linux-kernel - RE: [PATCH v4 5/5] x86/hyperv: VTL support for Hyper-V

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Message-ID: <BYAPR21MB1688B6A7BA3FCEE36C746C06D7969@BYAPR21MB1688.namprd21.prod.outlook.com>
Date:   Fri, 7 Apr 2023 16:00:23 +0000
From:   "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
To:     Saurabh Sengar <ssengar@...ux.microsoft.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        Dexuan Cui <decui@...rosoft.com>,
        "arnd@...db.de" <arnd@...db.de>,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "jgross@...e.com" <jgross@...e.com>,
        "mat.jonczyk@...pl" <mat.jonczyk@...pl>
Subject: RE: [PATCH v4 5/5] x86/hyperv: VTL support for Hyper-V

From: Saurabh Sengar <ssengar@...ux.microsoft.com> Sent: Tuesday, April 4, 2023 2:01 AM
> 
> Virtual Trust Levels (VTL) helps enable Hyper-V Virtual Secure Mode (VSM)
> feature. VSM is a set of hypervisor capabilities and enlightenments
> offered to host and guest partitions which enable the creation and
> management of new security boundaries within operating system software.
> VSM achieves and maintains isolation through VTLs.
> 
> Add early initialization for Virtual Trust Levels (VTL). This includes
> initializing the x86 platform for VTL and enabling boot support for
> secondary CPUs to start in targeted VTL context. For now, only enable
> the code for targeted VTL level as 2.
> 
> When starting an AP at a VTL other than VTL0, the AP must start directly
> in 64-bit mode, bypassing the usual 16-bit -> 32-bit -> 64-bit mode
> transition sequence that occurs after waking up an AP with SIPI whose
> vector points to the 16-bit AP startup trampoline code.
> 
> Signed-off-by: Saurabh Sengar <ssengar@...ux.microsoft.com>
> ---
> [V4]
> - replace initial_stack with current->thread.sp as per recent upstream changes
> 
>  arch/x86/hyperv/Makefile        |   1 +
>  arch/x86/hyperv/hv_vtl.c        | 227 ++++++++++++++++++++++++++++++++
>  arch/x86/include/asm/mshyperv.h |  10 ++
>  arch/x86/kernel/cpu/mshyperv.c  |   1 +
>  4 files changed, 239 insertions(+)
>  create mode 100644 arch/x86/hyperv/hv_vtl.c
> 

Reviewed-by: Michael Kelley <mikelley@...rosoft.com>