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 D8AC3C982CA for ; Tue, 15 Sep 2026 16:03:14 +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=a67IVBhLqJsNZgbAOnCBjd8kwbFGfzIHkQwNN+tuD44=; b=p/ZCCxRQA4CgHWsvr558ZVSyx9 9h8EcCSWJ4/4lla2dWNl6qNSMWdTK3jSY5vAsHWIaCYo7gYV61XYQ4Q+cR9JLERwqVFRDFbZnnBvq LdhDNdFV2xyIybKP9dcdaGK9DwnDsvtXbCMZClqNSpl1OOM5rODFzlRcAu2DzB8ECqgA8EIZr7cvj pwQqE+yu7BviZGLAAb5lsvzW5YExTqQRD3gSY4g/8d3g5iSDbBNBa6nPObPNvoGRYO7V5yYLOS+Wt QOLcqS7MeweAWEIcRYS0jETHSF3SfiXFZrlyAqbxf/CQUE7Z3PrLlKXG80KJY10KuvdtZBEtLToZS 4WZd/PSw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x6Vch-00000007LtB-3Hh1; Tue, 15 Sep 2026 16:03:07 +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 1x6VcW-00000007LiK-2H3C for linux-arm-kernel@lists.infradead.org; Tue, 15 Sep 2026 16:02:57 +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 61F111D70; Tue, 15 Sep 2026 09:02:52 -0700 (PDT) Received: from ewhatever.cambridge.arm.com (ewhatever.cambridge.arm.com [10.2.197.99]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 5B9AD3F882; Tue, 15 Sep 2026 09:02:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1789488176; bh=rO1Aepg+ZPdfUbjznCSF+LW5fDa0Tz1f7cbp73DbIAA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kiTqgz1Yy7gR4b79nYtgyPn5gKXuxc5Ql439+CksEyu0ACTiBZF3AQnCkHudHESRL 56Vb4DL+sRoAZFCxozDJsocWeomwOVq3oITqrg/vq1LrdObvOx19lnRGaH0eq+s+EV iOwXxpFgCoINxg9YqCKXx/dlurAbS+Nv4jR1BzwY= From: Suzuki K Poulose To: kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: maz@kernel.org, will@kernel.org, catalin.marinas@arm.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, steven.price@arm.com, aneesh.kumar@kernel.org, oupton@kernel.org, gshan@redhat.com, joey.gouly@arm.com, tabba@google.com, yuzenghui@huawei.com, linux-coco@lists.linux.dev, gankulkarni@os.amperecomputing.com, sdonthineni@nvidia.com, alpergun@google.com, fj0570is@fujitsu.com, WeiLin.Chang@arm.com, lpieralisi@kernel.org, enju.kohei@fujitsu.com Subject: [PATCH v18 21/23] KVM: arm64: CCA: WARN on injected undef exceptions Date: Tue, 15 Sep 2026 17:01:39 +0100 Message-ID: <20260915160141.3543048-22-suzuki.poulose@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260915160141.3543048-1-suzuki.poulose@arm.com> References: <20260915160141.3543048-1-suzuki.poulose@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-20260915_090256_632991_D9D9CEA6 X-CRM114-Status: UNSURE ( 8.51 ) 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 From: Steven Price 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 --- Changes since v15: * Switch to KVM_BUG() to mark the VM as bugged as well. 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 d6c4fc16f8795..d61a3ff04fabb 100644 --- a/arch/arm64/kvm/inject_fault.c +++ b/arch/arm64/kvm/inject_fault.c @@ -317,6 +317,7 @@ void kvm_inject_size_fault(struct kvm_vcpu *vcpu) */ void kvm_inject_undefined(struct kvm_vcpu *vcpu) { + KVM_BUG(vcpu_is_rec(vcpu), vcpu->kvm, "Unexpected undefined exception injection to REC"); if (vcpu_el1_is_32bit(vcpu)) inject_undef32(vcpu); else -- 2.43.0