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=-16.5 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_INVALID,DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS, 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 389C7C47083 for ; Wed, 2 Jun 2021 09:44:27 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id DD834613D6 for ; Wed, 2 Jun 2021 09:44:26 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DD834613D6 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvmarm-bounces@lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 8894640856; Wed, 2 Jun 2021 05:44:26 -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 kktI85v8e-gb; Wed, 2 Jun 2021 05:44:22 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id D85E44A32E; Wed, 2 Jun 2021 05:44:13 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id A6B0149FA6 for ; Wed, 2 Jun 2021 05:44:11 -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 eCKo2ZdDF0ix for ; Wed, 2 Jun 2021 05:44:09 -0400 (EDT) Received: from mail-qv1-f73.google.com (mail-qv1-f73.google.com [209.85.219.73]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 7F2B04A588 for ; Wed, 2 Jun 2021 05:44:02 -0400 (EDT) Received: by mail-qv1-f73.google.com with SMTP id bl11-20020ad4564b0000b029021d1fdffd5aso1307847qvb.1 for ; Wed, 02 Jun 2021 02:44:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=M5Wmq+shTVGIkdp11V4c5i7OM/twUXVfGwFeKTKgDek=; b=sbhoOROzzgBjQ0Ii5F3WE53vDNE2WQ9bNmdrgZu1xuJ9RSjfTkJSQQOFRCY5YBGWoq uLzfsCzlorbdo93AUkTG8w+9z/k/IQhlrlZzGIue7mROdwqxWwzpc4ACpqZ7TQrsr0nR HxhodZI0VmshsthL3HyVJ4Llw6dMvOEOg0orUkcuwgmexiBLsW5yMr32mgBpk/UXShq5 3VsQbZ/2UndcuRP5P5ctxfPvznXxJrBNlmX/yVf4mCCSAdHzRGM9Q7rijkRuyatj6zvf hU9a4s+ryYsqN1/rzuOaQGnMC6kXUcDFLbTJdWPGndOcXodaVXtrYT9fbb4sBsC1tai/ uwOA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=M5Wmq+shTVGIkdp11V4c5i7OM/twUXVfGwFeKTKgDek=; b=fkDhR/yqU4p3WAqHJNCB9zR9LbX+4H5qxHFJBOBbJM2ESNSWtByyasc0GBkoQOSw2o KQMc7Q2kELx86fshtS4xDP705wvTk8Ytc4kzQB0oXtQgr9w74V5FniX/5lRvB0DpwRYM 74OjZx9z/nFaEtoMiYsOcHNW7USTBuJowi/2Dg9xLnO1qcITnofeh81ICrmvl5mmsZuM KWh4iCR2e4v3vXCLBgIdzfqOmmG9OxuxOE502AGt+WGyKsB2DB0z0oWiv3LQVWIDGf0+ oG3pnFdyCv6TvgQgr8lx1Q+moq+os1/E2q0hR7qzGP6j7dQGPioElY9VIoqh4ByQQeVs JXiA== X-Gm-Message-State: AOAM5306DlfrDaqH+MkA/3VP2ZUFe6+QyPnAeZYaTht1UQImHieX/3Xp GKmeu/L9NDVIirqvCmCcgGxtLHZlw7sl X-Google-Smtp-Source: ABdhPJzlMLj9aWOGmgfcq4uAOufpXqkiQRCfhyfBHQEh7YCjqgQkiQm8f+4yZIS6dkEn/iv2Ws85pl+Yel5w X-Received: from r2d2-qp.c.googlers.com ([fda3:e722:ac3:cc00:28:9cb1:c0a8:1652]) (user=qperret job=sendgmr) by 2002:a05:6214:19c8:: with SMTP id j8mr27500174qvc.42.1622627042096; Wed, 02 Jun 2021 02:44:02 -0700 (PDT) Date: Wed, 2 Jun 2021 09:43:45 +0000 In-Reply-To: <20210602094347.3730846-1-qperret@google.com> Message-Id: <20210602094347.3730846-6-qperret@google.com> Mime-Version: 1.0 References: <20210602094347.3730846-1-qperret@google.com> X-Mailer: git-send-email 2.32.0.rc0.204.g9fa02ecfa5-goog Subject: [PATCH v2 5/7] KVM: arm64: Remove hyp_pool pointer from struct hyp_page From: Quentin Perret To: maz@kernel.org, will@kernel.org, james.morse@arm.com, alexandru.elisei@arm.com, catalin.marinas@arm.com, suzuki.poulose@arm.com 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 Each struct hyp_page currently contains a pointer to a hyp_pool struct where the page should be freed if its refcount reaches 0. However, this information can always be inferred from the context in the EL2 code, so drop the pointer to save a few bytes in the vmemmap. Signed-off-by: Quentin Perret --- arch/arm64/kvm/hyp/include/nvhe/gfp.h | 4 ++-- arch/arm64/kvm/hyp/include/nvhe/memory.h | 2 -- arch/arm64/kvm/hyp/nvhe/mem_protect.c | 14 ++++++++++++-- arch/arm64/kvm/hyp/nvhe/page_alloc.c | 7 ++----- arch/arm64/kvm/hyp/nvhe/setup.c | 14 ++++++++++++-- 5 files changed, 28 insertions(+), 13 deletions(-) diff --git a/arch/arm64/kvm/hyp/include/nvhe/gfp.h b/arch/arm64/kvm/hyp/include/nvhe/gfp.h index f2c84e4fa40f..3ea7bfb6c380 