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 6701141CB52; Mon, 3 Aug 2026 13:46:52 +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=1785764813; cv=none; b=LyQkMEkTe7xUtIo8o3hm4yswpovL9kswdOhYZTej6LSl/qNbJn4+eXDTwukhE3eKkvqf1iz2N3PEO3BM9Y+94kiuq4ybFN1LYEHP5kYVS5zSmklW/o2Qo/j0jMwJFS3JRnRuyCxVNnCg5kOPz6RrpFr+yNpm9UIJHcPERnxqb9s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785764813; c=relaxed/simple; bh=tOBslaJ98uztlGsY7JxHxX4R0AkDQJN14zYapGPHB9A=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=sa5JbvRTT9WiaxMgqhyhmDH9loJIVgvnuD3r3Cxh1FaNg7teZxqoEfxPOg634nHlA+IkFNPtLmDaEHM/+lko0Kbgz9xoc57d6VJKvrpfPL1Uv4KSiNDQUTN7rPf2xUe9VHVId9VRGv2vuAMT3c+DU7XqXiRgpg/S0nUeGwgimGc= 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=va0zPPo4; 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="va0zPPo4" 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> 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 --- 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