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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 247DEC79F9D for ; Mon, 5 Jan 2026 15:50:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=9Bh74ffhwGvzoB32j6548UJ2jmofNRBk5TExayO2sC0=; b=zHy8bwxtK78io7YjwPa5LWrnSd d9bd0U9Hq4ThrqP7xzqRYmFB24FId4oJ5zVss2A2sw2XeiwBU57wwLcWKkMQjVSmSf5cQ5u1MKM/+ /sGHsV6C8OGUatfEGRVtzitxt+x6ObOmXQGBKPkswcPMxxEooZXbVnQ1tayr1CFfDzjEHFSU9U8R/ Ug8/65ER7zPEBYrStneR9l4Z6GBjiIxOxJaF+M1P7h7R2mPX/rqOZKWmYSGUalft4SY7Pglz2tGNH 91efopu3XsoSffby6lZDg3K8Hr2kLi0P6UdRLrrFMpyAB4JQUWShTipxVcDRVWpZnrbMWaSU4FMbL 4+rUa7FQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vcmqY-0000000BdkP-2rDv; Mon, 05 Jan 2026 15:50:18 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vcmqV-0000000Bdhz-3WBH for linux-arm-kernel@lists.infradead.org; Mon, 05 Jan 2026 15:50:16 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 457B660141; Mon, 5 Jan 2026 15:50:15 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5F19FC19425; Mon, 5 Jan 2026 15:50:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767628214; bh=FMgH4tjmmPzyeMSdlENmcMAZuZ5jAY2wrE5NYUN4Hvk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Fqe6pn6Ocahv3hqhHuzUxcGmCjLM1isCKz3KxZSjp9wwvlnJhxkrD+jRFqBFnHK6t 3pCqJr/6H+dd3UOSyjGcTat3gebE8uZFWa5ur0yQEtjjyie+dLGSNek15sBlGzEe3O AAU4dpxz3/IEgRi/gr67OGMVX9ogEFmZRmSWuQJ7/OgCKAgr/gtcM3k8yY7RN4AwDe BlFKh4vyWkvaeISHUR0ki/1GU8xQMu+FTwB7fXBelbqplzn6B3IdZiHYMrDWhuun9e jidaSmoyi0bYYCICQED2UEtcuqArZzSUdvWMDTyY7PdcoLoozT2S/dEHhslYj9nOAE D3/3CP/tZmoUA== From: Will Deacon To: kvmarm@lists.linux.dev Cc: linux-arm-kernel@lists.infradead.org, Will Deacon , Marc Zyngier , Oliver Upton , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Quentin Perret , Fuad Tabba , Vincent Donnefort , Mostafa Saleh Subject: [PATCH 08/30] KVM: arm64: Prevent unsupported memslot operations on protected VMs Date: Mon, 5 Jan 2026 15:49:16 +0000 Message-ID: <20260105154939.11041-9-will@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260105154939.11041-1-will@kernel.org> References: <20260105154939.11041-1-will@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Protected VMs do not support deleting or moving memslots after first run nor do they support read-only or dirty logging. Return -EPERM to userspace if such an operation is attempted. Signed-off-by: Will Deacon --- arch/arm64/kvm/mmu.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index a888840497f9..8f290d9477d3 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -2419,6 +2419,19 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm, hva_t hva, reg_end; int ret = 0; + if (kvm_vm_is_protected(kvm)) { + /* Cannot modify memslots once a pVM has run. */ + if (pkvm_hyp_vm_is_created(kvm) && + (change == KVM_MR_DELETE || change == KVM_MR_MOVE)) { + return -EPERM; + } + + if (new && + new->flags & (KVM_MEM_LOG_DIRTY_PAGES | KVM_MEM_READONLY)) { + return -EPERM; + } + } + if (change != KVM_MR_CREATE && change != KVM_MR_MOVE && change != KVM_MR_FLAGS_ONLY) return 0; -- 2.52.0.351.gbe84eed79e-goog