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 96E2CCD4F24 for ; Wed, 13 May 2026 13:21:37 +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=kb4r7MJ9X8sbqK26tlqzIP/fw+T0owhpUUnqxJzV9Ic=; b=DAamaOLCTqJcB/xbbYjL+419l+ pey16vaynlBLg2Yuajh1aBK6W4hgXpQM+k0Fvd9Bgz2N2TX/zr9gxNUPYLJ52Sv1EY93bemrWvlmW UUoc9NddzPqwvKdbQIhOriNOCwF8bSQYZh0ie9uYBOC6iMmkVXNiDtyX3pbvL6K8pIzsHE+ubUXE1 xh+MD3jRRk/yFhVLC8RKbEUiYGE3sl0RFzVaPd2pMRMxTec3McPHRxf6EZupUnJew25FAJOrywssi 8CsF4C0reiaE94jeN3jdq7D+HaFRAxGcqrfVMW8PHDlwVHKZIiWZg9UkzH6xcihF88iMA73AsGH31 gKXlML5w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wN9Wk-00000002hgs-1Eds; Wed, 13 May 2026 13:21:30 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wN9Wa-00000002hUH-0wbZ for linux-arm-kernel@lists.infradead.org; Wed, 13 May 2026 13:21:28 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 1F2CA302F; Wed, 13 May 2026 06:21:14 -0700 (PDT) Received: from e122027.arm.com (unknown [10.57.68.187]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 498CF3F836; Wed, 13 May 2026 06:21:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1778678479; bh=2aEkh45BUa3FK3LhN0kNkj+5k/8j4Xl4y0clqTp86E4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ijEDZGy17jJXumcF5H4uNrCF+NsJHsRv05nKuEF3U1PBrpItsExY13Pk77W3U6jRS we3xLSKJOcS+7xegcwbxiC2BaY/F6Oj5rkYVwFC5S/0QAYoKHB/F4F2/SE2j8y9MJr awxIuSdI5c6BWJE5R1TTZgZeJJx1LlYlOZk1HwDo= From: Steven Price To: kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Steven Price , Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , Suzuki K Poulose , Zenghui Yu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Joey Gouly , Alexandru Elisei , Christoffer Dall , Fuad Tabba , linux-coco@lists.linux.dev, Ganapatrao Kulkarni , Gavin Shan , Shanker Donthineni , Alper Gun , "Aneesh Kumar K . V" , Emi Kisanuki , Vishal Annapurve , WeiLin.Chang@arm.com, Lorenzo.Pieralisi2@arm.com Subject: [PATCH v14 33/44] KVM: arm64: WARN on injected undef exceptions Date: Wed, 13 May 2026 14:17:41 +0100 Message-ID: <20260513131757.116630-34-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260513131757.116630-1-steven.price@arm.com> References: <20260513131757.116630-1-steven.price@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260513_062120_359904_C6709DAD X-CRM114-Status: UNSURE ( 7.86 ) X-CRM114-Notice: Please train this message. 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 The RMM doesn't allow injection of a undefined exception into a realm guest. Add a WARN to catch if this ever happens. Signed-off-by: Steven Price Reviewed-by: Gavin Shan Reviewed-by: Suzuki K Poulose --- Changes since v6: * if (x) WARN(1, ...) makes no sense, just WARN(x, ...)! --- arch/arm64/kvm/inject_fault.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/kvm/inject_fault.c b/arch/arm64/kvm/inject_fault.c index 6492397b73d7..613f223bc7a3 100644 --- a/arch/arm64/kvm/inject_fault.c +++ b/arch/arm64/kvm/inject_fault.c @@ -327,6 +327,7 @@ void kvm_inject_size_fault(struct kvm_vcpu *vcpu) */ void kvm_inject_undefined(struct kvm_vcpu *vcpu) { + WARN(vcpu_is_rec(vcpu), "Unexpected undefined exception injection to REC"); if (vcpu_el1_is_32bit(vcpu)) inject_undef32(vcpu); else -- 2.43.0