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=-12.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 5FDD9C4727F for ; Wed, 30 Sep 2020 13:18:17 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id B906D20754 for ; Wed, 30 Sep 2020 13:18:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="FRkIUsbx" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B906D20754 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org 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 2FBDA4B34D; Wed, 30 Sep 2020 09:18:16 -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=@kernel.org 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 jyzPM3107n4V; Wed, 30 Sep 2020 09:18:13 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 52FE74B3C0; Wed, 30 Sep 2020 09:18:13 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id EBC6C4B3BF for ; Wed, 30 Sep 2020 09:18:11 -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 JVEauMQCfueb for ; Wed, 30 Sep 2020 09:18:10 -0400 (EDT) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 93A184B1F4 for ; Wed, 30 Sep 2020 09:18:10 -0400 (EDT) Received: from localhost.localdomain (236.31.169.217.in-addr.arpa [217.169.31.236]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 936B820759; Wed, 30 Sep 2020 13:18:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1601471889; bh=eV9YjZWTVz7EkNXDbZ/gHTeJH+pvOx9D/KMbXvkJyDk=; h=From:To:Cc:Subject:Date:From; b=FRkIUsbxSrEX/91T/MPotlTkrZsW0SM9JsvxkLcOJzc37dic5iRBK7Uj65andj9WP IkTfmPTvkmeqI+vLWfcXGNAnNDjLI4JY95CQwc4iAKyQgM/Z2JFrqPPjvUFNAy0vzx YMJkbAgjml6EG+WnQy3rpab4IJPinM8ooHe+Tanc= From: Will Deacon To: kvmarm@lists.cs.columbia.edu Subject: [PATCH] KVM: arm64: Pass level hint to TLBI during stage-2 permission fault Date: Wed, 30 Sep 2020 14:18:01 +0100 Message-Id: <20200930131801.16889-1-will@kernel.org> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Cc: Will Deacon , kernel-team@android.com, Marc Zyngier 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 Alex pointed out that we don't pass a level hint to the TLBI instruction when handling a stage-2 permission fault, even though the walker does at some point have the level information in its hands. Rework stage2_update_leaf_attrs() so that it can optionally return the level of the updated pte to its caller, which can in turn be used to provide the correct TLBI level hint. Cc: Marc Zyngier Link: https://lore.kernel.org/r/595cc73e-636e-8b3a-f93a-b4e9fb218db8@arm.com Reported-by: Alexandru Elisei Signed-off-by: Will Deacon --- arch/arm64/kvm/hyp/pgtable.c | 23 ++++++++++++++++------- 1 file changed, 16 insertions(+), 7 deletions(-) diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c index 603d6b415337..0cdf6e461cbd 100644 --- a/arch/arm64/kvm/hyp/pgtable.c +++ b/arch/arm64/kvm/hyp/pgtable.c @@ -694,6 +694,7 @@ struct stage2_attr_data { kvm_pte_t attr_set; kvm_pte_t attr_clr; kvm_pte_t pte; + u32 level; }; static int stage2_attr_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep, @@ -706,6 +707,7 @@ static int stage2_attr_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep, if (!kvm_pte_valid(pte)) return 0; + data->level = level; data->pte = pte; pte &= ~data->attr_clr; pte |= data->attr_set; @@ -723,7 +725,8 @@ static int stage2_attr_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep, static int stage2_update_leaf_attrs(struct kvm_pgtable *pgt, u64 addr, u64 size, kvm_pte_t attr_set, - kvm_pte_t attr_clr, kvm_pte_t *orig_pte) + kvm_pte_t attr_clr, kvm_pte_t *orig_pte, + u32 *level) { int ret; kvm_pte_t attr_mask = KVM_PTE_LEAF_ATTR_LO | KVM_PTE_LEAF_ATTR_HI; @@ -743,20 +746,24 @@ static int stage2_update_leaf_attrs(struct kvm_pgtable *pgt, u64 addr, if (orig_pte) *orig_pte = data.pte; + + if (level) + *level = data.level; return 0; } int kvm_pgtable_stage2_wrprotect(struct kvm_pgtable *pgt, u64 addr, u64 size) { return stage2_update_leaf_attrs(pgt, addr, size, 0, - KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W, NULL); + KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W, + NULL, NULL); } kvm_pte_t kvm_pgtable_stage2_mkyoung(struct kvm_pgtable *pgt, u64 addr) { kvm_pte_t pte = 0; stage2_update_leaf_attrs(pgt, addr, 1, KVM_PTE_LEAF_ATTR_LO_S2_AF, 0, - &pte); + &pte, NULL); dsb(ishst); return pte; } @@ -765,7 +772,7 @@ kvm_pte_t kvm_pgtable_stage2_mkold(struct kvm_pgtable *pgt, u64 addr) { kvm_pte_t pte = 0; stage2_update_leaf_attrs(pgt, addr, 1, 0, KVM_PTE_LEAF_ATTR_LO_S2_AF, - &pte); + &pte, NULL); /* * "But where's the TLBI?!", you scream. * "Over in the core code", I sigh. @@ -778,7 +785,7 @@ kvm_pte_t kvm_pgtable_stage2_mkold(struct kvm_pgtable *pgt, u64 addr) bool kvm_pgtable_stage2_is_young(struct kvm_pgtable *pgt, u64 addr) { kvm_pte_t pte = 0; - stage2_update_leaf_attrs(pgt, addr, 1, 0, 0, &pte); + stage2_update_leaf_attrs(pgt, addr, 1, 0, 0, &pte, NULL); return pte & KVM_PTE_LEAF_ATTR_LO_S2_AF; } @@ -786,6 +793,7 @@ int kvm_pgtable_stage2_relax_perms(struct kvm_pgtable *pgt, u64 addr, enum kvm_pgtable_prot prot) { int ret; + u32 level; kvm_pte_t set = 0, clr = 0; if (prot & KVM_PGTABLE_PROT_R) @@ -797,8 +805,9 @@ int kvm_pgtable_stage2_relax_perms(struct kvm_pgtable *pgt, u64 addr, if (prot & KVM_PGTABLE_PROT_X) clr |= KVM_PTE_LEAF_ATTR_HI_S2_XN; - ret = stage2_update_leaf_attrs(pgt, addr, 1, set, clr, NULL); - kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, pgt->mmu, addr, 0); + ret = stage2_update_leaf_attrs(pgt, addr, 1, set, clr, NULL, &level); + if (!ret) + kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, pgt->mmu, addr, level); return ret; } -- 2.28.0.709.gb0816b6eb0-goog _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm