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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7A67EC38A2D for ; Tue, 25 Oct 2022 14:52:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231909AbiJYOw3 (ORCPT ); Tue, 25 Oct 2022 10:52:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56256 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233011AbiJYOwI (ORCPT ); Tue, 25 Oct 2022 10:52:08 -0400 Received: from mail-ed1-x549.google.com (mail-ed1-x549.google.com [IPv6:2a00:1450:4864:20::549]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B394719E01F for ; Tue, 25 Oct 2022 07:52:06 -0700 (PDT) Received: by mail-ed1-x549.google.com with SMTP id c9-20020a05640227c900b0045d4a88c750so11958092ede.12 for ; Tue, 25 Oct 2022 07:52:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=iW7y1fLgpkJui3hvQxzLoNSX4KE+fgXa0IU1VCGorq8=; b=qJakZ6WY7j9J9m8Y0t0mKscdKtWoQFQZx/SlIwtmdVidxM8A5xf050QT9Ki74jQrL1 I1jtlS5bPffVifc9+0ncXh2wwwFOzVaq6063eYqf/v/Pl2+CjzJRqU13Oz7kC4XO9shq rk7e1jP74dU+C6IgUOoa4PVz3g4RhXXyTqm6wsiEhNC7ZVMmHNQhgmULb6ksYf93T5Pq Hz1ccacdzLT7No3GpTOIBgRj9eUiZYuKalDOV91XpIhsNHChn2V7IF28NwUwvxVpR7ps 7iqals/Wlf90wOzqbZc+9XGB9AKrzHp5iU5dKE+mCdqT+LlsVAHopgFQJUCQmhrKOdkS ENcA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=iW7y1fLgpkJui3hvQxzLoNSX4KE+fgXa0IU1VCGorq8=; b=TyxYtKzsodw0KpfWXV6VTULRHGKlxTO7M2hc9j2ucSkJbJ/ibPlFyRI/+4313B0TIU cAT8tne7kSZt8C4XelxQMNr4Uke9I+O45kK8rWpvOj9fOawjLj1Dx/Lknwz2itHvtbMD oUA86V7bgmSGiSXl9RFNwLzKnjb5vHEKBL+oe8TQU7x7LoghGMoG/du0fI/xC76h4j9n g1UDsSSbzwr7EpUUcro0t/Jrv+4Npd3+WJN1XgZt+6QTMDywoFxgeWLRaUf4R2HkBpjY TbS2F2pG81s+8/y7m3hUPXKQSJ9rQ5gBU822WW/lMN+xYoqmAYkn1g84nn5jMIqPLTju sBUA== X-Gm-Message-State: ACrzQf2VrxRkiyZ3q9ZtX7xVV0hjmV6dUqRe9ECu/pSr0TYi6UtkRgMk 3wweJvvjqZtsaL83gNcM/gy3YczytpXY X-Google-Smtp-Source: AMsMyM4BGDxK+RsryB8gWtAc8z+lfBDtIE7P/25DUQWrqxjJtocSP2UPxVASx3qt+ngO9qDF5OIYpYiVN++A X-Received: from big-boi.c.googlers.com ([fda3:e722:ac3:cc00:31:98fb:c0a8:129]) (user=qperret job=sendgmr) by 2002:a05:6402:d06:b0:45a:3ac6:ad26 with SMTP id eb6-20020a0564020d0600b0045a3ac6ad26mr36497510edb.195.1666709525134; Tue, 25 Oct 2022 07:52:05 -0700 (PDT) Date: Tue, 25 Oct 2022 14:51:56 +0000 Mime-Version: 1.0 X-Mailer: git-send-email 2.38.0.135.g90850a2211-goog Message-ID: <20221025145156.855308-1-qperret@google.com> Subject: [PATCH] KVM: arm64: Use correct accessor to parse stage-1 PTEs From: Quentin Perret To: Marc Zyngier , James Morse , Alexandru Elisei , Suzuki K Poulose , Oliver Upton , Catalin Marinas , Will Deacon Cc: Quentin Perret , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org hyp_get_page_state() is used with pKVM to retrieve metadata about a page by parsing a hypervisor stage-1 PTE. However, it incorrectly uses a helper which parses *stage-2* mappings. Ouch. Luckily, pkvm_getstate() only looks at the software bits, which happen to be in the same place for stage-1 and stage-2 PTEs, and this all ends up working correctly by accident. But clearly, we should do better. Fix hyp_get_page_state() to use the correct helper. Fixes: e82edcc75c4e ("KVM: arm64: Implement do_share() helper for sharing memory") Signed-off-by: Quentin Perret --- arch/arm64/kvm/hyp/nvhe/mem_protect.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/kvm/hyp/nvhe/mem_protect.c b/arch/arm64/kvm/hyp/nvhe/mem_protect.c index 1e78acf9662e..07f9dc9848ef 100644 --- a/arch/arm64/kvm/hyp/nvhe/mem_protect.c +++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c @@ -516,7 +516,7 @@ static enum pkvm_page_state hyp_get_page_state(kvm_pte_t pte) if (!kvm_pte_valid(pte)) return PKVM_NOPAGE; - return pkvm_getstate(kvm_pgtable_stage2_pte_prot(pte)); + return pkvm_getstate(kvm_pgtable_hyp_pte_prot(pte)); } static int __hyp_check_page_state_range(u64 addr, u64 size, -- 2.38.0.135.g90850a2211-goog