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 E0A234C9567; Wed, 13 May 2026 13:21:19 +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=1778678481; cv=none; b=HRlec/MtizRm8GBFvf2Uir2gGdE7i4A3EIjt9J7bsaokAeXpMQO8dmG0PIuM8jZjejKe1sogbChFYsjTN45JUlPqjuCwBmInyTl9JOa+7PcqviXMHCzdrDeQd9oXSmgTdMAzrsIt6gfF4zWqKMHr5qj4YW59HbQ66OHGFnPNHNk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778678481; c=relaxed/simple; bh=2aEkh45BUa3FK3LhN0kNkj+5k/8j4Xl4y0clqTp86E4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=gHdLHfUZ1AYTKDE+hK//OGD4bfq0hlXJjZUgMq5+VBn1Kn82qG7lj1vZOQJplXPpzo8hxEzp0yAARMY9iK1ZnfBYS5seKWbO0EUSCoCp2xD0k6OvDm+SZ4NAonG2qmIdsuHbqhE95G77h3MvE9/O4qAb+lTA3V64fTZciqFLTeU= 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=ijEDZGy1; 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="ijEDZGy1" 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> 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