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 6405FE7DF1A for ; Mon, 2 Feb 2026 18:43:57 +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=oRI/B/GoKl92b3Dkm7sYt2IlxKyb1B9+rndzxArwjwY=; b=NcaWjNn0WslcGhoMDGCOUN4YF5 zG+vTMWVKk06E/6WeKAbaONFRRbQmoVQAX6GKca9v2ICHsQgV2gePOMIAuSuPWurJpIRyxX1SRK6i GUpFNrxVi9j+x0BHUk4PTyZYQMimkSImRaE6eX3JRb6XpFsmqA5V+fg5jrr0p/qyCtvyov1qIl0JS KbjX+/ZlrO2ubQ2uty8cGje10fuwWYCwUca6vK5BKLA3N4VfwpBs2YfANQVcZBblg+ynJMCZhkbuG cso0dgiJ6G1E6lcKZ4AlPrbdxgWBJar93NsOUknflhH7lOR/yovyKx/vpdlYNDMDfE1mPjFRu1pQ4 dVVOF4fA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vmyts-00000005RA8-0WHG; Mon, 02 Feb 2026 18:43:52 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vmytj-00000005QzI-2i2n for linux-arm-kernel@lists.infradead.org; Mon, 02 Feb 2026 18:43:45 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 479CD44445; Mon, 2 Feb 2026 18:43:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2117FC2BC87; Mon, 2 Feb 2026 18:43:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770057822; bh=5WRJ9oOXrDJEL69hkNzTU0wxUvuUyWon3NrR6orDMyw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uwPWw5v/fHMuZzVX/pKPNvaC5m6Hbp+9W88GsIZUeuGP97ac6sSDcK+JDUet49QQy h039DI2NRxWyIg23TAtz6rbmk4NbtzWMCi/FODdLwh1ZOpy1wWb7fatOHX77QuQ7D9 PFExbJCeOQjsU8bxeiEyZn3MZvVpuvZ4RbFxLHkxXpznYy3RQbNTwNdjSeTgDoJ7fx /Sn/aLaSoBw6FalnDyG2lPXa+42Vxiap8hhgnaLviISCI0A/jzH+Prbre6tjgU1Sps wijzTb0Qd6sig9S5pNrZ5URrDXcKV3I9BsnBhR3xk1Q4GezG+dfvT/mdrBlBqI5wq/ 4liuv3Hq4//3Q== 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 1vmytg-00000007sAy-1OCL; Mon, 02 Feb 2026 18:43:40 +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 v2 07/20] KVM: arm64: Allow RES1 bits to be inferred from configuration Date: Mon, 2 Feb 2026 18:43:16 +0000 Message-ID: <20260202184329.2724080-8-maz@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260202184329.2724080-1-maz@kernel.org> References: <20260202184329.2724080-1-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-20260202_104343_739248_CC156559 X-CRM114-Status: GOOD ( 14.49 ) 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 correct, 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. Reviewed-by: Joey Gouly Reviewed-by: Fuad Tabba 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 9ad7eb5f4b981..bc8e6460c3fb1 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; @@ -1315,8 +1316,12 @@ static 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