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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1CA26C4332F for ; Mon, 4 Oct 2021 17:57:13 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id C26036126A for ; Mon, 4 Oct 2021 17:57:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org C26036126A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 703634B2A7; Mon, 4 Oct 2021 13:57:12 -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 jIYquw95RTNg; Mon, 4 Oct 2021 13:57:11 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 2D2824B2C2; Mon, 4 Oct 2021 13:57:11 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id ED2AE4B26B for ; Mon, 4 Oct 2021 13:57:09 -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 4GLIFD9ZQFMO for ; Mon, 4 Oct 2021 13:57:09 -0400 (EDT) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 3BBFE4B299 for ; Mon, 4 Oct 2021 13:57:08 -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 9125D61216; Mon, 4 Oct 2021 17:57:07 +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 1mXS5I-00EhBv-9N; Mon, 04 Oct 2021 18:49:04 +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 v2 14/16] arm64: Enroll into KVM's MMIO guard if required Date: Mon, 4 Oct 2021 18:48:47 +0100 Message-Id: <20211004174849.2831548-15-maz@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211004174849.2831548-1-maz@kernel.org> References: <20211004174849.2831548-1-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, steven.price@arm.com, drjones@redhat.com, tabba@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 , Steven Price , 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 Should a guest desire to enroll into the MMIO guard, allow it to do so with a command-line option. Signed-off-by: Marc Zyngier --- .../admin-guide/kernel-parameters.txt | 3 ++ arch/arm64/Kconfig | 1 + arch/arm64/include/asm/hypervisor.h | 1 + arch/arm64/kernel/setup.c | 6 +++ arch/arm64/mm/ioremap.c | 38 +++++++++++++++++++ 5 files changed, 49 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 91ba391f9b32..62bb25b412a7 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -2076,6 +2076,9 @@ 1 - Bypass the IOMMU for DMA. unset - Use value of CONFIG_IOMMU_DEFAULT_PASSTHROUGH. + ioremap_guard [ARM64] enable the KVM MMIO guard functionality + if available. + io7= [HW] IO7 for Marvel-based Alpha systems See comment before marvel_specify_io7 in arch/alpha/kernel/core_marvel.c. diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 5c7ae4c3954b..4982d21d3c47 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -25,6 +25,7 @@ config ARM64 select ARCH_HAS_FORTIFY_SOURCE select ARCH_HAS_GCOV_PROFILE_ALL select ARCH_HAS_GIGANTIC_PAGE + select ARCH_HAS_IOREMAP_PHYS_HOOKS select ARCH_HAS_KCOV select ARCH_HAS_KEEPINITRD select ARCH_HAS_MEMBARRIER_SYNC_CORE diff --git a/arch/arm64/include/asm/hypervisor.h b/arch/arm64/include/asm/hypervisor.h index 8e77f411903f..b130c7b82eaa 100644 --- a/arch/arm64/include/asm/hypervisor.h +++ b/arch/arm64/include/asm/hypervisor.h @@ -7,5 +7,6 @@ void kvm_init_hyp_services(void); bool kvm_arm_hyp_service_available(u32 func_id); void kvm_arm_init_hyp_services(void); +void kvm_init_ioremap_services(void); #endif diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index be5f85b0a24d..c325647f675f 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -49,6 +49,7 @@ #include #include #include +#include #include #include @@ -445,3 +446,8 @@ static int __init register_arm64_panic_block(void) return 0; } device_initcall(register_arm64_panic_block); + +void kvm_arm_init_hyp_services(void) +{ + kvm_init_ioremap_services(); +} diff --git a/arch/arm64/mm/ioremap.c b/arch/arm64/mm/ioremap.c index 5334cbdc9f64..62b715ea31e5 100644 --- a/arch/arm64/mm/ioremap.c +++ b/arch/arm64/mm/ioremap.c @@ -30,6 +30,44 @@ static DEFINE_STATIC_KEY_FALSE(ioremap_guard_key); static DEFINE_XARRAY(ioremap_guard_array); static DEFINE_MUTEX(ioremap_guard_lock); +static bool ioremap_guard; +static int __init ioremap_guard_setup(char *str) +{ + ioremap_guard = true; + + return 0; +} +early_param("ioremap_guard", ioremap_guard_setup); + +void kvm_init_ioremap_services(void) +{ + struct arm_smccc_res res; + + if (!ioremap_guard) + return; + + /* We need all the functions to be implemented */ + if (!kvm_arm_hyp_service_available(ARM_SMCCC_KVM_FUNC_MMIO_GUARD_INFO) || + !kvm_arm_hyp_service_available(ARM_SMCCC_KVM_FUNC_MMIO_GUARD_ENROLL) || + !kvm_arm_hyp_service_available(ARM_SMCCC_KVM_FUNC_MMIO_GUARD_MAP) || + !kvm_arm_hyp_service_available(ARM_SMCCC_KVM_FUNC_MMIO_GUARD_UNMAP)) + return; + + arm_smccc_1_1_invoke(ARM_SMCCC_VENDOR_HYP_KVM_MMIO_GUARD_INFO_FUNC_ID, + &res); + if (res.a0 != PAGE_SIZE) + return; + + arm_smccc_1_1_invoke(ARM_SMCCC_VENDOR_HYP_KVM_MMIO_GUARD_ENROLL_FUNC_ID, + &res); + if (res.a0 == SMCCC_RET_SUCCESS) { + static_branch_enable(&ioremap_guard_key); + pr_info("Using KVM MMIO guard for ioremap\n"); + } else { + pr_warn("KVM MMIO guard registration failed (%ld)\n", res.a0); + } +} + void ioremap_phys_range_hook(phys_addr_t phys_addr, size_t size, pgprot_t prot) { if (!static_branch_unlikely(&ioremap_guard_key)) -- 2.30.2 _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm