From nobody Tue Mar 3 03:36:48 2026 Received: from mail-pl1-f201.google.com (mail-pl1-f201.google.com [209.85.214.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 742B2372EC2 for ; Mon, 2 Mar 2026 21:26:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772486784; cv=none; b=lSOyuVRSS6wFleERr9CIuWo5N8cAquyenX73upCX8OdvOPqgoDHob1MdTnQ2W3qWaRp9GtiC53/WLc1OXs36sDAa1iiBCXiw5p8u82VGiJj/tQh/i22NGx3jLKawYungWS3SOK4kgoWOzOXYAvlaQiDqS4czXlZPjJPYy/qnO+0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772486784; c=relaxed/simple; bh=pFUPbp80vEwcgpNceRaPXqwEX3X3g1P/RAB57XGPFBo=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=Ip5yQtTFeLDSFs93WBTL5m47zNuj1S4HnmT34FQSZiaMMOJ6XtwENTBb19KoUzBlmmTXf/mzOLfZWEUzKex1OuXWVwGMvh+KyEPg5cCLIYk6coKKaYPZkd7xsqS/6Wcpoq3E9siP8riNSrs4gPzNhrNZi0lqxzjc6unvtlV0CWY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=h+CKCzHA; arc=none smtp.client-ip=209.85.214.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="h+CKCzHA" Received: by mail-pl1-f201.google.com with SMTP id d9443c01a7336-2ae4cdfc468so15361985ad.2 for ; Mon, 02 Mar 2026 13:26:22 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1772486782; x=1773091582; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:reply-to:from:to:cc :subject:date:message-id:reply-to; bh=b6Vn47yZY8dJtLejZL9u/YV0jGur9tGGJ3eXMFAT82o=; b=h+CKCzHA8ObibXhHsg9oQC4ZRF3n+IcJQprLDtcf4BRKkoCM4c8ee5w1TPZH+h82Go CpMO4GTF30jjc0MpsTN7HuDs96YySdbUdDpO7L3eOAOzHIHwUeZ+wmTAgSLt2VM/JaZo 3rHcb9NK9v/WS1X9YC5S3zscRrapkuRk+Y2RIZMWi7Ze5RYQeW6fKp4EmMrvhyt3mjF2 iOjM0Y4PPlFFIwlxxtDi2WAhiN6VvgBEgAP8OGwKQ+osM3JS14InkaOFGPpCclVqBxYC l6S9RXloQ68PGQEyE6Ohxq3TytS9J/jr/cstITOy/QWy/7sxkVIDv4LnPGjoYIrmC6Kd LcqA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1772486782; x=1773091582; h=cc:to:from:subject:message-id:mime-version:date:reply-to :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=b6Vn47yZY8dJtLejZL9u/YV0jGur9tGGJ3eXMFAT82o=; b=U3c57dtkcehk5e9cGsEkBR5czNE1q99MIRGbqCJ+QplQONxfDM9JAmOY2Bdz+En95z AHAuuhV4IsrUXXPYh1r6j4gPbR39z9GND+LWSmzlr0opmfQIMGfsQ4WCsbsEWcywuyC0 4OZnxl/GnhZMOm0L3EdZ4WyrwhRU+WYHqgAPerqPudaEbJcSz9a/M961Hwng0bC+MEQM 1ao9aQZ1amkJMouUgc8GBJ0aRhVVF8Axeg8uVDSvG6uCbvf50/tA9O+8PcXbY48UjGzN Kjm0T0dfAxMsMkT6Qi4yNkCGuuEx4NM5tUZtayvdlAj/bqlpuLo6PZow3d/8zPEHaWE+ 7/aA== X-Forwarded-Encrypted: i=1; AJvYcCXXi0gASC4JCEcmgMW9x5hxeXn6JGyULQiKMe912zfoKgrKx1YfYFVMw4m1JI15EAUmb3rGbS33R19/PWk=@vger.kernel.org X-Gm-Message-State: AOJu0YwC8rIsYSlYIERPpUAcPe4HS75Jl9qkSQ3Jg4ApzdEWtZn6v0fA KLT0Lc9IAmisX2XCZJHoxP+tmdJrz9g1B6+X8qcR2oAuhuVBzdhDlmYJfObPT525LwleNU6uOHl eSxqYMA== X-Received: from plfp3.prod.google.com ([2002:a17:902:e743:b0:2a7:6cb8:a982]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:903:144b:b0:2aa:d671:e613 with SMTP id d9443c01a7336-2ae2e4b54efmr143178755ad.38.1772486781549; Mon, 02 Mar 2026 13:26:21 -0800 (PST) Reply-To: Sean Christopherson Date: Mon, 2 Mar 2026 13:26:19 -0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.53.0.473.g4a7958ca14-goog Message-ID: <20260302212619.710873-1-seanjc@google.com> Subject: [PATCH] KVM: x86: Immediately fail the build when possible if required #define is missing From: Sean Christopherson To: Sean Christopherson , Paolo Bonzini Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Alexey Dobriyan Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Guard usage of the must-be-defined macros in KVM's multi-include headers with the existing #ifdefs that attempt to alert the developer to a missing macro, and spit out an explicit #error message if a macro is missing, as referencing the missing macro completely defeats the purpose of the #ifdef (the compiler spews a ton of error messages and buries the targeted error message). Suggested-by: Alexey Dobriyan Signed-off-by: Sean Christopherson Reviewed-by: Yuan Yao --- arch/x86/include/asm/kvm-x86-ops.h | 10 ++++++---- arch/x86/include/asm/kvm-x86-pmu-ops.h | 8 +++++--- arch/x86/kvm/vmx/vmcs_shadow_fields.h | 5 +++-- 3 files changed, 14 insertions(+), 9 deletions(-) diff --git a/arch/x86/include/asm/kvm-x86-ops.h b/arch/x86/include/asm/kvm-= x86-ops.h index de709fb5bd76..3776cf5382a2 100644 --- a/arch/x86/include/asm/kvm-x86-ops.h +++ b/arch/x86/include/asm/kvm-x86-ops.h @@ -1,8 +1,9 @@ /* SPDX-License-Identifier: GPL-2.0 */ -#if !defined(KVM_X86_OP) || !defined(KVM_X86_OP_OPTIONAL) -BUILD_BUG_ON(1) -#endif - +#if !defined(KVM_X86_OP) || \ + !defined(KVM_X86_OP_OPTIONAL) || \ + !defined(KVM_X86_OP_OPTIONAL_RET0) +#error Missing one or more KVM_X86_OP #defines +#else /* * KVM_X86_OP() and KVM_X86_OP_OPTIONAL() are used to help generate * both DECLARE/DEFINE_STATIC_CALL() invocations and @@ -148,6 +149,7 @@ KVM_X86_OP_OPTIONAL(alloc_apic_backing_page) KVM_X86_OP_OPTIONAL_RET0(gmem_prepare) KVM_X86_OP_OPTIONAL_RET0(gmem_max_mapping_level) KVM_X86_OP_OPTIONAL(gmem_invalidate) +#endif =20 #undef KVM_X86_OP #undef KVM_X86_OP_OPTIONAL diff --git a/arch/x86/include/asm/kvm-x86-pmu-ops.h b/arch/x86/include/asm/= kvm-x86-pmu-ops.h index f0aa6996811f..d5452b3433b7 100644 --- a/arch/x86/include/asm/kvm-x86-pmu-ops.h +++ b/arch/x86/include/asm/kvm-x86-pmu-ops.h @@ -1,7 +1,8 @@ /* SPDX-License-Identifier: GPL-2.0 */ -#if !defined(KVM_X86_PMU_OP) || !defined(KVM_X86_PMU_OP_OPTIONAL) -BUILD_BUG_ON(1) -#endif +#if !defined(KVM_X86_PMU_OP) || \ + !defined(KVM_X86_PMU_OP_OPTIONAL) +#error Missing one or more KVM_X86_PMU_OP #defines +#else =20 /* * KVM_X86_PMU_OP() and KVM_X86_PMU_OP_OPTIONAL() are used to help generate @@ -26,6 +27,7 @@ KVM_X86_PMU_OP_OPTIONAL(cleanup) KVM_X86_PMU_OP_OPTIONAL(write_global_ctrl) KVM_X86_PMU_OP(mediated_load) KVM_X86_PMU_OP(mediated_put) +#endif =20 #undef KVM_X86_PMU_OP #undef KVM_X86_PMU_OP_OPTIONAL diff --git a/arch/x86/kvm/vmx/vmcs_shadow_fields.h b/arch/x86/kvm/vmx/vmcs_= shadow_fields.h index cad128d1657b..67e821c2be6d 100644 --- a/arch/x86/kvm/vmx/vmcs_shadow_fields.h +++ b/arch/x86/kvm/vmx/vmcs_shadow_fields.h @@ -1,6 +1,6 @@ #if !defined(SHADOW_FIELD_RO) && !defined(SHADOW_FIELD_RW) -BUILD_BUG_ON(1) -#endif +#error Must #define at least one of SHADOW_FIELD_RO or SHADOW_FIELD_RW +#else =20 #ifndef SHADOW_FIELD_RO #define SHADOW_FIELD_RO(x, y) @@ -74,6 +74,7 @@ SHADOW_FIELD_RW(HOST_GS_BASE, host_gs_base) /* 64-bit */ SHADOW_FIELD_RO(GUEST_PHYSICAL_ADDRESS, guest_physical_address) SHADOW_FIELD_RO(GUEST_PHYSICAL_ADDRESS_HIGH, guest_physical_address) +#endif =20 #undef SHADOW_FIELD_RO #undef SHADOW_FIELD_RW base-commit: 183bb0ce8c77b0fd1fb25874112bc8751a461e49 --=20 2.53.0.473.g4a7958ca14-goog