From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3AC0735E53A for ; Mon, 19 Jan 2026 12:47:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768826841; cv=none; b=CnWVDGGw0HX6Q8JDclOJAg3suUQucyUaqTzMFzlT8vmVFCGh7utQYcqGaZ7vBc8sZF5KScN94PFeseL28JDMJmmFRbI0J6USBTSF+0T3iFJ6D82D09b0Pl36ZdbQX9AgYVB2CXN/k7tVjU1alRPHhxIgxa0PtVjzSEYDdcF5TqU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768826841; c=relaxed/simple; bh=8iNT4oQAeGWJG0Dr79nIPwJzjgkxNXQGMTbbi7cpd2Q=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ZKKDpWUDPcF39Q20LW4ofCa4uzM1FGa0siTTQSuh1qRu+2G6PgLtKfOlZG9PQS56XLXtNwb8kGniX3VSvx5Z3z9R2046Zf2QkT3iAJ3857Sss+HQAUIOE3rKDX90Iw04xBeX22xo+rA9qb9J4qunTtrrG1l3l1VwkgBWZKM1W9s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ZAQfLsbT; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ZAQfLsbT" 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> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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