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 A700A31A56C for ; Mon, 5 Jan 2026 15:50:15 +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=1767628215; cv=none; b=AF2Gu36yrI3MsA8SeeCwxmVlFN3zSvRe/QdDFXUL9h2Qv1uSZClf9L/b5zZQhujUjC43/H2NYHQWmorot7TV7wjeAm/hf6qh1BTty9yf6FiwJvAak1EfP20RnD2gtzEMAMc0QrLOnpLHK2uJO9G4pWHp75PPgyBZj9WbTsj+A+E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767628215; c=relaxed/simple; bh=FMgH4tjmmPzyeMSdlENmcMAZuZ5jAY2wrE5NYUN4Hvk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=CEGLngJnZCfJSkYpzQtJo1ORzE089AN0DCWbZxE0v0cm0QJOQZbSfyhavEeEZKm5iTBuMy9YdT1aQ6SrEQhJnbKBW34Plns9jGTa8F+6EwQV+KPlK7MJYbkoDGH4D+U5SZLwPFchR+45DB4x/7Ocn3jUK6Lc4inehHcAcRhbW7I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Fqe6pn6O; 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="Fqe6pn6O" 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> 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 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