From patchwork Mon Sep 18 06:57:35 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ryan Roberts X-Patchwork-Id: 13388882 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 5CC18C46CA1 for ; Mon, 18 Sep 2023 06:58:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=rqcE9lvs5r7iGCZCMW8x1nMgEVHrSLpJADEvaFqxoYM=; b=5DIozgUnT2uHlq WrKr29V3qO9p9ut5BSzXir7R3HD2vvpQujmqI0x/d5v9pJ8LN2xbPy/MgUC0v42AN+IgCmVq0ZrJf rS8G65mhvODXS7VGyAsGdPlAy86LBGUE8i8SIqYbO4tGx1FD/EQ273nU53lxlCLxqlQeiZyZzGJCU C/Y7yTjR/KjHiExPE12c7VXT0IlqcDRWxlLtvwIa98D9gOg+PyDrFo2XqJxm5flpO7vpW9SCHFNi+ +1AOTh2AATTF9Cp8Ri5oDxy9ABDWuZljHvQv8rCD2TWfnm2yzeLQtaDUcR//MfWP6Pex/ac7UZVd1 ToP73RMQOMpPz8Vg6b0A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qi8D8-00EbBZ-1v; Mon, 18 Sep 2023 06:58:22 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qi8Cx-00Eb4E-0H for linux-arm-kernel@lists.infradead.org; Mon, 18 Sep 2023 06:58:12 +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 336BE1474; Sun, 17 Sep 2023 23:58:45 -0700 (PDT) Received: from e125769.cambridge.arm.com (e125769.cambridge.arm.com [10.1.196.26]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 2F9BF3F5A1; Sun, 17 Sep 2023 23:58:06 -0700 (PDT) From: Ryan Roberts To: Catalin Marinas , Will Deacon , Marc Zyngier , Oliver Upton , Suzuki K Poulose , James Morse , Zenghui Yu , Ard Biesheuvel , Anshuman Khandual Cc: Ryan Roberts , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev Subject: [PATCH v3 08/13] KVM: arm64: Insert PS field at TCR_EL2 assembly time Date: Mon, 18 Sep 2023 07:57:35 +0100 Message-Id: <20230918065740.3670662-9-ryan.roberts@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230918065740.3670662-1-ryan.roberts@arm.com> References: <20230918065740.3670662-1-ryan.roberts@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230917_235811_169584_77B1E332 X-CRM114-Status: GOOD ( 13.71 ) 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 With the addition of LPA2 support in the hypervisor, the PA size supported by the HW must be capped with a runtime decision, rather than simply using a compile-time decision based on PA_BITS. For example, on a system that advertises 52 bit PA but does not support FEAT_LPA2, A 4KB or 16KB kernel compiled with LPA2 support must still limit the PA size to 48 bits. Therefore, move the insertion of the PS field into TCR_EL2 out of __kvm_hyp_init assembly code and instead do it in cpu_prepare_hyp_mode() where the rest of TCR_EL2 is assembled. This allows us to figure out PS with kvm_get_parange(), which has the appropriate logic to ensure the above requirement. (and the PS field of VTCR_EL2 is already populated this way). Signed-off-by: Ryan Roberts --- arch/arm64/kvm/arm.c | 2 ++ arch/arm64/kvm/hyp/nvhe/hyp-init.S | 4 ---- 2 files changed, 2 insertions(+), 4 deletions(-) diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 73cc67c2a8a7..fa30522cc935 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -1726,6 +1726,7 @@ static void __init cpu_prepare_hyp_mode(int cpu, u32 hyp_va_bits) { struct kvm_nvhe_init_params *params = per_cpu_ptr_nvhe_sym(kvm_init_params, cpu); unsigned long tcr; + u64 mmfr0 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1); /* * Calculate the raw per-cpu offset without a translation from the @@ -1747,6 +1748,7 @@ static void __init cpu_prepare_hyp_mode(int cpu, u32 hyp_va_bits) } tcr &= ~TCR_T0SZ_MASK; tcr |= TCR_T0SZ(hyp_va_bits); + tcr |= kvm_get_parange(mmfr0) << TCR_EL2_PS_SHIFT; if (system_supports_lpa2()) tcr |= TCR_EL2_DS; params->tcr_el2 = tcr; diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-init.S b/arch/arm64/kvm/hyp/nvhe/hyp-init.S index 90fade1b032e..a0d7bc384404 100644 --- a/arch/arm64/kvm/hyp/nvhe/hyp-init.S +++ b/arch/arm64/kvm/hyp/nvhe/hyp-init.S @@ -121,11 +121,7 @@ alternative_if ARM64_HAS_CNP alternative_else_nop_endif msr ttbr0_el2, x2 - /* - * Set the PS bits in TCR_EL2. - */ ldr x0, [x0, #NVHE_INIT_TCR_EL2] - tcr_compute_pa_size x0, #TCR_EL2_PS_SHIFT, x1, x2 msr tcr_el2, x0 isb