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 D971C403B0C; Tue, 15 Sep 2026 16:02:56 +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=1789488179; cv=none; b=CKTOms8e0cajq7wyer0gGGlpeB96w2kDd4D0KVl/bfxiaE6aYsda0ll8qIkzgWbmrkN0gNvIaZMbgOuNTdYv97SR7RYqMpStifnNYr2aFzp+zlIFcqNmwb/CEEXzbZzQYP8YI3e+iKKz5AxPsAJrXk4rp1Nolmc4B3z34sYkFb0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789488179; c=relaxed/simple; bh=rO1Aepg+ZPdfUbjznCSF+LW5fDa0Tz1f7cbp73DbIAA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=TgmNlFhEbbJt4vjxuI9zoOoWKIBU6fwSb/+IbsLDicBF72rDJ553hrZcDiG0cyUXsQJ7kijq5E4SmZ3EYwg4M8cywvqfs7Zam0sT7fuqgILqX/5S9BXjGPt4f5uc28Kz9Jg3VdZ0ck39TVkkQF+21aYAiS9RS/f+VaONDbhAgsM= 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=kiTqgz1Y; 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="kiTqgz1Y" 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> Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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