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 F0CD1C55179 for ; Mon, 3 Aug 2026 13:47:07 +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=D/b0N8Y/tMcnyZPuKU7OxqPh0hlJP0FcE9Vdxb46/YQ=; b=OhncIMvxbp2BCoKks86h3Vi7sQ R6lb1G+dDfpye7h42uu6OvNMzJ8dFfCDoGZOPdZkolU/3xxqMjyCJshs48qlA75A4zCboI7fj3dk/ JNMN2r9cvXKw163b8i1wyf1s4mqpeSv5kTZ14IykVyKoq9/Pvxzr+QgMi1954sLj9gm3EwMnAqVF9 EmdHbl1NzkevbrujSBtuwuRdYHWVMWsRiRjLJ+kPIqpd/fA1qw+DZohYUm6Opo90XzBn/IbeGwawo PxRCG2nsgVud8TzZkeTgsOa80A4W1u2aCzLcez0XY/vOTZNeR0/bTBKYSlOZp5toQe9aUDt5SKvBd cj4Rx0Tg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wqt0K-0000000HE7W-40e0; Mon, 03 Aug 2026 13:46:56 +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 1wqt0H-0000000HE4g-3qeu for linux-arm-kernel@lists.infradead.org; Mon, 03 Aug 2026 13:46:55 +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 DC78D1655; Mon, 3 Aug 2026 06:46:47 -0700 (PDT) Received: from e122027.cambridge.arm.com (e122027.cambridge.arm.com [10.1.25.28]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 74DCB3F66F; Mon, 3 Aug 2026 06:46:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1785764811; bh=tOBslaJ98uztlGsY7JxHxX4R0AkDQJN14zYapGPHB9A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=va0zPPo4ixfUqTb4IhQPPk9m3XqIELYDEWP5J7e4dvfXFMvMkXnsc7c96jh26kTxV PVvk6ycb1FDT+kSz6Jr0wFqkNbDlHN67DOU2Cg90f/GmRBultW10i3TcihCv7RyF7Y YbapyHir86nROK91GDfhU3avvLi5u/LE8jUaUE4s= 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 Pieralisi Subject: [PATCH v16 33/45] KVM: arm64: WARN on injected undef exceptions Date: Mon, 3 Aug 2026 14:43:49 +0100 Message-ID: <20260803134403.80630-34-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260803134403.80630-1-steven.price@arm.com> References: <20260803134403.80630-1-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-20260803_064653_994758_C7A47084 X-CRM114-Status: UNSURE ( 8.96 ) 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 --- 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 6492397b73d7..718419f40c1d 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) { + 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