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Wed, 21 Jul 2021 10:57:25 -0400 (EDT) Date: Wed, 21 Jul 2021 22:55:26 +0800 From: Boqun Feng To: Michael Kelley Cc: will@kernel.org, catalin.marinas@arm.com, mark.rutland@arm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-efi@vger.kernel.org, wei.liu@kernel.org, kys@microsoft.com, sthemmin@microsoft.com, ardb@kernel.org Subject: Re: [PATCH v11 3/5] arm64: hyperv: Initialize hypervisor on boot Message-ID: References: <1626793023-13830-1-git-send-email-mikelley@microsoft.com> <1626793023-13830-4-git-send-email-mikelley@microsoft.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1626793023-13830-4-git-send-email-mikelley@microsoft.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jul 20, 2021 at 07:57:01AM -0700, Michael Kelley wrote: > Add ARM64-specific code to initialize the Hyper-V > hypervisor when booting as a guest VM. > > This code is built only when CONFIG_HYPERV is enabled. > > Signed-off-by: Michael Kelley FWIW, Reviewed-by: Boqun Feng Regards, Boqun > --- > arch/arm64/hyperv/Makefile | 2 +- > arch/arm64/hyperv/mshyperv.c | 83 ++++++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 84 insertions(+), 1 deletion(-) > create mode 100644 arch/arm64/hyperv/mshyperv.c > > diff --git a/arch/arm64/hyperv/Makefile b/arch/arm64/hyperv/Makefile > index 1697d30..87c31c0 100644 > --- a/arch/arm64/hyperv/Makefile > +++ b/arch/arm64/hyperv/Makefile > @@ -1,2 +1,2 @@ > # SPDX-License-Identifier: GPL-2.0 > -obj-y := hv_core.o > +obj-y := hv_core.o mshyperv.o > diff --git a/arch/arm64/hyperv/mshyperv.c b/arch/arm64/hyperv/mshyperv.c > new file mode 100644 > index 0000000..2811fd0 > --- /dev/null > +++ b/arch/arm64/hyperv/mshyperv.c > @@ -0,0 +1,83 @@ > +// SPDX-License-Identifier: GPL-2.0 > + > +/* > + * Core routines for interacting with Microsoft's Hyper-V hypervisor, > + * including hypervisor initialization. > + * > + * Copyright (C) 2021, Microsoft, Inc. > + * > + * Author : Michael Kelley > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +static bool hyperv_initialized; > + > +static int __init hyperv_init(void) > +{ > + struct hv_get_vp_registers_output result; > + u32 a, b, c, d; > + u64 guest_id; > + int ret; > + > + /* > + * If we're in a VM on Hyper-V, the ACPI hypervisor_id field will > + * have the string "MsHyperV". > + */ > + if (strncmp((char *)&acpi_gbl_FADT.hypervisor_id, "MsHyperV", 8)) > + return -EINVAL; > + > + /* Setup the guest ID */ > + guest_id = generate_guest_id(0, LINUX_VERSION_CODE, 0); > + hv_set_vpreg(HV_REGISTER_GUEST_OSID, guest_id); > + > + /* Get the features and hints from Hyper-V */ > + hv_get_vpreg_128(HV_REGISTER_FEATURES, &result); > + ms_hyperv.features = result.as32.a; > + ms_hyperv.priv_high = result.as32.b; > + ms_hyperv.misc_features = result.as32.c; > + > + hv_get_vpreg_128(HV_REGISTER_ENLIGHTENMENTS, &result); > + ms_hyperv.hints = result.as32.a; > + > + pr_info("Hyper-V: privilege flags low 0x%x, high 0x%x, hints 0x%x, misc 0x%x\n", > + ms_hyperv.features, ms_hyperv.priv_high, ms_hyperv.hints, > + ms_hyperv.misc_features); > + > + /* Get information about the Hyper-V host version */ > + hv_get_vpreg_128(HV_REGISTER_HYPERVISOR_VERSION, &result); > + a = result.as32.a; > + b = result.as32.b; > + c = result.as32.c; > + d = result.as32.d; > + pr_info("Hyper-V: Host Build %d.%d.%d.%d-%d-%d\n", > + b >> 16, b & 0xFFFF, a, d & 0xFFFFFF, c, d >> 24); > + > + ret = hv_common_init(); > + if (ret) > + return ret; > + > + ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "arm64/hyperv_init:online", > + hv_common_cpu_init, hv_common_cpu_die); > + if (ret < 0) { > + hv_common_free(); > + return ret; > + } > + > + hyperv_initialized = true; > + return 0; > +} > + > +early_initcall(hyperv_init); > + > +bool hv_is_hyperv_initialized(void) > +{ > + return hyperv_initialized; > +} > +EXPORT_SYMBOL_GPL(hv_is_hyperv_initialized); > -- > 1.8.3.1 > 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=-10.8 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 BF5A7C12002 for ; 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Wed, 21 Jul 2021 10:57:25 -0400 (EDT) Date: Wed, 21 Jul 2021 22:55:26 +0800 From: Boqun Feng To: Michael Kelley Cc: will@kernel.org, catalin.marinas@arm.com, mark.rutland@arm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-efi@vger.kernel.org, wei.liu@kernel.org, kys@microsoft.com, sthemmin@microsoft.com, ardb@kernel.org Subject: Re: [PATCH v11 3/5] arm64: hyperv: Initialize hypervisor on boot Message-ID: References: <1626793023-13830-1-git-send-email-mikelley@microsoft.com> <1626793023-13830-4-git-send-email-mikelley@microsoft.