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 D76E23EF675 for ; Fri, 27 Mar 2026 14:01:20 +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=1774620080; cv=none; b=XDXGxx6za9dwLnOr6wdlGidZEhkdC6B8T7QoLRJnQF+II8tZQLVcMFYZer5kWRAbG8bBA/Dc6nxOK3p8/oFsxXMl0ubYWpvXXifFgeGGWeYl2mg6ZP4wRAd/JmmhcRNMiDF+0m4F5YH6lfyO5lAkNyJKSRVb+oHZ1QHm30HwyHw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774620080; c=relaxed/simple; bh=ytSwSbutDYnmNQD/WJcRI42GxQWEkV8O9WbKsVxsWAc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ptXfnT9vd7+ZiMD9sX+eBuNi+xYqLEgQc1Llz2N93NOHQa/3k3IJDq+EfWSIPba9EdOym216JzygbLpL4qgCh9ZZVVNJQihwrVe5EwlWREzuXFOIEIxxtm3ZG8AMyJP3sGQlfvQm9lewkQsjmz7BbyPNZBdcsyDwu7ABGQp8G0U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=pgsY3W6l; 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="pgsY3W6l" 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> 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. 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