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 1839A3A9DB3 for ; Thu, 5 Mar 2026 14:44:38 +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=1772721879; cv=none; b=K6v4ZWs3XRZ7uYjYBf9BKStyz+xycLFgAvty2pw99fAANErGDg7hpqAqae4C863EKbaa+PQ6mVcNdIREtATpQhYBtIyuEFzd63hRnFQG9HymE+YItKzQ/BKxwgQVVo5pKojBYNg17JB+ww049jmuo1KbRzeCrupsFkQK0bklppI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772721879; c=relaxed/simple; bh=g/Zjk5jkRbl4Sru6ybglMk9XL7QaR20Q/om4UqiG45E=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=jEpNoKvJ/uaYGK+eW23Rb23g17OZGYCbJIfKlaYpm2iPnMs9tAafamyYAwKOgHd/r8Vt/mfPP4o6pM2zpDqNsSLWjNalzJcoti6Zyt6HyDq+bSsp4ScS79aY98ENdMvWzQoqlPBgDMPw+3gSyP70NulFFRctxIQ7DfWnSHUVj0c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=FC4PWwro; 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="FC4PWwro" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C56CEC19423; Thu, 5 Mar 2026 14:44:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772721878; bh=g/Zjk5jkRbl4Sru6ybglMk9XL7QaR20Q/om4UqiG45E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FC4PWwroYFK09krMxS/0KwvZpeApYiaRGBBSKLDOusrbSEvExxom4WCxG9Cc+p8xm 2dgz3hReqd0jxyldbwAmSod/tx7oy47rS2SXfZm5YOp5LH+X9cs7J+fCOmLFfAduWp zrrhRqjDZOvGLwhmIx8lPKdO/aBND+kD8zEvna/N1Gca3CWarRR8lnTRBSkAzXdBcR MdaYacLyet65jC6OsF6SLgVfbzsnN4YxOIjmKH917ntjAUVBeMx0+dhpTYlT2B4O6l fzJQJVn9DGJiq68vSxzvnuHaN6uA7wpfg4jCoxXmHAvHDVNFXeN36aJ9UDknrFA9Vn CvpHdbtKurk5w== 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 , Alexandru Elisei Subject: [PATCH v3 08/36] KVM: arm64: Prevent unsupported memslot operations on protected VMs Date: Thu, 5 Mar 2026 14:43:21 +0000 Message-ID: <20260305144351.17071-9-will@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260305144351.17071-1-will@kernel.org> References: <20260305144351.17071-1-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 43632c69adaf..9d183df0b0ac 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -2410,6 +2410,19 @@ 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; -- 2.53.0.473.g4a7958ca14-goog