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1626793023-13830-4-git-send-email-mikelley@microsoft.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210721_075728_478303_C67BADF4 X-CRM114-Status: GOOD ( 26.44 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Jul 20, 2021 at 07:57:01AM -0700, Michael Kelley wrote: > Add ARM64-specific code to initialize the Hyper-V > hypervisor when booting as a guest VM. > > This code is built only when CONFIG_HYPERV is enabled. > > Signed-off-by: Michael Kelley FWIW, Reviewed-by: Boqun Feng Regards, Boqun > --- > arch/arm64/hyperv/Makefile | 2 +- > arch/arm64/hyperv/mshyperv.c | 83 ++++++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 84 insertions(+), 1 deletion(-) > create mode 100644 arch/arm64/hyperv/mshyperv.c > > diff --git a/arch/arm64/hyperv/Makefile b/arch/arm64/hyperv/Makefile > index 1697d30..87c31c0 100644 > --- a/arch/arm64/hyperv/Makefile > +++ b/arch/arm64/hyperv/Makefile > @@ -1,2 +1,2 @@ > # SPDX-License-Identifier: GPL-2.0 > -obj-y := hv_core.o > +obj-y := hv_core.o mshyperv.o > diff --git a/arch/arm64/hyperv/mshyperv.c b/arch/arm64/hyperv/mshyperv.c > new file mode 100644 > index 0000000..2811fd0 > --- /dev/null > +++ b/arch/arm64/hyperv/mshyperv.c > @@ -0,0 +1,83 @@ > +// SPDX-License-Identifier: GPL-2.0 > + > +/* > + * Core routines for interacting with Microsoft's Hyper-V hypervisor, > + * including hypervisor initialization. > + * > + * Copyright (C) 2021, Microsoft, Inc. > + * > + * Author : Michael Kelley > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +static bool hyperv_initialized; > + > +static int __init hyperv_init(void) > +{ > + struct hv_get_vp_registers_output result; > + u32 a, b, c, d; > + u64 guest_id; > + int ret; > + > + /* > + * If we're in a VM on Hyper-V, the ACPI hypervisor_id field will > + * have the string "MsHyperV". > + */ > + if (strncmp((char *)&acpi_gbl_FADT.hypervisor_id, "MsHyperV", 8)) > + return -EINVAL; > + > + /* Setup the guest ID */ > + guest_id = generate_guest_id(0, LINUX_VERSION_CODE, 0); > + hv_set_vpreg(HV_REGISTER_GUEST_OSID, guest_id); > + > + /* Get the features and hints from Hyper-V */ > + hv_get_vpreg_128(HV_REGISTER_FEATURES, &result); > + ms_hyperv.features = result.as32.a; > + ms_hyperv.priv_high = result.as32.b; > + ms_hyperv.misc_features = result.as32.c; > + > + hv_get_vpreg_128(HV_REGISTER_ENLIGHTENMENTS, &result); > + ms_hyperv.hints = result.as32.a; > + > + pr_info("Hyper-V: privilege flags low 0x%x, high 0x%x, hints 0x%x, misc 0x%x\n", > + ms_hyperv.features, ms_hyperv.priv_high, ms_hyperv.hints, > + ms_hyperv.misc_features); > + > + /* Get information about the Hyper-V host version */ > + hv_get_vpreg_128(HV_REGISTER_HYPERVISOR_VERSION, &result); > + a = result.as32.a; > + b = result.as32.b; > + c = result.as32.c; > + d = result.as32.d; > + pr_info("Hyper-V: Host Build %d.%d.%d.%d-%d-%d\n", > + b >> 16, b & 0xFFFF, a, d & 0xFFFFFF, c, d >> 24); > + > + ret = hv_common_init(); > + if (ret) > + return ret; > + > + ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "arm64/hyperv_init:online", > + hv_common_cpu_init, hv_common_cpu_die); > + if (ret < 0) { > + hv_common_free(); > + return ret; > + } > + > + hyperv_initialized = true; > + return 0; > +} > + > +early_initcall(hyperv_init); > + > +bool hv_is_hyperv_initialized(void) > +{ > + return hyperv_initialized; > +} > +EXPORT_SYMBOL_GPL(hv_is_hyperv_initialized); > -- > 1.8.3.1 > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel