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Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sazwr-0000000GNPI-2vvF; Mon, 05 Aug 2024 15:48:37 +0000 Received: from linux.microsoft.com ([13.77.154.182]) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sazwM-0000000GNH4-0ee1 for linux-arm-kernel@lists.infradead.org; Mon, 05 Aug 2024 15:48:07 +0000 Received: from [10.137.186.190] (unknown [131.107.159.62]) by linux.microsoft.com (Postfix) with ESMTPSA id 4D13F20B7165; Mon, 5 Aug 2024 08:48:05 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 4D13F20B7165 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1722872885; bh=p7toEQ4WVgn+rpngX9Asp3BsE6OVAl2aKHQzLgHYJdg=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=JOD4+NZ4u6Qof2mU1JFWoNIuhg3QLEMcsDFI+aKaqp2IxjepJd5DjWdlpYqvgGef8 q5Syu63/Cb3JwqIPVQTMsUIQ8l3zwEYir7g+4ArDTf5RVaMwbBKPPFkdV5SO0Z0ooN ux+ezoY2PtRNJW/iy7ijXvnOyzfxGLos4Y3fph58= Message-ID: <97749cb2-35cb-4b54-a5c9-6cf3147c0cdd@linux.microsoft.com> Date: Mon, 5 Aug 2024 08:48:05 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 4/7] arm64: hyperv: Boot in a Virtual Trust Level To: Saurabh Singh Sengar Cc: arnd@arndb.de, bhelgaas@google.com, bp@alien8.de, catalin.marinas@arm.com, dave.hansen@linux.intel.com, decui@microsoft.com, haiyangz@microsoft.com, hpa@zytor.com, kw@linux.com, kys@microsoft.com, lenb@kernel.org, lpieralisi@kernel.org, mingo@redhat.com, rafael@kernel.org, robh@kernel.org, tglx@linutronix.de, wei.liu@kernel.org, will@kernel.org, linux-acpi@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, x86@kernel.org, apais@microsoft.com, benhill@microsoft.com, ssengar@microsoft.com, sunilmut@microsoft.com, vdso@hexbites.dev References: <20240726225910.1912537-1-romank@linux.microsoft.com> <20240726225910.1912537-5-romank@linux.microsoft.com> <20240805062821.GA31897@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net> Content-Language: en-US From: Roman Kisel In-Reply-To: <20240805062821.GA31897@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240805_084806_431472_D36EA629 X-CRM114-Status: GOOD ( 19.64 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 8/4/2024 11:28 PM, Saurabh Singh Sengar wrote: > On Fri, Jul 26, 2024 at 03:59:07PM -0700, Roman Kisel wrote: >> To run in the VTL mode, Hyper-V drivers have to know what >> VTL the system boots in, and the arm64/hyperv code does not >> update the variable that stores the value. >> >> Update the variable to enable the Hyper-V drivers to boot >> in the VTL mode and print the VTL the code runs in. >> >> Signed-off-by: Roman Kisel >> --- >> arch/arm64/hyperv/Makefile | 1 + >> arch/arm64/hyperv/hv_vtl.c | 13 +++++++++++++ >> arch/arm64/hyperv/mshyperv.c | 4 ++++ >> arch/arm64/include/asm/mshyperv.h | 7 +++++++ >> 4 files changed, 25 insertions(+) >> create mode 100644 arch/arm64/hyperv/hv_vtl.c >> >> diff --git a/arch/arm64/hyperv/Makefile b/arch/arm64/hyperv/Makefile >> index 87c31c001da9..9701a837a6e1 100644 >> --- a/arch/arm64/hyperv/Makefile >> +++ b/arch/arm64/hyperv/Makefile >> @@ -1,2 +1,3 @@ >> # SPDX-License-Identifier: GPL-2.0 >> obj-y := hv_core.o mshyperv.o >> +obj-$(CONFIG_HYPERV_VTL_MODE) += hv_vtl.o >> diff --git a/arch/arm64/hyperv/hv_vtl.c b/arch/arm64/hyperv/hv_vtl.c >> new file mode 100644 >> index 000000000000..38642b7b6be0 >> --- /dev/null >> +++ b/arch/arm64/hyperv/hv_vtl.c >> @@ -0,0 +1,13 @@ >> +// SPDX-License-Identifier: GPL-2.0 >> +/* >> + * Copyright (C) 2024, Microsoft, Inc. >> + * >> + * Author : Roman Kisel >> + */ >> + >> +#include >> + >> +void __init hv_vtl_init_platform(void) >> +{ >> + pr_info("Linux runs in Hyper-V Virtual Trust Level\n"); >> +} >> diff --git a/arch/arm64/hyperv/mshyperv.c b/arch/arm64/hyperv/mshyperv.c >> index 341f98312667..8fd04d6e4800 100644 >> --- a/arch/arm64/hyperv/mshyperv.c >> +++ b/arch/arm64/hyperv/mshyperv.c >> @@ -98,6 +98,10 @@ static int __init hyperv_init(void) >> return ret; >> } >> >> + /* Find the VTL */ >> + ms_hyperv.vtl = get_vtl(); >> + hv_vtl_init_platform(); >> + >> ms_hyperv_late_init(); >> >> hyperv_initialized = true; >> diff --git a/arch/arm64/include/asm/mshyperv.h b/arch/arm64/include/asm/mshyperv.h >> index a7a3586f7cb1..63d6bb6998fc 100644 >> --- a/arch/arm64/include/asm/mshyperv.h >> +++ b/arch/arm64/include/asm/mshyperv.h >> @@ -49,6 +49,13 @@ static inline u64 hv_get_msr(unsigned int reg) >> ARM_SMCCC_OWNER_VENDOR_HYP, \ >> HV_SMCCC_FUNC_NUMBER) >> >> +#ifdef CONFIG_HYPERV_VTL_MODE >> +void __init hv_vtl_init_platform(void); >> +int __init hv_vtl_early_init(void); >> +#else >> +static inline void __init hv_vtl_init_platform(void) {} >> +#endif >> + > > These functions are defined in x86 header as well. We can move it to generic header. > Will do, thanks! > - Saurabh -- Thank you, Roman