linux-kernel - RE: [PATCH V3] x86/Hyper-V: Add SEV negotiate protocol support in Isolation VM

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Message-ID: <PH0PR21MB30252886961F6D7EA7B7EBE6D7AA9@PH0PR21MB3025.namprd21.prod.outlook.com>
Date:   Tue, 14 Jun 2022 16:50:36 +0000
From:   "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
To:     Tianyu Lan <ltykernel@...il.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        Dexuan Cui <decui@...rosoft.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>
CC:     Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        vkuznets <vkuznets@...hat.com>,
        "parri.andrea@...il.com" <parri.andrea@...il.com>,
        "thomas.lendacky@....com" <thomas.lendacky@....com>
Subject: RE: [PATCH V3] x86/Hyper-V: Add SEV negotiate protocol support in
 Isolation VM

From: Tianyu Lan <ltykernel@...il.com> Sent: Monday, June 13, 2022 6:46 PM
> 
> Hyper-V Isolation VM current code uses sev_es_ghcb_hv_call()
> to read/write MSR via GHCB page and depends on the sev code.
> This may cause regression when sev code changes interface
> design.
> 
> The latest SEV-ES code requires to negotiate GHCB version before
> reading/writing MSR via GHCB page and sev_es_ghcb_hv_call() doesn't
> work for Hyper-V Isolation VM. Add Hyper-V ghcb related implementation
> to decouple SEV and Hyper-V code. Negotiate GHCB version in the
> hyperv_init() and use the version to communicate with Hyper-V
> in the ghcb hv call function.
> 
> Fixes: 2ea29c5abbc2 ("x86/sev: Save the negotiated GHCB version")
> Signed-off-by: Tianyu Lan <Tianyu.Lan@...rosoft.com>
> ---
> Change since v1:
>        - Negotiate ghcb version in Hyper-V init.
>        - use native_wrmsrl() instead of native_wrmsr() in the
>        	 wr_ghcb_msr().
> ---
>  arch/x86/hyperv/hv_init.c       |  6 +++
>  arch/x86/hyperv/ivm.c           | 84 ++++++++++++++++++++++++++++++---
>  arch/x86/include/asm/mshyperv.h |  4 ++
>  3 files changed, 88 insertions(+), 6 deletions(-)
> 

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