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 0B255C9830E for ; Fri, 25 Sep 2026 10:42:35 +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:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=P6B6YHE9Kqd70sRr1HxlKQ1mQuHMXP6sdRfwXJg5Gm0=; b=qapZiOGQam2xRTzATwCSi5cJSe z3NRo1i6D//HOgVlQA1ogvWOjiWFo8kYlE0BdCMxLgg0XUelX0yNzmwE142RDfFwaL/7OVE8Q/Bx3 zqQshFgupNlg5wE3t0gQl5L+TUxEQFM8RvwlLJxRbj+TGO3h2NGTsqvP6ZMqHdpxl/nNzbJpgngfW eB7CJljcWlvjY1i423NfPKvG7u4LEAzZpNbAFCt/jHvUDCVL4dBHUoMAVsLKn3GPzE+7NSvxb/Hpu p8logsYj5H94NiBtEolxp/E5YN0QY7PRoS7MAU2svttmOP71BgZspH8QRlD6DiGf55G3ckRCPSKXS u5REREjg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xA3Nt-0000000D7Ss-0duy; Fri, 25 Sep 2026 10:42:29 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xA3Np-0000000D7S7-0OZq for linux-arm-kernel@lists.infradead.org; Fri, 25 Sep 2026 10:42:27 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 5592A169C; Fri, 25 Sep 2026 03:42:20 -0700 (PDT) Received: from arm.com (usa-sjc-mx-foss1.foss.arm.com [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 768373F86F; Fri, 25 Sep 2026 03:42:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1790332943; bh=UUyhn4ypefH8nO4Rrn4P6xc3nFeWoLuAA1eQpSu4Akc=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=YDM+yiyKthxFhTKEmv9i+I4SBvhmEM/1ix0t1Zi4BCJYjZJ4kcAmvy299BLpzlw3y cT6K+p2MVhx1f4Q9XiRhkD/OVCLxnl59uvS2/1JEPvzvgn9q/QBtQqw3QYM9pQeWcg VoHtTvnvMrACrhnlvDU4LlnhgXJ3vauae0k3g6DE= Date: Fri, 25 Sep 2026 11:42:18 +0100 From: Catalin Marinas To: Suzuki K Poulose Cc: kvm@vger.kernel.org, kvmarm@lists.linux.dev, maz@kernel.org, will@kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, steven.price@arm.com, aneesh.kumar@kernel.org, oupton@kernel.org, gshan@redhat.com, joey.gouly@arm.com, tabba@google.com, yuzenghui@huawei.com, linux-coco@lists.linux.dev, gankulkarni@os.amperecomputing.com, sdonthineni@nvidia.com, alpergun@google.com, fj0570is@fujitsu.com, WeiLin.Chang@arm.com, lpieralisi@kernel.org, enju.kohei@fujitsu.com, sudeep.holla@arm.com, jonathan.cameron@oss.qualcomm.com Subject: Re: [PATCH v19 2/7] firmware: arm_rmm: Check for RMI support at init Message-ID: References: <20260924135201.850038-1-suzuki.poulose@arm.com> <20260924135201.850038-3-suzuki.poulose@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260924135201.850038-3-suzuki.poulose@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260925_034225_181350_F6FE546D X-CRM114-Status: UNSURE ( 9.88 ) X-CRM114-Notice: Please train this message. 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 On Thu, Sep 24, 2026 at 02:51:56PM +0100, Suzuki K Poulose wrote: > diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c > index 32102c3912fa7..e8b29983b0021 100644 > --- a/arch/arm64/kernel/cpufeature.c > +++ b/arch/arm64/kernel/cpufeature.c > @@ -293,6 +293,7 @@ static const struct arm64_ftr_bits ftr_id_aa64isar3[] = { > static const struct arm64_ftr_bits ftr_id_aa64pfr0[] = { > ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_CSV3_SHIFT, 4, 0), > ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_CSV2_SHIFT, 4, 0), > + ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR0_EL1_RME_SHIFT, 4, 0), I think we end up exposing this to (any) guest unless we mask it out in sanitise_id_aa64dfr0_el1(). Do the guests care about the RME version? I don't think they should, especially the non-realm ones. For nested it's masked away already (limit_nv_id_reg()). -- Catalin