linux-kernel - RE: [PATCH v2 6/9] x86/hyperv: Introduce a global variable hyperv_paravisor

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Message-ID: <SA1PR21MB133573B4C5E76CA472161DC9BF1CA@SA1PR21MB1335.namprd21.prod.outlook.com>
Date:   Wed, 23 Aug 2023 04:28:19 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     "Michael Kelley (LINUX)" <mikelley@...rosoft.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "arnd@...db.de" <arnd@...db.de>, "bp@...en8.de" <bp@...en8.de>,
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        Haiyang Zhang <haiyangz@...rosoft.com>,
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        KY Srinivasan <kys@...rosoft.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
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CC:     "x86@...nel.org" <x86@...nel.org>,
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Subject: RE: [PATCH v2 6/9] x86/hyperv: Introduce a global variable
 hyperv_paravisor_present

> From: Dexuan Cui
> Sent: Tuesday, August 22, 2023 9:24 PM
> To: Michael Kelley (LINUX) <mikelley@...rosoft.com>; ak@...ux.intel.com;
>  [...]
> BTW, please refer to the link for the v3 version of this patch (WIP):

I forgot to share the link in my last email... Here it is:
https://github.com/dcui/tdx/commit/3e2a28d5cf1031679bf2e2ac37eb1fd02afc8d44

> [...]
> > > --- a/drivers/hv/connection.c
> > > +++ b/drivers/hv/connection.c
> > > @@ -484,7 +484,7 @@ void vmbus_set_event(struct vmbus_channel
> > *channel)
> > >
> > >  	++channel->sig_events;
> > >
> > > -	if (hv_isolation_type_snp())
> > > +	if (hv_isolation_type_snp() && hyperv_paravisor_present)
> >
> > This code change seems to be more properly part of Patch 9 in the
> > series when hv_isolation_type_en_snp() goes away.
> 
> The change here is part of the efforts to correctly support hypercalls for
> a TDX VM with the paravisor. Patch 9 is just a clean-up patch, which is
> not really required for a TDX VM (with or with the paravisor) to run on
> Hyper-V, so IMO it's better to keep the change here in this patch.
> 
> BTW, please refer to the link for the v3 version of this patch (WIP):

https://github.com/dcui/tdx/commit/3e2a28d5cf1031679bf2e2ac37eb1fd02afc8d44
(the same link as the above one)