From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 5EBFC481FC1; Wed, 15 Jul 2026 14:31:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784125862; cv=none; b=ERb2N0itMJMjxAHi5exAVEUekpV5tM7pogPe2zElyyt1Ax1V8zrZBW1Y/zZjimrkukHL4S+oKkvE+s86D1U68QtMAKlm0S7ygmNIhBObv6iuVaBrst+gADbhWsxLpD8yNklBSf8VU9zSOfrtAKMUbO/y5WQDwnA+yViOvns5zpg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784125862; c=relaxed/simple; bh=2aEkh45BUa3FK3LhN0kNkj+5k/8j4Xl4y0clqTp86E4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ClHtxTvB8c871yyki1kK50uxyvxDR8e8xG/KdYEmPihycPsYnuuKynTcNRuMhrECL/EjH9hHV0Ls6iD0ndqdDYweBmvaKevIpv4V4pGBUOMHi4g5ieENjaYCyhAyDRvxje7yJzFuczT119b/FasM+hY7YYl+ZIzw/urD0CdY8qU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=WdClv8Nn; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="WdClv8Nn" 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 7ED2D1576; Wed, 15 Jul 2026 07:30:55 -0700 (PDT) Received: from e122027.cambridge.arm.com (e122027.cambridge.arm.com [10.1.25.27]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id DAA273F7B4; Wed, 15 Jul 2026 07:30:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1784125859; bh=2aEkh45BUa3FK3LhN0kNkj+5k/8j4Xl4y0clqTp86E4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WdClv8Nnewj7SDK99ddz4Y2bT+yeTAd1HYAfW+ATvuRDIXSL+RzB9ZxC6zFN382T3 I1+1Zx5hvN7S16QnFNy1kuiGFjKk5mzqtRUMIuLzNzww+3Eac1pvM83w8oqq2bZqs9 lpg/JL8au3NzURpfQrB76GZDUlMaWjnuC5gfuowI= 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 v15 26/37] KVM: arm64: WARN on injected undef exceptions Date: Wed, 15 Jul 2026 15:28:28 +0100 Message-ID: <20260715142841.80544-27-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260715142841.80544-1-steven.price@arm.com> References: <20260715142841.80544-1-steven.price@arm.com> Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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