From patchwork Mon Sep 18 06:57:38 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ryan Roberts X-Patchwork-Id: 13388886 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 A323FC46CA1 for ; Mon, 18 Sep 2023 06:58:51 +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=oJyYV8CizquBOHKIz7JLc4E41A/xJJaEe4Z4/dJ8XPA=; b=BJlgaBApZCE5V5 uoqCbkgXjXfouK77ioygmWTYbwQkRMbjCWowML83iPpjlc2rUznePvV27igo+buytXCk84elLzD93 bN7YdJwNcb69xHh2/awrR/+IKxuUJMRwu47OhUH2ZpN7SE6v1k2fCWBAXfWAt4cHaL+v74EBQFNL2 VckGjwwRjYhvqVYASxXN/q7v2nfJREsRPwfnUq9X9R8avXorcwZujtAa7mkOZF5Gea1IWlTCxgons n3JX66H8C8R8r1CBgVt7MvnoYi28HWlz/gtm1WfTXQFRrR5hkHXVp6rYXu+QtOqa8O4PxPbfDhery wiJAJXPUCh3qTq0B/i+g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qi8DA-00EbDb-1t; Mon, 18 Sep 2023 06:58:24 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qi8D0-00Eb4E-0v for linux-arm-kernel@lists.infradead.org; Mon, 18 Sep 2023 06:58:16 +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 393DD1474; Sun, 17 Sep 2023 23:58:51 -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 3517B3F5A1; Sun, 17 Sep 2023 23:58:12 -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 11/13] KVM: arm64: Allow guests with >48-bit IPA size on FEAT_LPA2 systems Date: Mon, 18 Sep 2023 07:57:38 +0100 Message-Id: <20230918065740.3670662-12-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_235814_367305_B8F21DFD X-CRM114-Status: GOOD ( 11.14 ) 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 all the page-table infrastructure in place, we can finally increase the maximum permisable IPA size to 52-bits on 4KB and 16KB page systems that have FEAT_LPA2. Signed-off-by: Ryan Roberts --- arch/arm64/kvm/reset.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c index 7a65a35ee4ac..7816c64d4701 100644 --- a/arch/arm64/kvm/reset.c +++ b/arch/arm64/kvm/reset.c @@ -316,12 +316,11 @@ int __init kvm_set_ipa_limit(void) parange = cpuid_feature_extract_unsigned_field(mmfr0, ID_AA64MMFR0_EL1_PARANGE_SHIFT); /* - * IPA size beyond 48 bits could not be supported - * on either 4K or 16K page size. Hence let's cap - * it to 48 bits, in case it's reported as larger - * on the system. + * IPA size beyond 48 bits for 4K and 16K page size is only supported + * when LPA2 is available. So if we have LPA2, enable it, else cap to 48 + * bits, in case it's reported as larger on the system. */ - if (PAGE_SIZE != SZ_64K) + if (!system_supports_lpa2() && PAGE_SIZE != SZ_64K) parange = min(parange, (unsigned int)ID_AA64MMFR0_EL1_PARANGE_48); /*