, 19 Oct 2021 05:13:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=TYk1LPnI99k/ggVKO8Mj9uEvzzDQ3GdDPOmXLwpCDNI=; b=O8yTSrO0Uca5wm5K4vU0ejt4H7paio27+Bqs4+KFIFEGBAiFkCCrrUrGNwkEt/Fefe 28wzo1Ssyx+9lQZLUUAw2vVund8vhlY/9UwK8rovsHyNg4yw2Rn3gBGVepSL7Eq2w3yF hOEEM+UMiw4N/19fDLtDtMDjzcuOLCQZrQwnn8kjya9y0T0dnD7uEF3AAv8UWU/4yrKi S6OImPM+oD/vG3KMqhrA+Gyqt8kAYJpzoj+A1WyLb90HutKsJMU8ddw6cAouTDJTBNKC PQvZvate6zTr45VFMsJe5Czj+08pSBtCAh4K0m25lr/XPX0osBrElQ5U3Cd9eTV8m49b ZmUw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=TYk1LPnI99k/ggVKO8Mj9uEvzzDQ3GdDPOmXLwpCDNI=; b=V+CqQPzJySMfdj56CAnktcLHsDKl+BcjClXGHjDFRHixaRJ8KNUxGQ9B7l3BRdVosT VrrVePk1PbDGEzwxWZluDh60A+VPKnTjnJTIVdLkkqBwFKbUqpxhtWjNl0mqw+dsXy/N 1Ityi4EvsprbiG30KtO6Z0l4uuJ8axiPsuTgvGC59bFdvFmEBfOBGDtzbpZSYqELUwC5 PnSG0b1eaLCt8zVsQCrSNxNMFZ7YYF2B18wksrFC/+3XHsG8oq0xpWEtMa9fPmfnL3/H OaZQC/0mm4Bgfj1lCJLwG7k893+zJEDDpmrM19q59IowhUjv4mxxX0wHZkckjCcjuZjv bLig== X-Gm-Message-State: AOAM532MXoXKWSScjDW0D7svtCcoGv0jqDjEs+Z1yK4DqQUN+uXQ+s8M Np/oPQqLf+1vT0BKuoukPJ8XPqbahALp X-Google-Smtp-Source: ABdhPJzFSw1s7wfnFX8qmHfRSKmq59QIp1f27cUPH/WdPiT9CqXbF6yjtS78WRcCH6lpSA4IMEtzt5LuNzVT X-Received: from luke.lon.corp.google.com ([2a00:79e0:d:210:59ca:401f:83a8:de6d]) (user=qperret job=sendgmr) by 2002:a1c:2b04:: with SMTP id r4mr5781071wmr.48.1634645593915; Tue, 19 Oct 2021 05:13:13 -0700 (PDT) Date: Tue, 19 Oct 2021 13:12:52 +0100 In-Reply-To: <20211019121304.2732332-1-qperret@google.com> Message-Id: <20211019121304.2732332-4-qperret@google.com> Mime-Version: 1.0 References: <20211019121304.2732332-1-qperret@google.com> X-Mailer: git-send-email 2.33.0.1079.g6e70778dc9-goog Subject: [PATCH v2 03/15] KVM: arm64: Refcount hyp stage-1 pgtable pages From: Quentin Perret To: Marc Zyngier , James Morse , Alexandru Elisei , Suzuki K Poulose , Catalin Marinas , Will Deacon , Fuad Tabba , David Brazdil , Andrew Walbran Cc: kernel-team@android.com, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org 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 To prepare the ground for allowing hyp stage-1 mappings to be removed at run-time, update the KVM page-table code to maintain a correct refcount using the ->{get,put}_page() function callbacks. Signed-off-by: Quentin Perret --- arch/arm64/kvm/hyp/pgtable.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c index f8ceebe4982e..768a58835153 100644 --- a/arch/arm64/kvm/hyp/pgtable.c +++ b/arch/arm64/kvm/hyp/pgtable.c @@ -408,8 +408,10 @@ static bool hyp_map_walker_try_leaf(u64 addr, u64 end, u32 level, return false; new = kvm_init_valid_leaf_pte(phys, data->attr, level); - if (hyp_pte_needs_update(old, new)) + if (hyp_pte_needs_update(old, new)) { smp_store_release(ptep, new); + data->mm_ops->get_page(ptep); + } data->phys += granule; return true; @@ -433,6 +435,7 @@ static int hyp_map_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep, return -ENOMEM; kvm_set_table_pte(ptep, childp, mm_ops); + mm_ops->get_page(ptep); return 0; } @@ -482,8 +485,16 @@ static int hyp_free_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep, enum kvm_pgtable_walk_flags flag, void * const arg) { struct kvm_pgtable_mm_ops *mm_ops = arg; + kvm_pte_t pte = *ptep; + + if (!kvm_pte_valid(pte)) + return 0; + + mm_ops->put_page(ptep); + + if (kvm_pte_table(pte, level)) + mm_ops->put_page(kvm_pte_follow(pte, mm_ops)); - mm_ops->put_page((void *)kvm_pte_follow(*ptep, mm_ops)); return 0; } @@ -491,7 +502,7 @@ void kvm_pgtable_hyp_destroy(struct kvm_pgtable *pgt) { struct kvm_pgtable_walker walker = { .cb = hyp_free_walker, - .flags = KVM_PGTABLE_WALK_TABLE_POST, + .flags = KVM_PGTABLE_WALK_LEAF | KVM_PGTABLE_WALK_TABLE_POST, .arg = pgt->mm_ops, }; -- 2.33.0.1079.g6e70778dc9-goog _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm