From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E9C02C43219 for ; Mon, 10 Oct 2022 07:14:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231824AbiJJHOJ (ORCPT ); Mon, 10 Oct 2022 03:14:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34450 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232094AbiJJHNK (ORCPT ); Mon, 10 Oct 2022 03:13:10 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 937D524084; Mon, 10 Oct 2022 00:08:33 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 6DB93B80E62; Mon, 10 Oct 2022 07:07:28 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BFDD0C433C1; Mon, 10 Oct 2022 07:07:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1665385647; bh=E44DQ4Za03GQzbvMam2sCoX3jPZyCievlyAL0u9o1Zc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=S+PC0lsL2MmrWcbIreLDOVjjuO5I8x/e12TEPXB1ZjTPllAOcCqeDj+yzBSXzIGuc N7My4T2OfHjg3RF1qtJ+6majQMaqSBy6KHKxAD8TsYPlNDZXahj1Y3SvUPpJ+hhq7V 2J9zuMQSzGhdrl3n58pUsz2q+k1eEiZAcGFHLhww= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, kernel test robot , Dan Carpenter , Janis Schoetterl-Glausch , Claudio Imbrenda , Christian Borntraeger , Janosch Frank , Sasha Levin Subject: [PATCH 5.19 28/48] KVM: s390: Pass initialized arg even if unused Date: Mon, 10 Oct 2022 09:05:26 +0200 Message-Id: <20221010070334.431830252@linuxfoundation.org> X-Mailer: git-send-email 2.38.0 In-Reply-To: <20221010070333.676316214@linuxfoundation.org> References: <20221010070333.676316214@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Janis Schoetterl-Glausch [ Upstream commit b3cefd6bf16e7234ffbd4209f6083060f4e35f59 ] This silences smatch warnings reported by kbuild bot: arch/s390/kvm/gaccess.c:859 guest_range_to_gpas() error: uninitialized symbol 'prot'. arch/s390/kvm/gaccess.c:1064 access_guest_with_key() error: uninitialized symbol 'prot'. This is because it cannot tell that the value is not used in this case. The trans_exc* only examine prot if code is PGM_PROTECTION. Pass a dummy value for other codes. Reported-by: kernel test robot Reported-by: Dan Carpenter Signed-off-by: Janis Schoetterl-Glausch Reviewed-by: Claudio Imbrenda Link: https://lore.kernel.org/r/20220825192540.1560559-1-scgl@linux.ibm.com Signed-off-by: Christian Borntraeger Signed-off-by: Janosch Frank Signed-off-by: Sasha Levin --- arch/s390/kvm/gaccess.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/arch/s390/kvm/gaccess.c b/arch/s390/kvm/gaccess.c index 227ed0009354..0e82bf85e59b 100644 --- a/arch/s390/kvm/gaccess.c +++ b/arch/s390/kvm/gaccess.c @@ -489,6 +489,8 @@ enum prot_type { PROT_TYPE_ALC = 2, PROT_TYPE_DAT = 3, PROT_TYPE_IEP = 4, + /* Dummy value for passing an initialized value when code != PGM_PROTECTION */ + PROT_NONE, }; static int trans_exc_ending(struct kvm_vcpu *vcpu, int code, unsigned long gva, u8 ar, @@ -504,6 +506,10 @@ static int trans_exc_ending(struct kvm_vcpu *vcpu, int code, unsigned long gva, switch (code) { case PGM_PROTECTION: switch (prot) { + case PROT_NONE: + /* We should never get here, acts like termination */ + WARN_ON_ONCE(1); + break; case PROT_TYPE_IEP: tec->b61 = 1; fallthrough; @@ -968,8 +974,10 @@ static int guest_range_to_gpas(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar, return rc; } else { gpa = kvm_s390_real_to_abs(vcpu, ga); - if (kvm_is_error_gpa(vcpu->kvm, gpa)) + if (kvm_is_error_gpa(vcpu->kvm, gpa)) { rc = PGM_ADDRESSING; + prot = PROT_NONE; + } } if (rc) return trans_exc(vcpu, rc, ga, ar, mode, prot); @@ -1112,8 +1120,6 @@ int access_guest_with_key(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar, if (rc == PGM_PROTECTION && try_storage_prot_override) rc = access_guest_page_with_key(vcpu->kvm, mode, gpas[idx], data, fragment_len, PAGE_SPO_ACC); - if (rc == PGM_PROTECTION) - prot = PROT_TYPE_KEYC; if (rc) break; len -= fragment_len; @@ -1123,6 +1129,10 @@ int access_guest_with_key(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar, if (rc > 0) { bool terminate = (mode == GACC_STORE) && (idx > 0); + if (rc == PGM_PROTECTION) + prot = PROT_TYPE_KEYC; + else + prot = PROT_NONE; rc = trans_exc_ending(vcpu, rc, ga, ar, mode, prot, terminate); } out_unlock: -- 2.35.1