From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F0D0B606A32A for ; Mon, 9 Nov 2026 08:49:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=pd427nZ6; dkim=pass (1024-bit key, unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=aKniBgn2 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-Unsubscribe-Post: List-Owner; bh=9EDiuahpoC5a8fdBVjn+7UwWB1qVxtY459zTXN5uFBc=; b=pd427nZ6Fz9Qgr uAIL7Yrm0hL5N+JOp2YymHFQBXITmm0Y6C0GgmW2Mwjojs3fnipjPCLMdIdAn6ZDWsfAqlDtrdWKh H7xduSNfIxJ5763FrtGz+gSNwArpylXEExs5ZGF8rinVUklnTH2PMFjxvW4XkPxnDT8AYW/THH4hS cLvo7LdLJPQLDPqWHl6CzVJZqzfS2w/NrjvMogP6mdo5wYht3txHM/MpMQjAWqMKMkXCCF3wqNBCh DjBQ2vvl/kHdLo+uKifRBsGoLwJ1Y9mhTP4CXu1jUmfbIZkoM4Jsvl9wBtn1DEPs00LnWlErXnghL v2WJQnmoH1uCh/7vOS6g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xQL3m-0000000076r-49gK; Mon, 09 Nov 2026 08:49:02 +0000 Received: from out-97.mta1.migadu.com ([95.215.58.97] helo=mta1.migadu.com) by bombadil.infradead.org with esmtps (Exim 4.100.1 #2 (Red Hat Linux)) id 1xQL3i-0000000074c-0Aj8 for linux-arm-kernel@lists.infradead.org; Mon, 09 Nov 2026 08:48:59 +0000 X-Envelope-To: linux-arm-kernel@lists.infradead.org DKIM-Signature: a=rsa-sha256; bh=zpKaD0TgIJfqXkuMLyaymhMm6AH9D97hWArAafrSB6U=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1794214136; v=1; x=1794818936; b=aKniBgn25IHI6/+paezktja3kzUe2XHYTbZvR+c/c7IlRhOWL6NzzF3m11fb8KQs/r5okijz /HUM78yf3sesqRmdI2T9Ze8vyBoxAkGO0SMDUqxoZWloB6hglXKhuB9wlHE1fyeWgZUyqlOV3x1 R8V3eI0h2bytT8Y8YlFyZWJ8= X-Envelope-To: linux-arm-kernel@lists.infradead.org Received: by smtp.migadu.com with ESMTPS id 9a819a32ecff5883; Mon, 09 Nov 2026 08:48:55 +0000 X-Mizu-Trace-ID: 9a819a32ecff5883 X-Migadu-Flow: FLOW_OUT From: Fuad Tabba To: Marc Zyngier , Oliver Upton Cc: Will Deacon , Catalin Marinas , Mark Rutland , Paolo Bonzini , Sean Christopherson , Shuah Khan , Joey Gouly , Steffen Eiden , Suzuki K Poulose , Zenghui Yu , Vincent Donnefort , Quentin Perret , Fuad Tabba , kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 01/19] KVM: arm64: Hide generic ptrauth from protected VMs without ptrauth Date: Mon, 9 Nov 2026 08:48:36 +0000 Message-ID: <20261109084854.840576-2-fuad.tabba@linux.dev> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20261109084854.840576-1-fuad.tabba@linux.dev> References: <20261109084854.840576-1-fuad.tabba@linux.dev> X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261109_004858_248212_BFDA4D29 X-CRM114-Status: GOOD ( 10.64 ) X-Spam-Score: -2.8 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-18.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 A protected VM without the ptrauth vCPU features shouldn't have pointer authentication in its ID registers. Commit 3d7ff00700d1 ("KVM: arm64: Rework specifying restricted features for protected VMs") gated APA, API, APA3 and GPA3 on vm_has_ptrauth(), but left GPA and GPI capped at IMP. So generic authentication is advertised to a protected guest without ptrauth, and PACGA UNDEFs. Gate GPA and GPI on vm_has_ptrauth() too. Fixes: 3d7ff00700d1 ("KVM: arm64: Rework specifying restricted features for protected VMs") Signed-off-by: Fuad Tabba --- arch/arm64/kvm/hyp/nvhe/sys_regs.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kvm/hyp/nvhe/sys_regs.c b/arch/arm64/kvm/hyp/nvhe/sys_regs.c index 32e82653ebf7e..e5502d5651b05 100644 --- a/arch/arm64/kvm/hyp/nvhe/sys_regs.c +++ b/arch/arm64/kvm/hyp/nvhe/sys_regs.c @@ -157,8 +157,8 @@ static const struct pvm_ftr_bits pvmid_aa64isar1[] = { MAX_FEAT(ID_AA64ISAR1_EL1, JSCVT, IMP), MAX_FEAT(ID_AA64ISAR1_EL1, FCMA, IMP), MAX_FEAT(ID_AA64ISAR1_EL1, LRCPC, LRCPC3), - MAX_FEAT(ID_AA64ISAR1_EL1, GPA, IMP), - MAX_FEAT(ID_AA64ISAR1_EL1, GPI, IMP), + MAX_FEAT_FUNC(ID_AA64ISAR1_EL1, GPA, IMP, vm_has_ptrauth), + MAX_FEAT_FUNC(ID_AA64ISAR1_EL1, GPI, IMP, vm_has_ptrauth), MAX_FEAT(ID_AA64ISAR1_EL1, FRINTTS, IMP), MAX_FEAT(ID_AA64ISAR1_EL1, SB, IMP), MAX_FEAT(ID_AA64ISAR1_EL1, SPECRES, COSP_RCTX), -- 2.47.3