From nobody Wed Sep 10 02:39:11 2025 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 28C33E728D7 for ; Fri, 29 Sep 2023 18:02:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233843AbjI2SCX (ORCPT ); Fri, 29 Sep 2023 14:02:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56264 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233818AbjI2SCG (ORCPT ); Fri, 29 Sep 2023 14:02:06 -0400 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 7224ECC3; Fri, 29 Sep 2023 11:01:57 -0700 (PDT) Received: from linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net (linux.microsoft.com [13.77.154.182]) by linux.microsoft.com (Postfix) with ESMTPSA id 7B99420B74C4; Fri, 29 Sep 2023 11:01:56 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 7B99420B74C4 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1696010516; bh=/7m+y8jCPpzPX/lKoISXVPs2wgZhEYzypUg762MOLQ4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pSsvhPR7/qyaL67JMveYeSAuUeHhFMzs9Vf1cjwydXBUyiRjs+AnatVUCokAYomRA Eqljn3TmtoPzmJkEz46RKZ+DEnp4k2DoOp1dLUZunEjSbukuLwjE3DeRpJh2ACvFjl Jj1giraKEJfWvBwafjRmYxqEQaC38ALuDr6FAKYg= From: Nuno Das Neves To: linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-arch@vger.kernel.org Cc: patches@lists.linux.dev, mikelley@microsoft.com, kys@microsoft.com, wei.liu@kernel.org, gregkh@linuxfoundation.org, haiyangz@microsoft.com, decui@microsoft.com, apais@linux.microsoft.com, Tianyu.Lan@microsoft.com, ssengar@linux.microsoft.com, mukeshrathor@microsoft.com, stanislav.kinsburskiy@gmail.com, jinankjain@linux.microsoft.com, vkuznets@redhat.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, will@kernel.org, catalin.marinas@arm.com Subject: [PATCH v4 02/15] mshyperv: Introduce hv_get_hypervisor_version function Date: Fri, 29 Sep 2023 11:01:28 -0700 Message-Id: <1696010501-24584-3-git-send-email-nunodasneves@linux.microsoft.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1696010501-24584-1-git-send-email-nunodasneves@linux.microsoft.com> References: <1696010501-24584-1-git-send-email-nunodasneves@linux.microsoft.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" x86_64 and arm64 implementations to get the hypervisor version information. Store these in hv_hypervisor_version_info structure to simplify parsing the fields. Replace the existing parsing when printing the version numbers at boot. Signed-off-by: Nuno Das Neves Acked-by: Wei Liu --- arch/arm64/hyperv/mshyperv.c | 23 +++++++++++++------- arch/x86/kernel/cpu/mshyperv.c | 36 +++++++++++++++++++------------ include/asm-generic/hyperv-tlfs.h | 23 ++++++++++++++++++++ include/asm-generic/mshyperv.h | 2 ++ 4 files changed, 62 insertions(+), 22 deletions(-) diff --git a/arch/arm64/hyperv/mshyperv.c b/arch/arm64/hyperv/mshyperv.c index f1b8a04ee9f2..53bdd3bc81ac 100644 --- a/arch/arm64/hyperv/mshyperv.c +++ b/arch/arm64/hyperv/mshyperv.c @@ -19,10 +19,19 @@ =20 static bool hyperv_initialized; =20 +int hv_get_hypervisor_version(union hv_hypervisor_version_info *info) +{ + hv_get_vpreg_128(HV_REGISTER_HYPERVISOR_VERSION, + (struct hv_get_vp_registers_output *)info); + + return 0; +} +EXPORT_SYMBOL_GPL(hv_get_hypervisor_version); + static int __init hyperv_init(void) { - struct hv_get_vp_registers_output result; - u32 a, b, c, d; + struct hv_get_vp_registers_output result; + union hv_hypervisor_version_info version; u64 guest_id; int ret; =20 @@ -55,13 +64,11 @@ static int __init hyperv_init(void) ms_hyperv.misc_features); =20 /* Get information about the Hyper-V host version */ - hv_get_vpreg_128(HV_REGISTER_HYPERVISOR_VERSION, &result); - a =3D result.as32.a; - b =3D result.as32.b; - c =3D result.as32.c; - d =3D result.as32.d; + hv_get_hypervisor_version(&version); pr_info("Hyper-V: Host Build %d.