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,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 9A0DBC433FE for ; Thu, 10 Dec 2020 16:00:37 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 06A6323E22 for ; Thu, 10 Dec 2020 16:00:36 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 06A6323E22 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 82F3F4B1C7; Thu, 10 Dec 2020 11:00:36 -0500 (EST) 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 krVhMCZ0YrrE; Thu, 10 Dec 2020 11:00:36 -0500 (EST) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id C98004B1DD; Thu, 10 Dec 2020 11:00:34 -0500 (EST) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 5980D4B126 for ; Thu, 10 Dec 2020 11:00:33 -0500 (EST) 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 IEdl3UU5XwmF for ; Thu, 10 Dec 2020 11:00:32 -0500 (EST) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 134D14B17A for ; Thu, 10 Dec 2020 11:00:32 -0500 (EST) 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 2E29C23D56; Thu, 10 Dec 2020 16:00:31 +0000 (UTC) Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=why.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94) (envelope-from ) id 1knOMm-0008Di-Ny; Thu, 10 Dec 2020 16:00:29 +0000 From: Marc Zyngier To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Subject: [PATCH v3 01/66] arm64: Add ARM64_HAS_NESTED_VIRT cpufeature Date: Thu, 10 Dec 2020 15:58:57 +0000 Message-Id: <20201210160002.1407373-2-maz@kernel.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201210160002.1407373-1-maz@kernel.org> References: <20201210160002.1407373-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, andre.przywara@arm.com, christoffer.dall@arm.com, jintack@cs.columbia.edu, alexandru.elisei@arm.com, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com, kernel-team@android.com, jintack.lim@linaro.org 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, Andre Przywara , Jintack Lim 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 From: Jintack Lim Add a new ARM64_HAS_NESTED_VIRT feature to indicate that the CPU has the ARMv8.3 nested virtualization capability. This will be used to support nested virtualization in KVM. Signed-off-by: Jintack Lim Signed-off-by: Andre Przywara Signed-off-by: Christoffer Dall Signed-off-by: Marc Zyngier --- .../admin-guide/kernel-parameters.txt | 4 +++ arch/arm64/include/asm/cpucaps.h | 1 + arch/arm64/kernel/cpufeature.c | 25 +++++++++++++++++++ 3 files changed, 30 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index ee9f13776388..727e49640124 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -2285,6 +2285,10 @@ [KVM,ARM] Allow use of GICv4 for direct injection of LPIs. + kvm-arm.nested= + [KVM,ARM] Allow nested virtualization in KVM/ARM. + Default is 0 (disabled) + kvm_cma_resv_ratio=n [PPC] Reserves given percentage from system memory area for contiguous memory allocation for KVM hash pagetable diff --git a/arch/arm64/include/asm/cpucaps.h b/arch/arm64/include/asm/cpucaps.h index b77d997b173b..6c5b84692a01 100644 --- a/arch/arm64/include/asm/cpucaps.h +++ b/arch/arm64/include/asm/cpucaps.h @@ -16,6 +16,7 @@ #define ARM64_WORKAROUND_CAVIUM_23154 6 #define ARM64_WORKAROUND_834220 7 #define ARM64_HAS_NO_HW_PREFETCH 8 +#define ARM64_HAS_NESTED_VIRT 9 #define ARM64_HAS_VIRT_HOST_EXTN 11 #define ARM64_WORKAROUND_CAVIUM_27456 12 #define ARM64_HAS_32BIT_EL0 13 diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index d96f4554282d..eaeea8a88292 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -1577,6 +1577,21 @@ static void cpu_copy_el2regs(const struct arm64_cpu_capabilities *__unused) if (!alternative_is_applied(ARM64_HAS_VIRT_HOST_EXTN)) write_sysreg(read_sysreg(tpidr_el1), tpidr_el2); } + +static bool nested_param; +static bool has_nested_virt_support(const struct arm64_cpu_capabilities *cap, + int scope) +{ + return has_cpuid_feature(cap, scope) && + nested_param; +} + +static int __init kvmarm_nested_cfg(char *buf) +{ + return strtobool(buf, &nested_param); +} + +early_param("kvm-arm.nested", kvmarm_nested_cfg); #endif static void cpu_has_fwb(const struct arm64_cpu_capabilities *__unused) @@ -1790,6 +1805,16 @@ static const struct arm64_cpu_capabilities arm64_features[] = { .matches = runs_at_el2, .cpu_enable = cpu_copy_el2regs, }, + { + .desc = "Nested Virtualization Support", + .capability = ARM64_HAS_NESTED_VIRT, + .type = ARM64_CPUCAP_SYSTEM_FEATURE, + .matches = has_nested_virt_support, + .sys_reg = SYS_ID_AA64MMFR2_EL1, + .sign = FTR_UNSIGNED, + .field_pos = ID_AA64MMFR2_NV_SHIFT, + .min_field_value = 1, + }, #endif /* CONFIG_ARM64_VHE */ { .desc = "32-bit EL0 Support", -- 2.29.2 _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm