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From: Sunil Muthuswamy <sunilmut@microsoft.com>
To: Michael Kelley <mikelley@microsoft.com>,
	"will@kernel.org" <will@kernel.org>,
	"catalin.marinas@arm.com" <catalin.marinas@arm.com>,
	Mark Rutland <Mark.Rutland@arm.com>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
	"linux-efi@vger.kernel.org" <linux-efi@vger.kernel.org>,
	"wei.liu@kernel.org" <wei.liu@kernel.org>,
	KY Srinivasan <kys@microsoft.com>,
	Stephen Hemminger <sthemmin@microsoft.com>,
	"ardb@kernel.org" <ardb@kernel.org>
Cc: Michael Kelley <mikelley@microsoft.com>
Subject: RE: [PATCH v11 3/5] arm64: hyperv: Initialize hypervisor on boot
Date: Tue, 27 Jul 2021 17:05:33 +0000	[thread overview]
Message-ID: <MW4PR21MB200240F67E9572EA5C4F986CC0E99@MW4PR21MB2002.namprd21.prod.outlook.com> (raw)
In-Reply-To: <1626793023-13830-4-git-send-email-mikelley@microsoft.com>

> Subject: [PATCH v11 3/5] arm64: hyperv: Initialize hypervisor on boot
> 
> 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 <mikelley@microsoft.com>
> ---
>  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 <mikelley@microsoft.com>
> + */
> +
> +#include <linux/types.h>
> +#include <linux/acpi.h>
> +#include <linux/export.h>
> +#include <linux/errno.h>
> +#include <linux/version.h>
> +#include <linux/cpuhotplug.h>
> +#include <asm/mshyperv.h>
> +
> +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

Reviewed-by: Sunil Muthuswamy <sunilmut@microsoft.com>

  parent reply	other threads:[~2021-07-27 17:05 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-20 14:56 [PATCH v11 0/5] Enable Linux guests on Hyper-V on ARM64 Michael Kelley
2021-07-20 14:56 ` [PATCH v11 1/5] arm64: hyperv: Add Hyper-V hypercall and register access utilities Michael Kelley
2021-07-20 14:57 ` [PATCH v11 2/5] arm64: hyperv: Add panic handler Michael Kelley
2021-07-21 14:54   ` Boqun Feng
2021-07-27 17:08   ` Sunil Muthuswamy
2021-07-20 14:57 ` [PATCH v11 3/5] arm64: hyperv: Initialize hypervisor on boot Michael Kelley
2021-07-21 14:55   ` Boqun Feng
2021-07-27 17:05   ` Sunil Muthuswamy [this message]
2021-08-02 15:55   ` Marc Zyngier
2021-08-02 16:26   ` Mark Rutland
2021-08-02 17:13     ` Michael Kelley
2021-07-20 14:57 ` [PATCH v11 4/5] arm64: efi: Export screen_info Michael Kelley
2021-07-20 14:57 ` [PATCH v11 5/5] Drivers: hv: Enable Hyper-V code to be built on ARM64 Michael Kelley
2021-07-21 14:52   ` Boqun Feng
2021-08-02 15:15 ` [PATCH v11 0/5] Enable Linux guests on Hyper-V " Michael Kelley
2021-08-02 16:01 ` Marc Zyngier
2021-08-02 16:28   ` Mark Rutland

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