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 7D263E63C8C for ; Mon, 2 Feb 2026 18:44:07 +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=Li/gbhn2JCn0D0Ifg0lm6nhWOlmNoBVuLJWakHpqNmQ=; b=X/mJxJu6D34pExapDdfLZ1dDTq NpLs46xOL3C3dQ66IVvvqpc3XIV7vWunfPBJ5orgvf2AJ6gOfSgEnLoA8HzhyZakAWbODo5/6ppPz 5aBWjuDzFual4J59kXUXRo+jrhz8omkqQLF1BRZa9Nmi8nr7vMvzb23PlSrxwtnoqNamtuoOa3rQP FCx07h2/6Viykc+cIPI5r2yg/dWuiU+0YwKl+EioBLfX6k95rxiKbn97R2YdMGtKMNK9pK3EVGehK +kN94jFajNhmrPhifDOcdFX+FqUxRKMS09YjqazemW01RsYNLaNmnn426qoT+/q5Cee7nBrH7HDOh 1jWDOLgA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vmyu0-00000005RME-13nB; Mon, 02 Feb 2026 18:44:00 +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 1vmytk-00000005QzH-3leo for linux-arm-kernel@lists.infradead.org; Mon, 02 Feb 2026 18:43:47 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 09C9C43713; Mon, 2 Feb 2026 18:43:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D6A7FC2BC86; Mon, 2 Feb 2026 18:43:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770057823; bh=dkRNnZvotmXRB/vj0OlRDTCSt4bIScd43i7BNBYwMwE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Msu0h31e8XpNNom4YOWsQP8CdQpY2GxdLi0l9hkeEVElVUFyWWA0lP0FVGIko3y3F FsP+e7R4yrXGrSLRNYYQuur/oFE+trrp+HIOAlxByxwKU74w8+pwgkKAehHt8d/LW6 wwiT3EekUJQB/69BLqFU7ofATQFnGzZPqODKWnOELiQgFl3tRrSb2kiYiYDA0l5ysA FMI3j7MVgrdVxXa5P0T4aFb0UipajMS3GFq685BPi0+mjHdkUSZYE2K2wDWgb2YgbB zWinAA4y76pbsIDvhHISWbWv7PdU3zAFBG4zncXIChrUC0HKdgJ2zdbUmPTFr7r4AF WtoRM4daO14Kw== 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 1vmyth-00000007sAy-3pZl; Mon, 02 Feb 2026 18:43:42 +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 14/20] KVM: arm64: Simplify handling of HCR_EL2.E2H RESx Date: Mon, 2 Feb 2026 18:43:23 +0000 Message-ID: <20260202184329.2724080-15-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_104345_000640_B90E4E3C X-CRM114-Status: GOOD ( 11.06 ) 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 Now that we can link the RESx behaviour with the value of HCR_EL2.E2H, we can trivially express the tautological constraint that makes E2H a reserved value at all times. Fun, isn't it? Reviewed-by: Fuad Tabba Signed-off-by: Marc Zyngier --- arch/arm64/kvm/config.c | 12 +----------- 1 file changed, 1 insertion(+), 11 deletions(-) diff --git a/arch/arm64/kvm/config.c b/arch/arm64/kvm/config.c index 474d5c8038c24..ae72f3b8e50b1 100644 --- a/arch/arm64/kvm/config.c +++ b/arch/arm64/kvm/config.c @@ -388,16 +388,6 @@ static bool feat_vmid16(struct kvm *kvm) return kvm_has_feat_enum(kvm, ID_AA64MMFR1_EL1, VMIDBits, 16); } -static bool compute_hcr_e2h(struct kvm *kvm, struct resx *bits) -{ - if (kvm_has_feat(kvm, FEAT_E2H0)) - bits->res0 |= HCR_EL2_E2H; - else - bits->res1 |= HCR_EL2_E2H; - - return true; -} - static const struct reg_bits_to_feat_map hfgrtr_feat_map[] = { NEEDS_FEAT(HFGRTR_EL2_nAMAIR2_EL1 | HFGRTR_EL2_nMAIR2_EL1, @@ -1017,7 +1007,7 @@ static const struct reg_bits_to_feat_map hcr_feat_map[] = { NEEDS_FEAT(HCR_EL2_TWEDEL | HCR_EL2_TWEDEn, FEAT_TWED), - NEEDS_FEAT_FIXED(HCR_EL2_E2H, compute_hcr_e2h), + NEEDS_FEAT_FLAG(HCR_EL2_E2H, RES1_WHEN_E2H1 | FORCE_RESx), FORCE_RES0(HCR_EL2_RES0), FORCE_RES1(HCR_EL2_RES1), }; -- 2.47.3