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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 31904CF65DB for ; Mon, 26 Jan 2026 12:17:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=ZJU6h7G/eUm2vepqJIQCiCT70FfImRuAPUvsxAyVCnc=; b=eYE2DacgNl0YV28e6zS4p8XnL3 EEXDKlyeO8s7K++ql4M1nx2QCmkj39ikZtvMep7iZCn8W3mHhNBwa9fHX/f2/sl2PNtXwVyC0hTMd ZXusOnXDEledl4AwAhu0MZy2oZu4QunSEP3iu6wwUFYbjDQCvAoq/6YCpLURWGKHF7vkonfKpowi+ fbu7x08Fs9PyyU+QWSWeIK65S4lJiwp+QHNLBkzG0euHb9gbEvpjH9gq0RhfLPVRfyloBpqnCdjOg P47RDYdfVKgAStNEBbXBoIQozastNL/y1JYmzcsUjYqHLvetMq5/uW5xkUD1GJ9N2kJXzIUhqNArS R/ozMprw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vkLXR-0000000CV1E-3E2H; Mon, 26 Jan 2026 12:17:49 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vkLXE-0000000CUsH-1MHe for linux-arm-kernel@lists.infradead.org; Mon, 26 Jan 2026 12:17:37 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 3E72044481; Mon, 26 Jan 2026 12:17:35 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1E827C2BC87; Mon, 26 Jan 2026 12:17:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1769429855; bh=cjSjGxnYioTuTQkGGQeoMXFPLKV/lqjRqjCssEI4KVc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lynbX/MKrusm4/GddjW2C1EcTeaJQuHw8aiCSS7Qb59DG6haFmWjqQv91Lne9rOhP Xm18Ia8UBL0QVFeo1MfGDe9D8Lwyf8SXJH/WRy0VR/DKFE/5yW7OaVrnKc7M1H5fAG Fu0GoabENZb4J/VHE6F1CDaQ4ehq0QWkWTi/BFZJhtW7kIv7ler9nUPwTSrRcqhKRx dnEKDXMz1SnjJQjSNYriyxl5pRJw4kYydCYPwQLevyeSyDhUSyXsDEH7BrZudkIxGH X5MsVIOYwrWag99XWz8r9hSQxBY+pilf79P3e5Jhdt+mGIN/sgPLv/fLteN5azlCD5 LOUN+L8P/YP2g== Received: from sofa.misterjones.org ([185.219.108.64] helo=valley-girl.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1vkLXB-00000005hx6-1Ahu; Mon, 26 Jan 2026 12:17:33 +0000 From: Marc Zyngier To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org Cc: Joey Gouly , Suzuki K Poulose , Oliver Upton , Zenghui Yu , Fuad Tabba , Will Deacon , Catalin Marinas Subject: [PATCH 07/20] KVM: arm64: Allow RES1 bits to be inferred from configuration Date: Mon, 26 Jan 2026 12:16:41 +0000 Message-ID: <20260126121655.1641736-8-maz@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260126121655.1641736-1-maz@kernel.org> References: <20260126121655.1641736-1-maz@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, joey.gouly@arm.com, suzuki.poulose@arm.com, oupton@kernel.org, yuzenghui@huawei.com, tabba@google.com, will@kernel.org, catalin.marinas@arm.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260126_041736_411622_0B39893F X-CRM114-Status: GOOD ( 13.63 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org So far, when a bit field is tied to an unsupported feature, we set it as RES0. This is almost forrect, but there are a few exceptions where the bits become RES1. Add a AS_RES1 qualifier that instruct the RESx computing code to simply do that. Signed-off-by: Marc Zyngier --- arch/arm64/kvm/config.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kvm/config.c b/arch/arm64/kvm/config.c index 8d152605999ba..6a4674fabf865 100644 --- a/arch/arm64/kvm/config.c +++ b/arch/arm64/kvm/config.c @@ -24,6 +24,7 @@ struct reg_bits_to_feat_map { #define CALL_FUNC BIT(1) /* Needs to evaluate tons of crap */ #define FIXED_VALUE BIT(2) /* RAZ/WI or RAO/WI in KVM */ #define MASKS_POINTER BIT(3) /* Pointer to fgt_masks struct instead of bits */ +#define AS_RES1 BIT(4) /* RES1 when not supported */ unsigned long flags; @@ -1316,8 +1317,12 @@ struct resx __compute_fixed_bits(struct kvm *kvm, else match = idreg_feat_match(kvm, &map[i]); - if (!match || (map[i].flags & FIXED_VALUE)) - resx.res0 |= reg_feat_map_bits(&map[i]); + if (!match || (map[i].flags & FIXED_VALUE)) { + if (map[i].flags & AS_RES1) + resx.res1 |= reg_feat_map_bits(&map[i]); + else + resx.res0 |= reg_feat_map_bits(&map[i]); + } } return resx; -- 2.47.3