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 1B2F8CCF2F8 for ; Mon, 19 Jan 2026 12:47:47 +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=ZOhFAgQx7UTfmysW69H5vV/HYgWt5xRYFrDctb7UOo4=; b=g1Vf12f7maPvWwj/wPQyLVoWFu ssldM0Ii31XiJBtBmAykRpPDR2jnp0p6firnaka5jTer1Tv1QV9ChYNgZ6jPJfOmb4mLUZHtktVES gH2jIiKw1BmKyVmiwk731cV0hsu2P/LZtwRhFn2eRp0ZE6PUP77hBOAgfxaW5IcAD+j8WtbG/S0Rp rsuQVBZr/jZ/phVCLOzDMka7rehQ7SUfKr4jOhMmYvXuj9r34YvDsEnnsbQ1MuSffUIhWxcLIZafn M544oIR2LaoJvTM9eKF3PA+KjX9Hu4XtROpJs0FEwF2E0lxdwaGbSKxkyOzcO+TEvFHpuE+aD2XRT TSLt71bA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vhofP-000000023Ot-3OnM; Mon, 19 Jan 2026 12:47:35 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vhofB-000000023G0-1r04 for linux-arm-kernel@lists.infradead.org; Mon, 19 Jan 2026 12:47:24 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 0BE9043DB0; Mon, 19 Jan 2026 12:47:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5D7A9C19423; Mon, 19 Jan 2026 12:47:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768826840; bh=8iNT4oQAeGWJG0Dr79nIPwJzjgkxNXQGMTbbi7cpd2Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZAQfLsbTbX8Vxk5iZ2AIRHCZtghLQ8Y3mvrrX46JtllSvwyNmcJK/psOh4Ywh+BWW yrD2FvmV1igIMzgtKybK2cuO93rpCEJxG66lLKuFBfnKz6S3t3x5Xupyhr4OTZS3lM Mhe69t2ypF4z0TIM13paTzokaO2fJGZvqoAVju7N4h48jwNZWl8Bf3IKL8+TYyKTpQ Cye6psd2J2BmCFnuIqxJBAPSdEHPBqXhhqxRxXVqLDHNmA9Nll8p1In5OuHdRUagRQ 2B1UuqyZHqBDHaw9DbkzIWRj7+KgCvXxIaY5TGx+rTr41dvVvlldaJMkDG8z+YiOJs 7ruhqlXoPYQFw== 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 v2 09/35] KVM: arm64: Prevent unsupported memslot operations on protected VMs Date: Mon, 19 Jan 2026 12:46:02 +0000 Message-ID: <20260119124629.2563-10-will@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260119124629.2563-1-will@kernel.org> References: <20260119124629.2563-1-will@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260119_044722_949850_3A451199 X-CRM114-Status: GOOD ( 10.90 ) 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 f535a180fc1e..a23a4b7f108c 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; -- 2.52.0.457.g6b5491de43-goog