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 X-Spam-Level: X-Spam-Status: No, score=-17.0 required=3.0 tests=BAYES_00,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A804AC47E48 for ; Thu, 15 Jul 2021 16:54:03 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 411CB613FB for ; Thu, 15 Jul 2021 16:54:03 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 411CB613FB Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvmarm-bounces@lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id E7BAE4B097; Thu, 15 Jul 2021 12:54:02 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wm9+QkXDOcjU; Thu, 15 Jul 2021 12:54:01 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id D05164B09A; Thu, 15 Jul 2021 12:54:01 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id D44FF4B08D for ; Thu, 15 Jul 2021 12:54:00 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id c1zBnWXr-p0m for ; Thu, 15 Jul 2021 12:53:59 -0400 (EDT) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 37B104B08A for ; Thu, 15 Jul 2021 12:53:59 -0400 (EDT) Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 84887613E9; Thu, 15 Jul 2021 16:53:58 +0000 (UTC) Received: from sofa.misterjones.org ([185.219.108.64] helo=why.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1m44Hb-00DYjr-4J; Thu, 15 Jul 2021 17:32:19 +0100 From: Marc Zyngier To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 13/16] arm64: Implement ioremap/iounmap hooks calling into KVM's MMIO guard Date: Thu, 15 Jul 2021 17:31:56 +0100 Message-Id: <20210715163159.1480168-14-maz@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210715163159.1480168-1-maz@kernel.org> References: <20210715163159.1480168-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, will@kernel.org, qperret@google.com, dbrazdil@google.com, vatsa@codeaurora.org, sdonthineni@nvidia.com, james.morse@arm.com, suzuki.poulose@arm.com, alexandru.elisei@arm.com, kernel-team@android.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Cc: kernel-team@android.com, Srivatsa Vaddagiri , Shanker R Donthineni , will@kernel.org X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu Implement the previously defined ioremap/iounmap hooks for arm64, calling into KVM's MMIO guard if available. Signed-off-by: Marc Zyngier --- arch/arm64/mm/ioremap.c | 56 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) diff --git a/arch/arm64/mm/ioremap.c b/arch/arm64/mm/ioremap.c index b7c81dacabf0..0801fd92f0e3 100644 --- a/arch/arm64/mm/ioremap.c +++ b/arch/arm64/mm/ioremap.c @@ -9,13 +9,69 @@ * Copyright (C) 2012 ARM Ltd. */ +#define pr_fmt(fmt) "ioremap: " fmt + #include #include #include #include +#include #include #include +#include + +static DEFINE_STATIC_KEY_FALSE(ioremap_guard_key); + +void ioremap_page_range_hook(unsigned long addr, unsigned long end, + phys_addr_t phys_addr, pgprot_t prot) +{ + size_t size = end - addr; + + if (!static_branch_unlikely(&ioremap_guard_key)) + return; + + if (pfn_valid(__phys_to_pfn(phys_addr))) + return; + + while (size) { + struct arm_smccc_res res; + + arm_smccc_1_1_hvc(ARM_SMCCC_VENDOR_HYP_KVM_MMIO_GUARD_MAP_FUNC_ID, + phys_addr, prot, &res); + if (res.a0 != SMCCC_RET_SUCCESS) { + pr_warn_ratelimited("Failed to register %llx\n", + phys_addr); + return; + } + + size -= PAGE_SIZE; + phys_addr += PAGE_SIZE; + } +} + +void iounmap_page_range_hook(phys_addr_t phys_addr, size_t size) +{ + if (!static_branch_unlikely(&ioremap_guard_key)) + return; + + VM_BUG_ON(phys_addr & ~PAGE_MASK || size & ~PAGE_MASK); + + while (size) { + struct arm_smccc_res res; + + arm_smccc_1_1_hvc(ARM_SMCCC_VENDOR_HYP_KVM_MMIO_GUARD_UNMAP_FUNC_ID, + phys_addr, &res); + if (res.a0 != SMCCC_RET_SUCCESS) { + pr_warn_ratelimited("Failed to unregister %llx\n", + phys_addr); + return; + } + + size -= PAGE_SIZE; + phys_addr += PAGE_SIZE; + } +} static void __iomem *__ioremap_caller(phys_addr_t phys_addr, size_t size, pgprot_t prot, void *caller) -- 2.30.2 _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm