From patchwork Mon Apr 28 21:07:37 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roman Kisel X-Patchwork-Id: 885775 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 12C9420E000; Mon, 28 Apr 2025 21:07:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.77.154.182 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745874469; cv=none; b=CjZzUg1AYIAbBk6IIhbKD5FYeoc0zuqW9/q8DCEHJrOZUWo7elzhZOcjDo/Wf25JFcnXPsoylRx81wFCXB63a8NdUHrC2kx+i89tQC/8mBvjGf5M0BYmEJAD3I8j/vMeWXMYevm/vMU5UAQrTSPBrt6flTGCKNkpcFAcM5lfb1Y= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745874469; c=relaxed/simple; bh=I3CEwKjiOw/f7nFmYsNkksTJaqqOcfPtnDq3c6iskUw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=YWY/qLeqJ0ehT+7GKuam7OhLluRFR/W4SyV2tj2f4rc1gMTTUmlbx9OmaaClfBSY7mIsesurYnyQWb5hZBnMfQGos+a1pICuUfcIlaOK3asWc2HEpeSyxydRr8Z/KF1T/dKGAalzGtAlnZppDY5oEjA0EO1DzeAZdicqKvClxH8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com; spf=pass smtp.mailfrom=linux.microsoft.com; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b=ILeQxzGc; arc=none smtp.client-ip=13.77.154.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="ILeQxzGc" Received: from romank-3650.corp.microsoft.com (unknown [131.107.1.188]) by linux.microsoft.com (Postfix) with ESMTPSA id 06B0A211AD28; Mon, 28 Apr 2025 14:07:46 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 06B0A211AD28 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1745874466; bh=xt1rbRXU40eBeYFqn5S5410daeID7AsrUbw+WPHynno=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ILeQxzGcrqOI4PpdKoj7u5guh0X0UX9/VyUrwB0JxYD13NsGVGsLZHHEMhXrkz1XI T1m7CheHstc2Y2+zmY8+VfPt0ye9i1Hv2lytSJggpw039jJ4ClPFk/GxeLHaKmFhPC X8uoP1iwndOfYCt6dIZggjhIHT+M1l89I3vcvyzU= From: Roman Kisel To: arnd@arndb.de, bhelgaas@google.com, bp@alien8.de, catalin.marinas@arm.com, conor+dt@kernel.org, dave.hansen@linux.intel.com, decui@microsoft.com, haiyangz@microsoft.com, hpa@zytor.com, joey.gouly@arm.com, krzk+dt@kernel.org, kw@linux.com, kys@microsoft.com, lenb@kernel.org, lpieralisi@kernel.org, manivannan.sadhasivam@linaro.org, mark.rutland@arm.com, maz@kernel.org, mingo@redhat.com, oliver.upton@linux.dev, rafael@kernel.org, robh@kernel.org, ssengar@linux.microsoft.com, sudeep.holla@arm.com, suzuki.poulose@arm.com, tglx@linutronix.de, wei.liu@kernel.org, will@kernel.org, yuzenghui@huawei.com, linux-hyperv@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, linux-arch@vger.kernel.org, x86@kernel.org Cc: apais@microsoft.com, benhill@microsoft.com, bperkins@microsoft.com, sunilmut@microsoft.com Subject: [PATCH hyperv-next v9 06/11] arm64, x86: hyperv: Report the VTL the system boots in Date: Mon, 28 Apr 2025 14:07:37 -0700 Message-ID: <20250428210742.435282-7-romank@linux.microsoft.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250428210742.435282-1-romank@linux.microsoft.com> References: <20250428210742.435282-1-romank@linux.microsoft.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The hyperv guest code might run in various Virtual Trust Levels. Report the level when the kernel boots in the non-default (0) one. Signed-off-by: Roman Kisel Reviewed-by: Michael Kelley --- arch/arm64/hyperv/mshyperv.c | 2 ++ arch/x86/hyperv/hv_vtl.c | 7 ++++++- 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/arch/arm64/hyperv/mshyperv.c b/arch/arm64/hyperv/mshyperv.c index 43f422a7ef34..4fdc26ade1d7 100644 --- a/arch/arm64/hyperv/mshyperv.c +++ b/arch/arm64/hyperv/mshyperv.c @@ -118,6 +118,8 @@ static int __init hyperv_init(void) if (ms_hyperv.priv_high & HV_ACCESS_PARTITION_ID) hv_get_partition_id(); ms_hyperv.vtl = get_vtl(); + if (ms_hyperv.vtl > 0) /* non default VTL */ + pr_info("Linux runs in Hyper-V Virtual Trust Level %d\n", ms_hyperv.vtl); ms_hyperv_late_init(); diff --git a/arch/x86/hyperv/hv_vtl.c b/arch/x86/hyperv/hv_vtl.c index 582fe820e29c..038c896fdd60 100644 --- a/arch/x86/hyperv/hv_vtl.c +++ b/arch/x86/hyperv/hv_vtl.c @@ -55,7 +55,12 @@ static void __noreturn hv_vtl_restart(char __maybe_unused *cmd) void __init hv_vtl_init_platform(void) { - pr_info("Linux runs in Hyper-V Virtual Trust Level\n"); + /* + * This function is a no-op if the VTL mode is not enabled. + * If it is, this function runs if and only the kernel boots in + * VTL2 which the x86 hv initialization path makes sure of. + */ + pr_info("Linux runs in Hyper-V Virtual Trust Level %d\n", ms_hyperv.vtl); x86_platform.realmode_reserve = x86_init_noop; x86_platform.realmode_init = x86_init_noop;