100644 --- a/arch/arm64/kvm/hyp/include/nvhe/gfp.h +++ b/arch/arm64/kvm/hyp/include/nvhe/gfp.h @@ -24,8 +24,8 @@ struct hyp_pool { /* Allocation */ void *hyp_alloc_pages(struct hyp_pool *pool, unsigned int order); -void hyp_get_page(void *addr); -void hyp_put_page(void *addr); +void hyp_get_page(struct hyp_pool *pool, void *addr); +void hyp_put_page(struct hyp_pool *pool, void *addr); /* Used pages cannot be freed */ int hyp_pool_init(struct hyp_pool *pool, u64 pfn, unsigned int nr_pages, diff --git a/arch/arm64/kvm/hyp/include/nvhe/memory.h b/arch/arm64/kvm/hyp/include/nvhe/memory.h index 7691ab495eb4..991636be2f46 100644 --- a/arch/arm64/kvm/hyp/include/nvhe/memory.h +++ b/arch/arm64/kvm/hyp/include/nvhe/memory.h @@ -7,11 +7,9 @@ #include -struct hyp_pool; struct hyp_page { unsigned int refcount; unsigned int order; - struct hyp_pool *pool; }; extern u64 __hyp_vmemmap; diff --git a/arch/arm64/kvm/hyp/nvhe/mem_protect.c b/arch/arm64/kvm/hyp/nvhe/mem_protect.c index fdd5b5702e8a..7727252890d8 100644 --- a/arch/arm64/kvm/hyp/nvhe/mem_protect.c +++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c @@ -43,6 +43,16 @@ static void *host_s2_zalloc_page(void *pool) return hyp_alloc_pages(pool, 0); } +static void host_s2_get_page(void *addr) +{ + hyp_get_page(&host_s2_pool, addr); +} + +static void host_s2_put_page(void *addr) +{ + hyp_put_page(&host_s2_pool, addr); +} + static int prepare_s2_pool(void *pgt_pool_base) { unsigned long nr_pages, pfn; @@ -60,8 +70,8 @@ static int prepare_s2_pool(void *pgt_pool_base) .phys_to_virt = hyp_phys_to_virt, .virt_to_phys = hyp_virt_to_phys, .page_count = hyp_page_count, - .get_page = hyp_get_page, - .put_page = hyp_put_page, + .get_page = host_s2_get_page, + .put_page = host_s2_put_page, }; return 0; diff --git a/arch/arm64/kvm/hyp/nvhe/page_alloc.c b/arch/arm64/kvm/hyp/nvhe/page_alloc.c index 34f0eb026dd2..e3689def7033 100644 --- a/arch/arm64/kvm/hyp/nvhe/page_alloc.c +++ b/arch/arm64/kvm/hyp/nvhe/page_alloc.c @@ -174,20 +174,18 @@ static void __hyp_put_page(struct hyp_pool *pool, struct hyp_page *p) * section to guarantee transient states (e.g. a page with null refcount but * not yet attached to a free list) can't be observed by well-behaved readers. */ -void hyp_put_page(void *addr) +void hyp_put_page(struct hyp_pool *pool, void *addr) { struct hyp_page *p = hyp_virt_to_page(addr); - struct hyp_pool *pool = hyp_page_to_pool(p); hyp_spin_lock(&pool->lock); __hyp_put_page(pool, p); hyp_spin_unlock(&pool->lock); } -void hyp_get_page(void *addr) +void hyp_get_page(struct hyp_pool *pool, void *addr) { struct hyp_page *p = hyp_virt_to_page(addr); - struct hyp_pool *pool = hyp_page_to_pool(p); hyp_spin_lock(&pool->lock); hyp_page_ref_inc(p); @@ -236,7 +234,6 @@ int hyp_pool_init(struct hyp_pool *pool, u64 pfn, unsigned int nr_pages, /* Init the vmemmap portion */ p = hyp_phys_to_page(phys); for (i = 0; i < nr_pages; i++) { - p[i].pool = pool; p[i].order = 0; hyp_set_page_refcounted(&p[i]); } diff --git a/arch/arm64/kvm/hyp/nvhe/setup.c b/arch/arm64/kvm/hyp/nvhe/setup.c index 709cb3d19eb7..dee099871865 100644 --- a/arch/arm64/kvm/hyp/nvhe/setup.c +++ b/arch/arm64/kvm/hyp/nvhe/setup.c @@ -137,6 +137,16 @@ static void *hyp_zalloc_hyp_page(void *arg) return hyp_alloc_pages(&hpool, 0); } +static void hpool_get_page(void *addr) +{ + hyp_get_page(&hpool, addr); +} + +static void hpool_put_page(void *addr) +{ + hyp_put_page(&hpool, addr); +} + void __noreturn __pkvm_init_finalise(void) { struct kvm_host_data *host_data = this_cpu_ptr(&kvm_host_data); @@ -160,8 +170,8 @@ void __noreturn __pkvm_init_finalise(void) .zalloc_page = hyp_zalloc_hyp_page, .phys_to_virt = hyp_phys_to_virt, .virt_to_phys = hyp_virt_to_phys, - .get_page = hyp_get_page, - .put_page = hyp_put_page, + .get_page = hpool_get_page, + .put_page = hpool_put_page, }; pkvm_pgtable.mm_ops = &pkvm_pgtable_mm_ops; -- 2.32.0.rc0.204.g9fa02ecfa5-goog _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm