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 010DEF33A77 for ; Thu, 5 Mar 2026 14:44:50 +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=+KpvhV6Z2Zijz5Hjqf4/fTvOjLDrcBtYutGDN8npgmk=; b=e8rsNrmO7a5O2cMJ9isaxlkMpT Y2jJNC13mwtm47xkK6WUWB1bQ98wISftO8BLAVt+HR9swoI5Ucb/SpVue7rjjEgQ8ye6Cd/w6Yrr+ lVxfWHywBeL8eA0Wpwb9DPWO02t26pse1unWPM19NaHpN7kwoElojW6AjP37RZNIB0AxMWtriRp8m 88oMLecYVbDTFpXS4DW+aoYTSEpajyoDA/zTSecg1Y+lQSIDRkC5SShWXKBnRXNR7n7hAK26StaTU 0NBsdvsRZffEXrYrGEjXY7jDLtJozGvNJqJAt2/NxZBRIjqtsQ9ioolCM/2GrfiB/VoltRonKX1g2 Yq1mgh8Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vy9wU-000000021Kt-1izT; Thu, 05 Mar 2026 14:44:46 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vy9wT-000000021JN-1YU9 for linux-arm-kernel@bombadil.infradead.org; Thu, 05 Mar 2026 14:44:45 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Transfer-Encoding:MIME-Version :References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=+KpvhV6Z2Zijz5Hjqf4/fTvOjLDrcBtYutGDN8npgmk=; b=prB0sQZhys8QpbmfdAZK6wHEoT iISUtC8B8YRRi8qqn+9wlP8LyAfqsHXmOH894tATNHkiwZpWVImLsflmEI4n2xFUP/O3xfrfp+Jjl NbeLVbgL+GpYhFjhmxl62pCcEpchfwZ7zaCOJjKIPFceBxeMA3JOjqcpGb5opf2sjABDIinjTGcZO G9PVhoQUynEjul15xjMqs3a/gp1yNJRgHQjMeYs1/hQW2j4x8OJTZm9Jk+XCb0stnlyFeaAYT9NDR AtdBNudUcJnTAxWZnoawfYP9tul/V+Zx28h1yE2qP2ig61wgpQNoioOGwKdiXo5JjnNrjLf04T60M UiTZTgPg==; Received: from sea.source.kernel.org ([172.234.252.31]) by desiato.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vy9wQ-00000006yBm-2qIc for linux-arm-kernel@lists.infradead.org; Thu, 05 Mar 2026 14:44:44 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id CBF9E416CE; Thu, 5 Mar 2026 14:44:38 +0000 (UTC) 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> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260305_144442_889876_8C6BE86E X-CRM114-Status: GOOD ( 10.44 ) 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. 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