%d.%d.%d-%d-%d\n", - b >> 16, b & 0xFFFF, a, d & 0xFFFFFF, c, d >> 24); + version.major_version, version.minor_version, + version.build_number, version.service_number, + version.service_pack, version.service_branch); =20 ret =3D hv_common_init(); if (ret) diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index d85a8e2a10c9..9b898b65a013 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -347,13 +347,26 @@ static void __init reduced_hw_init(void) x86_init.irqs.pre_vector_init =3D x86_init_noop; } =20 +int hv_get_hypervisor_version(union hv_hypervisor_version_info *info) +{ + unsigned int hv_max_functions; + + hv_max_functions =3D cpuid_eax(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS); + if (hv_max_functions < HYPERV_CPUID_VERSION) { + pr_err("%s: Could not detect Hyper-V version\n", __func__); + return -ENODEV; + } + + cpuid(HYPERV_CPUID_VERSION, &info->eax, &info->ebx, &info->ecx, &info->ed= x); + + return 0; +} +EXPORT_SYMBOL_GPL(hv_get_hypervisor_version); + static void __init ms_hyperv_init_platform(void) { int hv_max_functions_eax; - int hv_host_info_eax; - int hv_host_info_ebx; - int hv_host_info_ecx; - int hv_host_info_edx; + union hv_hypervisor_version_info version; =20 #ifdef CONFIG_PARAVIRT pv_info.name =3D "Hyper-V"; @@ -407,16 +420,11 @@ static void __init ms_hyperv_init_platform(void) /* * Extract host information. */ - if (hv_max_functions_eax >=3D HYPERV_CPUID_VERSION) { - hv_host_info_eax =3D cpuid_eax(HYPERV_CPUID_VERSION); - hv_host_info_ebx =3D cpuid_ebx(HYPERV_CPUID_VERSION); - hv_host_info_ecx =3D cpuid_ecx(HYPERV_CPUID_VERSION); - hv_host_info_edx =3D cpuid_edx(HYPERV_CPUID_VERSION); - - pr_info("Hyper-V: Host Build %d.%d.%d.%d-%d-%d\n", - hv_host_info_ebx >> 16, hv_host_info_ebx & 0xFFFF, - hv_host_info_eax, hv_host_info_edx & 0xFFFFFF, - hv_host_info_ecx, hv_host_info_edx >> 24); + if (hv_get_hypervisor_version(&version) =3D=3D 0) { + pr_info("Hyper-V Host Build:%d-%d.%d-%d-%d.%d\n", + version.build_number, version.major_version, + version.minor_version, version.service_pack, + version.service_branch, version.service_number); } =20 if (ms_hyperv.features & HV_ACCESS_FREQUENCY_MSRS && diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv= -tlfs.h index fdac4a1714ec..f63b3704d89e 100644 --- a/include/asm-generic/hyperv-tlfs.h +++ b/include/asm-generic/hyperv-tlfs.h @@ -787,6 +787,29 @@ struct hv_input_unmap_device_interrupt { #define HV_SOURCE_SHADOW_NONE 0x0 #define HV_SOURCE_SHADOW_BRIDGE_BUS_RANGE 0x1 =20 +/* + * Version info reported by hypervisor + */ +union hv_hypervisor_version_info { + struct { + u32 build_number; + + u32 minor_version : 16; + u32 major_version : 16; + + u32 service_pack; + + u32 service_number : 24; + u32 service_branch : 8; + }; + struct { + u32 eax; + u32 ebx; + u32 ecx; + u32 edx; + }; +}; + /* * The whole argument should fit in a page to be able to pass to the hyper= visor * in one hypercall. diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h index 56f4a447a178..9f2c06c9d5d1 100644 --- a/include/asm-generic/mshyperv.h +++ b/include/asm-generic/mshyperv.h @@ -161,6 +161,8 @@ static inline void vmbus_signal_eom(struct hv_message *= msg, u32 old_msg_type) } } =20 +int hv_get_hypervisor_version(union hv_hypervisor_version_info *info); + void hv_setup_vmbus_handler(void (*handler)(void)); void hv_remove_vmbus_handler(void); void hv_setup_stimer0_handler(void (*handler)(void)); --=20 2.25.1