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 69C0A10ED67C for ; Fri, 27 Mar 2026 14:01:47 +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=AiHG5n7P2ayM3uEFEPlReSOtNi8YGqLUC0wgcT0sKos=; b=exJgyL7iUJcI3AgFeYkKr4xJSX 2rZT2H/Jf9XQQZpIrVM1FEjW0hYzB5AALtCCfAux7MTFoGlnAoIITNyvr0cJ8z/oKrI6/bHvMuCWn c1IBCuY9gYDcshOuSs1MU0SA96190DOKV48OhEzp55ELtU/O3BDL4UoM8fVmTWOe6c9vuVIRY1m7S 72gr8oAOY61hYz8GCyCuq1edT9HWvX3OVnaYbvQJV2jH7INMcD9wG/Uu5Xo09HSC1BAeGMLwcEPxq y5ToItQ7R6TrRkxFmiZim5ILmw+i5IYDQyc3Z2Mq7ykQmfe9UH4bOgAhjCI50yQX7tQDLj/oxSVxw jefXHFRw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1w67kq-00000007Vsb-1b0t; Fri, 27 Mar 2026 14:01:40 +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 1w67kX-00000007Ved-0fCa for linux-arm-kernel@lists.infradead.org; Fri, 27 Mar 2026 14:01:22 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id D882A43464; Fri, 27 Mar 2026 14:01:20 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id F1729C2BCB1; Fri, 27 Mar 2026 14:01:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774620080; bh=ytSwSbutDYnmNQD/WJcRI42GxQWEkV8O9WbKsVxsWAc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pgsY3W6l72r3Ktoy08b2ty2QUdicC4H5HATTm3GIMJfbBw7gzPAlfk/MoICuTP5Wt 1CuTMwOSsUCQjy8KPk6nx0bUQ49PTmic25FjqpcIJePAMSj1I7K/JeJnrcPt3jd6yR PSinKgiBJgAxO5SRj/vcSpEYPoP4A8M3g61mT2MnXdfMCZ7TXwiggh2dSqVHEp7q1B BV4sETlYGDTWdggybJb87QHMTSV8DYmTtPK4GFfI0kxgAvBb7zfY4JQjzqCX6ZeUVv EQmExHk6KZo2y8ld+5vwCX7baPTFTuXtUt0152az68ro8MuKWJOsoLzGU5qo0bAZOA LXm6ryHFEH4Bg== 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 v4 09/38] KVM: arm64: Prevent unsupported memslot operations on protected VMs Date: Fri, 27 Mar 2026 14:00:08 +0000 Message-ID: <20260327140039.21228-10-will@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260327140039.21228-1-will@kernel.org> References: <20260327140039.21228-1-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-20260327_070121_229198_68ED40D2 X-CRM114-Status: GOOD ( 10.01 ) 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. Reviewed-by: Fuad Tabba Tested-by: Fuad Tabba Tested-by: Mostafa Saleh 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 5e7821fe0fc4..b3cc5dfe5723 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -2414,6 +2414,19 @@ 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; -- 2.53.0.1018.g2bb0e51243-goog